- added ASIO library header files (version 1.4.5, downloaded from

  http://sourceforge.net/projects/asio/files, project page
  http://think-async.com/Asio).
- removed uses of boost::asio
- removed custom TCP/UDP code

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac168@1864 e5f2f494-b856-4b98-b285-d166d9295462

210 files changed, 50715 insertions, 0 deletions

diff --git a/ext/asio.hpp b/ext/asio.hpp
new file mode 100644
index 0000000000..d8acd5859e
--- /dev/null
+++ b/ext/asio.hpp
@@ -0,0 +1,101 @@
+//
+// asio.hpp
+// ~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_HPP
+#define ASIO_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/basic_datagram_socket.hpp"
+#include "asio/basic_deadline_timer.hpp"
+#include "asio/basic_io_object.hpp"
+#include "asio/basic_raw_socket.hpp"
+#include "asio/basic_serial_port.hpp"
+#include "asio/basic_socket_acceptor.hpp"
+#include "asio/basic_socket_iostream.hpp"
+#include "asio/basic_socket_streambuf.hpp"
+#include "asio/basic_stream_socket.hpp"
+#include "asio/basic_streambuf.hpp"
+#include "asio/buffer.hpp"
+#include "asio/buffered_read_stream_fwd.hpp"
+#include "asio/buffered_read_stream.hpp"
+#include "asio/buffered_stream_fwd.hpp"
+#include "asio/buffered_stream.hpp"
+#include "asio/buffered_write_stream_fwd.hpp"
+#include "asio/buffered_write_stream.hpp"
+#include "asio/buffers_iterator.hpp"
+#include "asio/completion_condition.hpp"
+#include "asio/datagram_socket_service.hpp"
+#include "asio/deadline_timer_service.hpp"
+#include "asio/deadline_timer.hpp"
+#include "asio/error.hpp"
+#include "asio/error_code.hpp"
+#include "asio/handler_alloc_hook.hpp"
+#include "asio/handler_invoke_hook.hpp"
+#include "asio/io_service.hpp"
+#include "asio/ip/address.hpp"
+#include "asio/ip/address_v4.hpp"
+#include "asio/ip/address_v6.hpp"
+#include "asio/ip/basic_endpoint.hpp"
+#include "asio/ip/basic_resolver.hpp"
+#include "asio/ip/basic_resolver_entry.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/ip/host_name.hpp"
+#include "asio/ip/icmp.hpp"
+#include "asio/ip/multicast.hpp"
+#include "asio/ip/resolver_query_base.hpp"
+#include "asio/ip/resolver_service.hpp"
+#include "asio/ip/tcp.hpp"
+#include "asio/ip/udp.hpp"
+#include "asio/ip/unicast.hpp"
+#include "asio/ip/v6_only.hpp"
+#include "asio/is_read_buffered.hpp"
+#include "asio/is_write_buffered.hpp"
+#include "asio/local/basic_endpoint.hpp"
+#include "asio/local/connect_pair.hpp"
+#include "asio/local/datagram_protocol.hpp"
+#include "asio/local/stream_protocol.hpp"
+#include "asio/placeholders.hpp"
+#include "asio/posix/basic_descriptor.hpp"
+#include "asio/posix/basic_stream_descriptor.hpp"
+#include "asio/posix/descriptor_base.hpp"
+#include "asio/posix/stream_descriptor.hpp"
+#include "asio/posix/stream_descriptor_service.hpp"
+#include "asio/raw_socket_service.hpp"
+#include "asio/read.hpp"
+#include "asio/read_at.hpp"
+#include "asio/read_until.hpp"
+#include "asio/serial_port.hpp"
+#include "asio/serial_port_base.hpp"
+#include "asio/serial_port_service.hpp"
+#include "asio/socket_acceptor_service.hpp"
+#include "asio/socket_base.hpp"
+#include "asio/strand.hpp"
+#include "asio/stream_socket_service.hpp"
+#include "asio/streambuf.hpp"
+#include "asio/system_error.hpp"
+#include "asio/thread.hpp"
+#include "asio/time_traits.hpp"
+#include "asio/version.hpp"
+#include "asio/windows/basic_handle.hpp"
+#include "asio/windows/basic_random_access_handle.hpp"
+#include "asio/windows/basic_stream_handle.hpp"
+#include "asio/windows/overlapped_ptr.hpp"
+#include "asio/windows/random_access_handle.hpp"
+#include "asio/windows/random_access_handle_service.hpp"
+#include "asio/windows/stream_handle.hpp"
+#include "asio/windows/stream_handle_service.hpp"
+#include "asio/write.hpp"
+#include "asio/write_at.hpp"
+
+#endif // ASIO_HPP
diff --git a/ext/asio/basic_datagram_socket.hpp b/ext/asio/basic_datagram_socket.hpp
new file mode 100644
index 0000000000..cb149f9835
--- /dev/null
+++ b/ext/asio/basic_datagram_socket.hpp
@@ -0,0 +1,803 @@
+//
+// basic_datagram_socket.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_DATAGRAM_SOCKET_HPP
+#define ASIO_BASIC_DATAGRAM_SOCKET_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_socket.hpp"
+#include "asio/datagram_socket_service.hpp"
+#include "asio/error.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+/// Provides datagram-oriented socket functionality.
+/**
+ * The basic_datagram_socket class template provides asynchronous and blocking
+ * datagram-oriented socket functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename Protocol,
+    typename DatagramSocketService = datagram_socket_service<Protocol> >
+class basic_datagram_socket
+  : public basic_socket<Protocol, DatagramSocketService>
+{
+public:
+  /// The native representation of a socket.
+  typedef typename DatagramSocketService::native_type native_type;
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  /// Construct a basic_datagram_socket without opening it.
+  /**
+   * This constructor creates a datagram socket without opening it. The open()
+   * function must be called before data can be sent or received on the socket.
+   *
+   * @param io_service The io_service object that the datagram socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   */
+  explicit basic_datagram_socket(asio::io_service& io_service)
+    : basic_socket<Protocol, DatagramSocketService>(io_service)
+  {
+  }
+
+  /// Construct and open a basic_datagram_socket.
+  /**
+   * This constructor creates and opens a datagram socket.
+   *
+   * @param io_service The io_service object that the datagram socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_datagram_socket(asio::io_service& io_service,
+      const protocol_type& protocol)
+    : basic_socket<Protocol, DatagramSocketService>(io_service, protocol)
+  {
+  }
+
+  /// Construct a basic_datagram_socket, opening it and binding it to the given
+  /// local endpoint.
+  /**
+   * This constructor creates a datagram socket and automatically opens it bound
+   * to the specified endpoint on the local machine. The protocol used is the
+   * protocol associated with the given endpoint.
+   *
+   * @param io_service The io_service object that the datagram socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   *
+   * @param endpoint An endpoint on the local machine to which the datagram
+   * socket will be bound.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_datagram_socket(asio::io_service& io_service,
+      const endpoint_type& endpoint)
+    : basic_socket<Protocol, DatagramSocketService>(io_service, endpoint)
+  {
+  }
+
+  /// Construct a basic_datagram_socket on an existing native socket.
+  /**
+   * This constructor creates a datagram socket object to hold an existing
+   * native socket.
+   *
+   * @param io_service The io_service object that the datagram socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @param native_socket The new underlying socket implementation.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_datagram_socket(asio::io_service& io_service,
+      const protocol_type& protocol, const native_type& native_socket)
+    : basic_socket<Protocol, DatagramSocketService>(
+        io_service, protocol, native_socket)
+  {
+  }
+
+  /// Send some data on a connected socket.
+  /**
+   * This function is used to send data on the datagram socket. The function
+   * call will block until the data has been sent successfully or an error
+   * occurs.
+   *
+   * @param buffers One ore more data buffers to be sent on the socket.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The send operation can only be used with a connected socket. Use
+   * the send_to function to send data on an unconnected datagram socket.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code socket.send(asio::buffer(data, size)); @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send(this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send some data on a connected socket.
+  /**
+   * This function is used to send data on the datagram socket. The function
+   * call will block until the data has been sent successfully or an error
+   * occurs.
+   *
+   * @param buffers One ore more data buffers to be sent on the socket.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The send operation can only be used with a connected socket. Use
+   * the send_to function to send data on an unconnected datagram socket.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send(
+        this->implementation, buffers, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send some data on a connected socket.
+  /**
+   * This function is used to send data on the datagram socket. The function
+   * call will block until the data has been sent successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @note The send operation can only be used with a connected socket. Use
+   * the send_to function to send data on an unconnected datagram socket.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return this->service.send(this->implementation, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous send on a connected socket.
+  /**
+   * This function is used to send data on the datagram socket. The function
+   * call will block until the data has been sent successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket. Although
+   * the buffers object may be copied as necessary, ownership of the underlying
+   * memory blocks is retained by the caller, which must guarantee that they
+   * remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_send operation can only be used with a connected socket.
+   * Use the async_send_to function to send data on an unconnected datagram
+   * socket.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.async_send(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    this->service.async_send(this->implementation, buffers, 0, handler);
+  }
+
+  /// Start an asynchronous send on a connected socket.
+  /**
+   * This function is used to send data on the datagram socket. The function
+   * call will block until the data has been sent successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket. Although
+   * the buffers object may be copied as necessary, ownership of the underlying
+   * memory blocks is retained by the caller, which must guarantee that they
+   * remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_send operation can only be used with a connected socket.
+   * Use the async_send_to function to send data on an unconnected datagram
+   * socket.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    this->service.async_send(this->implementation, buffers, flags, handler);
+  }
+
+  /// Send a datagram to the specified endpoint.
+  /**
+   * This function is used to send a datagram to the specified remote endpoint.
+   * The function call will block until the data has been sent successfully or
+   * an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * asio::ip::udp::endpoint destination(
+   *     asio::ip::address::from_string("1.2.3.4"), 12345);
+   * socket.send_to(asio::buffer(data, size), destination);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send_to(
+        this->implementation, buffers, destination, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send a datagram to the specified endpoint.
+  /**
+   * This function is used to send a datagram to the specified remote endpoint.
+   * The function call will block until the data has been sent successfully or
+   * an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send_to(
+        this->implementation, buffers, destination, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send a datagram to the specified endpoint.
+  /**
+   * This function is used to send a datagram to the specified remote endpoint.
+   * The function call will block until the data has been sent successfully or
+   * an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes sent.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    return this->service.send_to(this->implementation,
+        buffers, destination, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  /**
+   * This function is used to asynchronously send a datagram to the specified
+   * remote endpoint. The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   * Copies will be made of the endpoint as required.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * asio::ip::udp::endpoint destination(
+   *     asio::ip::address::from_string("1.2.3.4"), 12345);
+   * socket.async_send_to(
+   *     asio::buffer(data, size), destination, handler);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, WriteHandler handler)
+  {
+    this->service.async_send_to(this->implementation, buffers, destination, 0,
+        handler);
+  }
+
+  /// Start an asynchronous send.
+  /**
+   * This function is used to asynchronously send a datagram to the specified
+   * remote endpoint. The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   * Copies will be made of the endpoint as required.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags,
+      WriteHandler handler)
+  {
+    this->service.async_send_to(this->implementation, buffers, destination,
+        flags, handler);
+  }
+
+  /// Receive some data on a connected socket.
+  /**
+   * This function is used to receive data on the datagram socket. The function
+   * call will block until data has been received successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The receive operation can only be used with a connected socket. Use
+   * the receive_from function to receive data on an unconnected datagram
+   * socket.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code socket.receive(asio::buffer(data, size)); @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive(
+        this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Receive some data on a connected socket.
+  /**
+   * This function is used to receive data on the datagram socket. The function
+   * call will block until data has been received successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The receive operation can only be used with a connected socket. Use
+   * the receive_from function to receive data on an unconnected datagram
+   * socket.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive(
+        this->implementation, buffers, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Receive some data on a connected socket.
+  /**
+   * This function is used to receive data on the datagram socket. The function
+   * call will block until data has been received successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes received.
+   *
+   * @note The receive operation can only be used with a connected socket. Use
+   * the receive_from function to receive data on an unconnected datagram
+   * socket.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return this->service.receive(this->implementation, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous receive on a connected socket.
+  /**
+   * This function is used to asynchronously receive data from the datagram
+   * socket. The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_receive operation can only be used with a connected socket.
+   * Use the async_receive_from function to receive data on an unconnected
+   * datagram socket.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * socket.async_receive(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    this->service.async_receive(this->implementation, buffers, 0, handler);
+  }
+
+  /// Start an asynchronous receive on a connected socket.
+  /**
+   * This function is used to asynchronously receive data from the datagram
+   * socket. The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_receive operation can only be used with a connected socket.
+   * Use the async_receive_from function to receive data on an unconnected
+   * datagram socket.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    this->service.async_receive(this->implementation, buffers, flags, handler);
+  }
+
+  /// Receive a datagram with the endpoint of the sender.
+  /**
+   * This function is used to receive a datagram. The function call will block
+   * until data has been received successfully or an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the datagram.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * asio::ip::udp::endpoint sender_endpoint;
+   * socket.receive_from(
+   *     asio::buffer(data, size), sender_endpoint);
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive_from(
+        this->implementation, buffers, sender_endpoint, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+  
+  /// Receive a datagram with the endpoint of the sender.
+  /**
+   * This function is used to receive a datagram. The function call will block
+   * until data has been received successfully or an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the datagram.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive_from(
+        this->implementation, buffers, sender_endpoint, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+  
+  /// Receive a datagram with the endpoint of the sender.
+  /**
+   * This function is used to receive a datagram. The function call will block
+   * until data has been received successfully or an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the datagram.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes received.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    return this->service.receive_from(this->implementation, buffers,
+        sender_endpoint, flags, ec);
+  }
+
+  /// Start an asynchronous receive.
+  /**
+   * This function is used to asynchronously receive a datagram. The function
+   * call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the datagram. Ownership of the sender_endpoint object
+   * is retained by the caller, which must guarantee that it is valid until the
+   * handler is called.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code socket.async_receive_from(
+   *     asio::buffer(data, size), 0, sender_endpoint, handler); @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, ReadHandler handler)
+  {
+    this->service.async_receive_from(this->implementation, buffers,
+        sender_endpoint, 0, handler);
+  }
+
+  /// Start an asynchronous receive.
+  /**
+   * This function is used to asynchronously receive a datagram. The function
+   * call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the datagram. Ownership of the sender_endpoint object
+   * is retained by the caller, which must guarantee that it is valid until the
+   * handler is called.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags,
+      ReadHandler handler)
+  {
+    this->service.async_receive_from(this->implementation, buffers,
+        sender_endpoint, flags, handler);
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_DATAGRAM_SOCKET_HPP
diff --git a/ext/asio/basic_deadline_timer.hpp b/ext/asio/basic_deadline_timer.hpp
new file mode 100644
index 0000000000..0d183f76ca
--- /dev/null
+++ b/ext/asio/basic_deadline_timer.hpp
@@ -0,0 +1,445 @@
+//
+// basic_deadline_timer.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_DEADLINE_TIMER_HPP
+#define ASIO_BASIC_DEADLINE_TIMER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_io_object.hpp"
+#include "asio/deadline_timer_service.hpp"
+#include "asio/error.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+/// Provides waitable timer functionality.
+/**
+ * The basic_deadline_timer class template provides the ability to perform a
+ * blocking or asynchronous wait for a timer to expire.
+ *
+ * A deadline timer is always in one of two states: "expired" or "not expired".
+ * If the wait() or async_wait() function is called on an expired timer, the
+ * wait operation will complete immediately.
+ *
+ * Most applications will use the asio::deadline_timer typedef.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Examples
+ * Performing a blocking wait:
+ * @code
+ * // Construct a timer without setting an expiry time.
+ * asio::deadline_timer timer(io_service);
+ *
+ * // Set an expiry time relative to now.
+ * timer.expires_from_now(boost::posix_time::seconds(5));
+ *
+ * // Wait for the timer to expire.
+ * timer.wait();
+ * @endcode
+ *
+ * @par 
+ * Performing an asynchronous wait:
+ * @code
+ * void handler(const asio::error_code& error)
+ * {
+ *   if (!error)
+ *   {
+ *     // Timer expired.
+ *   }
+ * }
+ *
+ * ...
+ *
+ * // Construct a timer with an absolute expiry time.
+ * asio::deadline_timer timer(io_service,
+ *     boost::posix_time::time_from_string("2005-12-07 23:59:59.000"));
+ *
+ * // Start an asynchronous wait.
+ * timer.async_wait(handler);
+ * @endcode
+ *
+ * @par Changing an active deadline_timer's expiry time
+ *
+ * Changing the expiry time of a timer while there are pending asynchronous
+ * waits causes those wait operations to be cancelled. To ensure that the action
+ * associated with the timer is performed only once, use something like this:
+ * used:
+ *
+ * @code
+ * void on_some_event()
+ * {
+ *   if (my_timer.expires_from_now(seconds(5)) > 0)
+ *   {
+ *     // We managed to cancel the timer. Start new asynchronous wait.
+ *     my_timer.async_wait(on_timeout);
+ *   }
+ *   else
+ *   {
+ *     // Too late, timer has already expired!
+ *   }
+ * }
+ *
+ * void on_timeout(const asio::error_code& e)
+ * {
+ *   if (e != asio::error::operation_aborted)
+ *   {
+ *     // Timer was not cancelled, take necessary action.
+ *   }
+ * }
+ * @endcode
+ *
+ * @li The asio::basic_deadline_timer::expires_from_now() function
+ * cancels any pending asynchronous waits, and returns the number of
+ * asynchronous waits that were cancelled. If it returns 0 then you were too
+ * late and the wait handler has already been executed, or will soon be
+ * executed. If it returns 1 then the wait handler was successfully cancelled.
+ *
+ * @li If a wait handler is cancelled, the asio::error_code passed to
+ * it contains the value asio::error::operation_aborted.
+ */
+template <typename Time,
+    typename TimeTraits = asio::time_traits<Time>,
+    typename TimerService = deadline_timer_service<Time, TimeTraits> >
+class basic_deadline_timer
+  : public basic_io_object<TimerService>
+{
+public:
+  /// The time traits type.
+  typedef TimeTraits traits_type;
+
+  /// The time type.
+  typedef typename traits_type::time_type time_type;
+
+  /// The duration type.
+  typedef typename traits_type::duration_type duration_type;
+
+  /// Constructor.
+  /**
+   * This constructor creates a timer without setting an expiry time. The
+   * expires_at() or expires_from_now() functions must be called to set an
+   * expiry time before the timer can be waited on.
+   *
+   * @param io_service The io_service object that the timer will use to dispatch
+   * handlers for any asynchronous operations performed on the timer.
+   */
+  explicit basic_deadline_timer(asio::io_service& io_service)
+    : basic_io_object<TimerService>(io_service)
+  {
+  }
+
+  /// Constructor to set a particular expiry time as an absolute time.
+  /**
+   * This constructor creates a timer and sets the expiry time.
+   *
+   * @param io_service The io_service object that the timer will use to dispatch
+   * handlers for any asynchronous operations performed on the timer.
+   *
+   * @param expiry_time The expiry time to be used for the timer, expressed
+   * as an absolute time.
+   */
+  basic_deadline_timer(asio::io_service& io_service,
+      const time_type& expiry_time)
+    : basic_io_object<TimerService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.expires_at(this->implementation, expiry_time, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Constructor to set a particular expiry time relative to now.
+  /**
+   * This constructor creates a timer and sets the expiry time.
+   *
+   * @param io_service The io_service object that the timer will use to dispatch
+   * handlers for any asynchronous operations performed on the timer.
+   *
+   * @param expiry_time The expiry time to be used for the timer, relative to
+   * now.
+   */
+  basic_deadline_timer(asio::io_service& io_service,
+      const duration_type& expiry_time)
+    : basic_io_object<TimerService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.expires_from_now(this->implementation, expiry_time, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Cancel any asynchronous operations that are waiting on the timer.
+  /**
+   * This function forces the completion of any pending asynchronous wait
+   * operations against the timer. The handler for each cancelled operation will
+   * be invoked with the asio::error::operation_aborted error code.
+   *
+   * Cancelling the timer does not change the expiry time.
+   *
+   * @return The number of asynchronous operations that were cancelled.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note If the timer has already expired when cancel() is called, then the
+   * handlers for asynchronous wait operations will:
+   *
+   * @li have already been invoked; or
+   *
+   * @li have been queued for invocation in the near future.
+   *
+   * These handlers can no longer be cancelled, and therefore are passed an
+   * error code that indicates the successful completion of the wait operation.
+   */
+  std::size_t cancel()
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.cancel(this->implementation, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Cancel any asynchronous operations that are waiting on the timer.
+  /**
+   * This function forces the completion of any pending asynchronous wait
+   * operations against the timer. The handler for each cancelled operation will
+   * be invoked with the asio::error::operation_aborted error code.
+   *
+   * Cancelling the timer does not change the expiry time.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of asynchronous operations that were cancelled.
+   *
+   * @note If the timer has already expired when cancel() is called, then the
+   * handlers for asynchronous wait operations will:
+   *
+   * @li have already been invoked; or
+   *
+   * @li have been queued for invocation in the near future.
+   *
+   * These handlers can no longer be cancelled, and therefore are passed an
+   * error code that indicates the successful completion of the wait operation.
+   */
+  std::size_t cancel(asio::error_code& ec)
+  {
+    return this->service.cancel(this->implementation, ec);
+  }
+
+  /// Get the timer's expiry time as an absolute time.
+  /**
+   * This function may be used to obtain the timer's current expiry time.
+   * Whether the timer has expired or not does not affect this value.
+   */
+  time_type expires_at() const
+  {
+    return this->service.expires_at(this->implementation);
+  }
+
+  /// Set the timer's expiry time as an absolute time.
+  /**
+   * This function sets the expiry time. Any pending asynchronous wait
+   * operations will be cancelled. The handler for each cancelled operation will
+   * be invoked with the asio::error::operation_aborted error code.
+   *
+   * @param expiry_time The expiry time to be used for the timer.
+   *
+   * @return The number of asynchronous operations that were cancelled.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note If the timer has already expired when expires_at() is called, then
+   * the handlers for asynchronous wait operations will:
+   *
+   * @li have already been invoked; or
+   *
+   * @li have been queued for invocation in the near future.
+   *
+   * These handlers can no longer be cancelled, and therefore are passed an
+   * error code that indicates the successful completion of the wait operation.
+   */
+  std::size_t expires_at(const time_type& expiry_time)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.expires_at(
+        this->implementation, expiry_time, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Set the timer's expiry time as an absolute time.
+  /**
+   * This function sets the expiry time. Any pending asynchronous wait
+   * operations will be cancelled. The handler for each cancelled operation will
+   * be invoked with the asio::error::operation_aborted error code.
+   *
+   * @param expiry_time The expiry time to be used for the timer.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of asynchronous operations that were cancelled.
+   *
+   * @note If the timer has already expired when expires_at() is called, then
+   * the handlers for asynchronous wait operations will:
+   *
+   * @li have already been invoked; or
+   *
+   * @li have been queued for invocation in the near future.
+   *
+   * These handlers can no longer be cancelled, and therefore are passed an
+   * error code that indicates the successful completion of the wait operation.
+   */
+  std::size_t expires_at(const time_type& expiry_time,
+      asio::error_code& ec)
+  {
+    return this->service.expires_at(this->implementation, expiry_time, ec);
+  }
+
+  /// Get the timer's expiry time relative to now.
+  /**
+   * This function may be used to obtain the timer's current expiry time.
+   * Whether the timer has expired or not does not affect this value.
+   */
+  duration_type expires_from_now() const
+  {
+    return this->service.expires_from_now(this->implementation);
+  }
+
+  /// Set the timer's expiry time relative to now.
+  /**
+   * This function sets the expiry time. Any pending asynchronous wait
+   * operations will be cancelled. The handler for each cancelled operation will
+   * be invoked with the asio::error::operation_aborted error code.
+   *
+   * @param expiry_time The expiry time to be used for the timer.
+   *
+   * @return The number of asynchronous operations that were cancelled.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note If the timer has already expired when expires_from_now() is called,
+   * then the handlers for asynchronous wait operations will:
+   *
+   * @li have already been invoked; or
+   *
+   * @li have been queued for invocation in the near future.
+   *
+   * These handlers can no longer be cancelled, and therefore are passed an
+   * error code that indicates the successful completion of the wait operation.
+   */
+  std::size_t expires_from_now(const duration_type& expiry_time)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.expires_from_now(
+        this->implementation, expiry_time, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Set the timer's expiry time relative to now.
+  /**
+   * This function sets the expiry time. Any pending asynchronous wait
+   * operations will be cancelled. The handler for each cancelled operation will
+   * be invoked with the asio::error::operation_aborted error code.
+   *
+   * @param expiry_time The expiry time to be used for the timer.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of asynchronous operations that were cancelled.
+   *
+   * @note If the timer has already expired when expires_from_now() is called,
+   * then the handlers for asynchronous wait operations will:
+   *
+   * @li have already been invoked; or
+   *
+   * @li have been queued for invocation in the near future.
+   *
+   * These handlers can no longer be cancelled, and therefore are passed an
+   * error code that indicates the successful completion of the wait operation.
+   */
+  std::size_t expires_from_now(const duration_type& expiry_time,
+      asio::error_code& ec)
+  {
+    return this->service.expires_from_now(
+        this->implementation, expiry_time, ec);
+  }
+
+  /// Perform a blocking wait on the timer.
+  /**
+   * This function is used to wait for the timer to expire. This function
+   * blocks and does not return until the timer has expired.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void wait()
+  {
+    asio::error_code ec;
+    this->service.wait(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Perform a blocking wait on the timer.
+  /**
+   * This function is used to wait for the timer to expire. This function
+   * blocks and does not return until the timer has expired.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  void wait(asio::error_code& ec)
+  {
+    this->service.wait(this->implementation, ec);
+  }
+
+  /// Start an asynchronous wait on the timer.
+  /**
+   * This function may be used to initiate an asynchronous wait against the
+   * timer. It always returns immediately.
+   *
+   * For each call to async_wait(), the supplied handler will be called exactly
+   * once. The handler will be called when:
+   *
+   * @li The timer has expired.
+   *
+   * @li The timer was cancelled, in which case the handler is passed the error
+   * code asio::error::operation_aborted.
+   *
+   * @param handler The handler to be called when the timer expires. Copies
+   * will be made of the handler as required. The function signature of the
+   * handler must be:
+   * @code void handler(
+   *   const asio::error_code& error // Result of operation.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   */
+  template <typename WaitHandler>
+  void async_wait(WaitHandler handler)
+  {
+    this->service.async_wait(this->implementation, handler);
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_DEADLINE_TIMER_HPP
diff --git a/ext/asio/basic_io_object.hpp b/ext/asio/basic_io_object.hpp
new file mode 100644
index 0000000000..092170df94
--- /dev/null
+++ b/ext/asio/basic_io_object.hpp
@@ -0,0 +1,97 @@
+//
+// basic_io_object.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_IO_OBJECT_HPP
+#define ASIO_BASIC_IO_OBJECT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+
+/// Base class for all I/O objects.
+template <typename IoObjectService>
+class basic_io_object
+  : private noncopyable
+{
+public:
+  /// The type of the service that will be used to provide I/O operations.
+  typedef IoObjectService service_type;
+
+  /// The underlying implementation type of I/O object.
+  typedef typename service_type::implementation_type implementation_type;
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with
+  /// the object.
+  /**
+   * This function may be used to obtain the io_service object that the I/O
+   * object uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_service object that the I/O object will use
+   * to dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_service& io_service()
+  {
+    return service.get_io_service();
+  }
+
+  /// Get the io_service associated with the object.
+  /**
+   * This function may be used to obtain the io_service object that the I/O
+   * object uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_service object that the I/O object will use
+   * to dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_service& get_io_service()
+  {
+    return service.get_io_service();
+  }
+
+protected:
+  /// Construct a basic_io_object.
+  /**
+   * Performs:
+   * @code service.construct(implementation); @endcode
+   */
+  explicit basic_io_object(asio::io_service& io_service)
+    : service(asio::use_service<IoObjectService>(io_service))
+  {
+    service.construct(implementation);
+  }
+
+  /// Protected destructor to prevent deletion through this type.
+  /**
+   * Performs:
+   * @code service.destroy(implementation); @endcode
+   */
+  ~basic_io_object()
+  {
+    service.destroy(implementation);
+  }
+
+  /// The service associated with the I/O object.
+  service_type& service;
+
+  /// The underlying implementation of the I/O object.
+  implementation_type implementation;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_IO_OBJECT_HPP
diff --git a/ext/asio/basic_raw_socket.hpp b/ext/asio/basic_raw_socket.hpp
new file mode 100644
index 0000000000..9d93b97f14
--- /dev/null
+++ b/ext/asio/basic_raw_socket.hpp
@@ -0,0 +1,798 @@
+//
+// basic_raw_socket.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_RAW_SOCKET_HPP
+#define ASIO_BASIC_RAW_SOCKET_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_socket.hpp"
+#include "asio/raw_socket_service.hpp"
+#include "asio/error.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+/// Provides raw-oriented socket functionality.
+/**
+ * The basic_raw_socket class template provides asynchronous and blocking
+ * raw-oriented socket functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename Protocol,
+    typename RawSocketService = raw_socket_service<Protocol> >
+class basic_raw_socket
+  : public basic_socket<Protocol, RawSocketService>
+{
+public:
+  /// The native representation of a socket.
+  typedef typename RawSocketService::native_type native_type;
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  /// Construct a basic_raw_socket without opening it.
+  /**
+   * This constructor creates a raw socket without opening it. The open()
+   * function must be called before data can be sent or received on the socket.
+   *
+   * @param io_service The io_service object that the raw socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   */
+  explicit basic_raw_socket(asio::io_service& io_service)
+    : basic_socket<Protocol, RawSocketService>(io_service)
+  {
+  }
+
+  /// Construct and open a basic_raw_socket.
+  /**
+   * This constructor creates and opens a raw socket.
+   *
+   * @param io_service The io_service object that the raw socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_raw_socket(asio::io_service& io_service,
+      const protocol_type& protocol)
+    : basic_socket<Protocol, RawSocketService>(io_service, protocol)
+  {
+  }
+
+  /// Construct a basic_raw_socket, opening it and binding it to the given
+  /// local endpoint.
+  /**
+   * This constructor creates a raw socket and automatically opens it bound
+   * to the specified endpoint on the local machine. The protocol used is the
+   * protocol associated with the given endpoint.
+   *
+   * @param io_service The io_service object that the raw socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   *
+   * @param endpoint An endpoint on the local machine to which the raw
+   * socket will be bound.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_raw_socket(asio::io_service& io_service,
+      const endpoint_type& endpoint)
+    : basic_socket<Protocol, RawSocketService>(io_service, endpoint)
+  {
+  }
+
+  /// Construct a basic_raw_socket on an existing native socket.
+  /**
+   * This constructor creates a raw socket object to hold an existing
+   * native socket.
+   *
+   * @param io_service The io_service object that the raw socket will use
+   * to dispatch handlers for any asynchronous operations performed on the
+   * socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @param native_socket The new underlying socket implementation.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_raw_socket(asio::io_service& io_service,
+      const protocol_type& protocol, const native_type& native_socket)
+    : basic_socket<Protocol, RawSocketService>(
+        io_service, protocol, native_socket)
+  {
+  }
+
+  /// Send some data on a connected socket.
+  /**
+   * This function is used to send data on the raw socket. The function call
+   * will block until the data has been sent successfully or an error occurs.
+   *
+   * @param buffers One ore more data buffers to be sent on the socket.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The send operation can only be used with a connected socket. Use
+   * the send_to function to send data on an unconnected raw socket.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code socket.send(asio::buffer(data, size)); @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send(this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send some data on a connected socket.
+  /**
+   * This function is used to send data on the raw socket. The function call
+   * will block until the data has been sent successfully or an error occurs.
+   *
+   * @param buffers One ore more data buffers to be sent on the socket.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The send operation can only be used with a connected socket. Use
+   * the send_to function to send data on an unconnected raw socket.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send(
+        this->implementation, buffers, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send some data on a connected socket.
+  /**
+   * This function is used to send data on the raw socket. The function call
+   * will block until the data has been sent successfully or an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @note The send operation can only be used with a connected socket. Use
+   * the send_to function to send data on an unconnected raw socket.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return this->service.send(this->implementation, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous send on a connected socket.
+  /**
+   * This function is used to send data on the raw socket. The function call
+   * will block until the data has been sent successfully or an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket. Although
+   * the buffers object may be copied as necessary, ownership of the underlying
+   * memory blocks is retained by the caller, which must guarantee that they
+   * remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_send operation can only be used with a connected socket.
+   * Use the async_send_to function to send data on an unconnected raw
+   * socket.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.async_send(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    this->service.async_send(this->implementation, buffers, 0, handler);
+  }
+
+  /// Start an asynchronous send on a connected socket.
+  /**
+   * This function is used to send data on the raw socket. The function call
+   * will block until the data has been sent successfully or an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket. Although
+   * the buffers object may be copied as necessary, ownership of the underlying
+   * memory blocks is retained by the caller, which must guarantee that they
+   * remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_send operation can only be used with a connected socket.
+   * Use the async_send_to function to send data on an unconnected raw
+   * socket.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    this->service.async_send(this->implementation, buffers, flags, handler);
+  }
+
+  /// Send raw data to the specified endpoint.
+  /**
+   * This function is used to send raw data to the specified remote endpoint.
+   * The function call will block until the data has been sent successfully or
+   * an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * asio::ip::udp::endpoint destination(
+   *     asio::ip::address::from_string("1.2.3.4"), 12345);
+   * socket.send_to(asio::buffer(data, size), destination);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send_to(
+        this->implementation, buffers, destination, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send raw data to the specified endpoint.
+  /**
+   * This function is used to send raw data to the specified remote endpoint.
+   * The function call will block until the data has been sent successfully or
+   * an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send_to(
+        this->implementation, buffers, destination, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send raw data to the specified endpoint.
+  /**
+   * This function is used to send raw data to the specified remote endpoint.
+   * The function call will block until the data has been sent successfully or
+   * an error occurs.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes sent.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    return this->service.send_to(this->implementation,
+        buffers, destination, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  /**
+   * This function is used to asynchronously send raw data to the specified
+   * remote endpoint. The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   * Copies will be made of the endpoint as required.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * asio::ip::udp::endpoint destination(
+   *     asio::ip::address::from_string("1.2.3.4"), 12345);
+   * socket.async_send_to(
+   *     asio::buffer(data, size), destination, handler);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, WriteHandler handler)
+  {
+    this->service.async_send_to(this->implementation, buffers, destination, 0,
+        handler);
+  }
+
+  /// Start an asynchronous send.
+  /**
+   * This function is used to asynchronously send raw data to the specified
+   * remote endpoint. The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be sent to the remote endpoint.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param destination The remote endpoint to which the data will be sent.
+   * Copies will be made of the endpoint as required.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send_to(const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags,
+      WriteHandler handler)
+  {
+    this->service.async_send_to(this->implementation, buffers, destination,
+        flags, handler);
+  }
+
+  /// Receive some data on a connected socket.
+  /**
+   * This function is used to receive data on the raw socket. The function
+   * call will block until data has been received successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The receive operation can only be used with a connected socket. Use
+   * the receive_from function to receive data on an unconnected raw
+   * socket.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code socket.receive(asio::buffer(data, size)); @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive(
+        this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Receive some data on a connected socket.
+  /**
+   * This function is used to receive data on the raw socket. The function
+   * call will block until data has been received successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The receive operation can only be used with a connected socket. Use
+   * the receive_from function to receive data on an unconnected raw
+   * socket.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive(
+        this->implementation, buffers, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Receive some data on a connected socket.
+  /**
+   * This function is used to receive data on the raw socket. The function
+   * call will block until data has been received successfully or an error
+   * occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes received.
+   *
+   * @note The receive operation can only be used with a connected socket. Use
+   * the receive_from function to receive data on an unconnected raw
+   * socket.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return this->service.receive(this->implementation, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous receive on a connected socket.
+  /**
+   * This function is used to asynchronously receive data from the raw
+   * socket. The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_receive operation can only be used with a connected socket.
+   * Use the async_receive_from function to receive data on an unconnected
+   * raw socket.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * socket.async_receive(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    this->service.async_receive(this->implementation, buffers, 0, handler);
+  }
+
+  /// Start an asynchronous receive on a connected socket.
+  /**
+   * This function is used to asynchronously receive data from the raw
+   * socket. The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The async_receive operation can only be used with a connected socket.
+   * Use the async_receive_from function to receive data on an unconnected
+   * raw socket.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    this->service.async_receive(this->implementation, buffers, flags, handler);
+  }
+
+  /// Receive raw data with the endpoint of the sender.
+  /**
+   * This function is used to receive raw data. The function call will block
+   * until data has been received successfully or an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the data.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * asio::ip::udp::endpoint sender_endpoint;
+   * socket.receive_from(
+   *     asio::buffer(data, size), sender_endpoint);
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive_from(
+        this->implementation, buffers, sender_endpoint, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+  
+  /// Receive raw data with the endpoint of the sender.
+  /**
+   * This function is used to receive raw data. The function call will block
+   * until data has been received successfully or an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the data.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive_from(
+        this->implementation, buffers, sender_endpoint, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+  
+  /// Receive raw data with the endpoint of the sender.
+  /**
+   * This function is used to receive raw data. The function call will block
+   * until data has been received successfully or an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the data.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes received.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    return this->service.receive_from(this->implementation, buffers,
+        sender_endpoint, flags, ec);
+  }
+
+  /// Start an asynchronous receive.
+  /**
+   * This function is used to asynchronously receive raw data. The function
+   * call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the data. Ownership of the sender_endpoint object
+   * is retained by the caller, which must guarantee that it is valid until the
+   * handler is called.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code socket.async_receive_from(
+   *     asio::buffer(data, size), 0, sender_endpoint, handler); @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, ReadHandler handler)
+  {
+    this->service.async_receive_from(this->implementation, buffers,
+        sender_endpoint, 0, handler);
+  }
+
+  /// Start an asynchronous receive.
+  /**
+   * This function is used to asynchronously receive raw data. The function
+   * call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param sender_endpoint An endpoint object that receives the endpoint of
+   * the remote sender of the data. Ownership of the sender_endpoint object
+   * is retained by the caller, which must guarantee that it is valid until the
+   * handler is called.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive_from(const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags,
+      ReadHandler handler)
+  {
+    this->service.async_receive_from(this->implementation, buffers,
+        sender_endpoint, flags, handler);
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_RAW_SOCKET_HPP
diff --git a/ext/asio/basic_serial_port.hpp b/ext/asio/basic_serial_port.hpp
new file mode 100644
index 0000000000..edb7bb07a0
--- /dev/null
+++ b/ext/asio/basic_serial_port.hpp
@@ -0,0 +1,622 @@
+//
+// basic_serial_port.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_SERIAL_PORT_HPP
+#define ASIO_BASIC_SERIAL_PORT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <string>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_io_object.hpp"
+#include "asio/error.hpp"
+#include "asio/serial_port_base.hpp"
+#include "asio/serial_port_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if defined(ASIO_HAS_SERIAL_PORT) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+
+/// Provides serial port functionality.
+/**
+ * The basic_serial_port class template provides functionality that is common
+ * to all serial ports.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename SerialPortService = serial_port_service>
+class basic_serial_port
+  : public basic_io_object<SerialPortService>,
+    public serial_port_base
+{
+public:
+  /// The native representation of a serial port.
+  typedef typename SerialPortService::native_type native_type;
+
+  /// A basic_serial_port is always the lowest layer.
+  typedef basic_serial_port<SerialPortService> lowest_layer_type;
+
+  /// Construct a basic_serial_port without opening it.
+  /**
+   * This constructor creates a serial port without opening it.
+   *
+   * @param io_service The io_service object that the serial port will use to
+   * dispatch handlers for any asynchronous operations performed on the port.
+   */
+  explicit basic_serial_port(asio::io_service& io_service)
+    : basic_io_object<SerialPortService>(io_service)
+  {
+  }
+
+  /// Construct and open a basic_serial_port.
+  /**
+   * This constructor creates and opens a serial port for the specified device
+   * name.
+   *
+   * @param io_service The io_service object that the serial port will use to
+   * dispatch handlers for any asynchronous operations performed on the port.
+   *
+   * @param device The platform-specific device name for this serial
+   * port.
+   */
+  explicit basic_serial_port(asio::io_service& io_service,
+      const char* device)
+    : basic_io_object<SerialPortService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, device, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Construct and open a basic_serial_port.
+  /**
+   * This constructor creates and opens a serial port for the specified device
+   * name.
+   *
+   * @param io_service The io_service object that the serial port will use to
+   * dispatch handlers for any asynchronous operations performed on the port.
+   *
+   * @param device The platform-specific device name for this serial
+   * port.
+   */
+  explicit basic_serial_port(asio::io_service& io_service,
+      const std::string& device)
+    : basic_io_object<SerialPortService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, device, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Construct a basic_serial_port on an existing native serial port.
+  /**
+   * This constructor creates a serial port object to hold an existing native
+   * serial port.
+   *
+   * @param io_service The io_service object that the serial port will use to
+   * dispatch handlers for any asynchronous operations performed on the port.
+   *
+   * @param native_serial_port A native serial port.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_serial_port(asio::io_service& io_service,
+      const native_type& native_serial_port)
+    : basic_io_object<SerialPortService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, native_serial_port, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * layers. Since a basic_serial_port cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A reference to the lowest layer in the stack of layers. Ownership
+   * is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return *this;
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * layers. Since a basic_serial_port cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A const reference to the lowest layer in the stack of layers.
+   * Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return *this;
+  }
+
+  /// Open the serial port using the specified device name.
+  /**
+   * This function opens the serial port for the specified device name.
+   *
+   * @param device The platform-specific device name.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void open(const std::string& device)
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, device, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Open the serial port using the specified device name.
+  /**
+   * This function opens the serial port using the given platform-specific
+   * device name.
+   *
+   * @param device The platform-specific device name.
+   *
+   * @param ec Set the indicate what error occurred, if any.
+   */
+  asio::error_code open(const std::string& device,
+      asio::error_code& ec)
+  {
+    return this->service.open(this->implementation, device, ec);
+  }
+
+  /// Assign an existing native serial port to the serial port.
+  /*
+   * This function opens the serial port to hold an existing native serial port.
+   *
+   * @param native_serial_port A native serial port.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void assign(const native_type& native_serial_port)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, native_serial_port, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Assign an existing native serial port to the serial port.
+  /*
+   * This function opens the serial port to hold an existing native serial port.
+   *
+   * @param native_serial_port A native serial port.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code assign(const native_type& native_serial_port,
+      asio::error_code& ec)
+  {
+    return this->service.assign(this->implementation, native_serial_port, ec);
+  }
+
+  /// Determine whether the serial port is open.
+  bool is_open() const
+  {
+    return this->service.is_open(this->implementation);
+  }
+
+  /// Close the serial port.
+  /**
+   * This function is used to close the serial port. Any asynchronous read or
+   * write operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void close()
+  {
+    asio::error_code ec;
+    this->service.close(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Close the serial port.
+  /**
+   * This function is used to close the serial port. Any asynchronous read or
+   * write operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code close(asio::error_code& ec)
+  {
+    return this->service.close(this->implementation, ec);
+  }
+
+  /// Get the native serial port representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * serial port. This is intended to allow access to native serial port
+   * functionality that is not otherwise provided.
+   */
+  native_type native()
+  {
+    return this->service.native(this->implementation);
+  }
+
+  /// Cancel all asynchronous operations associated with the serial port.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void cancel()
+  {
+    asio::error_code ec;
+    this->service.cancel(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Cancel all asynchronous operations associated with the serial port.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code cancel(asio::error_code& ec)
+  {
+    return this->service.cancel(this->implementation, ec);
+  }
+
+  /// Send a break sequence to the serial port.
+  /**
+   * This function causes a break sequence of platform-specific duration to be
+   * sent out the serial port.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void send_break()
+  {
+    asio::error_code ec;
+    this->service.send_break(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Send a break sequence to the serial port.
+  /**
+   * This function causes a break sequence of platform-specific duration to be
+   * sent out the serial port.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code send_break(asio::error_code& ec)
+  {
+    return this->service.send_break(this->implementation, ec);
+  }
+
+  /// Set an option on the serial port.
+  /**
+   * This function is used to set an option on the serial port.
+   *
+   * @param option The option value to be set on the serial port.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa SettableSerialPortOption @n
+   * asio::serial_port_base::baud_rate @n
+   * asio::serial_port_base::flow_control @n
+   * asio::serial_port_base::parity @n
+   * asio::serial_port_base::stop_bits @n
+   * asio::serial_port_base::character_size
+   */
+  template <typename SettableSerialPortOption>
+  void set_option(const SettableSerialPortOption& option)
+  {
+    asio::error_code ec;
+    this->service.set_option(this->implementation, option, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Set an option on the serial port.
+  /**
+   * This function is used to set an option on the serial port.
+   *
+   * @param option The option value to be set on the serial port.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa SettableSerialPortOption @n
+   * asio::serial_port_base::baud_rate @n
+   * asio::serial_port_base::flow_control @n
+   * asio::serial_port_base::parity @n
+   * asio::serial_port_base::stop_bits @n
+   * asio::serial_port_base::character_size
+   */
+  template <typename SettableSerialPortOption>
+  asio::error_code set_option(const SettableSerialPortOption& option,
+      asio::error_code& ec)
+  {
+    return this->service.set_option(this->implementation, option, ec);
+  }
+
+  /// Get an option from the serial port.
+  /**
+   * This function is used to get the current value of an option on the serial
+   * port.
+   *
+   * @param option The option value to be obtained from the serial port.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa GettableSerialPortOption @n
+   * asio::serial_port_base::baud_rate @n
+   * asio::serial_port_base::flow_control @n
+   * asio::serial_port_base::parity @n
+   * asio::serial_port_base::stop_bits @n
+   * asio::serial_port_base::character_size
+   */
+  template <typename GettableSerialPortOption>
+  void get_option(GettableSerialPortOption& option)
+  {
+    asio::error_code ec;
+    this->service.get_option(this->implementation, option, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Get an option from the serial port.
+  /**
+   * This function is used to get the current value of an option on the serial
+   * port.
+   *
+   * @param option The option value to be obtained from the serial port.
+   *
+   * @param ec Set to indicate what error occured, if any.
+   *
+   * @sa GettableSerialPortOption @n
+   * asio::serial_port_base::baud_rate @n
+   * asio::serial_port_base::flow_control @n
+   * asio::serial_port_base::parity @n
+   * asio::serial_port_base::stop_bits @n
+   * asio::serial_port_base::character_size
+   */
+  template <typename GettableSerialPortOption>
+  asio::error_code get_option(GettableSerialPortOption& option,
+      asio::error_code& ec)
+  {
+    return this->service.get_option(this->implementation, option, ec);
+  }
+
+  /// Write some data to the serial port.
+  /**
+   * This function is used to write data to the serial port. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the serial port.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * serial_port.write_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.write_some(this->implementation, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Write some data to the serial port.
+  /**
+   * This function is used to write data to the serial port. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the serial port.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.write_some(this->implementation, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  /**
+   * This function is used to asynchronously write data to the serial port.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be written to the serial port.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * serial_port.async_write_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    this->service.async_write_some(this->implementation, buffers, handler);
+  }
+
+  /// Read some data from the serial port.
+  /**
+   * This function is used to read data from the serial port. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * serial_port.read_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.read_some(this->implementation, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Read some data from the serial port.
+  /**
+   * This function is used to read data from the serial port. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.read_some(this->implementation, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  /**
+   * This function is used to asynchronously read data from the serial port.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read function if you need to ensure that the
+   * requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * serial_port.async_read_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    this->service.async_read_some(this->implementation, buffers, handler);
+  }
+};
+
+} // namespace asio
+
+#endif // defined(ASIO_HAS_SERIAL_PORT)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_SERIAL_PORT_HPP
diff --git a/ext/asio/basic_socket.hpp b/ext/asio/basic_socket.hpp
new file mode 100644
index 0000000000..8b3f1d7f6b
--- /dev/null
+++ b/ext/asio/basic_socket.hpp
@@ -0,0 +1,1063 @@
+//
+// basic_socket.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_SOCKET_HPP
+#define ASIO_BASIC_SOCKET_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_io_object.hpp"
+#include "asio/error.hpp"
+#include "asio/socket_base.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+/// Provides socket functionality.
+/**
+ * The basic_socket class template provides functionality that is common to both
+ * stream-oriented and datagram-oriented sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename Protocol, typename SocketService>
+class basic_socket
+  : public basic_io_object<SocketService>,
+    public socket_base
+{
+public:
+  /// The native representation of a socket.
+  typedef typename SocketService::native_type native_type;
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  /// A basic_socket is always the lowest layer.
+  typedef basic_socket<Protocol, SocketService> lowest_layer_type;
+
+  /// Construct a basic_socket without opening it.
+  /**
+   * This constructor creates a socket without opening it.
+   *
+   * @param io_service The io_service object that the socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   */
+  explicit basic_socket(asio::io_service& io_service)
+    : basic_io_object<SocketService>(io_service)
+  {
+  }
+
+  /// Construct and open a basic_socket.
+  /**
+   * This constructor creates and opens a socket.
+   *
+   * @param io_service The io_service object that the socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_socket(asio::io_service& io_service,
+      const protocol_type& protocol)
+    : basic_io_object<SocketService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, protocol, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Construct a basic_socket, opening it and binding it to the given local
+  /// endpoint.
+  /**
+   * This constructor creates a socket and automatically opens it bound to the
+   * specified endpoint on the local machine. The protocol used is the protocol
+   * associated with the given endpoint.
+   *
+   * @param io_service The io_service object that the socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   *
+   * @param endpoint An endpoint on the local machine to which the socket will
+   * be bound.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_socket(asio::io_service& io_service,
+      const endpoint_type& endpoint)
+    : basic_io_object<SocketService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, endpoint.protocol(), ec);
+    asio::detail::throw_error(ec);
+    this->service.bind(this->implementation, endpoint, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Construct a basic_socket on an existing native socket.
+  /**
+   * This constructor creates a socket object to hold an existing native socket.
+   *
+   * @param io_service The io_service object that the socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @param native_socket A native socket.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_socket(asio::io_service& io_service,
+      const protocol_type& protocol, const native_type& native_socket)
+    : basic_io_object<SocketService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, protocol, native_socket, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * layers. Since a basic_socket cannot contain any further layers, it simply
+   * returns a reference to itself.
+   *
+   * @return A reference to the lowest layer in the stack of layers. Ownership
+   * is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return *this;
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * layers. Since a basic_socket cannot contain any further layers, it simply
+   * returns a reference to itself.
+   *
+   * @return A const reference to the lowest layer in the stack of layers.
+   * Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return *this;
+  }
+
+  /// Open the socket using the specified protocol.
+  /**
+   * This function opens the socket so that it will use the specified protocol.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * socket.open(asio::ip::tcp::v4());
+   * @endcode
+   */
+  void open(const protocol_type& protocol = protocol_type())
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, protocol, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Open the socket using the specified protocol.
+  /**
+   * This function opens the socket so that it will use the specified protocol.
+   *
+   * @param protocol An object specifying which protocol is to be used.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * asio::error_code ec;
+   * socket.open(asio::ip::tcp::v4(), ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code open(const protocol_type& protocol,
+      asio::error_code& ec)
+  {
+    return this->service.open(this->implementation, protocol, ec);
+  }
+
+  /// Assign an existing native socket to the socket.
+  /*
+   * This function opens the socket to hold an existing native socket.
+   *
+   * @param protocol An object specifying which protocol is to be used.
+   *
+   * @param native_socket A native socket.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void assign(const protocol_type& protocol, const native_type& native_socket)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, protocol, native_socket, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Assign an existing native socket to the socket.
+  /*
+   * This function opens the socket to hold an existing native socket.
+   *
+   * @param protocol An object specifying which protocol is to be used.
+   *
+   * @param native_socket A native socket.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code assign(const protocol_type& protocol,
+      const native_type& native_socket, asio::error_code& ec)
+  {
+    return this->service.assign(this->implementation,
+        protocol, native_socket, ec);
+  }
+
+  /// Determine whether the socket is open.
+  bool is_open() const
+  {
+    return this->service.is_open(this->implementation);
+  }
+
+  /// Close the socket.
+  /**
+   * This function is used to close the socket. Any asynchronous send, receive
+   * or connect operations will be cancelled immediately, and will complete
+   * with the asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note For portable behaviour with respect to graceful closure of a
+   * connected socket, call shutdown() before closing the socket.
+   */
+  void close()
+  {
+    asio::error_code ec;
+    this->service.close(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Close the socket.
+  /**
+   * This function is used to close the socket. Any asynchronous send, receive
+   * or connect operations will be cancelled immediately, and will complete
+   * with the asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::error_code ec;
+   * socket.close(ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   *
+   * @note For portable behaviour with respect to graceful closure of a
+   * connected socket, call shutdown() before closing the socket.
+   */
+  asio::error_code close(asio::error_code& ec)
+  {
+    return this->service.close(this->implementation, ec);
+  }
+
+  /// Get the native socket representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * socket. This is intended to allow access to native socket functionality
+   * that is not otherwise provided.
+   */
+  native_type native()
+  {
+    return this->service.native(this->implementation);
+  }
+
+  /// Cancel all asynchronous operations associated with the socket.
+  /**
+   * This function causes all outstanding asynchronous connect, send and receive
+   * operations to finish immediately, and the handlers for cancelled operations
+   * will be passed the asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note Calls to cancel() will always fail with
+   * asio::error::operation_not_supported when run on Windows XP, Windows
+   * Server 2003, and earlier versions of Windows, unless
+   * ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
+   * two issues that should be considered before enabling its use:
+   *
+   * @li It will only cancel asynchronous operations that were initiated in the
+   * current thread.
+   *
+   * @li It can appear to complete without error, but the request to cancel the
+   * unfinished operations may be silently ignored by the operating system.
+   * Whether it works or not seems to depend on the drivers that are installed.
+   *
+   * For portable cancellation, consider using one of the following
+   * alternatives:
+   *
+   * @li Disable asio's I/O completion port backend by defining
+   * ASIO_DISABLE_IOCP.
+   *
+   * @li Use the close() function to simultaneously cancel the outstanding
+   * operations and close the socket.
+   *
+   * When running on Windows Vista, Windows Server 2008, and later, the
+   * CancelIoEx function is always used. This function does not have the
+   * problems described above.
+   */
+#if defined(BOOST_MSVC) && (BOOST_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
+  && !defined(ASIO_ENABLE_CANCELIO)
+  __declspec(deprecated("By default, this function always fails with "
+        "operation_not_supported when used on Windows XP, Windows Server 2003, "
+        "or earlier. Consult documentation for details."))
+#endif
+  void cancel()
+  {
+    asio::error_code ec;
+    this->service.cancel(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Cancel all asynchronous operations associated with the socket.
+  /**
+   * This function causes all outstanding asynchronous connect, send and receive
+   * operations to finish immediately, and the handlers for cancelled operations
+   * will be passed the asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @note Calls to cancel() will always fail with
+   * asio::error::operation_not_supported when run on Windows XP, Windows
+   * Server 2003, and earlier versions of Windows, unless
+   * ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
+   * two issues that should be considered before enabling its use:
+   *
+   * @li It will only cancel asynchronous operations that were initiated in the
+   * current thread.
+   *
+   * @li It can appear to complete without error, but the request to cancel the
+   * unfinished operations may be silently ignored by the operating system.
+   * Whether it works or not seems to depend on the drivers that are installed.
+   *
+   * For portable cancellation, consider using one of the following
+   * alternatives:
+   *
+   * @li Disable asio's I/O completion port backend by defining
+   * ASIO_DISABLE_IOCP.
+   *
+   * @li Use the close() function to simultaneously cancel the outstanding
+   * operations and close the socket.
+   *
+   * When running on Windows Vista, Windows Server 2008, and later, the
+   * CancelIoEx function is always used. This function does not have the
+   * problems described above.
+   */
+#if defined(BOOST_MSVC) && (BOOST_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
+  && !defined(ASIO_ENABLE_CANCELIO)
+  __declspec(deprecated("By default, this function always fails with "
+        "operation_not_supported when used on Windows XP, Windows Server 2003, "
+        "or earlier. Consult documentation for details."))
+#endif
+  asio::error_code cancel(asio::error_code& ec)
+  {
+    return this->service.cancel(this->implementation, ec);
+  }
+
+  /// Determine whether the socket is at the out-of-band data mark.
+  /**
+   * This function is used to check whether the socket input is currently
+   * positioned at the out-of-band data mark.
+   *
+   * @return A bool indicating whether the socket is at the out-of-band data
+   * mark.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  bool at_mark() const
+  {
+    asio::error_code ec;
+    bool b = this->service.at_mark(this->implementation, ec);
+    asio::detail::throw_error(ec);
+    return b;
+  }
+
+  /// Determine whether the socket is at the out-of-band data mark.
+  /**
+   * This function is used to check whether the socket input is currently
+   * positioned at the out-of-band data mark.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return A bool indicating whether the socket is at the out-of-band data
+   * mark.
+   */
+  bool at_mark(asio::error_code& ec) const
+  {
+    return this->service.at_mark(this->implementation, ec);
+  }
+
+  /// Determine the number of bytes available for reading.
+  /**
+   * This function is used to determine the number of bytes that may be read
+   * without blocking.
+   *
+   * @return The number of bytes that may be read without blocking, or 0 if an
+   * error occurs.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  std::size_t available() const
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.available(this->implementation, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Determine the number of bytes available for reading.
+  /**
+   * This function is used to determine the number of bytes that may be read
+   * without blocking.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of bytes that may be read without blocking, or 0 if an
+   * error occurs.
+   */
+  std::size_t available(asio::error_code& ec) const
+  {
+    return this->service.available(this->implementation, ec);
+  }
+
+  /// Bind the socket to the given local endpoint.
+  /**
+   * This function binds the socket to the specified endpoint on the local
+   * machine.
+   *
+   * @param endpoint An endpoint on the local machine to which the socket will
+   * be bound.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * socket.open(asio::ip::tcp::v4());
+   * socket.bind(asio::ip::tcp::endpoint(
+   *       asio::ip::tcp::v4(), 12345));
+   * @endcode
+   */
+  void bind(const endpoint_type& endpoint)
+  {
+    asio::error_code ec;
+    this->service.bind(this->implementation, endpoint, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Bind the socket to the given local endpoint.
+  /**
+   * This function binds the socket to the specified endpoint on the local
+   * machine.
+   *
+   * @param endpoint An endpoint on the local machine to which the socket will
+   * be bound.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * socket.open(asio::ip::tcp::v4());
+   * asio::error_code ec;
+   * socket.bind(asio::ip::tcp::endpoint(
+   *       asio::ip::tcp::v4(), 12345), ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code bind(const endpoint_type& endpoint,
+      asio::error_code& ec)
+  {
+    return this->service.bind(this->implementation, endpoint, ec);
+  }
+
+  /// Connect the socket to the specified endpoint.
+  /**
+   * This function is used to connect a socket to the specified remote endpoint.
+   * The function call will block until the connection is successfully made or
+   * an error occurs.
+   *
+   * The socket is automatically opened if it is not already open. If the
+   * connect fails, and the socket was automatically opened, the socket is
+   * not returned to the closed state.
+   *
+   * @param peer_endpoint The remote endpoint to which the socket will be
+   * connected.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * asio::ip::tcp::endpoint endpoint(
+   *     asio::ip::address::from_string("1.2.3.4"), 12345);
+   * socket.connect(endpoint);
+   * @endcode
+   */
+  void connect(const endpoint_type& peer_endpoint)
+  {
+    asio::error_code ec;
+    if (!is_open())
+    {
+      this->service.open(this->implementation, peer_endpoint.protocol(), ec);
+      asio::detail::throw_error(ec);
+    }
+    this->service.connect(this->implementation, peer_endpoint, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Connect the socket to the specified endpoint.
+  /**
+   * This function is used to connect a socket to the specified remote endpoint.
+   * The function call will block until the connection is successfully made or
+   * an error occurs.
+   *
+   * The socket is automatically opened if it is not already open. If the
+   * connect fails, and the socket was automatically opened, the socket is
+   * not returned to the closed state.
+   *
+   * @param peer_endpoint The remote endpoint to which the socket will be
+   * connected.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * asio::ip::tcp::endpoint endpoint(
+   *     asio::ip::address::from_string("1.2.3.4"), 12345);
+   * asio::error_code ec;
+   * socket.connect(endpoint, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code connect(const endpoint_type& peer_endpoint,
+      asio::error_code& ec)
+  {
+    if (!is_open())
+    {
+      if (this->service.open(this->implementation,
+            peer_endpoint.protocol(), ec))
+      {
+        return ec;
+      }
+    }
+
+    return this->service.connect(this->implementation, peer_endpoint, ec);
+  }
+
+  /// Start an asynchronous connect.
+  /**
+   * This function is used to asynchronously connect a socket to the specified
+   * remote endpoint. The function call always returns immediately.
+   *
+   * The socket is automatically opened if it is not already open. If the
+   * connect fails, and the socket was automatically opened, the socket is
+   * not returned to the closed state.
+   *
+   * @param peer_endpoint The remote endpoint to which the socket will be
+   * connected. Copies will be made of the endpoint object as required.
+   *
+   * @param handler The handler to be called when the connection operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error // Result of operation
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @par Example
+   * @code
+   * void connect_handler(const asio::error_code& error)
+   * {
+   *   if (!error)
+   *   {
+   *     // Connect succeeded.
+   *   }
+   * }
+   *
+   * ...
+   *
+   * asio::ip::tcp::socket socket(io_service);
+   * asio::ip::tcp::endpoint endpoint(
+   *     asio::ip::address::from_string("1.2.3.4"), 12345);
+   * socket.async_connect(endpoint, connect_handler);
+   * @endcode
+   */
+  template <typename ConnectHandler>
+  void async_connect(const endpoint_type& peer_endpoint, ConnectHandler handler)
+  {
+    if (!is_open())
+    {
+      asio::error_code ec;
+      if (this->service.open(this->implementation,
+            peer_endpoint.protocol(), ec))
+      {
+        this->get_io_service().post(
+            asio::detail::bind_handler(handler, ec));
+        return;
+      }
+    }
+
+    this->service.async_connect(this->implementation, peer_endpoint, handler);
+  }
+
+  /// Set an option on the socket.
+  /**
+   * This function is used to set an option on the socket.
+   *
+   * @param option The new option value to be set on the socket.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa SettableSocketOption @n
+   * asio::socket_base::broadcast @n
+   * asio::socket_base::do_not_route @n
+   * asio::socket_base::keep_alive @n
+   * asio::socket_base::linger @n
+   * asio::socket_base::receive_buffer_size @n
+   * asio::socket_base::receive_low_watermark @n
+   * asio::socket_base::reuse_address @n
+   * asio::socket_base::send_buffer_size @n
+   * asio::socket_base::send_low_watermark @n
+   * asio::ip::multicast::join_group @n
+   * asio::ip::multicast::leave_group @n
+   * asio::ip::multicast::enable_loopback @n
+   * asio::ip::multicast::outbound_interface @n
+   * asio::ip::multicast::hops @n
+   * asio::ip::tcp::no_delay
+   *
+   * @par Example
+   * Setting the IPPROTO_TCP/TCP_NODELAY option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::no_delay option(true);
+   * socket.set_option(option);
+   * @endcode
+   */
+  template <typename SettableSocketOption>
+  void set_option(const SettableSocketOption& option)
+  {
+    asio::error_code ec;
+    this->service.set_option(this->implementation, option, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Set an option on the socket.
+  /**
+   * This function is used to set an option on the socket.
+   *
+   * @param option The new option value to be set on the socket.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa SettableSocketOption @n
+   * asio::socket_base::broadcast @n
+   * asio::socket_base::do_not_route @n
+   * asio::socket_base::keep_alive @n
+   * asio::socket_base::linger @n
+   * asio::socket_base::receive_buffer_size @n
+   * asio::socket_base::receive_low_watermark @n
+   * asio::socket_base::reuse_address @n
+   * asio::socket_base::send_buffer_size @n
+   * asio::socket_base::send_low_watermark @n
+   * asio::ip::multicast::join_group @n
+   * asio::ip::multicast::leave_group @n
+   * asio::ip::multicast::enable_loopback @n
+   * asio::ip::multicast::outbound_interface @n
+   * asio::ip::multicast::hops @n
+   * asio::ip::tcp::no_delay
+   *
+   * @par Example
+   * Setting the IPPROTO_TCP/TCP_NODELAY option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::no_delay option(true);
+   * asio::error_code ec;
+   * socket.set_option(option, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  template <typename SettableSocketOption>
+  asio::error_code set_option(const SettableSocketOption& option,
+      asio::error_code& ec)
+  {
+    return this->service.set_option(this->implementation, option, ec);
+  }
+
+  /// Get an option from the socket.
+  /**
+   * This function is used to get the current value of an option on the socket.
+   *
+   * @param option The option value to be obtained from the socket.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa GettableSocketOption @n
+   * asio::socket_base::broadcast @n
+   * asio::socket_base::do_not_route @n
+   * asio::socket_base::keep_alive @n
+   * asio::socket_base::linger @n
+   * asio::socket_base::receive_buffer_size @n
+   * asio::socket_base::receive_low_watermark @n
+   * asio::socket_base::reuse_address @n
+   * asio::socket_base::send_buffer_size @n
+   * asio::socket_base::send_low_watermark @n
+   * asio::ip::multicast::join_group @n
+   * asio::ip::multicast::leave_group @n
+   * asio::ip::multicast::enable_loopback @n
+   * asio::ip::multicast::outbound_interface @n
+   * asio::ip::multicast::hops @n
+   * asio::ip::tcp::no_delay
+   *
+   * @par Example
+   * Getting the value of the SOL_SOCKET/SO_KEEPALIVE option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::socket::keep_alive option;
+   * socket.get_option(option);
+   * bool is_set = option.get();
+   * @endcode
+   */
+  template <typename GettableSocketOption>
+  void get_option(GettableSocketOption& option) const
+  {
+    asio::error_code ec;
+    this->service.get_option(this->implementation, option, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Get an option from the socket.
+  /**
+   * This function is used to get the current value of an option on the socket.
+   *
+   * @param option The option value to be obtained from the socket.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa GettableSocketOption @n
+   * asio::socket_base::broadcast @n
+   * asio::socket_base::do_not_route @n
+   * asio::socket_base::keep_alive @n
+   * asio::socket_base::linger @n
+   * asio::socket_base::receive_buffer_size @n
+   * asio::socket_base::receive_low_watermark @n
+   * asio::socket_base::reuse_address @n
+   * asio::socket_base::send_buffer_size @n
+   * asio::socket_base::send_low_watermark @n
+   * asio::ip::multicast::join_group @n
+   * asio::ip::multicast::leave_group @n
+   * asio::ip::multicast::enable_loopback @n
+   * asio::ip::multicast::outbound_interface @n
+   * asio::ip::multicast::hops @n
+   * asio::ip::tcp::no_delay
+   *
+   * @par Example
+   * Getting the value of the SOL_SOCKET/SO_KEEPALIVE option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::socket::keep_alive option;
+   * asio::error_code ec;
+   * socket.get_option(option, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * bool is_set = option.get();
+   * @endcode
+   */
+  template <typename GettableSocketOption>
+  asio::error_code get_option(GettableSocketOption& option,
+      asio::error_code& ec) const
+  {
+    return this->service.get_option(this->implementation, option, ec);
+  }
+
+  /// Perform an IO control command on the socket.
+  /**
+   * This function is used to execute an IO control command on the socket.
+   *
+   * @param command The IO control command to be performed on the socket.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa IoControlCommand @n
+   * asio::socket_base::bytes_readable @n
+   * asio::socket_base::non_blocking_io
+   *
+   * @par Example
+   * Getting the number of bytes ready to read:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::socket::bytes_readable command;
+   * socket.io_control(command);
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   */
+  template <typename IoControlCommand>
+  void io_control(IoControlCommand& command)
+  {
+    asio::error_code ec;
+    this->service.io_control(this->implementation, command, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Perform an IO control command on the socket.
+  /**
+   * This function is used to execute an IO control command on the socket.
+   *
+   * @param command The IO control command to be performed on the socket.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa IoControlCommand @n
+   * asio::socket_base::bytes_readable @n
+   * asio::socket_base::non_blocking_io
+   *
+   * @par Example
+   * Getting the number of bytes ready to read:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::socket::bytes_readable command;
+   * asio::error_code ec;
+   * socket.io_control(command, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   */
+  template <typename IoControlCommand>
+  asio::error_code io_control(IoControlCommand& command,
+      asio::error_code& ec)
+  {
+    return this->service.io_control(this->implementation, command, ec);
+  }
+
+  /// Get the local endpoint of the socket.
+  /**
+   * This function is used to obtain the locally bound endpoint of the socket.
+   *
+   * @returns An object that represents the local endpoint of the socket.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::endpoint endpoint = socket.local_endpoint();
+   * @endcode
+   */
+  endpoint_type local_endpoint() const
+  {
+    asio::error_code ec;
+    endpoint_type ep = this->service.local_endpoint(this->implementation, ec);
+    asio::detail::throw_error(ec);
+    return ep;
+  }
+
+  /// Get the local endpoint of the socket.
+  /**
+   * This function is used to obtain the locally bound endpoint of the socket.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns An object that represents the local endpoint of the socket.
+   * Returns a default-constructed endpoint object if an error occurred.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::error_code ec;
+   * asio::ip::tcp::endpoint endpoint = socket.local_endpoint(ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  endpoint_type local_endpoint(asio::error_code& ec) const
+  {
+    return this->service.local_endpoint(this->implementation, ec);
+  }
+
+  /// Get the remote endpoint of the socket.
+  /**
+   * This function is used to obtain the remote endpoint of the socket.
+   *
+   * @returns An object that represents the remote endpoint of the socket.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::ip::tcp::endpoint endpoint = socket.remote_endpoint();
+   * @endcode
+   */
+  endpoint_type remote_endpoint() const
+  {
+    asio::error_code ec;
+    endpoint_type ep = this->service.remote_endpoint(this->implementation, ec);
+    asio::detail::throw_error(ec);
+    return ep;
+  }
+
+  /// Get the remote endpoint of the socket.
+  /**
+   * This function is used to obtain the remote endpoint of the socket.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns An object that represents the remote endpoint of the socket.
+   * Returns a default-constructed endpoint object if an error occurred.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::error_code ec;
+   * asio::ip::tcp::endpoint endpoint = socket.remote_endpoint(ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  endpoint_type remote_endpoint(asio::error_code& ec) const
+  {
+    return this->service.remote_endpoint(this->implementation, ec);
+  }
+
+  /// Disable sends or receives on the socket.
+  /**
+   * This function is used to disable send operations, receive operations, or
+   * both.
+   *
+   * @param what Determines what types of operation will no longer be allowed.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * Shutting down the send side of the socket:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * socket.shutdown(asio::ip::tcp::socket::shutdown_send);
+   * @endcode
+   */
+  void shutdown(shutdown_type what)
+  {
+    asio::error_code ec;
+    this->service.shutdown(this->implementation, what, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Disable sends or receives on the socket.
+  /**
+   * This function is used to disable send operations, receive operations, or
+   * both.
+   *
+   * @param what Determines what types of operation will no longer be allowed.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * Shutting down the send side of the socket:
+   * @code
+   * asio::ip::tcp::socket socket(io_service);
+   * ...
+   * asio::error_code ec;
+   * socket.shutdown(asio::ip::tcp::socket::shutdown_send, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code shutdown(shutdown_type what,
+      asio::error_code& ec)
+  {
+    return this->service.shutdown(this->implementation, what, ec);
+  }
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~basic_socket()
+  {
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_SOCKET_HPP
diff --git a/ext/asio/basic_socket_acceptor.hpp b/ext/asio/basic_socket_acceptor.hpp
new file mode 100644
index 0000000000..97fa56b776
--- /dev/null
+++ b/ext/asio/basic_socket_acceptor.hpp
@@ -0,0 +1,824 @@
+//
+// basic_socket_acceptor.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_SOCKET_ACCEPTOR_HPP
+#define ASIO_BASIC_SOCKET_ACCEPTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_io_object.hpp"
+#include "asio/basic_socket.hpp"
+#include "asio/error.hpp"
+#include "asio/socket_acceptor_service.hpp"
+#include "asio/socket_base.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+/// Provides the ability to accept new connections.
+/**
+ * The basic_socket_acceptor class template is used for accepting new socket
+ * connections.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Example
+ * Opening a socket acceptor with the SO_REUSEADDR option enabled:
+ * @code
+ * asio::ip::tcp::acceptor acceptor(io_service);
+ * asio::ip::tcp::endpoint endpoint(asio::ip::tcp::v4(), port);
+ * acceptor.open(endpoint.protocol());
+ * acceptor.set_option(asio::ip::tcp::acceptor::reuse_address(true));
+ * acceptor.bind(endpoint);
+ * acceptor.listen();
+ * @endcode
+ */
+template <typename Protocol,
+    typename SocketAcceptorService = socket_acceptor_service<Protocol> >
+class basic_socket_acceptor
+  : public basic_io_object<SocketAcceptorService>,
+    public socket_base
+{
+public:
+  /// The native representation of an acceptor.
+  typedef typename SocketAcceptorService::native_type native_type;
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  /// Construct an acceptor without opening it.
+  /**
+   * This constructor creates an acceptor without opening it to listen for new
+   * connections. The open() function must be called before the acceptor can
+   * accept new socket connections.
+   *
+   * @param io_service The io_service object that the acceptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * acceptor.
+   */
+  explicit basic_socket_acceptor(asio::io_service& io_service)
+    : basic_io_object<SocketAcceptorService>(io_service)
+  {
+  }
+
+  /// Construct an open acceptor.
+  /**
+   * This constructor creates an acceptor and automatically opens it.
+   *
+   * @param io_service The io_service object that the acceptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * acceptor.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_socket_acceptor(asio::io_service& io_service,
+      const protocol_type& protocol)
+    : basic_io_object<SocketAcceptorService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, protocol, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Construct an acceptor opened on the given endpoint.
+  /**
+   * This constructor creates an acceptor and automatically opens it to listen
+   * for new connections on the specified endpoint.
+   *
+   * @param io_service The io_service object that the acceptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * acceptor.
+   *
+   * @param endpoint An endpoint on the local machine on which the acceptor
+   * will listen for new connections.
+   *
+   * @param reuse_addr Whether the constructor should set the socket option
+   * socket_base::reuse_address.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note This constructor is equivalent to the following code:
+   * @code
+   * basic_socket_acceptor<Protocol> acceptor(io_service);
+   * acceptor.open(endpoint.protocol());
+   * if (reuse_addr)
+   *   acceptor.set_option(socket_base::reuse_address(true));
+   * acceptor.bind(endpoint);
+   * acceptor.listen(listen_backlog);
+   * @endcode
+   */
+  basic_socket_acceptor(asio::io_service& io_service,
+      const endpoint_type& endpoint, bool reuse_addr = true)
+    : basic_io_object<SocketAcceptorService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, endpoint.protocol(), ec);
+    asio::detail::throw_error(ec);
+    if (reuse_addr)
+    {
+      this->service.set_option(this->implementation,
+          socket_base::reuse_address(true), ec);
+      asio::detail::throw_error(ec);
+    }
+    this->service.bind(this->implementation, endpoint, ec);
+    asio::detail::throw_error(ec);
+    this->service.listen(this->implementation,
+        socket_base::max_connections, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Construct a basic_socket_acceptor on an existing native acceptor.
+  /**
+   * This constructor creates an acceptor object to hold an existing native
+   * acceptor.
+   *
+   * @param io_service The io_service object that the acceptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * acceptor.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @param native_acceptor A native acceptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_socket_acceptor(asio::io_service& io_service,
+      const protocol_type& protocol, const native_type& native_acceptor)
+    : basic_io_object<SocketAcceptorService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, protocol, native_acceptor, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Open the acceptor using the specified protocol.
+  /**
+   * This function opens the socket acceptor so that it will use the specified
+   * protocol.
+   *
+   * @param protocol An object specifying which protocol is to be used.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * acceptor.open(asio::ip::tcp::v4());
+   * @endcode
+   */
+  void open(const protocol_type& protocol = protocol_type())
+  {
+    asio::error_code ec;
+    this->service.open(this->implementation, protocol, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Open the acceptor using the specified protocol.
+  /**
+   * This function opens the socket acceptor so that it will use the specified
+   * protocol.
+   *
+   * @param protocol An object specifying which protocol is to be used.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * asio::error_code ec;
+   * acceptor.open(asio::ip::tcp::v4(), ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code open(const protocol_type& protocol,
+      asio::error_code& ec)
+  {
+    return this->service.open(this->implementation, protocol, ec);
+  }
+
+  /// Assigns an existing native acceptor to the acceptor.
+  /*
+   * This function opens the acceptor to hold an existing native acceptor.
+   *
+   * @param protocol An object specifying which protocol is to be used.
+   *
+   * @param native_acceptor A native acceptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void assign(const protocol_type& protocol, const native_type& native_acceptor)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, protocol, native_acceptor, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Assigns an existing native acceptor to the acceptor.
+  /*
+   * This function opens the acceptor to hold an existing native acceptor.
+   *
+   * @param protocol An object specifying which protocol is to be used.
+   *
+   * @param native_acceptor A native acceptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code assign(const protocol_type& protocol,
+      const native_type& native_acceptor, asio::error_code& ec)
+  {
+    return this->service.assign(this->implementation,
+        protocol, native_acceptor, ec);
+  }
+
+  /// Determine whether the acceptor is open.
+  bool is_open() const
+  {
+    return this->service.is_open(this->implementation);
+  }
+
+  /// Bind the acceptor to the given local endpoint.
+  /**
+   * This function binds the socket acceptor to the specified endpoint on the
+   * local machine.
+   *
+   * @param endpoint An endpoint on the local machine to which the socket
+   * acceptor will be bound.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * acceptor.open(asio::ip::tcp::v4());
+   * acceptor.bind(asio::ip::tcp::endpoint(12345));
+   * @endcode
+   */
+  void bind(const endpoint_type& endpoint)
+  {
+    asio::error_code ec;
+    this->service.bind(this->implementation, endpoint, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Bind the acceptor to the given local endpoint.
+  /**
+   * This function binds the socket acceptor to the specified endpoint on the
+   * local machine.
+   *
+   * @param endpoint An endpoint on the local machine to which the socket
+   * acceptor will be bound.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * acceptor.open(asio::ip::tcp::v4());
+   * asio::error_code ec;
+   * acceptor.bind(asio::ip::tcp::endpoint(12345), ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code bind(const endpoint_type& endpoint,
+      asio::error_code& ec)
+  {
+    return this->service.bind(this->implementation, endpoint, ec);
+  }
+
+  /// Place the acceptor into the state where it will listen for new
+  /// connections.
+  /**
+   * This function puts the socket acceptor into the state where it may accept
+   * new connections.
+   *
+   * @param backlog The maximum length of the queue of pending connections.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void listen(int backlog = socket_base::max_connections)
+  {
+    asio::error_code ec;
+    this->service.listen(this->implementation, backlog, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Place the acceptor into the state where it will listen for new
+  /// connections.
+  /**
+   * This function puts the socket acceptor into the state where it may accept
+   * new connections.
+   *
+   * @param backlog The maximum length of the queue of pending connections.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::error_code ec;
+   * acceptor.listen(asio::socket_base::max_connections, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code listen(int backlog, asio::error_code& ec)
+  {
+    return this->service.listen(this->implementation, backlog, ec);
+  }
+
+  /// Close the acceptor.
+  /**
+   * This function is used to close the acceptor. Any asynchronous accept
+   * operations will be cancelled immediately.
+   *
+   * A subsequent call to open() is required before the acceptor can again be
+   * used to again perform socket accept operations.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void close()
+  {
+    asio::error_code ec;
+    this->service.close(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Close the acceptor.
+  /**
+   * This function is used to close the acceptor. Any asynchronous accept
+   * operations will be cancelled immediately.
+   *
+   * A subsequent call to open() is required before the acceptor can again be
+   * used to again perform socket accept operations.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::error_code ec;
+   * acceptor.close(ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  asio::error_code close(asio::error_code& ec)
+  {
+    return this->service.close(this->implementation, ec);
+  }
+
+  /// Get the native acceptor representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * acceptor. This is intended to allow access to native acceptor functionality
+   * that is not otherwise provided.
+   */
+  native_type native()
+  {
+    return this->service.native(this->implementation);
+  }
+
+  /// Cancel all asynchronous operations associated with the acceptor.
+  /**
+   * This function causes all outstanding asynchronous connect, send and receive
+   * operations to finish immediately, and the handlers for cancelled operations
+   * will be passed the asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void cancel()
+  {
+    asio::error_code ec;
+    this->service.cancel(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Cancel all asynchronous operations associated with the acceptor.
+  /**
+   * This function causes all outstanding asynchronous connect, send and receive
+   * operations to finish immediately, and the handlers for cancelled operations
+   * will be passed the asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code cancel(asio::error_code& ec)
+  {
+    return this->service.cancel(this->implementation, ec);
+  }
+
+  /// Set an option on the acceptor.
+  /**
+   * This function is used to set an option on the acceptor.
+   *
+   * @param option The new option value to be set on the acceptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa SettableSocketOption @n
+   * asio::socket_base::reuse_address
+   * asio::socket_base::enable_connection_aborted
+   *
+   * @par Example
+   * Setting the SOL_SOCKET/SO_REUSEADDR option:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::acceptor::reuse_address option(true);
+   * acceptor.set_option(option);
+   * @endcode
+   */
+  template <typename SettableSocketOption>
+  void set_option(const SettableSocketOption& option)
+  {
+    asio::error_code ec;
+    this->service.set_option(this->implementation, option, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Set an option on the acceptor.
+  /**
+   * This function is used to set an option on the acceptor.
+   *
+   * @param option The new option value to be set on the acceptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa SettableSocketOption @n
+   * asio::socket_base::reuse_address
+   * asio::socket_base::enable_connection_aborted
+   *
+   * @par Example
+   * Setting the SOL_SOCKET/SO_REUSEADDR option:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::acceptor::reuse_address option(true);
+   * asio::error_code ec;
+   * acceptor.set_option(option, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  template <typename SettableSocketOption>
+  asio::error_code set_option(const SettableSocketOption& option,
+      asio::error_code& ec)
+  {
+    return this->service.set_option(this->implementation, option, ec);
+  }
+
+  /// Get an option from the acceptor.
+  /**
+   * This function is used to get the current value of an option on the
+   * acceptor.
+   *
+   * @param option The option value to be obtained from the acceptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa GettableSocketOption @n
+   * asio::socket_base::reuse_address
+   *
+   * @par Example
+   * Getting the value of the SOL_SOCKET/SO_REUSEADDR option:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::acceptor::reuse_address option;
+   * acceptor.get_option(option);
+   * bool is_set = option.get();
+   * @endcode
+   */
+  template <typename GettableSocketOption>
+  void get_option(GettableSocketOption& option)
+  {
+    asio::error_code ec;
+    this->service.get_option(this->implementation, option, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Get an option from the acceptor.
+  /**
+   * This function is used to get the current value of an option on the
+   * acceptor.
+   *
+   * @param option The option value to be obtained from the acceptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa GettableSocketOption @n
+   * asio::socket_base::reuse_address
+   *
+   * @par Example
+   * Getting the value of the SOL_SOCKET/SO_REUSEADDR option:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::acceptor::reuse_address option;
+   * asio::error_code ec;
+   * acceptor.get_option(option, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * bool is_set = option.get();
+   * @endcode
+   */
+  template <typename GettableSocketOption>
+  asio::error_code get_option(GettableSocketOption& option,
+      asio::error_code& ec)
+  {
+    return this->service.get_option(this->implementation, option, ec);
+  }
+
+  /// Get the local endpoint of the acceptor.
+  /**
+   * This function is used to obtain the locally bound endpoint of the acceptor.
+   *
+   * @returns An object that represents the local endpoint of the acceptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::endpoint endpoint = acceptor.local_endpoint();
+   * @endcode
+   */
+  endpoint_type local_endpoint() const
+  {
+    asio::error_code ec;
+    endpoint_type ep = this->service.local_endpoint(this->implementation, ec);
+    asio::detail::throw_error(ec);
+    return ep;
+  }
+
+  /// Get the local endpoint of the acceptor.
+  /**
+   * This function is used to obtain the locally bound endpoint of the acceptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns An object that represents the local endpoint of the acceptor.
+   * Returns a default-constructed endpoint object if an error occurred and the
+   * error handler did not throw an exception.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::error_code ec;
+   * asio::ip::tcp::endpoint endpoint = acceptor.local_endpoint(ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  endpoint_type local_endpoint(asio::error_code& ec) const
+  {
+    return this->service.local_endpoint(this->implementation, ec);
+  }
+
+  /// Accept a new connection.
+  /**
+   * This function is used to accept a new connection from a peer into the
+   * given socket. The function call will block until a new connection has been
+   * accepted successfully or an error occurs.
+   *
+   * @param peer The socket into which the new connection will be accepted.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::socket socket(io_service);
+   * acceptor.accept(socket);
+   * @endcode
+   */
+  template <typename SocketService>
+  void accept(basic_socket<protocol_type, SocketService>& peer)
+  {
+    asio::error_code ec;
+    this->service.accept(this->implementation, peer, 0, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Accept a new connection.
+  /**
+   * This function is used to accept a new connection from a peer into the
+   * given socket. The function call will block until a new connection has been
+   * accepted successfully or an error occurs.
+   *
+   * @param peer The socket into which the new connection will be accepted.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::soocket socket(io_service);
+   * asio::error_code ec;
+   * acceptor.accept(socket, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  template <typename SocketService>
+  asio::error_code accept(
+      basic_socket<protocol_type, SocketService>& peer,
+      asio::error_code& ec)
+  {
+    return this->service.accept(this->implementation, peer, 0, ec);
+  }
+
+  /// Start an asynchronous accept.
+  /**
+   * This function is used to asynchronously accept a new connection into a
+   * socket. The function call always returns immediately.
+   *
+   * @param peer The socket into which the new connection will be accepted.
+   * Ownership of the peer object is retained by the caller, which must
+   * guarantee that it is valid until the handler is called.
+   *
+   * @param handler The handler to be called when the accept operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error // Result of operation.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @par Example
+   * @code
+   * void accept_handler(const asio::error_code& error)
+   * {
+   *   if (!error)
+   *   {
+   *     // Accept succeeded.
+   *   }
+   * }
+   *
+   * ...
+   *
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::socket socket(io_service);
+   * acceptor.async_accept(socket, accept_handler);
+   * @endcode
+   */
+  template <typename SocketService, typename AcceptHandler>
+  void async_accept(basic_socket<protocol_type, SocketService>& peer,
+      AcceptHandler handler)
+  {
+    this->service.async_accept(this->implementation, peer, 0, handler);
+  }
+
+  /// Accept a new connection and obtain the endpoint of the peer
+  /**
+   * This function is used to accept a new connection from a peer into the
+   * given socket, and additionally provide the endpoint of the remote peer.
+   * The function call will block until a new connection has been accepted
+   * successfully or an error occurs.
+   *
+   * @param peer The socket into which the new connection will be accepted.
+   *
+   * @param peer_endpoint An endpoint object which will receive the endpoint of
+   * the remote peer.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::socket socket(io_service);
+   * asio::ip::tcp::endpoint endpoint;
+   * acceptor.accept(socket, endpoint);
+   * @endcode
+   */
+  template <typename SocketService>
+  void accept(basic_socket<protocol_type, SocketService>& peer,
+      endpoint_type& peer_endpoint)
+  {
+    asio::error_code ec;
+    this->service.accept(this->implementation, peer, &peer_endpoint, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Accept a new connection and obtain the endpoint of the peer
+  /**
+   * This function is used to accept a new connection from a peer into the
+   * given socket, and additionally provide the endpoint of the remote peer.
+   * The function call will block until a new connection has been accepted
+   * successfully or an error occurs.
+   *
+   * @param peer The socket into which the new connection will be accepted.
+   *
+   * @param peer_endpoint An endpoint object which will receive the endpoint of
+   * the remote peer.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service);
+   * ...
+   * asio::ip::tcp::socket socket(io_service);
+   * asio::ip::tcp::endpoint endpoint;
+   * asio::error_code ec;
+   * acceptor.accept(socket, endpoint, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * @endcode
+   */
+  template <typename SocketService>
+  asio::error_code accept(
+      basic_socket<protocol_type, SocketService>& peer,
+      endpoint_type& peer_endpoint, asio::error_code& ec)
+  {
+    return this->service.accept(this->implementation, peer, &peer_endpoint, ec);
+  }
+
+  /// Start an asynchronous accept.
+  /**
+   * This function is used to asynchronously accept a new connection into a
+   * socket, and additionally obtain the endpoint of the remote peer. The
+   * function call always returns immediately.
+   *
+   * @param peer The socket into which the new connection will be accepted.
+   * Ownership of the peer object is retained by the caller, which must
+   * guarantee that it is valid until the handler is called.
+   *
+   * @param peer_endpoint An endpoint object into which the endpoint of the
+   * remote peer will be written. Ownership of the peer_endpoint object is
+   * retained by the caller, which must guarantee that it is valid until the
+   * handler is called.
+   *
+   * @param handler The handler to be called when the accept operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error // Result of operation.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   */
+  template <typename SocketService, typename AcceptHandler>
+  void async_accept(basic_socket<protocol_type, SocketService>& peer,
+      endpoint_type& peer_endpoint, AcceptHandler handler)
+  {
+    this->service.async_accept(this->implementation,
+        peer, &peer_endpoint, handler);
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_SOCKET_ACCEPTOR_HPP
diff --git a/ext/asio/basic_socket_iostream.hpp b/ext/asio/basic_socket_iostream.hpp
new file mode 100644
index 0000000000..361ecb82cd
--- /dev/null
+++ b/ext/asio/basic_socket_iostream.hpp
@@ -0,0 +1,156 @@
+//
+// basic_socket_iostream.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_SOCKET_IOSTREAM_HPP
+#define ASIO_BASIC_SOCKET_IOSTREAM_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/preprocessor/arithmetic/inc.hpp>
+#include <boost/preprocessor/repetition/enum_binary_params.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/repeat_from_to.hpp>
+#include <boost/utility/base_from_member.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_socket_streambuf.hpp"
+#include "asio/stream_socket_service.hpp"
+
+#if !defined(ASIO_SOCKET_IOSTREAM_MAX_ARITY)
+#define ASIO_SOCKET_IOSTREAM_MAX_ARITY 5
+#endif // !defined(ASIO_SOCKET_IOSTREAM_MAX_ARITY)
+
+// A macro that should expand to:
+//   template <typename T1, ..., typename Tn>
+//   explicit basic_socket_iostream(T1 x1, ..., Tn xn)
+//     : basic_iostream<char>(&this->boost::base_from_member<
+//         basic_socket_streambuf<Protocol, StreamSocketService> >::member)
+//   {
+//     if (rdbuf()->connect(x1, ..., xn) == 0)
+//       this->setstate(std::ios_base::failbit);
+//   }
+// This macro should only persist within this file.
+
+#define ASIO_PRIVATE_CTR_DEF(z, n, data) \
+  template <BOOST_PP_ENUM_PARAMS(n, typename T)> \
+  explicit basic_socket_iostream(BOOST_PP_ENUM_BINARY_PARAMS(n, T, x)) \
+    : std::basic_iostream<char>(&this->boost::base_from_member< \
+        basic_socket_streambuf<Protocol, StreamSocketService> >::member) \
+  { \
+    tie(this); \
+    if (rdbuf()->connect(BOOST_PP_ENUM_PARAMS(n, x)) == 0) \
+      this->setstate(std::ios_base::failbit); \
+  } \
+  /**/
+
+// A macro that should expand to:
+//   template <typename T1, ..., typename Tn>
+//   void connect(T1 x1, ..., Tn xn)
+//   {
+//     if (rdbuf()->connect(x1, ..., xn) == 0)
+//       this->setstate(std::ios_base::failbit);
+//   }
+// This macro should only persist within this file.
+
+#define ASIO_PRIVATE_CONNECT_DEF(z, n, data) \
+  template <BOOST_PP_ENUM_PARAMS(n, typename T)> \
+  void connect(BOOST_PP_ENUM_BINARY_PARAMS(n, T, x)) \
+  { \
+    if (rdbuf()->connect(BOOST_PP_ENUM_PARAMS(n, x)) == 0) \
+      this->setstate(std::ios_base::failbit); \
+  } \
+  /**/
+
+namespace asio {
+
+/// Iostream interface for a socket.
+template <typename Protocol,
+    typename StreamSocketService = stream_socket_service<Protocol> >
+class basic_socket_iostream
+  : public boost::base_from_member<
+      basic_socket_streambuf<Protocol, StreamSocketService> >,
+    public std::basic_iostream<char>
+{
+public:
+  /// Construct a basic_socket_iostream without establishing a connection.
+  basic_socket_iostream()
+    : std::basic_iostream<char>(&this->boost::base_from_member<
+        basic_socket_streambuf<Protocol, StreamSocketService> >::member)
+  {
+    tie(this);
+  }
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// Establish a connection to an endpoint corresponding to a resolver query.
+  /**
+   * This constructor automatically establishes a connection based on the
+   * supplied resolver query parameters. The arguments are used to construct
+   * a resolver query object.
+   */
+  template <typename T1, ..., typename TN>
+  explicit basic_socket_iostream(T1 t1, ..., TN tn);
+#else
+  BOOST_PP_REPEAT_FROM_TO(
+      1, BOOST_PP_INC(ASIO_SOCKET_IOSTREAM_MAX_ARITY),
+      ASIO_PRIVATE_CTR_DEF, _ )
+#endif
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// Establish a connection to an endpoint corresponding to a resolver query.
+  /**
+   * This function automatically establishes a connection based on the supplied
+   * resolver query parameters. The arguments are used to construct a resolver
+   * query object.
+   */
+  template <typename T1, ..., typename TN>
+  void connect(T1 t1, ..., TN tn);
+#else
+  BOOST_PP_REPEAT_FROM_TO(
+      1, BOOST_PP_INC(ASIO_SOCKET_IOSTREAM_MAX_ARITY),
+      ASIO_PRIVATE_CONNECT_DEF, _ )
+#endif
+
+  /// Close the connection.
+  void close()
+  {
+    if (rdbuf()->close() == 0)
+      this->setstate(std::ios_base::failbit);
+  }
+
+  /// Return a pointer to the underlying streambuf.
+  basic_socket_streambuf<Protocol, StreamSocketService>* rdbuf() const
+  {
+    return const_cast<basic_socket_streambuf<Protocol, StreamSocketService>*>(
+        &this->boost::base_from_member<
+          basic_socket_streambuf<Protocol, StreamSocketService> >::member);
+  }
+};
+
+} // namespace asio
+
+#undef ASIO_PRIVATE_CTR_DEF
+#undef ASIO_PRIVATE_CONNECT_DEF
+
+#endif // defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_SOCKET_IOSTREAM_HPP
diff --git a/ext/asio/basic_socket_streambuf.hpp b/ext/asio/basic_socket_streambuf.hpp
new file mode 100644
index 0000000000..ae0264e3ea
--- /dev/null
+++ b/ext/asio/basic_socket_streambuf.hpp
@@ -0,0 +1,295 @@
+//
+// basic_socket_streambuf.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_SOCKET_STREAMBUF_HPP
+#define ASIO_BASIC_SOCKET_STREAMBUF_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/push_options.hpp"
+#include <streambuf>
+#include <boost/array.hpp>
+#include <boost/preprocessor/arithmetic/inc.hpp>
+#include <boost/preprocessor/repetition/enum_binary_params.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/repeat_from_to.hpp>
+#include <boost/utility/base_from_member.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_socket.hpp"
+#include "asio/io_service.hpp"
+#include "asio/stream_socket_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if !defined(ASIO_SOCKET_STREAMBUF_MAX_ARITY)
+#define ASIO_SOCKET_STREAMBUF_MAX_ARITY 5
+#endif // !defined(ASIO_SOCKET_STREAMBUF_MAX_ARITY)
+
+// A macro that should expand to:
+//   template <typename T1, ..., typename Tn>
+//   basic_socket_streambuf<Protocol, StreamSocketService>* connect(
+//       T1 x1, ..., Tn xn)
+//   {
+//     init_buffers();
+//     asio::error_code ec;
+//     this->basic_socket<Protocol, StreamSocketService>::close(ec);
+//     typedef typename Protocol::resolver resolver_type;
+//     typedef typename resolver_type::query resolver_query;
+//     resolver_query query(x1, ..., xn);
+//     resolve_and_connect(query, ec);
+//     return !ec ? this : 0;
+//   }
+// This macro should only persist within this file.
+
+#define ASIO_PRIVATE_CONNECT_DEF( z, n, data ) \
+  template <BOOST_PP_ENUM_PARAMS(n, typename T)> \
+  basic_socket_streambuf<Protocol, StreamSocketService>* connect( \
+      BOOST_PP_ENUM_BINARY_PARAMS(n, T, x)) \
+  { \
+    init_buffers(); \
+    asio::error_code ec; \
+    this->basic_socket<Protocol, StreamSocketService>::close(ec); \
+    typedef typename Protocol::resolver resolver_type; \
+    typedef typename resolver_type::query resolver_query; \
+    resolver_query query(BOOST_PP_ENUM_PARAMS(n, x)); \
+    resolve_and_connect(query, ec); \
+    return !ec ? this : 0; \
+  } \
+  /**/
+
+namespace asio {
+
+/// Iostream streambuf for a socket.
+template <typename Protocol,
+    typename StreamSocketService = stream_socket_service<Protocol> >
+class basic_socket_streambuf
+  : public std::streambuf,
+    private boost::base_from_member<io_service>,
+    public basic_socket<Protocol, StreamSocketService>
+{
+public:
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  /// Construct a basic_socket_streambuf without establishing a connection.
+  basic_socket_streambuf()
+    : basic_socket<Protocol, StreamSocketService>(
+        boost::base_from_member<asio::io_service>::member),
+      unbuffered_(false)
+  {
+    init_buffers();
+  }
+
+  /// Destructor flushes buffered data.
+  virtual ~basic_socket_streambuf()
+  {
+    if (pptr() != pbase())
+      overflow(traits_type::eof());
+  }
+
+  /// Establish a connection.
+  /**
+   * This function establishes a connection to the specified endpoint.
+   *
+   * @return \c this if a connection was successfully established, a null
+   * pointer otherwise.
+   */
+  basic_socket_streambuf<Protocol, StreamSocketService>* connect(
+      const endpoint_type& endpoint)
+  {
+    init_buffers();
+    asio::error_code ec;
+    this->basic_socket<Protocol, StreamSocketService>::close(ec);
+    this->basic_socket<Protocol, StreamSocketService>::connect(endpoint, ec);
+    return !ec ? this : 0;
+  }
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// Establish a connection.
+  /**
+   * This function automatically establishes a connection based on the supplied
+   * resolver query parameters. The arguments are used to construct a resolver
+   * query object.
+   *
+   * @return \c this if a connection was successfully established, a null
+   * pointer otherwise.
+   */
+  template <typename T1, ..., typename TN>
+  basic_socket_streambuf<Protocol, StreamSocketService>* connect(
+      T1 t1, ..., TN tn);
+#else
+  BOOST_PP_REPEAT_FROM_TO(
+      1, BOOST_PP_INC(ASIO_SOCKET_STREAMBUF_MAX_ARITY),
+      ASIO_PRIVATE_CONNECT_DEF, _ )
+#endif
+
+  /// Close the connection.
+  /**
+   * @return \c this if a connection was successfully established, a null
+   * pointer otherwise.
+   */
+  basic_socket_streambuf<Protocol, StreamSocketService>* close()
+  {
+    asio::error_code ec;
+    sync();
+    this->basic_socket<Protocol, StreamSocketService>::close(ec);
+    if (!ec)
+      init_buffers();
+    return !ec ? this : 0;
+  }
+
+protected:
+  int_type underflow()
+  {
+    if (gptr() == egptr())
+    {
+      asio::error_code ec;
+      std::size_t bytes_transferred = this->service.receive(
+          this->implementation,
+          asio::buffer(asio::buffer(get_buffer_) + putback_max),
+          0, ec);
+      if (ec)
+        return traits_type::eof();
+      setg(get_buffer_.begin(), get_buffer_.begin() + putback_max,
+          get_buffer_.begin() + putback_max + bytes_transferred);
+      return traits_type::to_int_type(*gptr());
+    }
+    else
+    {
+      return traits_type::eof();
+    }
+  }
+
+  int_type overflow(int_type c)
+  {
+    if (unbuffered_)
+    {
+      if (traits_type::eq_int_type(c, traits_type::eof()))
+      {
+        // Nothing to do.
+        return traits_type::not_eof(c);
+      }
+      else
+      {
+        // Send the single character immediately.
+        asio::error_code ec;
+        char_type ch = traits_type::to_char_type(c);
+        this->service.send(this->implementation,
+            asio::buffer(&ch, sizeof(char_type)), 0, ec);
+        if (ec)
+          return traits_type::eof();
+        return c;
+      }
+    }
+    else
+    {
+      // Send all data in the output buffer.
+      asio::const_buffer buffer =
+        asio::buffer(pbase(), pptr() - pbase());
+      while (asio::buffer_size(buffer) > 0)
+      {
+        asio::error_code ec;
+        std::size_t bytes_transferred = this->service.send(
+            this->implementation, asio::buffer(buffer),
+            0, ec);
+        if (ec)
+          return traits_type::eof();
+        buffer = buffer + bytes_transferred;
+      }
+      setp(put_buffer_.begin(), put_buffer_.end());
+
+      // If the new character is eof then our work here is done.
+      if (traits_type::eq_int_type(c, traits_type::eof()))
+        return traits_type::not_eof(c);
+
+      // Add the new character to the output buffer.
+      *pptr() = traits_type::to_char_type(c);
+      pbump(1);
+      return c;
+    }
+  }
+
+  int sync()
+  {
+    return overflow(traits_type::eof());
+  }
+
+  std::streambuf* setbuf(char_type* s, std::streamsize n)
+  {
+    if (pptr() == pbase() && s == 0 && n == 0)
+    {
+      unbuffered_ = true;
+      setp(0, 0);
+      return this;
+    }
+
+    return 0;
+  }
+
+private:
+  void init_buffers()
+  {
+    setg(get_buffer_.begin(),
+        get_buffer_.begin() + putback_max,
+        get_buffer_.begin() + putback_max);
+    if (unbuffered_)
+      setp(0, 0);
+    else
+      setp(put_buffer_.begin(), put_buffer_.end());
+  }
+
+  template <typename ResolverQuery>
+  void resolve_and_connect(const ResolverQuery& query,
+      asio::error_code& ec)
+  {
+    typedef typename Protocol::resolver resolver_type;
+    typedef typename resolver_type::iterator iterator_type;
+    resolver_type resolver(
+        boost::base_from_member<asio::io_service>::member);
+    iterator_type i = resolver.resolve(query, ec);
+    if (!ec)
+    {
+      iterator_type end;
+      ec = asio::error::host_not_found;
+      while (ec && i != end)
+      {
+        this->basic_socket<Protocol, StreamSocketService>::close();
+        this->basic_socket<Protocol, StreamSocketService>::connect(*i, ec);
+        ++i;
+      }
+    }
+  }
+
+  enum { putback_max = 8 };
+  enum { buffer_size = 512 };
+  boost::array<char, buffer_size> get_buffer_;
+  boost::array<char, buffer_size> put_buffer_;
+  bool unbuffered_;
+};
+
+} // namespace asio
+
+#undef ASIO_PRIVATE_CONNECT_DEF
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_SOCKET_STREAMBUF_HPP
diff --git a/ext/asio/basic_stream_socket.hpp b/ext/asio/basic_stream_socket.hpp
new file mode 100644
index 0000000000..b7b4f065fa
--- /dev/null
+++ b/ext/asio/basic_stream_socket.hpp
@@ -0,0 +1,718 @@
+//
+// basic_stream_socket.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_STREAM_SOCKET_HPP
+#define ASIO_BASIC_STREAM_SOCKET_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_socket.hpp"
+#include "asio/error.hpp"
+#include "asio/stream_socket_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+/// Provides stream-oriented socket functionality.
+/**
+ * The basic_stream_socket class template provides asynchronous and blocking
+ * stream-oriented socket functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
+ */
+template <typename Protocol,
+    typename StreamSocketService = stream_socket_service<Protocol> >
+class basic_stream_socket
+  : public basic_socket<Protocol, StreamSocketService>
+{
+public:
+  /// The native representation of a socket.
+  typedef typename StreamSocketService::native_type native_type;
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  /// Construct a basic_stream_socket without opening it.
+  /**
+   * This constructor creates a stream socket without opening it. The socket
+   * needs to be opened and then connected or accepted before data can be sent
+   * or received on it.
+   *
+   * @param io_service The io_service object that the stream socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   */
+  explicit basic_stream_socket(asio::io_service& io_service)
+    : basic_socket<Protocol, StreamSocketService>(io_service)
+  {
+  }
+
+  /// Construct and open a basic_stream_socket.
+  /**
+   * This constructor creates and opens a stream socket. The socket needs to be
+   * connected or accepted before data can be sent or received on it.
+   *
+   * @param io_service The io_service object that the stream socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_stream_socket(asio::io_service& io_service,
+      const protocol_type& protocol)
+    : basic_socket<Protocol, StreamSocketService>(io_service, protocol)
+  {
+  }
+
+  /// Construct a basic_stream_socket, opening it and binding it to the given
+  /// local endpoint.
+  /**
+   * This constructor creates a stream socket and automatically opens it bound
+   * to the specified endpoint on the local machine. The protocol used is the
+   * protocol associated with the given endpoint.
+   *
+   * @param io_service The io_service object that the stream socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   *
+   * @param endpoint An endpoint on the local machine to which the stream
+   * socket will be bound.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_stream_socket(asio::io_service& io_service,
+      const endpoint_type& endpoint)
+    : basic_socket<Protocol, StreamSocketService>(io_service, endpoint)
+  {
+  }
+
+  /// Construct a basic_stream_socket on an existing native socket.
+  /**
+   * This constructor creates a stream socket object to hold an existing native
+   * socket.
+   *
+   * @param io_service The io_service object that the stream socket will use to
+   * dispatch handlers for any asynchronous operations performed on the socket.
+   *
+   * @param protocol An object specifying protocol parameters to be used.
+   *
+   * @param native_socket The new underlying socket implementation.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_stream_socket(asio::io_service& io_service,
+      const protocol_type& protocol, const native_type& native_socket)
+    : basic_socket<Protocol, StreamSocketService>(
+        io_service, protocol, native_socket)
+  {
+  }
+
+  /// Send some data on the socket.
+  /**
+   * This function is used to send data on the stream socket. The function
+   * call will block until one or more bytes of the data has been sent
+   * successfully, or an until error occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The send operation may not transmit all of the data to the peer.
+   * Consider using the @ref write function if you need to ensure that all data
+   * is written before the blocking operation completes.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.send(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send(
+        this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send some data on the socket.
+  /**
+   * This function is used to send data on the stream socket. The function
+   * call will block until one or more bytes of the data has been sent
+   * successfully, or an until error occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @returns The number of bytes sent.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The send operation may not transmit all of the data to the peer.
+   * Consider using the @ref write function if you need to ensure that all data
+   * is written before the blocking operation completes.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.send(asio::buffer(data, size), 0);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send(
+        this->implementation, buffers, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Send some data on the socket.
+  /**
+   * This function is used to send data on the stream socket. The function
+   * call will block until one or more bytes of the data has been sent
+   * successfully, or an until error occurs.
+   *
+   * @param buffers One or more data buffers to be sent on the socket.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes sent. Returns 0 if an error occurred.
+   *
+   * @note The send operation may not transmit all of the data to the peer.
+   * Consider using the @ref write function if you need to ensure that all data
+   * is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return this->service.send(this->implementation, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  /**
+   * This function is used to asynchronously send data on the stream socket.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be sent on the socket. Although
+   * the buffers object may be copied as necessary, ownership of the underlying
+   * memory blocks is retained by the caller, which must guarantee that they
+   * remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The send operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.async_send(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    this->service.async_send(this->implementation, buffers, 0, handler);
+  }
+
+  /// Start an asynchronous send.
+  /**
+   * This function is used to asynchronously send data on the stream socket.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be sent on the socket. Although
+   * the buffers object may be copied as necessary, ownership of the underlying
+   * memory blocks is retained by the caller, which must guarantee that they
+   * remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the send call is to be made.
+   *
+   * @param handler The handler to be called when the send operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes sent.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The send operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To send a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.async_send(asio::buffer(data, size), 0, handler);
+   * @endcode
+   * See the @ref buffer documentation for information on sending multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    this->service.async_send(this->implementation, buffers, flags, handler);
+  }
+
+  /// Receive some data on the socket.
+  /**
+   * This function is used to receive data on the stream socket. The function
+   * call will block until one or more bytes of data has been received
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The receive operation may not receive all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that the
+   * requested amount of data is read before the blocking operation completes.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * socket.receive(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive(this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Receive some data on the socket.
+  /**
+   * This function is used to receive data on the stream socket. The function
+   * call will block until one or more bytes of data has been received
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @returns The number of bytes received.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The receive operation may not receive all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that the
+   * requested amount of data is read before the blocking operation completes.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * socket.receive(asio::buffer(data, size), 0);
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive(
+        this->implementation, buffers, flags, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Receive some data on a connected socket.
+  /**
+   * This function is used to receive data on the stream socket. The function
+   * call will block until one or more bytes of data has been received
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes received. Returns 0 if an error occurred.
+   *
+   * @note The receive operation may not receive all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that the
+   * requested amount of data is read before the blocking operation completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return this->service.receive(this->implementation, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous receive.
+  /**
+   * This function is used to asynchronously receive data from the stream
+   * socket. The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The receive operation may not receive all of the requested number of
+   * bytes. Consider using the @ref async_read function if you need to ensure
+   * that the requested amount of data is received before the asynchronous
+   * operation completes.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * socket.async_receive(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    this->service.async_receive(this->implementation, buffers, 0, handler);
+  }
+
+  /// Start an asynchronous receive.
+  /**
+   * This function is used to asynchronously receive data from the stream
+   * socket. The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be received.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param flags Flags specifying how the receive call is to be made.
+   *
+   * @param handler The handler to be called when the receive operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes received.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The receive operation may not receive all of the requested number of
+   * bytes. Consider using the @ref async_read function if you need to ensure
+   * that the requested amount of data is received before the asynchronous
+   * operation completes.
+   *
+   * @par Example
+   * To receive into a single data buffer use the @ref buffer function as
+   * follows:
+   * @code
+   * socket.async_receive(asio::buffer(data, size), 0, handler);
+   * @endcode
+   * See the @ref buffer documentation for information on receiving into
+   * multiple buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    this->service.async_receive(this->implementation, buffers, flags, handler);
+  }
+
+  /// Write some data to the socket.
+  /**
+   * This function is used to write data to the stream socket. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the socket.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.write_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.send(this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Write some data to the socket.
+  /**
+   * This function is used to write data to the stream socket. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the socket.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.send(this->implementation, buffers, 0, ec);
+  }
+
+  /// Start an asynchronous write.
+  /**
+   * This function is used to asynchronously write data to the stream socket.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be written to the socket.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.async_write_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    this->service.async_send(this->implementation, buffers, 0, handler);
+  }
+
+  /// Read some data from the socket.
+  /**
+   * This function is used to read data from the stream socket. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.read_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.receive(this->implementation, buffers, 0, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Read some data from the socket.
+  /**
+   * This function is used to read data from the stream socket. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.receive(this->implementation, buffers, 0, ec);
+  }
+
+  /// Start an asynchronous read.
+  /**
+   * This function is used to asynchronously read data from the stream socket.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read function if you need to ensure that the
+   * requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * socket.async_read_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    this->service.async_receive(this->implementation, buffers, 0, handler);
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BASIC_STREAM_SOCKET_HPP
diff --git a/ext/asio/basic_streambuf.hpp b/ext/asio/basic_streambuf.hpp
new file mode 100644
index 0000000000..b34b3fecf7
--- /dev/null
+++ b/ext/asio/basic_streambuf.hpp
@@ -0,0 +1,348 @@
+//
+// basic_streambuf.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BASIC_STREAMBUF_HPP
+#define ASIO_BASIC_STREAMBUF_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/push_options.hpp"
+#include <algorithm>
+#include <cstring>
+#include <memory>
+#include <stdexcept>
+#include <streambuf>
+#include <vector>
+#include <boost/limits.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+
+/// Automatically resizable buffer class based on std::streambuf.
+/**
+ * The @c basic_streambuf class is derived from @c std::streambuf to associate
+ * the streambuf's input and output sequences with one or more character
+ * arrays. These character arrays are internal to the @c basic_streambuf
+ * object, but direct access to the array elements is provided to permit them
+ * to be used efficiently with I/O operations. Characters written to the output
+ * sequence of a @c basic_streambuf object are appended to the input sequence
+ * of the same object.
+ *
+ * The @c basic_streambuf class's public interface is intended to permit the
+ * following implementation strategies:
+ *
+ * @li A single contiguous character array, which is reallocated as necessary
+ * to accommodate changes in the size of the character sequence. This is the
+ * implementation approach currently used in Asio.
+ *
+ * @li A sequence of one or more character arrays, where each array is of the
+ * same size. Additional character array objects are appended to the sequence
+ * to accommodate changes in the size of the character sequence.
+ *
+ * @li A sequence of one or more character arrays of varying sizes. Additional
+ * character array objects are appended to the sequence to accommodate changes
+ * in the size of the character sequence.
+ *
+ * The constructor for basic_streambuf accepts a @c size_t argument specifying
+ * the maximum of the sum of the sizes of the input sequence and output
+ * sequence. During the lifetime of the @c basic_streambuf object, the following
+ * invariant holds:
+ * @code size() <= max_size()@endcode
+ * Any member function that would, if successful, cause the invariant to be
+ * violated shall throw an exception of class @c std::length_error.
+ *
+ * The constructor for @c basic_streambuf takes an Allocator argument. A copy
+ * of this argument is used for any memory allocation performed, by the
+ * constructor and by all member functions, during the lifetime of each @c
+ * basic_streambuf object.
+ *
+ * @par Examples
+ * Writing directly from an streambuf to a socket:
+ * @code
+ * asio::streambuf b;
+ * std::ostream os(&b);
+ * os << "Hello, World!\n";
+ *
+ * // try sending some data in input sequence
+ * size_t n = sock.send(b.data());
+ *
+ * b.consume(n); // sent data is removed from input sequence
+ * @endcode
+ *
+ * Reading from a socket directly into a streambuf:
+ * @code
+ * asio::streambuf b;
+ *
+ * // reserve 512 bytes in output sequence
+ * asio::streambuf::mutable_buffers_type bufs = b.prepare(512);
+ *
+ * size_t n = sock.receive(bufs);
+ *
+ * // received data is "committed" from output sequence to input sequence
+ * b.commit(n);
+ *
+ * std::istream is(&b);
+ * std::string s;
+ * is >> s;
+ * @endcode
+ */
+template <typename Allocator = std::allocator<char> >
+class basic_streambuf
+  : public std::streambuf,
+    private noncopyable
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The type used to represent the input sequence as a list of buffers.
+  typedef implementation_defined const_buffers_type;
+
+  /// The type used to represent the output sequence as a list of buffers.
+  typedef implementation_defined mutable_buffers_type;
+#else
+  typedef asio::const_buffers_1 const_buffers_type;
+  typedef asio::mutable_buffers_1 mutable_buffers_type;
+#endif
+
+  /// Construct a basic_streambuf object.
+  /**
+   * Constructs a streambuf with the specified maximum size. The initial size
+   * of the streambuf's input sequence is 0.
+   */
+  explicit basic_streambuf(
+      std::size_t max_size = (std::numeric_limits<std::size_t>::max)(),
+      const Allocator& allocator = Allocator())
+    : max_size_(max_size),
+      buffer_(allocator)
+  {
+    std::size_t pend = (std::min<std::size_t>)(max_size_, buffer_delta);
+    buffer_.resize((std::max<std::size_t>)(pend, 1));
+    setg(&buffer_[0], &buffer_[0], &buffer_[0]);
+    setp(&buffer_[0], &buffer_[0] + pend);
+  }
+
+  /// Get the size of the input sequence.
+  /**
+   * @returns The size of the input sequence. The value is equal to that
+   * calculated for @c s in the following code:
+   * @code
+   * size_t s = 0;
+   * const_buffers_type bufs = data();
+   * const_buffers_type::const_iterator i = bufs.begin();
+   * while (i != bufs.end())
+   * {
+   *   const_buffer buf(*i++);
+   *   s += buffer_size(buf);
+   * }
+   * @endcode
+   */
+  std::size_t size() const
+  {
+    return pptr() - gptr();
+  }
+
+  /// Get the maximum size of the basic_streambuf.
+  /**
+   * @returns The allowed maximum of the sum of the sizes of the input sequence
+   * and output sequence.
+   */
+  std::size_t max_size() const
+  {
+    return max_size_;
+  }
+
+  /// Get a list of buffers that represents the input sequence.
+  /**
+   * @returns An object of type @c const_buffers_type that satisfies
+   * ConstBufferSequence requirements, representing all character arrays in the
+   * input sequence.
+   *
+   * @note The returned object is invalidated by any @c basic_streambuf member
+   * function that modifies the input sequence or output sequence.
+   */
+  const_buffers_type data() const
+  {
+    return asio::buffer(asio::const_buffer(gptr(),
+          (pptr() - gptr()) * sizeof(char_type)));
+  }
+
+  /// Get a list of buffers that represents the output sequence, with the given
+  /// size.
+  /**
+   * Ensures that the output sequence can accommodate @c n characters,
+   * reallocating character array objects as necessary.
+   *
+   * @returns An object of type @c mutable_buffers_type that satisfies
+   * MutableBufferSequence requirements, representing character array objects
+   * at the start of the output sequence such that the sum of the buffer sizes
+   * is @c n.
+   *
+   * @throws std::length_error If <tt>size() + n > max_size()</tt>.
+   *
+   * @note The returned object is invalidated by any @c basic_streambuf member
+   * function that modifies the input sequence or output sequence.
+   */
+  mutable_buffers_type prepare(std::size_t n)
+  {
+    reserve(n);
+    return asio::buffer(asio::mutable_buffer(
+          pptr(), n * sizeof(char_type)));
+  }
+
+  /// Move characters from the output sequence to the input sequence.
+  /**
+   * Appends @c n characters from the start of the output sequence to the input
+   * sequence. The beginning of the output sequence is advanced by @c n
+   * characters.
+   *
+   * Requires a preceding call <tt>prepare(x)</tt> where <tt>x >= n</tt>, and
+   * no intervening operations that modify the input or output sequence.
+   *
+   * @throws std::length_error If @c n is greater than the size of the output
+   * sequence.
+   */
+  void commit(std::size_t n)
+  {
+    if (pptr() + n > epptr())
+      n = epptr() - pptr();
+    pbump(static_cast<int>(n));
+    setg(eback(), gptr(), pptr());
+  }
+
+  /// Remove characters from the input sequence.
+  /**
+   * Removes @c n characters from the beginning of the input sequence.
+   *
+   * @throws std::length_error If <tt>n > size()</tt>.
+   */
+  void consume(std::size_t n)
+  {
+    if (gptr() + n > pptr())
+      n = pptr() - gptr();
+    gbump(static_cast<int>(n));
+  }
+
+protected:
+  enum { buffer_delta = 128 };
+
+  /// Override std::streambuf behaviour.
+  /**
+   * Behaves according to the specification of @c std::streambuf::underflow().
+   */
+  int_type underflow()
+  {
+    if (gptr() < pptr())
+    {
+      setg(&buffer_[0], gptr(), pptr());
+      return traits_type::to_int_type(*gptr());
+    }
+    else
+    {
+      return traits_type::eof();
+    }
+  }
+
+  /// Override std::streambuf behaviour.
+  /**
+   * Behaves according to the specification of @c std::streambuf::overflow(),
+   * with the specialisation that @c std::length_error is thrown if appending
+   * the character to the input sequence would require the condition
+   * <tt>size() > max_size()</tt> to be true.
+   */
+  int_type overflow(int_type c)
+  {
+    if (!traits_type::eq_int_type(c, traits_type::eof()))
+    {
+      if (pptr() == epptr())
+      {
+        std::size_t buffer_size = pptr() - gptr();
+        if (buffer_size < max_size_ && max_size_ - buffer_size < buffer_delta)
+        {
+          reserve(max_size_ - buffer_size);
+        }
+        else
+        {
+          reserve(buffer_delta);
+        }
+      }
+
+      *pptr() = traits_type::to_char_type(c);
+      pbump(1);
+      return c;
+    }
+
+    return traits_type::not_eof(c);
+  }
+
+  void reserve(std::size_t n)
+  {
+    // Get current stream positions as offsets.
+    std::size_t gnext = gptr() - &buffer_[0];
+    std::size_t pnext = pptr() - &buffer_[0];
+    std::size_t pend = epptr() - &buffer_[0];
+
+    // Check if there is already enough space in the put area.
+    if (n <= pend - pnext)
+    {
+      return;
+    }
+
+    // Shift existing contents of get area to start of buffer.
+    if (gnext > 0)
+    {
+      pnext -= gnext;
+      std::memmove(&buffer_[0], &buffer_[0] + gnext, pnext);
+    }
+
+    // Ensure buffer is large enough to hold at least the specified size.
+    if (n > pend - pnext)
+    {
+      if (n <= max_size_ && pnext <= max_size_ - n)
+      {
+        pend = pnext + n;
+        buffer_.resize((std::max<std::size_t>)(pend, 1));
+      }
+      else
+      {
+        std::length_error ex("asio::streambuf too long");
+        boost::throw_exception(ex);
+      }
+    }
+
+    // Update stream positions.
+    setg(&buffer_[0], &buffer_[0], &buffer_[0] + pnext);
+    setp(&buffer_[0] + pnext, &buffer_[0] + pend);
+  }
+
+private:
+  std::size_t max_size_;
+  std::vector<char_type, Allocator> buffer_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+#endif // ASIO_BASIC_STREAMBUF_HPP
diff --git a/ext/asio/buffer.hpp b/ext/asio/buffer.hpp
new file mode 100644
index 0000000000..43b475c5be
--- /dev/null
+++ b/ext/asio/buffer.hpp
@@ -0,0 +1,1040 @@
+//
+// buffer.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFER_HPP
+#define ASIO_BUFFER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/array.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <string>
+#include <vector>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_MSVC)
+# if defined(_HAS_ITERATOR_DEBUGGING) && (_HAS_ITERATOR_DEBUGGING != 0)
+#  if !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
+#   define ASIO_ENABLE_BUFFER_DEBUGGING
+#  endif // !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
+# endif // defined(_HAS_ITERATOR_DEBUGGING)
+#endif // defined(BOOST_MSVC)
+
+#if defined(__GNUC__)
+# if defined(_GLIBCXX_DEBUG)
+#  if !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
+#   define ASIO_ENABLE_BUFFER_DEBUGGING
+#  endif // !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
+# endif // defined(_GLIBCXX_DEBUG)
+#endif // defined(__GNUC__)
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+# include "asio/detail/push_options.hpp"
+# include <boost/function.hpp>
+# include "asio/detail/pop_options.hpp"
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+
+namespace asio {
+
+class mutable_buffer;
+class const_buffer;
+
+namespace detail {
+void* buffer_cast_helper(const mutable_buffer&);
+const void* buffer_cast_helper(const const_buffer&);
+std::size_t buffer_size_helper(const mutable_buffer&);
+std::size_t buffer_size_helper(const const_buffer&);
+} // namespace detail
+
+/// Holds a buffer that can be modified.
+/**
+ * The mutable_buffer class provides a safe representation of a buffer that can
+ * be modified. It does not own the underlying data, and so is cheap to copy or
+ * assign.
+ */
+class mutable_buffer
+{
+public:
+  /// Construct an empty buffer.
+  mutable_buffer()
+    : data_(0),
+      size_(0)
+  {
+  }
+
+  /// Construct a buffer to represent a given memory range.
+  mutable_buffer(void* data, std::size_t size)
+    : data_(data),
+      size_(size)
+  {
+  }
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+  mutable_buffer(void* data, std::size_t size,
+      boost::function<void()> debug_check)
+    : data_(data),
+      size_(size),
+      debug_check_(debug_check)
+  {
+  }
+
+  const boost::function<void()>& get_debug_check() const
+  {
+    return debug_check_;
+  }
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+
+private:
+  friend void* asio::detail::buffer_cast_helper(
+      const mutable_buffer& b);
+  friend std::size_t asio::detail::buffer_size_helper(
+      const mutable_buffer& b);
+
+  void* data_;
+  std::size_t size_;
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+  boost::function<void()> debug_check_;
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+};
+
+namespace detail {
+
+inline void* buffer_cast_helper(const mutable_buffer& b)
+{
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+  if (b.size_ && b.debug_check_)
+    b.debug_check_();
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+  return b.data_;
+}
+
+inline std::size_t buffer_size_helper(const mutable_buffer& b)
+{
+  return b.size_;
+}
+
+} // namespace detail
+
+/// Cast a non-modifiable buffer to a specified pointer to POD type.
+/**
+ * @relates mutable_buffer
+ */
+template <typename PointerToPodType>
+inline PointerToPodType buffer_cast(const mutable_buffer& b)
+{
+  return static_cast<PointerToPodType>(detail::buffer_cast_helper(b));
+}
+
+/// Get the number of bytes in a non-modifiable buffer.
+/**
+ * @relates mutable_buffer
+ */
+inline std::size_t buffer_size(const mutable_buffer& b)
+{
+  return detail::buffer_size_helper(b);
+}
+
+/// Create a new modifiable buffer that is offset from the start of another.
+/**
+ * @relates mutable_buffer
+ */
+inline mutable_buffer operator+(const mutable_buffer& b, std::size_t start)
+{
+  if (start > buffer_size(b))
+    return mutable_buffer();
+  char* new_data = buffer_cast<char*>(b) + start;
+  std::size_t new_size = buffer_size(b) - start;
+  return mutable_buffer(new_data, new_size
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+      , b.get_debug_check()
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+      );
+}
+
+/// Create a new modifiable buffer that is offset from the start of another.
+/**
+ * @relates mutable_buffer
+ */
+inline mutable_buffer operator+(std::size_t start, const mutable_buffer& b)
+{
+  if (start > buffer_size(b))
+    return mutable_buffer();
+  char* new_data = buffer_cast<char*>(b) + start;
+  std::size_t new_size = buffer_size(b) - start;
+  return mutable_buffer(new_data, new_size
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+      , b.get_debug_check()
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+      );
+}
+
+/// Adapts a single modifiable buffer so that it meets the requirements of the
+/// MutableBufferSequence concept.
+class mutable_buffers_1
+  : public mutable_buffer
+{
+public:
+  /// The type for each element in the list of buffers.
+  typedef mutable_buffer value_type;
+
+  /// A random-access iterator type that may be used to read elements.
+  typedef const mutable_buffer* const_iterator;
+
+  /// Construct to represent a given memory range.
+  mutable_buffers_1(void* data, std::size_t size)
+    : mutable_buffer(data, size)
+  {
+  }
+
+  /// Construct to represent a single modifiable buffer.
+  explicit mutable_buffers_1(const mutable_buffer& b)
+    : mutable_buffer(b)
+  {
+  }
+
+  /// Get a random-access iterator to the first element.
+  const_iterator begin() const
+  {
+    return this;
+  }
+
+  /// Get a random-access iterator for one past the last element.
+  const_iterator end() const
+  {
+    return begin() + 1;
+  }
+};
+
+/// Holds a buffer that cannot be modified.
+/**
+ * The const_buffer class provides a safe representation of a buffer that cannot
+ * be modified. It does not own the underlying data, and so is cheap to copy or
+ * assign.
+ */
+class const_buffer
+{
+public:
+  /// Construct an empty buffer.
+  const_buffer()
+    : data_(0),
+      size_(0)
+  {
+  }
+
+  /// Construct a buffer to represent a given memory range.
+  const_buffer(const void* data, std::size_t size)
+    : data_(data),
+      size_(size)
+  {
+  }
+
+  /// Construct a non-modifiable buffer from a modifiable one.
+  const_buffer(const mutable_buffer& b)
+    : data_(asio::detail::buffer_cast_helper(b)),
+      size_(asio::detail::buffer_size_helper(b))
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+      , debug_check_(b.get_debug_check())
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+  {
+  }
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+  const_buffer(const void* data, std::size_t size,
+      boost::function<void()> debug_check)
+    : data_(data),
+      size_(size),
+      debug_check_(debug_check)
+  {
+  }
+
+  const boost::function<void()>& get_debug_check() const
+  {
+    return debug_check_;
+  }
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+
+private:
+  friend const void* asio::detail::buffer_cast_helper(
+      const const_buffer& b);
+  friend std::size_t asio::detail::buffer_size_helper(
+      const const_buffer& b);
+
+  const void* data_;
+  std::size_t size_;
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+  boost::function<void()> debug_check_;
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+};
+
+namespace detail {
+
+inline const void* buffer_cast_helper(const const_buffer& b)
+{
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+  if (b.size_ && b.debug_check_)
+    b.debug_check_();
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+  return b.data_;
+}
+
+inline std::size_t buffer_size_helper(const const_buffer& b)
+{
+  return b.size_;
+}
+
+} // namespace detail
+
+/// Cast a non-modifiable buffer to a specified pointer to POD type.
+/**
+ * @relates const_buffer
+ */
+template <typename PointerToPodType>
+inline PointerToPodType buffer_cast(const const_buffer& b)
+{
+  return static_cast<PointerToPodType>(detail::buffer_cast_helper(b));
+}
+
+/// Get the number of bytes in a non-modifiable buffer.
+/**
+ * @relates const_buffer
+ */
+inline std::size_t buffer_size(const const_buffer& b)
+{
+  return detail::buffer_size_helper(b);
+}
+
+/// Create a new non-modifiable buffer that is offset from the start of another.
+/**
+ * @relates const_buffer
+ */
+inline const_buffer operator+(const const_buffer& b, std::size_t start)
+{
+  if (start > buffer_size(b))
+    return const_buffer();
+  const char* new_data = buffer_cast<const char*>(b) + start;
+  std::size_t new_size = buffer_size(b) - start;
+  return const_buffer(new_data, new_size
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+      , b.get_debug_check()
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+      );
+}
+
+/// Create a new non-modifiable buffer that is offset from the start of another.
+/**
+ * @relates const_buffer
+ */
+inline const_buffer operator+(std::size_t start, const const_buffer& b)
+{
+  if (start > buffer_size(b))
+    return const_buffer();
+  const char* new_data = buffer_cast<const char*>(b) + start;
+  std::size_t new_size = buffer_size(b) - start;
+  return const_buffer(new_data, new_size
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+      , b.get_debug_check()
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+      );
+}
+
+/// Adapts a single non-modifiable buffer so that it meets the requirements of
+/// the ConstBufferSequence concept.
+class const_buffers_1
+  : public const_buffer
+{
+public:
+  /// The type for each element in the list of buffers.
+  typedef const_buffer value_type;
+
+  /// A random-access iterator type that may be used to read elements.
+  typedef const const_buffer* const_iterator;
+
+  /// Construct to represent a given memory range.
+  const_buffers_1(const void* data, std::size_t size)
+    : const_buffer(data, size)
+  {
+  }
+
+  /// Construct to represent a single non-modifiable buffer.
+  explicit const_buffers_1(const const_buffer& b)
+    : const_buffer(b)
+  {
+  }
+
+  /// Get a random-access iterator to the first element.
+  const_iterator begin() const
+  {
+    return this;
+  }
+
+  /// Get a random-access iterator for one past the last element.
+  const_iterator end() const
+  {
+    return begin() + 1;
+  }
+};
+
+/// An implementation of both the ConstBufferSequence and MutableBufferSequence
+/// concepts to represent a null buffer sequence.
+class null_buffers
+{
+public:
+  /// The type for each element in the list of buffers.
+  typedef mutable_buffer value_type;
+
+  /// A random-access iterator type that may be used to read elements.
+  typedef const mutable_buffer* const_iterator;
+
+  /// Get a random-access iterator to the first element.
+  const_iterator begin() const
+  {
+    return &buf_;
+  }
+
+  /// Get a random-access iterator for one past the last element.
+  const_iterator end() const
+  {
+    return &buf_;
+  }
+
+private:
+  mutable_buffer buf_;
+};
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+namespace detail {
+
+template <typename Iterator>
+class buffer_debug_check
+{
+public:
+  buffer_debug_check(Iterator iter)
+    : iter_(iter)
+  {
+  }
+
+  ~buffer_debug_check()
+  {
+#if BOOST_WORKAROUND(BOOST_MSVC, == 1400)
+    // MSVC 8's string iterator checking may crash in a std::string::iterator
+    // object's destructor when the iterator points to an already-destroyed
+    // std::string object, unless the iterator is cleared first.
+    iter_ = Iterator();
+#endif // BOOST_WORKAROUND(BOOST_MSVC, == 1400)
+  }
+
+  void operator()()
+  {
+    *iter_;
+  }
+
+private:
+  Iterator iter_;
+};
+
+} // namespace detail
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+
+/** @defgroup buffer asio::buffer
+ *
+ * @brief The asio::buffer function is used to create a buffer object to
+ * represent raw memory, an array of POD elements, a vector of POD elements,
+ * or a std::string.
+ *
+ * A buffer object represents a contiguous region of memory as a 2-tuple
+ * consisting of a pointer and size in bytes. A tuple of the form <tt>{void*,
+ * size_t}</tt> specifies a mutable (modifiable) region of memory. Similarly, a
+ * tuple of the form <tt>{const void*, size_t}</tt> specifies a const
+ * (non-modifiable) region of memory. These two forms correspond to the classes
+ * mutable_buffer and const_buffer, respectively. To mirror C++'s conversion
+ * rules, a mutable_buffer is implicitly convertible to a const_buffer, and the
+ * opposite conversion is not permitted.
+ *
+ * The simplest use case involves reading or writing a single buffer of a
+ * specified size:
+ *
+ * @code sock.send(asio::buffer(data, size)); @endcode
+ *
+ * In the above example, the return value of asio::buffer meets the
+ * requirements of the ConstBufferSequence concept so that it may be directly
+ * passed to the socket's write function. A buffer created for modifiable
+ * memory also meets the requirements of the MutableBufferSequence concept.
+ *
+ * An individual buffer may be created from a builtin array, std::vector or
+ * boost::array of POD elements. This helps prevent buffer overruns by
+ * automatically determining the size of the buffer:
+ *
+ * @code char d1[128];
+ * size_t bytes_transferred = sock.receive(asio::buffer(d1));
+ *
+ * std::vector<char> d2(128);
+ * bytes_transferred = sock.receive(asio::buffer(d2));
+ *
+ * boost::array<char, 128> d3;
+ * bytes_transferred = sock.receive(asio::buffer(d3)); @endcode
+ *
+ * In all three cases above, the buffers created are exactly 128 bytes long.
+ * Note that a vector is @e never automatically resized when creating or using
+ * a buffer. The buffer size is determined using the vector's <tt>size()</tt>
+ * member function, and not its capacity.
+ *
+ * @par Accessing Buffer Contents
+ *
+ * The contents of a buffer may be accessed using the asio::buffer_size
+ * and asio::buffer_cast functions:
+ *
+ * @code asio::mutable_buffer b1 = ...;
+ * std::size_t s1 = asio::buffer_size(b1);
+ * unsigned char* p1 = asio::buffer_cast<unsigned char*>(b1);
+ *
+ * asio::const_buffer b2 = ...;
+ * std::size_t s2 = asio::buffer_size(b2);
+ * const void* p2 = asio::buffer_cast<const void*>(b2); @endcode
+ *
+ * The asio::buffer_cast function permits violations of type safety, so
+ * uses of it in application code should be carefully considered.
+ *
+ * @par Buffer Invalidation
+ *
+ * A buffer object does not have any ownership of the memory it refers to. It
+ * is the responsibility of the application to ensure the memory region remains
+ * valid until it is no longer required for an I/O operation. When the memory
+ * is no longer available, the buffer is said to have been invalidated.
+ *
+ * For the asio::buffer overloads that accept an argument of type
+ * std::vector, the buffer objects returned are invalidated by any vector
+ * operation that also invalidates all references, pointers and iterators
+ * referring to the elements in the sequence (C++ Std, 23.2.4)
+ *
+ * For the asio::buffer overloads that accept an argument of type
+ * std::string, the buffer objects returned are invalidated according to the
+ * rules defined for invalidation of references, pointers and iterators
+ * referring to elements of the sequence (C++ Std, 21.3).
+ *
+ * @par Buffer Arithmetic
+ *
+ * Buffer objects may be manipulated using simple arithmetic in a safe way
+ * which helps prevent buffer overruns. Consider an array initialised as
+ * follows:
+ *
+ * @code boost::array<char, 6> a = { 'a', 'b', 'c', 'd', 'e' }; @endcode
+ *
+ * A buffer object @c b1 created using:
+ *
+ * @code b1 = asio::buffer(a); @endcode
+ *
+ * represents the entire array, <tt>{ 'a', 'b', 'c', 'd', 'e' }</tt>. An
+ * optional second argument to the asio::buffer function may be used to
+ * limit the size, in bytes, of the buffer:
+ *
+ * @code b2 = asio::buffer(a, 3); @endcode
+ *
+ * such that @c b2 represents the data <tt>{ 'a', 'b', 'c' }</tt>. Even if the
+ * size argument exceeds the actual size of the array, the size of the buffer
+ * object created will be limited to the array size.
+ *
+ * An offset may be applied to an existing buffer to create a new one:
+ *
+ * @code b3 = b1 + 2; @endcode
+ *
+ * where @c b3 will set to represent <tt>{ 'c', 'd', 'e' }</tt>. If the offset
+ * exceeds the size of the existing buffer, the newly created buffer will be
+ * empty.
+ *
+ * Both an offset and size may be specified to create a buffer that corresponds
+ * to a specific range of bytes within an existing buffer:
+ *
+ * @code b4 = asio::buffer(b1 + 1, 3); @endcode
+ *
+ * so that @c b4 will refer to the bytes <tt>{ 'b', 'c', 'd' }</tt>.
+ *
+ * @par Buffers and Scatter-Gather I/O
+ *
+ * To read or write using multiple buffers (i.e. scatter-gather I/O), multiple
+ * buffer objects may be assigned into a container that supports the
+ * MutableBufferSequence (for read) or ConstBufferSequence (for write) concepts:
+ *
+ * @code
+ * char d1[128];
+ * std::vector<char> d2(128);
+ * boost::array<char, 128> d3;
+ *
+ * boost::array<mutable_buffer, 3> bufs1 = {
+ *   asio::buffer(d1),
+ *   asio::buffer(d2),
+ *   asio::buffer(d3) };
+ * bytes_transferred = sock.receive(bufs1);
+ *
+ * std::vector<const_buffer> bufs2;
+ * bufs2.push_back(asio::buffer(d1));
+ * bufs2.push_back(asio::buffer(d2));
+ * bufs2.push_back(asio::buffer(d3));
+ * bytes_transferred = sock.send(bufs2); @endcode
+ */
+/*@{*/
+
+/// Create a new modifiable buffer from an existing buffer.
+/**
+ * @returns <tt>mutable_buffers_1(b)</tt>.
+ */
+inline mutable_buffers_1 buffer(const mutable_buffer& b)
+{
+  return mutable_buffers_1(b);
+}
+
+/// Create a new modifiable buffer from an existing buffer.
+/**
+ * @returns A mutable_buffers_1 value equivalent to:
+ * @code mutable_buffers_1(
+ *     buffer_cast<void*>(b),
+ *     min(buffer_size(b), max_size_in_bytes)); @endcode
+ */
+inline mutable_buffers_1 buffer(const mutable_buffer& b,
+    std::size_t max_size_in_bytes)
+{
+  return mutable_buffers_1(
+      mutable_buffer(buffer_cast<void*>(b),
+        buffer_size(b) < max_size_in_bytes
+        ? buffer_size(b) : max_size_in_bytes
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , b.get_debug_check()
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/// Create a new non-modifiable buffer from an existing buffer.
+/**
+ * @returns <tt>const_buffers_1(b)</tt>.
+ */
+inline const_buffers_1 buffer(const const_buffer& b)
+{
+  return const_buffers_1(b);
+}
+
+/// Create a new non-modifiable buffer from an existing buffer.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     buffer_cast<const void*>(b),
+ *     min(buffer_size(b), max_size_in_bytes)); @endcode
+ */
+inline const_buffers_1 buffer(const const_buffer& b,
+    std::size_t max_size_in_bytes)
+{
+  return const_buffers_1(
+      const_buffer(buffer_cast<const void*>(b),
+        buffer_size(b) < max_size_in_bytes
+        ? buffer_size(b) : max_size_in_bytes
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , b.get_debug_check()
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/// Create a new modifiable buffer that represents the given memory range.
+/**
+ * @returns <tt>mutable_buffers_1(data, size_in_bytes)</tt>.
+ */
+inline mutable_buffers_1 buffer(void* data, std::size_t size_in_bytes)
+{
+  return mutable_buffers_1(mutable_buffer(data, size_in_bytes));
+}
+
+/// Create a new non-modifiable buffer that represents the given memory range.
+/**
+ * @returns <tt>const_buffers_1(data, size_in_bytes)</tt>.
+ */
+inline const_buffers_1 buffer(const void* data,
+    std::size_t size_in_bytes)
+{
+  return const_buffers_1(const_buffer(data, size_in_bytes));
+}
+
+/// Create a new modifiable buffer that represents the given POD array.
+/**
+ * @returns A mutable_buffers_1 value equivalent to:
+ * @code mutable_buffers_1(
+ *     static_cast<void*>(data),
+ *     N * sizeof(PodType)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline mutable_buffers_1 buffer(PodType (&data)[N])
+{
+  return mutable_buffers_1(mutable_buffer(data, N * sizeof(PodType)));
+}
+ 
+/// Create a new modifiable buffer that represents the given POD array.
+/**
+ * @returns A mutable_buffers_1 value equivalent to:
+ * @code mutable_buffers_1(
+ *     static_cast<void*>(data),
+ *     min(N * sizeof(PodType), max_size_in_bytes)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline mutable_buffers_1 buffer(PodType (&data)[N],
+    std::size_t max_size_in_bytes)
+{
+  return mutable_buffers_1(
+      mutable_buffer(data,
+        N * sizeof(PodType) < max_size_in_bytes
+        ? N * sizeof(PodType) : max_size_in_bytes));
+}
+ 
+/// Create a new non-modifiable buffer that represents the given POD array.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     static_cast<const void*>(data),
+ *     N * sizeof(PodType)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline const_buffers_1 buffer(const PodType (&data)[N])
+{
+  return const_buffers_1(const_buffer(data, N * sizeof(PodType)));
+}
+
+/// Create a new non-modifiable buffer that represents the given POD array.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     static_cast<const void*>(data),
+ *     min(N * sizeof(PodType), max_size_in_bytes)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline const_buffers_1 buffer(const PodType (&data)[N],
+    std::size_t max_size_in_bytes)
+{
+  return const_buffers_1(
+      const_buffer(data,
+        N * sizeof(PodType) < max_size_in_bytes
+        ? N * sizeof(PodType) : max_size_in_bytes));
+}
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582)) \
+  || BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
+
+// Borland C++ and Sun Studio think the overloads:
+//
+//   unspecified buffer(boost::array<PodType, N>& array ...);
+//
+// and
+//
+//   unspecified buffer(boost::array<const PodType, N>& array ...);
+//
+// are ambiguous. This will be worked around by using a buffer_types traits
+// class that contains typedefs for the appropriate buffer and container
+// classes, based on whether PodType is const or non-const.
+
+namespace detail {
+
+template <bool IsConst>
+struct buffer_types_base;
+
+template <>
+struct buffer_types_base<false>
+{
+  typedef mutable_buffer buffer_type;
+  typedef mutable_buffers_1 container_type;
+};
+
+template <>
+struct buffer_types_base<true>
+{
+  typedef const_buffer buffer_type;
+  typedef const_buffers_1 container_type;
+};
+
+template <typename PodType>
+struct buffer_types
+  : public buffer_types_base<boost::is_const<PodType>::value>
+{
+};
+
+} // namespace detail
+
+template <typename PodType, std::size_t N>
+inline typename detail::buffer_types<PodType>::container_type
+buffer(boost::array<PodType, N>& data)
+{
+  typedef typename asio::detail::buffer_types<PodType>::buffer_type
+    buffer_type;
+  typedef typename asio::detail::buffer_types<PodType>::container_type
+    container_type;
+  return container_type(
+      buffer_type(data.c_array(), data.size() * sizeof(PodType)));
+}
+
+template <typename PodType, std::size_t N>
+inline typename detail::buffer_types<PodType>::container_type
+buffer(boost::array<PodType, N>& data, std::size_t max_size_in_bytes)
+{
+  typedef typename asio::detail::buffer_types<PodType>::buffer_type
+    buffer_type;
+  typedef typename asio::detail::buffer_types<PodType>::container_type
+    container_type;
+  return container_type(
+      buffer_type(data.c_array(),
+        data.size() * sizeof(PodType) < max_size_in_bytes
+        ? data.size() * sizeof(PodType) : max_size_in_bytes));
+}
+
+#else // BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
+      // || BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
+
+/// Create a new modifiable buffer that represents the given POD array.
+/**
+ * @returns A mutable_buffers_1 value equivalent to:
+ * @code mutable_buffers_1(
+ *     data.data(),
+ *     data.size() * sizeof(PodType)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline mutable_buffers_1 buffer(boost::array<PodType, N>& data)
+{
+  return mutable_buffers_1(
+      mutable_buffer(data.c_array(), data.size() * sizeof(PodType)));
+}
+
+/// Create a new modifiable buffer that represents the given POD array.
+/**
+ * @returns A mutable_buffers_1 value equivalent to:
+ * @code mutable_buffers_1(
+ *     data.data(),
+ *     min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline mutable_buffers_1 buffer(boost::array<PodType, N>& data,
+    std::size_t max_size_in_bytes)
+{
+  return mutable_buffers_1(
+      mutable_buffer(data.c_array(),
+        data.size() * sizeof(PodType) < max_size_in_bytes
+        ? data.size() * sizeof(PodType) : max_size_in_bytes));
+}
+
+/// Create a new non-modifiable buffer that represents the given POD array.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     data.data(),
+ *     data.size() * sizeof(PodType)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline const_buffers_1 buffer(boost::array<const PodType, N>& data)
+{
+  return const_buffers_1(
+      const_buffer(data.data(), data.size() * sizeof(PodType)));
+}
+
+/// Create a new non-modifiable buffer that represents the given POD array.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     data.data(),
+ *     min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline const_buffers_1 buffer(boost::array<const PodType, N>& data,
+    std::size_t max_size_in_bytes)
+{
+  return const_buffers_1(
+      const_buffer(data.data(),
+        data.size() * sizeof(PodType) < max_size_in_bytes
+        ? data.size() * sizeof(PodType) : max_size_in_bytes));
+}
+
+#endif // BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
+       // || BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
+
+/// Create a new non-modifiable buffer that represents the given POD array.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     data.data(),
+ *     data.size() * sizeof(PodType)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline const_buffers_1 buffer(const boost::array<PodType, N>& data)
+{
+  return const_buffers_1(
+      const_buffer(data.data(), data.size() * sizeof(PodType)));
+}
+
+/// Create a new non-modifiable buffer that represents the given POD array.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     data.data(),
+ *     min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
+ */
+template <typename PodType, std::size_t N>
+inline const_buffers_1 buffer(const boost::array<PodType, N>& data,
+    std::size_t max_size_in_bytes)
+{
+  return const_buffers_1(
+      const_buffer(data.data(),
+        data.size() * sizeof(PodType) < max_size_in_bytes
+        ? data.size() * sizeof(PodType) : max_size_in_bytes));
+}
+
+/// Create a new modifiable buffer that represents the given POD vector.
+/**
+ * @returns A mutable_buffers_1 value equivalent to:
+ * @code mutable_buffers_1(
+ *     data.size() ? &data[0] : 0,
+ *     data.size() * sizeof(PodType)); @endcode
+ *
+ * @note The buffer is invalidated by any vector operation that would also
+ * invalidate iterators.
+ */
+template <typename PodType, typename Allocator>
+inline mutable_buffers_1 buffer(std::vector<PodType, Allocator>& data)
+{
+  return mutable_buffers_1(
+      mutable_buffer(data.size() ? &data[0] : 0, data.size() * sizeof(PodType)
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , detail::buffer_debug_check<
+            typename std::vector<PodType, Allocator>::iterator
+          >(data.begin())
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/// Create a new modifiable buffer that represents the given POD vector.
+/**
+ * @returns A mutable_buffers_1 value equivalent to:
+ * @code mutable_buffers_1(
+ *     data.size() ? &data[0] : 0,
+ *     min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
+ *
+ * @note The buffer is invalidated by any vector operation that would also
+ * invalidate iterators.
+ */
+template <typename PodType, typename Allocator>
+inline mutable_buffers_1 buffer(std::vector<PodType, Allocator>& data,
+    std::size_t max_size_in_bytes)
+{
+  return mutable_buffers_1(
+      mutable_buffer(data.size() ? &data[0] : 0,
+        data.size() * sizeof(PodType) < max_size_in_bytes
+        ? data.size() * sizeof(PodType) : max_size_in_bytes
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , detail::buffer_debug_check<
+            typename std::vector<PodType, Allocator>::iterator
+          >(data.begin())
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/// Create a new non-modifiable buffer that represents the given POD vector.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     data.size() ? &data[0] : 0,
+ *     data.size() * sizeof(PodType)); @endcode
+ *
+ * @note The buffer is invalidated by any vector operation that would also
+ * invalidate iterators.
+ */
+template <typename PodType, typename Allocator>
+inline const_buffers_1 buffer(
+    const std::vector<PodType, Allocator>& data)
+{
+  return const_buffers_1(
+      const_buffer(data.size() ? &data[0] : 0, data.size() * sizeof(PodType)
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , detail::buffer_debug_check<
+            typename std::vector<PodType, Allocator>::const_iterator
+          >(data.begin())
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/// Create a new non-modifiable buffer that represents the given POD vector.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     data.size() ? &data[0] : 0,
+ *     min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
+ *
+ * @note The buffer is invalidated by any vector operation that would also
+ * invalidate iterators.
+ */
+template <typename PodType, typename Allocator>
+inline const_buffers_1 buffer(
+    const std::vector<PodType, Allocator>& data, std::size_t max_size_in_bytes)
+{
+  return const_buffers_1(
+      const_buffer(data.size() ? &data[0] : 0,
+        data.size() * sizeof(PodType) < max_size_in_bytes
+        ? data.size() * sizeof(PodType) : max_size_in_bytes
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , detail::buffer_debug_check<
+            typename std::vector<PodType, Allocator>::const_iterator
+          >(data.begin())
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/// Create a new non-modifiable buffer that represents the given string.
+/**
+ * @returns <tt>const_buffers_1(data.data(), data.size())</tt>.
+ *
+ * @note The buffer is invalidated by any non-const operation called on the
+ * given string object.
+ */
+inline const_buffers_1 buffer(const std::string& data)
+{
+  return const_buffers_1(const_buffer(data.data(), data.size()
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , detail::buffer_debug_check<std::string::const_iterator>(data.begin())
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/// Create a new non-modifiable buffer that represents the given string.
+/**
+ * @returns A const_buffers_1 value equivalent to:
+ * @code const_buffers_1(
+ *     data.data(),
+ *     min(data.size(), max_size_in_bytes)); @endcode
+ *
+ * @note The buffer is invalidated by any non-const operation called on the
+ * given string object.
+ */
+inline const_buffers_1 buffer(const std::string& data,
+    std::size_t max_size_in_bytes)
+{
+  return const_buffers_1(
+      const_buffer(data.data(),
+        data.size() < max_size_in_bytes
+        ? data.size() : max_size_in_bytes
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        , detail::buffer_debug_check<std::string::const_iterator>(data.begin())
+#endif // ASIO_ENABLE_BUFFER_DEBUGGING
+        ));
+}
+
+/*@}*/
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFER_HPP
diff --git a/ext/asio/buffered_read_stream.hpp b/ext/asio/buffered_read_stream.hpp
new file mode 100644
index 0000000000..afd22cec86
--- /dev/null
+++ b/ext/asio/buffered_read_stream.hpp
@@ -0,0 +1,461 @@
+//
+// buffered_read_stream.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFERED_READ_STREAM_HPP
+#define ASIO_BUFFERED_READ_STREAM_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <cstring>
+#include <boost/config.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffered_read_stream_fwd.hpp"
+#include "asio/buffer.hpp"
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_resize_guard.hpp"
+#include "asio/detail/buffered_stream_storage.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+
+/// Adds buffering to the read-related operations of a stream.
+/**
+ * The buffered_read_stream class template can be used to add buffering to the
+ * synchronous and asynchronous read operations of a stream.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, Sync_Read_Stream, SyncWriteStream.
+ */
+template <typename Stream>
+class buffered_read_stream
+  : private noncopyable
+{
+public:
+  /// The type of the next layer.
+  typedef typename boost::remove_reference<Stream>::type next_layer_type;
+
+  /// The type of the lowest layer.
+  typedef typename next_layer_type::lowest_layer_type lowest_layer_type;
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// The default buffer size.
+  static const std::size_t default_buffer_size = implementation_defined;
+#else
+  BOOST_STATIC_CONSTANT(std::size_t, default_buffer_size = 1024);
+#endif
+
+  /// Construct, passing the specified argument to initialise the next layer.
+  template <typename Arg>
+  explicit buffered_read_stream(Arg& a)
+    : next_layer_(a),
+      storage_(default_buffer_size)
+  {
+  }
+
+  /// Construct, passing the specified argument to initialise the next layer.
+  template <typename Arg>
+  buffered_read_stream(Arg& a, std::size_t buffer_size)
+    : next_layer_(a),
+      storage_(buffer_size)
+  {
+  }
+
+  /// Get a reference to the next layer.
+  next_layer_type& next_layer()
+  {
+    return next_layer_;
+  }
+
+  /// Get a reference to the lowest layer.
+  lowest_layer_type& lowest_layer()
+  {
+    return next_layer_.lowest_layer();
+  }
+
+  /// Get a const reference to the lowest layer.
+  const lowest_layer_type& lowest_layer() const
+  {
+    return next_layer_.lowest_layer();
+  }
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with
+  /// the object.
+  asio::io_service& io_service()
+  {
+    return next_layer_.get_io_service();
+  }
+
+  /// Get the io_service associated with the object.
+  asio::io_service& get_io_service()
+  {
+    return next_layer_.get_io_service();
+  }
+
+  /// Close the stream.
+  void close()
+  {
+    next_layer_.close();
+  }
+
+  /// Close the stream.
+  asio::error_code close(asio::error_code& ec)
+  {
+    return next_layer_.close(ec);
+  }
+
+  /// Write the given data to the stream. Returns the number of bytes written.
+  /// Throws an exception on failure.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    return next_layer_.write_some(buffers);
+  }
+
+  /// Write the given data to the stream. Returns the number of bytes written,
+  /// or 0 if an error occurred.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return next_layer_.write_some(buffers, ec);
+  }
+
+  /// Start an asynchronous write. The data being written must be valid for the
+  /// lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    next_layer_.async_write_some(buffers, handler);
+  }
+
+  /// Fill the buffer with some data. Returns the number of bytes placed in the
+  /// buffer as a result of the operation. Throws an exception on failure.
+  std::size_t fill()
+  {
+    detail::buffer_resize_guard<detail::buffered_stream_storage>
+      resize_guard(storage_);
+    std::size_t previous_size = storage_.size();
+    storage_.resize(storage_.capacity());
+    storage_.resize(previous_size + next_layer_.read_some(buffer(
+            storage_.data() + previous_size,
+            storage_.size() - previous_size)));
+    resize_guard.commit();
+    return storage_.size() - previous_size;
+  }
+
+  /// Fill the buffer with some data. Returns the number of bytes placed in the
+  /// buffer as a result of the operation, or 0 if an error occurred.
+  std::size_t fill(asio::error_code& ec)
+  {
+    detail::buffer_resize_guard<detail::buffered_stream_storage>
+      resize_guard(storage_);
+    std::size_t previous_size = storage_.size();
+    storage_.resize(storage_.capacity());
+    storage_.resize(previous_size + next_layer_.read_some(buffer(
+            storage_.data() + previous_size,
+            storage_.size() - previous_size),
+          ec));
+    resize_guard.commit();
+    return storage_.size() - previous_size;
+  }
+
+  template <typename ReadHandler>
+  class fill_handler
+  {
+  public:
+    fill_handler(asio::io_service& io_service,
+        detail::buffered_stream_storage& storage,
+        std::size_t previous_size, ReadHandler handler)
+      : io_service_(io_service),
+        storage_(storage),
+        previous_size_(previous_size),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      storage_.resize(previous_size_ + bytes_transferred);
+      io_service_.dispatch(detail::bind_handler(
+            handler_, ec, bytes_transferred));
+    }
+
+  private:
+    asio::io_service& io_service_;
+    detail::buffered_stream_storage& storage_;
+    std::size_t previous_size_;
+    ReadHandler handler_;
+  };
+
+  /// Start an asynchronous fill.
+  template <typename ReadHandler>
+  void async_fill(ReadHandler handler)
+  {
+    std::size_t previous_size = storage_.size();
+    storage_.resize(storage_.capacity());
+    next_layer_.async_read_some(
+        buffer(
+          storage_.data() + previous_size,
+          storage_.size() - previous_size),
+        fill_handler<ReadHandler>(get_io_service(),
+          storage_, previous_size, handler));
+  }
+
+  /// Read some data from the stream. Returns the number of bytes read. Throws
+  /// an exception on failure.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    typename MutableBufferSequence::const_iterator iter = buffers.begin();
+    typename MutableBufferSequence::const_iterator end = buffers.end();
+    size_t total_buffer_size = 0;
+    for (; iter != end; ++iter)
+    {
+      asio::mutable_buffer buffer(*iter);
+      total_buffer_size += asio::buffer_size(buffer);
+    }
+
+    if (total_buffer_size == 0)
+      return 0;
+
+    if (storage_.empty())
+      fill();
+
+    return copy(buffers);
+  }
+
+  /// Read some data from the stream. Returns the number of bytes read or 0 if
+  /// an error occurred.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    ec = asio::error_code();
+
+    typename MutableBufferSequence::const_iterator iter = buffers.begin();
+    typename MutableBufferSequence::const_iterator end = buffers.end();
+    size_t total_buffer_size = 0;
+    for (; iter != end; ++iter)
+    {
+      asio::mutable_buffer buffer(*iter);
+      total_buffer_size += asio::buffer_size(buffer);
+    }
+
+    if (total_buffer_size == 0)
+      return 0;
+
+    if (storage_.empty() && !fill(ec))
+      return 0;
+
+    return copy(buffers);
+  }
+
+  template <typename MutableBufferSequence, typename ReadHandler>
+  class read_some_handler
+  {
+  public:
+    read_some_handler(asio::io_service& io_service,
+        detail::buffered_stream_storage& storage,
+        const MutableBufferSequence& buffers, ReadHandler handler)
+      : io_service_(io_service),
+        storage_(storage),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec, std::size_t)
+    {
+      if (ec || storage_.empty())
+      {
+        std::size_t length = 0;
+        io_service_.dispatch(detail::bind_handler(handler_, ec, length));
+      }
+      else
+      {
+        using namespace std; // For memcpy.
+
+        std::size_t bytes_avail = storage_.size();
+        std::size_t bytes_copied = 0;
+
+        typename MutableBufferSequence::const_iterator iter = buffers_.begin();
+        typename MutableBufferSequence::const_iterator end = buffers_.end();
+        for (; iter != end && bytes_avail > 0; ++iter)
+        {
+          std::size_t max_length = buffer_size(*iter);
+          std::size_t length = (max_length < bytes_avail)
+            ? max_length : bytes_avail;
+          memcpy(buffer_cast<void*>(*iter),
+              storage_.data() + bytes_copied, length);
+          bytes_copied += length;
+          bytes_avail -= length;
+        }
+
+        storage_.consume(bytes_copied);
+        io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_copied));
+      }
+    }
+
+  private:
+    asio::io_service& io_service_;
+    detail::buffered_stream_storage& storage_;
+    MutableBufferSequence buffers_;
+    ReadHandler handler_;
+  };
+
+  /// Start an asynchronous read. The buffer into which the data will be read
+  /// must be valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    typename MutableBufferSequence::const_iterator iter = buffers.begin();
+    typename MutableBufferSequence::const_iterator end = buffers.end();
+    size_t total_buffer_size = 0;
+    for (; iter != end; ++iter)
+    {
+      asio::mutable_buffer buffer(*iter);
+      total_buffer_size += asio::buffer_size(buffer);
+    }
+
+    if (total_buffer_size == 0)
+    {
+      get_io_service().post(detail::bind_handler(
+            handler, asio::error_code(), 0));
+    }
+    else if (storage_.empty())
+    {
+      async_fill(read_some_handler<MutableBufferSequence, ReadHandler>(
+            get_io_service(), storage_, buffers, handler));
+    }
+    else
+    {
+      std::size_t length = copy(buffers);
+      get_io_service().post(detail::bind_handler(
+            handler, asio::error_code(), length));
+    }
+  }
+
+  /// Peek at the incoming data on the stream. Returns the number of bytes read.
+  /// Throws an exception on failure.
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers)
+  {
+    if (storage_.empty())
+      fill();
+    return peek_copy(buffers);
+  }
+
+  /// Peek at the incoming data on the stream. Returns the number of bytes read,
+  /// or 0 if an error occurred.
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    ec = asio::error_code();
+    if (storage_.empty() && !fill(ec))
+      return 0;
+    return peek_copy(buffers);
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail()
+  {
+    return storage_.size();
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail(asio::error_code& ec)
+  {
+    ec = asio::error_code();
+    return storage_.size();
+  }
+
+private:
+  /// Copy data out of the internal buffer to the specified target buffer.
+  /// Returns the number of bytes copied.
+  template <typename MutableBufferSequence>
+  std::size_t copy(const MutableBufferSequence& buffers)
+  {
+    using namespace std; // For memcpy.
+
+    std::size_t bytes_avail = storage_.size();
+    std::size_t bytes_copied = 0;
+
+    typename MutableBufferSequence::const_iterator iter = buffers.begin();
+    typename MutableBufferSequence::const_iterator end = buffers.end();
+    for (; iter != end && bytes_avail > 0; ++iter)
+    {
+      std::size_t max_length = buffer_size(*iter);
+      std::size_t length = (max_length < bytes_avail)
+        ? max_length : bytes_avail;
+      memcpy(buffer_cast<void*>(*iter), storage_.data() + bytes_copied, length);
+      bytes_copied += length;
+      bytes_avail -= length;
+    }
+
+    storage_.consume(bytes_copied);
+    return bytes_copied;
+  }
+
+  /// Copy data from the internal buffer to the specified target buffer, without
+  /// removing the data from the internal buffer. Returns the number of bytes
+  /// copied.
+  template <typename MutableBufferSequence>
+  std::size_t peek_copy(const MutableBufferSequence& buffers)
+  {
+    using namespace std; // For memcpy.
+
+    std::size_t bytes_avail = storage_.size();
+    std::size_t bytes_copied = 0;
+
+    typename MutableBufferSequence::const_iterator iter = buffers.begin();
+    typename MutableBufferSequence::const_iterator end = buffers.end();
+    for (; iter != end && bytes_avail > 0; ++iter)
+    {
+      std::size_t max_length = buffer_size(*iter);
+      std::size_t length = (max_length < bytes_avail)
+        ? max_length : bytes_avail;
+      memcpy(buffer_cast<void*>(*iter), storage_.data() + bytes_copied, length);
+      bytes_copied += length;
+      bytes_avail -= length;
+    }
+
+    return bytes_copied;
+  }
+
+  /// The next layer.
+  Stream next_layer_;
+
+  // The data in the buffer.
+  detail::buffered_stream_storage storage_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFERED_READ_STREAM_HPP
diff --git a/ext/asio/buffered_read_stream_fwd.hpp b/ext/asio/buffered_read_stream_fwd.hpp
new file mode 100644
index 0000000000..5078775d11
--- /dev/null
+++ b/ext/asio/buffered_read_stream_fwd.hpp
@@ -0,0 +1,29 @@
+//
+// buffered_read_stream_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFERED_READ_STREAM_FWD_HPP
+#define ASIO_BUFFERED_READ_STREAM_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+template <typename Stream>
+class buffered_read_stream;
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFERED_READ_STREAM_FWD_HPP
diff --git a/ext/asio/buffered_stream.hpp b/ext/asio/buffered_stream.hpp
new file mode 100644
index 0000000000..23dc9c33f9
--- /dev/null
+++ b/ext/asio/buffered_stream.hpp
@@ -0,0 +1,256 @@
+//
+// buffered_stream.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFERED_STREAM_HPP
+#define ASIO_BUFFERED_STREAM_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffered_read_stream.hpp"
+#include "asio/buffered_write_stream.hpp"
+#include "asio/buffered_stream_fwd.hpp"
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+
+/// Adds buffering to the read- and write-related operations of a stream.
+/**
+ * The buffered_stream class template can be used to add buffering to the
+ * synchronous and asynchronous read and write operations of a stream.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
+ */
+template <typename Stream>
+class buffered_stream
+  : private noncopyable
+{
+public:
+  /// The type of the next layer.
+  typedef typename boost::remove_reference<Stream>::type next_layer_type;
+
+  /// The type of the lowest layer.
+  typedef typename next_layer_type::lowest_layer_type lowest_layer_type;
+
+  /// Construct, passing the specified argument to initialise the next layer.
+  template <typename Arg>
+  explicit buffered_stream(Arg& a)
+    : inner_stream_impl_(a),
+      stream_impl_(inner_stream_impl_)
+  {
+  }
+
+  /// Construct, passing the specified argument to initialise the next layer.
+  template <typename Arg>
+  explicit buffered_stream(Arg& a, std::size_t read_buffer_size,
+      std::size_t write_buffer_size)
+    : inner_stream_impl_(a, write_buffer_size),
+      stream_impl_(inner_stream_impl_, read_buffer_size)
+  {
+  }
+
+  /// Get a reference to the next layer.
+  next_layer_type& next_layer()
+  {
+    return stream_impl_.next_layer().next_layer();
+  }
+
+  /// Get a reference to the lowest layer.
+  lowest_layer_type& lowest_layer()
+  {
+    return stream_impl_.lowest_layer();
+  }
+
+  /// Get a const reference to the lowest layer.
+  const lowest_layer_type& lowest_layer() const
+  {
+    return stream_impl_.lowest_layer();
+  }
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with
+  /// the object.
+  asio::io_service& io_service()
+  {
+    return stream_impl_.get_io_service();
+  }
+
+  /// Get the io_service associated with the object.
+  asio::io_service& get_io_service()
+  {
+    return stream_impl_.get_io_service();
+  }
+
+  /// Close the stream.
+  void close()
+  {
+    stream_impl_.close();
+  }
+
+  /// Close the stream.
+  asio::error_code close(asio::error_code& ec)
+  {
+    return stream_impl_.close(ec);
+  }
+
+  /// Flush all data from the buffer to the next layer. Returns the number of
+  /// bytes written to the next layer on the last write operation. Throws an
+  /// exception on failure.
+  std::size_t flush()
+  {
+    return stream_impl_.next_layer().flush();
+  }
+
+  /// Flush all data from the buffer to the next layer. Returns the number of
+  /// bytes written to the next layer on the last write operation, or 0 if an
+  /// error occurred.
+  std::size_t flush(asio::error_code& ec)
+  {
+    return stream_impl_.next_layer().flush(ec);
+  }
+
+  /// Start an asynchronous flush.
+  template <typename WriteHandler>
+  void async_flush(WriteHandler handler)
+  {
+    return stream_impl_.next_layer().async_flush(handler);
+  }
+
+  /// Write the given data to the stream. Returns the number of bytes written.
+  /// Throws an exception on failure.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    return stream_impl_.write_some(buffers);
+  }
+
+  /// Write the given data to the stream. Returns the number of bytes written,
+  /// or 0 if an error occurred.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return stream_impl_.write_some(buffers, ec);
+  }
+
+  /// Start an asynchronous write. The data being written must be valid for the
+  /// lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    stream_impl_.async_write_some(buffers, handler);
+  }
+
+  /// Fill the buffer with some data. Returns the number of bytes placed in the
+  /// buffer as a result of the operation. Throws an exception on failure.
+  std::size_t fill()
+  {
+    return stream_impl_.fill();
+  }
+
+  /// Fill the buffer with some data. Returns the number of bytes placed in the
+  /// buffer as a result of the operation, or 0 if an error occurred.
+  std::size_t fill(asio::error_code& ec)
+  {
+    return stream_impl_.fill(ec);
+  }
+
+  /// Start an asynchronous fill.
+  template <typename ReadHandler>
+  void async_fill(ReadHandler handler)
+  {
+    stream_impl_.async_fill(handler);
+  }
+
+  /// Read some data from the stream. Returns the number of bytes read. Throws
+  /// an exception on failure.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    return stream_impl_.read_some(buffers);
+  }
+
+  /// Read some data from the stream. Returns the number of bytes read or 0 if
+  /// an error occurred.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return stream_impl_.read_some(buffers, ec);
+  }
+
+  /// Start an asynchronous read. The buffer into which the data will be read
+  /// must be valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    stream_impl_.async_read_some(buffers, handler);
+  }
+
+  /// Peek at the incoming data on the stream. Returns the number of bytes read.
+  /// Throws an exception on failure.
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers)
+  {
+    return stream_impl_.peek(buffers);
+  }
+
+  /// Peek at the incoming data on the stream. Returns the number of bytes read,
+  /// or 0 if an error occurred.
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return stream_impl_.peek(buffers, ec);
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail()
+  {
+    return stream_impl_.in_avail();
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail(asio::error_code& ec)
+  {
+    return stream_impl_.in_avail(ec);
+  }
+
+private:
+  // The buffered write stream.
+  typedef buffered_write_stream<Stream> write_stream_type;
+  write_stream_type inner_stream_impl_;
+
+  // The buffered read stream.
+  typedef buffered_read_stream<write_stream_type&> read_stream_type;
+  read_stream_type stream_impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFERED_STREAM_HPP
diff --git a/ext/asio/buffered_stream_fwd.hpp b/ext/asio/buffered_stream_fwd.hpp
new file mode 100644
index 0000000000..f26cd43c2d
--- /dev/null
+++ b/ext/asio/buffered_stream_fwd.hpp
@@ -0,0 +1,29 @@
+//
+// buffered_stream_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFERED_STREAM_FWD_HPP
+#define ASIO_BUFFERED_STREAM_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+template <typename Stream>
+class buffered_stream;
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFERED_STREAM_FWD_HPP
diff --git a/ext/asio/buffered_write_stream.hpp b/ext/asio/buffered_write_stream.hpp
new file mode 100644
index 0000000000..30a92ce658
--- /dev/null
+++ b/ext/asio/buffered_write_stream.hpp
@@ -0,0 +1,415 @@
+//
+// buffered_write_stream.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFERED_WRITE_STREAM_HPP
+#define ASIO_BUFFERED_WRITE_STREAM_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <cstring>
+#include <boost/config.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffered_write_stream_fwd.hpp"
+#include "asio/buffer.hpp"
+#include "asio/completion_condition.hpp"
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/write.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffered_stream_storage.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+
+/// Adds buffering to the write-related operations of a stream.
+/**
+ * The buffered_write_stream class template can be used to add buffering to the
+ * synchronous and asynchronous write operations of a stream.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
+ */
+template <typename Stream>
+class buffered_write_stream
+  : private noncopyable
+{
+public:
+  /// The type of the next layer.
+  typedef typename boost::remove_reference<Stream>::type next_layer_type;
+
+  /// The type of the lowest layer.
+  typedef typename next_layer_type::lowest_layer_type lowest_layer_type;
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// The default buffer size.
+  static const std::size_t default_buffer_size = implementation_defined;
+#else
+  BOOST_STATIC_CONSTANT(std::size_t, default_buffer_size = 1024);
+#endif
+
+  /// Construct, passing the specified argument to initialise the next layer.
+  template <typename Arg>
+  explicit buffered_write_stream(Arg& a)
+    : next_layer_(a),
+      storage_(default_buffer_size)
+  {
+  }
+
+  /// Construct, passing the specified argument to initialise the next layer.
+  template <typename Arg>
+  buffered_write_stream(Arg& a, std::size_t buffer_size)
+    : next_layer_(a),
+      storage_(buffer_size)
+  {
+  }
+
+  /// Get a reference to the next layer.
+  next_layer_type& next_layer()
+  {
+    return next_layer_;
+  }
+
+  /// Get a reference to the lowest layer.
+  lowest_layer_type& lowest_layer()
+  {
+    return next_layer_.lowest_layer();
+  }
+
+  /// Get a const reference to the lowest layer.
+  const lowest_layer_type& lowest_layer() const
+  {
+    return next_layer_.lowest_layer();
+  }
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with
+  /// the object.
+  asio::io_service& io_service()
+  {
+    return next_layer_.get_io_service();
+  }
+
+  /// Get the io_service associated with the object.
+  asio::io_service& get_io_service()
+  {
+    return next_layer_.get_io_service();
+  }
+
+  /// Close the stream.
+  void close()
+  {
+    next_layer_.close();
+  }
+
+  /// Close the stream.
+  asio::error_code close(asio::error_code& ec)
+  {
+    return next_layer_.close(ec);
+  }
+
+  /// Flush all data from the buffer to the next layer. Returns the number of
+  /// bytes written to the next layer on the last write operation. Throws an
+  /// exception on failure.
+  std::size_t flush()
+  {
+    std::size_t bytes_written = write(next_layer_,
+        buffer(storage_.data(), storage_.size()));
+    storage_.consume(bytes_written);
+    return bytes_written;
+  }
+
+  /// Flush all data from the buffer to the next layer. Returns the number of
+  /// bytes written to the next layer on the last write operation, or 0 if an
+  /// error occurred.
+  std::size_t flush(asio::error_code& ec)
+  {
+    std::size_t bytes_written = write(next_layer_,
+        buffer(storage_.data(), storage_.size()),
+        transfer_all(), ec);
+    storage_.consume(bytes_written);
+    return bytes_written;
+  }
+
+  template <typename WriteHandler>
+  class flush_handler
+  {
+  public:
+    flush_handler(asio::io_service& io_service,
+        detail::buffered_stream_storage& storage, WriteHandler handler)
+      : io_service_(io_service),
+        storage_(storage),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_written)
+    {
+      storage_.consume(bytes_written);
+      io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_written));
+    }
+
+  private:
+    asio::io_service& io_service_;
+    detail::buffered_stream_storage& storage_;
+    WriteHandler handler_;
+  };
+
+  /// Start an asynchronous flush.
+  template <typename WriteHandler>
+  void async_flush(WriteHandler handler)
+  {
+    async_write(next_layer_, buffer(storage_.data(), storage_.size()),
+        flush_handler<WriteHandler>(get_io_service(), storage_, handler));
+  }
+
+  /// Write the given data to the stream. Returns the number of bytes written.
+  /// Throws an exception on failure.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    typename ConstBufferSequence::const_iterator iter = buffers.begin();
+    typename ConstBufferSequence::const_iterator end = buffers.end();
+    size_t total_buffer_size = 0;
+    for (; iter != end; ++iter)
+    {
+      asio::const_buffer buffer(*iter);
+      total_buffer_size += asio::buffer_size(buffer);
+    }
+
+    if (total_buffer_size == 0)
+      return 0;
+
+    if (storage_.size() == storage_.capacity())
+      flush();
+
+    return copy(buffers);
+  }
+
+  /// Write the given data to the stream. Returns the number of bytes written,
+  /// or 0 if an error occurred and the error handler did not throw.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    ec = asio::error_code();
+
+    typename ConstBufferSequence::const_iterator iter = buffers.begin();
+    typename ConstBufferSequence::const_iterator end = buffers.end();
+    size_t total_buffer_size = 0;
+    for (; iter != end; ++iter)
+    {
+      asio::const_buffer buffer(*iter);
+      total_buffer_size += asio::buffer_size(buffer);
+    }
+
+    if (total_buffer_size == 0)
+      return 0;
+
+    if (storage_.size() == storage_.capacity() && !flush(ec))
+      return 0;
+
+    return copy(buffers);
+  }
+
+  template <typename ConstBufferSequence, typename WriteHandler>
+  class write_some_handler
+  {
+  public:
+    write_some_handler(asio::io_service& io_service,
+        detail::buffered_stream_storage& storage,
+        const ConstBufferSequence& buffers, WriteHandler handler)
+      : io_service_(io_service),
+        storage_(storage),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec, std::size_t)
+    {
+      if (ec)
+      {
+        std::size_t length = 0;
+        io_service_.dispatch(detail::bind_handler(handler_, ec, length));
+      }
+      else
+      {
+        using namespace std; // For memcpy.
+
+        std::size_t orig_size = storage_.size();
+        std::size_t space_avail = storage_.capacity() - orig_size;
+        std::size_t bytes_copied = 0;
+
+        typename ConstBufferSequence::const_iterator iter = buffers_.begin();
+        typename ConstBufferSequence::const_iterator end = buffers_.end();
+        for (; iter != end && space_avail > 0; ++iter)
+        {
+          std::size_t bytes_avail = buffer_size(*iter);
+          std::size_t length = (bytes_avail < space_avail)
+            ? bytes_avail : space_avail;
+          storage_.resize(orig_size + bytes_copied + length);
+          memcpy(storage_.data() + orig_size + bytes_copied,
+              buffer_cast<const void*>(*iter), length);
+          bytes_copied += length;
+          space_avail -= length;
+        }
+
+        io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_copied));
+      }
+    }
+
+  private:
+    asio::io_service& io_service_;
+    detail::buffered_stream_storage& storage_;
+    ConstBufferSequence buffers_;
+    WriteHandler handler_;
+  };
+
+  /// Start an asynchronous write. The data being written must be valid for the
+  /// lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    typename ConstBufferSequence::const_iterator iter = buffers.begin();
+    typename ConstBufferSequence::const_iterator end = buffers.end();
+    size_t total_buffer_size = 0;
+    for (; iter != end; ++iter)
+    {
+      asio::const_buffer buffer(*iter);
+      total_buffer_size += asio::buffer_size(buffer);
+    }
+
+    if (total_buffer_size == 0)
+    {
+      get_io_service().post(detail::bind_handler(
+            handler, asio::error_code(), 0));
+    }
+    else if (storage_.size() == storage_.capacity())
+    {
+      async_flush(write_some_handler<ConstBufferSequence, WriteHandler>(
+            get_io_service(), storage_, buffers, handler));
+    }
+    else
+    {
+      std::size_t bytes_copied = copy(buffers);
+      get_io_service().post(detail::bind_handler(
+            handler, asio::error_code(), bytes_copied));
+    }
+  }
+
+  /// Read some data from the stream. Returns the number of bytes read. Throws
+  /// an exception on failure.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    return next_layer_.read_some(buffers);
+  }
+
+  /// Read some data from the stream. Returns the number of bytes read or 0 if
+  /// an error occurred.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return next_layer_.read_some(buffers, ec);
+  }
+
+  /// Start an asynchronous read. The buffer into which the data will be read
+  /// must be valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    next_layer_.async_read_some(buffers, handler);
+  }
+
+  /// Peek at the incoming data on the stream. Returns the number of bytes read.
+  /// Throws an exception on failure.
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers)
+  {
+    return next_layer_.peek(buffers);
+  }
+
+  /// Peek at the incoming data on the stream. Returns the number of bytes read,
+  /// or 0 if an error occurred.
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return next_layer_.peek(buffers, ec);
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail()
+  {
+    return next_layer_.in_avail();
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail(asio::error_code& ec)
+  {
+    return next_layer_.in_avail(ec);
+  }
+
+private:
+  /// Copy data into the internal buffer from the specified source buffer.
+  /// Returns the number of bytes copied.
+  template <typename ConstBufferSequence>
+  std::size_t copy(const ConstBufferSequence& buffers)
+  {
+    using namespace std; // For memcpy.
+
+    std::size_t orig_size = storage_.size();
+    std::size_t space_avail = storage_.capacity() - orig_size;
+    std::size_t bytes_copied = 0;
+
+    typename ConstBufferSequence::const_iterator iter = buffers.begin();
+    typename ConstBufferSequence::const_iterator end = buffers.end();
+    for (; iter != end && space_avail > 0; ++iter)
+    {
+      std::size_t bytes_avail = buffer_size(*iter);
+      std::size_t length = (bytes_avail < space_avail)
+        ? bytes_avail : space_avail;
+      storage_.resize(orig_size + bytes_copied + length);
+      memcpy(storage_.data() + orig_size + bytes_copied,
+          buffer_cast<const void*>(*iter), length);
+      bytes_copied += length;
+      space_avail -= length;
+    }
+
+    return bytes_copied;
+  }
+
+  /// The next layer.
+  Stream next_layer_;
+
+  // The data in the buffer.
+  detail::buffered_stream_storage storage_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFERED_WRITE_STREAM_HPP
diff --git a/ext/asio/buffered_write_stream_fwd.hpp b/ext/asio/buffered_write_stream_fwd.hpp
new file mode 100644
index 0000000000..dc0e014732
--- /dev/null
+++ b/ext/asio/buffered_write_stream_fwd.hpp
@@ -0,0 +1,29 @@
+//
+// buffered_write_stream_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFERED_WRITE_STREAM_FWD_HPP
+#define ASIO_BUFFERED_WRITE_STREAM_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+template <typename Stream>
+class buffered_write_stream;
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFERED_WRITE_STREAM_FWD_HPP
diff --git a/ext/asio/buffers_iterator.hpp b/ext/asio/buffers_iterator.hpp
new file mode 100644
index 0000000000..7da55f2f34
--- /dev/null
+++ b/ext/asio/buffers_iterator.hpp
@@ -0,0 +1,447 @@
+//
+// buffers_iterator.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_BUFFERS_ITERATOR_HPP
+#define ASIO_BUFFERS_ITERATOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/iterator.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffer.hpp"
+
+namespace asio {
+
+namespace detail
+{
+  template <bool IsMutable>
+  struct buffers_iterator_types_helper;
+
+  template <>
+  struct buffers_iterator_types_helper<false>
+  {
+    typedef const_buffer buffer_type;
+    template <typename ByteType>
+    struct byte_type
+    {
+      typedef typename boost::add_const<ByteType>::type type;
+    };
+  };
+
+  template <>
+  struct buffers_iterator_types_helper<true>
+  {
+    typedef mutable_buffer buffer_type;
+    template <typename ByteType>
+    struct byte_type
+    {
+      typedef ByteType type;
+    };
+  };
+
+  template <typename BufferSequence, typename ByteType>
+  struct buffers_iterator_types
+  {
+    enum
+    {
+      is_mutable = boost::is_convertible<
+        typename BufferSequence::value_type, mutable_buffer>::value
+    };
+    typedef buffers_iterator_types_helper<is_mutable> helper;
+    typedef typename helper::buffer_type buffer_type;
+    typedef typename helper::template byte_type<ByteType>::type byte_type;
+  };
+}
+
+/// A random access iterator over the bytes in a buffer sequence.
+template <typename BufferSequence, typename ByteType = char>
+class buffers_iterator
+  : public boost::iterator<
+      std::random_access_iterator_tag,
+      typename detail::buffers_iterator_types<
+        BufferSequence, ByteType>::byte_type>
+{
+private:
+  typedef typename detail::buffers_iterator_types<
+      BufferSequence, ByteType>::buffer_type buffer_type;
+  typedef typename detail::buffers_iterator_types<
+      BufferSequence, ByteType>::byte_type byte_type;
+
+public:
+  /// Default constructor. Creates an iterator in an undefined state.
+  buffers_iterator()
+    : current_buffer_(),
+      current_buffer_position_(0),
+      begin_(),
+      current_(),
+      end_(),
+      position_(0)
+  {
+  }
+
+  /// Construct an iterator representing the beginning of the buffers' data.
+  static buffers_iterator begin(const BufferSequence& buffers)
+#if BOOST_WORKAROUND(__GNUC__, == 4) && BOOST_WORKAROUND(__GNUC_MINOR__, == 3)
+    __attribute__ ((noinline))
+#endif
+  {
+    buffers_iterator new_iter;
+    new_iter.begin_ = buffers.begin();
+    new_iter.current_ = buffers.begin();
+    new_iter.end_ = buffers.end();
+    while (new_iter.current_ != new_iter.end_)
+    {
+      new_iter.current_buffer_ = *new_iter.current_;
+      if (asio::buffer_size(new_iter.current_buffer_) > 0)
+        break;
+      ++new_iter.current_;
+    }
+    return new_iter;
+  }
+
+  /// Construct an iterator representing the end of the buffers' data.
+  static buffers_iterator end(const BufferSequence& buffers)
+#if BOOST_WORKAROUND(__GNUC__, == 4) && BOOST_WORKAROUND(__GNUC_MINOR__, == 3)
+    __attribute__ ((noinline))
+#endif
+  {
+    buffers_iterator new_iter;
+    new_iter.begin_ = buffers.begin();
+    new_iter.current_ = buffers.begin();
+    new_iter.end_ = buffers.end();
+    while (new_iter.current_ != new_iter.end_)
+    {
+      buffer_type buffer = *new_iter.current_;
+      new_iter.position_ += asio::buffer_size(buffer);
+      ++new_iter.current_;
+    }
+    return new_iter;
+  }
+
+  /// Dereference an iterator.
+  byte_type& operator*() const
+  {
+    return dereference();
+  }
+
+  /// Dereference an iterator.
+  byte_type* operator->() const
+  {
+    return &dereference();
+  }
+
+  /// Access an individual element.
+  byte_type& operator[](std::ptrdiff_t difference) const
+  {
+    buffers_iterator tmp(*this);
+    tmp.advance(difference);
+    return *tmp;
+  }
+
+  /// Increment operator (prefix).
+  buffers_iterator& operator++()
+  {
+    increment();
+    return *this;
+  }
+
+  /// Increment operator (postfix).
+  buffers_iterator operator++(int)
+  {
+    buffers_iterator tmp(*this);
+    ++*this;
+    return tmp;
+  }
+
+  /// Decrement operator (prefix).
+  buffers_iterator& operator--()
+  {
+    decrement();
+    return *this;
+  }
+
+  /// Decrement operator (postfix).
+  buffers_iterator operator--(int)
+  {
+    buffers_iterator tmp(*this);
+    --*this;
+    return tmp;
+  }
+
+  /// Addition operator.
+  buffers_iterator& operator+=(std::ptrdiff_t difference)
+  {
+    advance(difference);
+    return *this;
+  }
+
+  /// Subtraction operator.
+  buffers_iterator& operator-=(std::ptrdiff_t difference)
+  {
+    advance(-difference);
+    return *this;
+  }
+
+  /// Addition operator.
+  friend buffers_iterator operator+(const buffers_iterator& iter,
+      std::ptrdiff_t difference)
+  {
+    buffers_iterator tmp(iter);
+    tmp.advance(difference);
+    return tmp;
+  }
+
+  /// Subtraction operator.
+  friend buffers_iterator operator-(const buffers_iterator& iter,
+      std::ptrdiff_t difference)
+  {
+    buffers_iterator tmp(iter);
+    tmp.advance(-difference);
+    return tmp;
+  }
+
+  /// Subtraction operator.
+  friend std::ptrdiff_t operator-(const buffers_iterator& a,
+      const buffers_iterator& b)
+  {
+    return b.distance_to(a);
+  }
+
+  /// Test two iterators for equality.
+  friend bool operator==(const buffers_iterator& a, const buffers_iterator& b)
+  {
+    return a.equal(b);
+  }
+
+  /// Test two iterators for inequality.
+  friend bool operator!=(const buffers_iterator& a, const buffers_iterator& b)
+  {
+    return !a.equal(b);
+  }
+
+  /// Compare two iterators.
+  friend bool operator<(const buffers_iterator& a, const buffers_iterator& b)
+  {
+    return a.distance_to(b) > 0;
+  }
+
+  /// Compare two iterators.
+  friend bool operator<=(const buffers_iterator& a, const buffers_iterator& b)
+  {
+    return !(b < a);
+  }
+
+  /// Compare two iterators.
+  friend bool operator>(const buffers_iterator& a, const buffers_iterator& b)
+  {
+    return b < a;
+  }
+
+  /// Compare two iterators.
+  friend bool operator>=(const buffers_iterator& a, const buffers_iterator& b)
+  {
+    return !(a < b);
+  }
+
+private:
+  // Dereference the iterator.
+  byte_type& dereference() const
+  {
+    return buffer_cast<byte_type*>(current_buffer_)[current_buffer_position_];
+  }
+
+  // Compare two iterators for equality.
+  bool equal(const buffers_iterator& other) const
+  {
+    return position_ == other.position_;
+  }
+
+  // Increment the iterator.
+  void increment()
+  {
+    BOOST_ASSERT(current_ != end_ && "iterator out of bounds");
+    ++position_;
+
+    // Check if the increment can be satisfied by the current buffer.
+    ++current_buffer_position_;
+    if (current_buffer_position_ != asio::buffer_size(current_buffer_))
+      return;
+
+    // Find the next non-empty buffer.
+    ++current_;
+    current_buffer_position_ = 0;
+    while (current_ != end_)
+    {
+      current_buffer_ = *current_;
+      if (asio::buffer_size(current_buffer_) > 0)
+        return;
+      ++current_;
+    }
+  }
+
+  // Decrement the iterator.
+  void decrement()
+  {
+    BOOST_ASSERT(position_ > 0 && "iterator out of bounds");
+    --position_;
+
+    // Check if the decrement can be satisfied by the current buffer.
+    if (current_buffer_position_ != 0)
+    {
+      --current_buffer_position_;
+      return;
+    }
+
+    // Find the previous non-empty buffer.
+    typename BufferSequence::const_iterator iter = current_;
+    while (iter != begin_)
+    {
+      --iter;
+      buffer_type buffer = *iter;
+      std::size_t buffer_size = asio::buffer_size(buffer);
+      if (buffer_size > 0)
+      {
+        current_ = iter;
+        current_buffer_ = buffer;
+        current_buffer_position_ = buffer_size - 1;
+        return;
+      }
+    }
+  }
+
+  // Advance the iterator by the specified distance.
+  void advance(std::ptrdiff_t n)
+  {
+    if (n > 0)
+    {
+      BOOST_ASSERT(current_ != end_ && "iterator out of bounds");
+      for (;;)
+      {
+        std::ptrdiff_t current_buffer_balance
+          = asio::buffer_size(current_buffer_)
+          - current_buffer_position_;
+
+        // Check if the advance can be satisfied by the current buffer.
+        if (current_buffer_balance > n)
+        {
+          position_ += n;
+          current_buffer_position_ += n;
+          return;
+        }
+
+        // Update position.
+        n -= current_buffer_balance;
+        position_ += current_buffer_balance;
+
+        // Move to next buffer. If it is empty then it will be skipped on the
+        // next iteration of this loop.
+        if (++current_ == end_)
+        {
+          BOOST_ASSERT(n == 0 && "iterator out of bounds");
+          current_buffer_ = buffer_type();
+          current_buffer_position_ = 0;
+          return;
+        }
+        current_buffer_ = *current_;
+        current_buffer_position_ = 0;
+      }
+    }
+    else if (n < 0)
+    {
+      std::size_t abs_n = -n;
+      BOOST_ASSERT(position_ >= abs_n && "iterator out of bounds");
+      for (;;)
+      {
+        // Check if the advance can be satisfied by the current buffer.
+        if (current_buffer_position_ >= abs_n)
+        {
+          position_ -= abs_n;
+          current_buffer_position_ -= abs_n;
+          return;
+        }
+
+        // Update position.
+        abs_n -= current_buffer_position_;
+        position_ -= current_buffer_position_;
+
+        // Check if we've reached the beginning of the buffers.
+        if (current_ == begin_)
+        {
+          BOOST_ASSERT(abs_n == 0 && "iterator out of bounds");
+          current_buffer_position_ = 0;
+          return;
+        }
+
+        // Find the previous non-empty buffer.
+        typename BufferSequence::const_iterator iter = current_;
+        while (iter != begin_)
+        {
+          --iter;
+          buffer_type buffer = *iter;
+          std::size_t buffer_size = asio::buffer_size(buffer);
+          if (buffer_size > 0)
+          {
+            current_ = iter;
+            current_buffer_ = buffer;
+            current_buffer_position_ = buffer_size;
+            break;
+          }
+        }
+      }
+    }
+  }
+
+  // Determine the distance between two iterators.
+  std::ptrdiff_t distance_to(const buffers_iterator& other) const
+  {
+    return other.position_ - position_;
+  }
+
+  buffer_type current_buffer_;
+  std::size_t current_buffer_position_;
+  typename BufferSequence::const_iterator begin_;
+  typename BufferSequence::const_iterator current_;
+  typename BufferSequence::const_iterator end_;
+  std::size_t position_;
+};
+
+/// Construct an iterator representing the beginning of the buffers' data.
+template <typename BufferSequence>
+inline buffers_iterator<BufferSequence> buffers_begin(
+    const BufferSequence& buffers)
+{
+  return buffers_iterator<BufferSequence>::begin(buffers);
+}
+
+/// Construct an iterator representing the end of the buffers' data.
+template <typename BufferSequence>
+inline buffers_iterator<BufferSequence> buffers_end(
+    const BufferSequence& buffers)
+{
+  return buffers_iterator<BufferSequence>::end(buffers);
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_BUFFERS_ITERATOR_HPP
diff --git a/ext/asio/completion_condition.hpp b/ext/asio/completion_condition.hpp
new file mode 100644
index 0000000000..d4e631d035
--- /dev/null
+++ b/ext/asio/completion_condition.hpp
@@ -0,0 +1,164 @@
+//
+// completion_condition.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_COMPLETION_CONDITION_HPP
+#define ASIO_COMPLETION_CONDITION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+
+namespace detail {
+
+// The default maximum number of bytes to transfer in a single operation.
+enum { default_max_transfer_size = 65536 };
+
+// Adapt result of old-style completion conditions (which had a bool result
+// where true indicated that the operation was complete).
+inline std::size_t adapt_completion_condition_result(bool result)
+{
+  return result ? 0 : default_max_transfer_size;
+}
+
+// Adapt result of current completion conditions (which have a size_t result
+// where 0 means the operation is complete, and otherwise the result is the
+// maximum number of bytes to transfer on the next underlying operation).
+inline std::size_t adapt_completion_condition_result(std::size_t result)
+{
+  return result;
+}
+
+class transfer_all_t
+{
+public:
+  typedef std::size_t result_type;
+
+  template <typename Error>
+  std::size_t operator()(const Error& err, std::size_t)
+  {
+    return !!err ? 0 : default_max_transfer_size;
+  }
+};
+
+class transfer_at_least_t
+{
+public:
+  typedef std::size_t result_type;
+
+  explicit transfer_at_least_t(std::size_t minimum)
+    : minimum_(minimum)
+  {
+  }
+
+  template <typename Error>
+  std::size_t operator()(const Error& err, std::size_t bytes_transferred)
+  {
+    return (!!err || bytes_transferred >= minimum_)
+      ? 0 : default_max_transfer_size;
+  }
+
+private:
+  std::size_t minimum_;
+};
+
+} // namespace detail
+
+/**
+ * @defgroup completion_condition Completion Condition Function Objects
+ *
+ * Function objects used for determining when a read or write operation should
+ * complete.
+ */
+/*@{*/
+
+/// Return a completion condition function object that indicates that a read or
+/// write operation should continue until all of the data has been transferred,
+/// or until an error occurs.
+/**
+ * This function is used to create an object, of unspecified type, that meets
+ * CompletionCondition requirements.
+ *
+ * @par Example
+ * Reading until a buffer is full:
+ * @code
+ * boost::array<char, 128> buf;
+ * asio::error_code ec;
+ * std::size_t n = asio::read(
+ *     sock, asio::buffer(buf),
+ *     asio::transfer_all(), ec);
+ * if (ec)
+ * {
+ *   // An error occurred.
+ * }
+ * else
+ * {
+ *   // n == 128
+ * }
+ * @endcode
+ */
+#if defined(GENERATING_DOCUMENTATION)
+unspecified transfer_all();
+#else
+inline detail::transfer_all_t transfer_all()
+{
+  return detail::transfer_all_t();
+}
+#endif
+
+/// Return a completion condition function object that indicates that a read or
+/// write operation should continue until a minimum number of bytes has been
+/// transferred, or until an error occurs.
+/**
+ * This function is used to create an object, of unspecified type, that meets
+ * CompletionCondition requirements.
+ *
+ * @par Example
+ * Reading until a buffer is full or contains at least 64 bytes:
+ * @code
+ * boost::array<char, 128> buf;
+ * asio::error_code ec;
+ * std::size_t n = asio::read(
+ *     sock, asio::buffer(buf),
+ *     asio::transfer_at_least(64), ec);
+ * if (ec)
+ * {
+ *   // An error occurred.
+ * }
+ * else
+ * {
+ *   // n >= 64 && n <= 128
+ * }
+ * @endcode
+ */
+#if defined(GENERATING_DOCUMENTATION)
+unspecified transfer_at_least(std::size_t minimum);
+#else
+inline detail::transfer_at_least_t transfer_at_least(std::size_t minimum)
+{
+  return detail::transfer_at_least_t(minimum);
+}
+#endif
+
+/*@}*/
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_COMPLETION_CONDITION_HPP
diff --git a/ext/asio/datagram_socket_service.hpp b/ext/asio/datagram_socket_service.hpp
new file mode 100644
index 0000000000..7d135eed7c
--- /dev/null
+++ b/ext/asio/datagram_socket_service.hpp
@@ -0,0 +1,315 @@
+//
+// datagram_socket_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DATAGRAM_SOCKET_SERVICE_HPP
+#define ASIO_DATAGRAM_SOCKET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_socket_service.hpp"
+#else
+# include "asio/detail/reactive_socket_service.hpp"
+#endif
+
+namespace asio {
+
+/// Default service implementation for a datagram socket.
+template <typename Protocol>
+class datagram_socket_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<datagram_socket_service<Protocol> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+private:
+  // The type of the platform-specific implementation.
+#if defined(ASIO_HAS_IOCP)
+  typedef detail::win_iocp_socket_service<Protocol> service_impl_type;
+#else
+  typedef detail::reactive_socket_service<Protocol> service_impl_type;
+#endif
+
+public:
+  /// The type of a datagram socket.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native socket type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef typename service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new datagram socket service for the specified io_service.
+  explicit datagram_socket_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        datagram_socket_service<Protocol> >(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new datagram socket implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a datagram socket implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  // Open a new datagram socket implementation.
+  asio::error_code open(implementation_type& impl,
+      const protocol_type& protocol, asio::error_code& ec)
+  {
+    if (protocol.type() == SOCK_DGRAM)
+      service_impl_.open(impl, protocol, ec);
+    else
+      ec = asio::error::invalid_argument;
+    return ec;
+  }
+
+  /// Assign an existing native socket to a datagram socket.
+  asio::error_code assign(implementation_type& impl,
+      const protocol_type& protocol, const native_type& native_socket,
+      asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, protocol, native_socket, ec);
+  }
+
+  /// Determine whether the socket is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Close a datagram socket implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native socket implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the socket.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Determine whether the socket is at the out-of-band data mark.
+  bool at_mark(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.at_mark(impl, ec);
+  }
+
+  /// Determine the number of bytes available for reading.
+  std::size_t available(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.available(impl, ec);
+  }
+
+  // Bind the datagram socket to the specified local endpoint.
+  asio::error_code bind(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    return service_impl_.bind(impl, endpoint, ec);
+  }
+
+  /// Connect the datagram socket to the specified endpoint.
+  asio::error_code connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, asio::error_code& ec)
+  {
+    return service_impl_.connect(impl, peer_endpoint, ec);
+  }
+
+  /// Start an asynchronous connect.
+  template <typename ConnectHandler>
+  void async_connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, ConnectHandler handler)
+  {
+    service_impl_.async_connect(impl, peer_endpoint, handler);
+  }
+
+  /// Set a socket option.
+  template <typename SettableSocketOption>
+  asio::error_code set_option(implementation_type& impl,
+      const SettableSocketOption& option, asio::error_code& ec)
+  {
+    return service_impl_.set_option(impl, option, ec);
+  }
+
+  /// Get a socket option.
+  template <typename GettableSocketOption>
+  asio::error_code get_option(const implementation_type& impl,
+      GettableSocketOption& option, asio::error_code& ec) const
+  {
+    return service_impl_.get_option(impl, option, ec);
+  }
+
+  /// Perform an IO control command on the socket.
+  template <typename IoControlCommand>
+  asio::error_code io_control(implementation_type& impl,
+      IoControlCommand& command, asio::error_code& ec)
+  {
+    return service_impl_.io_control(impl, command, ec);
+  }
+
+  /// Get the local endpoint.
+  endpoint_type local_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.local_endpoint(impl, ec);
+  }
+
+  /// Get the remote endpoint.
+  endpoint_type remote_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.remote_endpoint(impl, ec);
+  }
+
+  /// Disable sends or receives on the socket.
+  asio::error_code shutdown(implementation_type& impl,
+      socket_base::shutdown_type what, asio::error_code& ec)
+  {
+    return service_impl_.shutdown(impl, what, ec);
+  }
+
+  /// Send the given data to the peer.
+  template <typename ConstBufferSequence>
+  std::size_t send(implementation_type& impl,
+      const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.send(impl, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(implementation_type& impl, const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    service_impl_.async_send(impl, buffers, flags, handler);
+  }
+
+  /// Send a datagram to the specified endpoint.
+  template <typename ConstBufferSequence>
+  std::size_t send_to(implementation_type& impl,
+      const ConstBufferSequence& buffers, const endpoint_type& destination,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.send_to(impl, buffers, destination, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send_to(implementation_type& impl,
+      const ConstBufferSequence& buffers, const endpoint_type& destination,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    service_impl_.async_send_to(impl, buffers, destination, flags, handler);
+  }
+
+  /// Receive some data from the peer.
+  template <typename MutableBufferSequence>
+  std::size_t receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.receive(impl, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous receive.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    service_impl_.async_receive(impl, buffers, flags, handler);
+  }
+
+  /// Receive a datagram with the endpoint of the sender.
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.receive_from(impl, buffers, sender_endpoint, flags,
+        ec);
+  }
+
+  /// Start an asynchronous receive that will get the endpoint of the sender.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    service_impl_.async_receive_from(impl, buffers, sender_endpoint, flags,
+        handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DATAGRAM_SOCKET_SERVICE_HPP
diff --git a/ext/asio/deadline_timer.hpp b/ext/asio/deadline_timer.hpp
new file mode 100644
index 0000000000..e0905f289d
--- /dev/null
+++ b/ext/asio/deadline_timer.hpp
@@ -0,0 +1,37 @@
+//
+// deadline_timer.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DEADLINE_TIMER_HPP
+#define ASIO_DEADLINE_TIMER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/socket_types.hpp" // Must come before posix_time.
+
+#include "asio/detail/push_options.hpp"
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_deadline_timer.hpp"
+
+namespace asio {
+
+/// Typedef for the typical usage of timer. Uses a UTC clock.
+typedef basic_deadline_timer<boost::posix_time::ptime> deadline_timer;
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DEADLINE_TIMER_HPP
diff --git a/ext/asio/deadline_timer_service.hpp b/ext/asio/deadline_timer_service.hpp
new file mode 100644
index 0000000000..284a690ffb
--- /dev/null
+++ b/ext/asio/deadline_timer_service.hpp
@@ -0,0 +1,150 @@
+//
+// deadline_timer_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DEADLINE_TIMER_SERVICE_HPP
+#define ASIO_DEADLINE_TIMER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/time_traits.hpp"
+#include "asio/detail/deadline_timer_service.hpp"
+#include "asio/detail/service_base.hpp"
+
+namespace asio {
+
+/// Default service implementation for a timer.
+template <typename TimeType,
+    typename TimeTraits = asio::time_traits<TimeType> >
+class deadline_timer_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<
+      deadline_timer_service<TimeType, TimeTraits> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The time traits type.
+  typedef TimeTraits traits_type;
+
+  /// The time type.
+  typedef typename traits_type::time_type time_type;
+
+  /// The duration type.
+  typedef typename traits_type::duration_type duration_type;
+
+private:
+  // The type of the platform-specific implementation.
+  typedef detail::deadline_timer_service<traits_type> service_impl_type;
+
+public:
+  /// The implementation type of the deadline timer.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// Construct a new timer service for the specified io_service.
+  explicit deadline_timer_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        deadline_timer_service<TimeType, TimeTraits> >(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new timer implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a timer implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Cancel any asynchronous wait operations associated with the timer.
+  std::size_t cancel(implementation_type& impl, asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Get the expiry time for the timer as an absolute time.
+  time_type expires_at(const implementation_type& impl) const
+  {
+    return service_impl_.expires_at(impl);
+  }
+
+  /// Set the expiry time for the timer as an absolute time.
+  std::size_t expires_at(implementation_type& impl,
+      const time_type& expiry_time, asio::error_code& ec)
+  {
+    return service_impl_.expires_at(impl, expiry_time, ec);
+  }
+
+  /// Get the expiry time for the timer relative to now.
+  duration_type expires_from_now(const implementation_type& impl) const
+  {
+    return service_impl_.expires_from_now(impl);
+  }
+
+  /// Set the expiry time for the timer relative to now.
+  std::size_t expires_from_now(implementation_type& impl,
+      const duration_type& expiry_time, asio::error_code& ec)
+  {
+    return service_impl_.expires_from_now(impl, expiry_time, ec);
+  }
+
+  // Perform a blocking wait on the timer.
+  void wait(implementation_type& impl, asio::error_code& ec)
+  {
+    service_impl_.wait(impl, ec);
+  }
+
+  // Start an asynchronous wait on the timer.
+  template <typename WaitHandler>
+  void async_wait(implementation_type& impl, WaitHandler handler)
+  {
+    service_impl_.async_wait(impl, handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DEADLINE_TIMER_SERVICE_HPP
diff --git a/ext/asio/detail/base_from_completion_cond.hpp b/ext/asio/detail/base_from_completion_cond.hpp
new file mode 100644
index 0000000000..90a11f9900
--- /dev/null
+++ b/ext/asio/detail/base_from_completion_cond.hpp
@@ -0,0 +1,65 @@
+//
+// base_from_completion_cond.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_BASE_FROM_COMPLETION_COND_HPP
+#define ASIO_DETAIL_BASE_FROM_COMPLETION_COND_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/completion_condition.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename CompletionCondition>
+class base_from_completion_cond
+{
+protected:
+  explicit base_from_completion_cond(CompletionCondition completion_condition)
+    : completion_condition_(completion_condition)
+  {
+  }
+
+  std::size_t check(const asio::error_code& ec,
+      std::size_t total_transferred)
+  {
+    return detail::adapt_completion_condition_result(
+        completion_condition_(ec, total_transferred));
+  }
+
+private:
+  CompletionCondition completion_condition_;
+};
+
+template <>
+class base_from_completion_cond<transfer_all_t>
+{
+protected:
+  explicit base_from_completion_cond(transfer_all_t)
+  {
+  }
+
+  static std::size_t check(const asio::error_code& ec,
+      std::size_t total_transferred)
+  {
+    return transfer_all_t()(ec, total_transferred);
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_BASE_FROM_COMPLETION_COND_HPP
diff --git a/ext/asio/detail/bind_handler.hpp b/ext/asio/detail/bind_handler.hpp
new file mode 100644
index 0000000000..5d9eb004ae
--- /dev/null
+++ b/ext/asio/detail/bind_handler.hpp
@@ -0,0 +1,349 @@
+//
+// bind_handler.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_BIND_HANDLER_HPP
+#define ASIO_DETAIL_BIND_HANDLER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Handler, typename Arg1>
+class binder1
+{
+public:
+  binder1(const Handler& handler, const Arg1& arg1)
+    : handler_(handler),
+      arg1_(arg1)
+  {
+  }
+
+  void operator()()
+  {
+    handler_(arg1_);
+  }
+
+  void operator()() const
+  {
+    handler_(arg1_);
+  }
+
+//private:
+  Handler handler_;
+  Arg1 arg1_;
+};
+
+template <typename Handler, typename Arg1>
+inline void* asio_handler_allocate(std::size_t size,
+    binder1<Handler, Arg1>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    binder1<Handler, Arg1>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+}
+
+template <typename Function, typename Handler, typename Arg1>
+inline void asio_handler_invoke(const Function& function,
+    binder1<Handler, Arg1>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1>
+inline binder1<Handler, Arg1> bind_handler(const Handler& handler,
+    const Arg1& arg1)
+{
+  return binder1<Handler, Arg1>(handler, arg1);
+}
+
+template <typename Handler, typename Arg1, typename Arg2>
+class binder2
+{
+public:
+  binder2(const Handler& handler, const Arg1& arg1, const Arg2& arg2)
+    : handler_(handler),
+      arg1_(arg1),
+      arg2_(arg2)
+  {
+  }
+
+  void operator()()
+  {
+    handler_(arg1_, arg2_);
+  }
+
+  void operator()() const
+  {
+    handler_(arg1_, arg2_);
+  }
+
+//private:
+  Handler handler_;
+  Arg1 arg1_;
+  Arg2 arg2_;
+};
+
+template <typename Handler, typename Arg1, typename Arg2>
+inline void* asio_handler_allocate(std::size_t size,
+    binder2<Handler, Arg1, Arg2>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    binder2<Handler, Arg1, Arg2>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+}
+
+template <typename Function, typename Handler, typename Arg1, typename Arg2>
+inline void asio_handler_invoke(const Function& function,
+    binder2<Handler, Arg1, Arg2>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2>
+inline binder2<Handler, Arg1, Arg2> bind_handler(const Handler& handler,
+    const Arg1& arg1, const Arg2& arg2)
+{
+  return binder2<Handler, Arg1, Arg2>(handler, arg1, arg2);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3>
+class binder3
+{
+public:
+  binder3(const Handler& handler, const Arg1& arg1, const Arg2& arg2,
+      const Arg3& arg3)
+    : handler_(handler),
+      arg1_(arg1),
+      arg2_(arg2),
+      arg3_(arg3)
+  {
+  }
+
+  void operator()()
+  {
+    handler_(arg1_, arg2_, arg3_);
+  }
+
+  void operator()() const
+  {
+    handler_(arg1_, arg2_, arg3_);
+  }
+
+//private:
+  Handler handler_;
+  Arg1 arg1_;
+  Arg2 arg2_;
+  Arg3 arg3_;
+};
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3>
+inline void* asio_handler_allocate(std::size_t size,
+    binder3<Handler, Arg1, Arg2, Arg3>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    binder3<Handler, Arg1, Arg2, Arg3>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+}
+
+template <typename Function, typename Handler, typename Arg1, typename Arg2,
+    typename Arg3>
+inline void asio_handler_invoke(const Function& function,
+    binder3<Handler, Arg1, Arg2, Arg3>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3>
+inline binder3<Handler, Arg1, Arg2, Arg3> bind_handler(const Handler& handler,
+    const Arg1& arg1, const Arg2& arg2, const Arg3& arg3)
+{
+  return binder3<Handler, Arg1, Arg2, Arg3>(handler, arg1, arg2, arg3);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4>
+class binder4
+{
+public:
+  binder4(const Handler& handler, const Arg1& arg1, const Arg2& arg2,
+      const Arg3& arg3, const Arg4& arg4)
+    : handler_(handler),
+      arg1_(arg1),
+      arg2_(arg2),
+      arg3_(arg3),
+      arg4_(arg4)
+  {
+  }
+
+  void operator()()
+  {
+    handler_(arg1_, arg2_, arg3_, arg4_);
+  }
+
+  void operator()() const
+  {
+    handler_(arg1_, arg2_, arg3_, arg4_);
+  }
+
+//private:
+  Handler handler_;
+  Arg1 arg1_;
+  Arg2 arg2_;
+  Arg3 arg3_;
+  Arg4 arg4_;
+};
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4>
+inline void* asio_handler_allocate(std::size_t size,
+    binder4<Handler, Arg1, Arg2, Arg3, Arg4>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    binder4<Handler, Arg1, Arg2, Arg3, Arg4>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+}
+
+template <typename Function, typename Handler, typename Arg1, typename Arg2,
+    typename Arg3, typename Arg4>
+inline void asio_handler_invoke(const Function& function,
+    binder4<Handler, Arg1, Arg2, Arg3, Arg4>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4>
+inline binder4<Handler, Arg1, Arg2, Arg3, Arg4> bind_handler(
+    const Handler& handler, const Arg1& arg1, const Arg2& arg2,
+    const Arg3& arg3, const Arg4& arg4)
+{
+  return binder4<Handler, Arg1, Arg2, Arg3, Arg4>(handler, arg1, arg2, arg3,
+      arg4);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4, typename Arg5>
+class binder5
+{
+public:
+  binder5(const Handler& handler, const Arg1& arg1, const Arg2& arg2,
+      const Arg3& arg3, const Arg4& arg4, const Arg5& arg5)
+    : handler_(handler),
+      arg1_(arg1),
+      arg2_(arg2),
+      arg3_(arg3),
+      arg4_(arg4),
+      arg5_(arg5)
+  {
+  }
+
+  void operator()()
+  {
+    handler_(arg1_, arg2_, arg3_, arg4_, arg5_);
+  }
+
+  void operator()() const
+  {
+    handler_(arg1_, arg2_, arg3_, arg4_, arg5_);
+  }
+
+//private:
+  Handler handler_;
+  Arg1 arg1_;
+  Arg2 arg2_;
+  Arg3 arg3_;
+  Arg4 arg4_;
+  Arg5 arg5_;
+};
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4, typename Arg5>
+inline void* asio_handler_allocate(std::size_t size,
+    binder5<Handler, Arg1, Arg2, Arg3, Arg4, Arg5>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4, typename Arg5>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    binder5<Handler, Arg1, Arg2, Arg3, Arg4, Arg5>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+}
+
+template <typename Function, typename Handler, typename Arg1, typename Arg2,
+    typename Arg3, typename Arg4, typename Arg5>
+inline void asio_handler_invoke(const Function& function,
+    binder5<Handler, Arg1, Arg2, Arg3, Arg4, Arg5>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+}
+
+template <typename Handler, typename Arg1, typename Arg2, typename Arg3,
+    typename Arg4, typename Arg5>
+inline binder5<Handler, Arg1, Arg2, Arg3, Arg4, Arg5> bind_handler(
+    const Handler& handler, const Arg1& arg1, const Arg2& arg2,
+    const Arg3& arg3, const Arg4& arg4, const Arg5& arg5)
+{
+  return binder5<Handler, Arg1, Arg2, Arg3, Arg4, Arg5>(handler, arg1, arg2,
+      arg3, arg4, arg5);
+}
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_BIND_HANDLER_HPP
diff --git a/ext/asio/detail/buffer_resize_guard.hpp b/ext/asio/detail/buffer_resize_guard.hpp
new file mode 100644
index 0000000000..368de323fe
--- /dev/null
+++ b/ext/asio/detail/buffer_resize_guard.hpp
@@ -0,0 +1,70 @@
+//
+// buffer_resize_guard.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_BUFFER_RESIZE_GUARD_HPP
+#define ASIO_DETAIL_BUFFER_RESIZE_GUARD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/limits.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+// Helper class to manage buffer resizing in an exception safe way.
+template <typename Buffer>
+class buffer_resize_guard
+{
+public:
+  // Constructor.
+  buffer_resize_guard(Buffer& buffer)
+    : buffer_(buffer),
+      old_size_(buffer.size())
+  {
+  }
+
+  // Destructor rolls back the buffer resize unless commit was called.
+  ~buffer_resize_guard()
+  {
+    if (old_size_
+        != std::numeric_limits<size_t>::max BOOST_PREVENT_MACRO_SUBSTITUTION())
+    {
+      buffer_.resize(old_size_);
+    }
+  }
+
+  // Commit the resize transaction.
+  void commit()
+  {
+    old_size_
+      = std::numeric_limits<size_t>::max BOOST_PREVENT_MACRO_SUBSTITUTION();
+  }
+
+private:
+  // The buffer being managed.
+  Buffer& buffer_;
+
+  // The size of the buffer at the time the guard was constructed.
+  size_t old_size_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_BUFFER_RESIZE_GUARD_HPP
diff --git a/ext/asio/detail/buffer_sequence_adapter.hpp b/ext/asio/detail/buffer_sequence_adapter.hpp
new file mode 100644
index 0000000000..6269d6ae28
--- /dev/null
+++ b/ext/asio/detail/buffer_sequence_adapter.hpp
@@ -0,0 +1,252 @@
+//
+// buffer_sequence_adapter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
+#define ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/buffer.hpp"
+
+namespace asio {
+namespace detail {
+
+class buffer_sequence_adapter_base
+{
+protected:
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  typedef WSABUF native_buffer_type;
+
+  static void init_native_buffer(WSABUF& buf,
+      const asio::mutable_buffer& buffer)
+  {
+    buf.buf = asio::buffer_cast<char*>(buffer);
+    buf.len = asio::buffer_size(buffer);
+  }
+
+  static void init_native_buffer(WSABUF& buf,
+      const asio::const_buffer& buffer)
+  {
+    buf.buf = const_cast<char*>(asio::buffer_cast<const char*>(buffer));
+    buf.len = asio::buffer_size(buffer);
+  }
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  typedef iovec native_buffer_type;
+
+  static void init_iov_base(void*& base, void* addr)
+  {
+    base = addr;
+  }
+
+  template <typename T>
+  static void init_iov_base(T& base, void* addr)
+  {
+    base = static_cast<T>(addr);
+  }
+
+  static void init_native_buffer(iovec& iov,
+      const asio::mutable_buffer& buffer)
+  {
+    init_iov_base(iov.iov_base, asio::buffer_cast<void*>(buffer));
+    iov.iov_len = asio::buffer_size(buffer);
+  }
+
+  static void init_native_buffer(iovec& iov,
+      const asio::const_buffer& buffer)
+  {
+    init_iov_base(iov.iov_base, const_cast<void*>(
+          asio::buffer_cast<const void*>(buffer)));
+    iov.iov_len = asio::buffer_size(buffer);
+  }
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+};
+
+// Helper class to translate buffers into the native buffer representation.
+template <typename Buffer, typename Buffers>
+class buffer_sequence_adapter
+  : buffer_sequence_adapter_base
+{
+public:
+  explicit buffer_sequence_adapter(const Buffers& buffers)
+    : count_(0), total_buffer_size_(0)
+  {
+    typename Buffers::const_iterator iter = buffers.begin();
+    typename Buffers::const_iterator end = buffers.end();
+    for (; iter != end && count_ < max_buffers; ++iter, ++count_)
+    {
+      Buffer buffer(*iter);
+      init_native_buffer(buffers_[count_], buffer);
+      total_buffer_size_ += asio::buffer_size(buffer);
+    }
+  }
+
+  native_buffer_type* buffers()
+  {
+    return buffers_;
+  }
+
+  std::size_t count() const
+  {
+    return count_;
+  }
+
+  bool all_empty() const
+  {
+    return total_buffer_size_ == 0;
+  }
+
+  static bool all_empty(const Buffers& buffers)
+  {
+    typename Buffers::const_iterator iter = buffers.begin();
+    typename Buffers::const_iterator end = buffers.end();
+    std::size_t i = 0;
+    for (; iter != end && i < max_buffers; ++iter, ++i)
+      if (asio::buffer_size(Buffer(*iter)) > 0)
+        return false;
+    return true;
+  }
+
+  static void validate(const Buffers& buffers)
+  {
+    typename Buffers::const_iterator iter = buffers.begin();
+    typename Buffers::const_iterator end = buffers.end();
+    for (; iter != end; ++iter)
+    {
+      Buffer buffer(*iter);
+      asio::buffer_cast<const void*>(buffer);
+    }
+  }
+
+  static Buffer first(const Buffers& buffers)
+  {
+    typename Buffers::const_iterator iter = buffers.begin();
+    typename Buffers::const_iterator end = buffers.end();
+    for (; iter != end; ++iter)
+    {
+      Buffer buffer(*iter);
+      if (asio::buffer_size(buffer) != 0)
+        return buffer;
+    }
+    return Buffer();
+  }
+
+private:
+  // The maximum number of buffers to support in a single operation.
+  enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len };
+
+  native_buffer_type buffers_[max_buffers];
+  std::size_t count_;
+  std::size_t total_buffer_size_;
+};
+
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, asio::mutable_buffers_1>
+  : buffer_sequence_adapter_base
+{
+public:
+  explicit buffer_sequence_adapter(
+      const asio::mutable_buffers_1& buffers)
+  {
+    init_native_buffer(buffer_, buffers);
+    total_buffer_size_ = asio::buffer_size(buffers);
+  }
+
+  native_buffer_type* buffers()
+  {
+    return &buffer_;
+  }
+
+  std::size_t count() const
+  {
+    return 1;
+  }
+
+  bool all_empty() const
+  {
+    return total_buffer_size_ == 0;
+  }
+
+  static bool all_empty(const asio::mutable_buffers_1& buffers)
+  {
+    return asio::buffer_size(buffers) == 0;
+  }
+
+  static void validate(const asio::mutable_buffers_1& buffers)
+  {
+    asio::buffer_cast<const void*>(buffers);
+  }
+
+  static Buffer first(const asio::mutable_buffers_1& buffers)
+  {
+    return Buffer(buffers);
+  }
+
+private:
+  native_buffer_type buffer_;
+  std::size_t total_buffer_size_;
+};
+
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, asio::const_buffers_1>
+  : buffer_sequence_adapter_base
+{
+public:
+  explicit buffer_sequence_adapter(
+      const asio::const_buffers_1& buffers)
+  {
+    init_native_buffer(buffer_, buffers);
+    total_buffer_size_ = asio::buffer_size(buffers);
+  }
+
+  native_buffer_type* buffers()
+  {
+    return &buffer_;
+  }
+
+  std::size_t count() const
+  {
+    return 1;
+  }
+
+  bool all_empty() const
+  {
+    return total_buffer_size_ == 0;
+  }
+
+  static bool all_empty(const asio::const_buffers_1& buffers)
+  {
+    return asio::buffer_size(buffers) == 0;
+  }
+
+  static void validate(const asio::const_buffers_1& buffers)
+  {
+    asio::buffer_cast<const void*>(buffers);
+  }
+
+  static Buffer first(const asio::const_buffers_1& buffers)
+  {
+    return Buffer(buffers);
+  }
+
+private:
+  native_buffer_type buffer_;
+  std::size_t total_buffer_size_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
diff --git a/ext/asio/detail/buffered_stream_storage.hpp b/ext/asio/detail/buffered_stream_storage.hpp
new file mode 100644
index 0000000000..51f6556fcb
--- /dev/null
+++ b/ext/asio/detail/buffered_stream_storage.hpp
@@ -0,0 +1,127 @@
+//
+// buffered_stream_storage.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_BUFFERED_STREAM_STORAGE_HPP
+#define ASIO_DETAIL_BUFFERED_STREAM_STORAGE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+#include <vector>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class buffered_stream_storage
+{
+public:
+  // The type of the bytes stored in the buffer.
+  typedef unsigned char byte_type;
+
+  // The type used for offsets into the buffer.
+  typedef std::size_t size_type;
+
+  // Constructor.
+  explicit buffered_stream_storage(std::size_t capacity)
+    : begin_offset_(0),
+      end_offset_(0),
+      buffer_(capacity)
+  {
+  }
+
+  /// Clear the buffer.
+  void clear()
+  {
+    begin_offset_ = 0;
+    end_offset_ = 0;
+  }
+
+  // Return a pointer to the beginning of the unread data.
+  byte_type* data()
+  {
+    return &buffer_[0] + begin_offset_;
+  }
+
+  // Return a pointer to the beginning of the unread data.
+  const byte_type* data() const
+  {
+    return &buffer_[0] + begin_offset_;
+  }
+
+  // Is there no unread data in the buffer.
+  bool empty() const
+  {
+    return begin_offset_ == end_offset_;
+  }
+
+  // Return the amount of unread data the is in the buffer.
+  size_type size() const
+  {
+    return end_offset_ - begin_offset_;
+  }
+
+  // Resize the buffer to the specified length.
+  void resize(size_type length)
+  {
+    assert(length <= capacity());
+    if (begin_offset_ + length <= capacity())
+    {
+      end_offset_ = begin_offset_ + length;
+    }
+    else
+    {
+      using namespace std; // For memmove.
+      memmove(&buffer_[0], &buffer_[0] + begin_offset_, size());
+      end_offset_ = length;
+      begin_offset_ = 0;
+    }
+  }
+
+  // Return the maximum size for data in the buffer.
+  size_type capacity() const
+  {
+    return buffer_.size();
+  }
+
+  // Consume multiple bytes from the beginning of the buffer.
+  void consume(size_type count)
+  {
+    assert(begin_offset_ + count <= end_offset_);
+    begin_offset_ += count;
+    if (empty())
+      clear();
+  }
+
+private:
+  // The offset to the beginning of the unread data.
+  size_type begin_offset_;
+
+  // The offset to the end of the unread data.
+  size_type end_offset_;
+  
+  // The data in the buffer.
+  std::vector<byte_type> buffer_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_BUFFERED_STREAM_STORAGE_HPP
diff --git a/ext/asio/detail/call_stack.hpp b/ext/asio/detail/call_stack.hpp
new file mode 100644
index 0000000000..0e9ddafaa3
--- /dev/null
+++ b/ext/asio/detail/call_stack.hpp
@@ -0,0 +1,90 @@
+//
+// call_stack.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_CALL_STACK_HPP
+#define ASIO_DETAIL_CALL_STACK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/tss_ptr.hpp"
+
+namespace asio {
+namespace detail {
+
+// Helper class to determine whether or not the current thread is inside an
+// invocation of io_service::run() for a specified io_service object.
+template <typename Owner>
+class call_stack
+{
+public:
+  // Context class automatically pushes an owner on to the stack.
+  class context
+    : private noncopyable
+  {
+  public:
+    // Push the owner on to the stack.
+    explicit context(Owner* d)
+      : owner_(d),
+        next_(call_stack<Owner>::top_)
+    {
+      call_stack<Owner>::top_ = this;
+    }
+
+    // Pop the owner from the stack.
+    ~context()
+    {
+      call_stack<Owner>::top_ = next_;
+    }
+
+  private:
+    friend class call_stack<Owner>;
+
+    // The owner associated with the context.
+    Owner* owner_;
+
+    // The next element in the stack.
+    context* next_;
+  };
+
+  friend class context;
+
+  // Determine whether the specified owner is on the stack.
+  static bool contains(Owner* d)
+  {
+    context* elem = top_;
+    while (elem)
+    {
+      if (elem->owner_ == d)
+        return true;
+      elem = elem->next_;
+    }
+    return false;
+  }
+
+private:
+  // The top of the stack of calls for the current thread.
+  static tss_ptr<context> top_;
+};
+
+template <typename Owner>
+tss_ptr<typename call_stack<Owner>::context>
+call_stack<Owner>::top_;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_CALL_STACK_HPP
diff --git a/ext/asio/detail/completion_handler.hpp b/ext/asio/detail/completion_handler.hpp
new file mode 100644
index 0000000000..16167dfbe2
--- /dev/null
+++ b/ext/asio/detail/completion_handler.hpp
@@ -0,0 +1,71 @@
+//
+// completion_handler.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_COMPLETION_HANDLER_HPP
+#define ASIO_DETAIL_COMPLETION_HANDLER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/operation.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Handler>
+class completion_handler : public operation
+{
+public:
+  completion_handler(Handler h)
+    : operation(&completion_handler::do_complete),
+      handler_(h)
+  {
+  }
+
+  static void do_complete(io_service_impl* owner, operation* base,
+      asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+  {
+    // Take ownership of the handler object.
+    completion_handler* h(static_cast<completion_handler*>(base));
+    typedef handler_alloc_traits<Handler, completion_handler> alloc_traits;
+    handler_ptr<alloc_traits> ptr(h->handler_, h);
+
+    // Make the upcall if required.
+    if (owner)
+    {
+      // Make a copy of the handler so that the memory can be deallocated
+      // before the upcall is made. Even if we're not about to make an
+      // upcall, a sub-object of the handler may be the true owner of the
+      // memory associated with the handler. Consequently, a local copy of
+      // the handler is required to ensure that any owning sub-object remains
+      // valid until after we have deallocated the memory here.
+      Handler handler(h->handler_);
+      ptr.reset();
+      asio::detail::fenced_block b;
+      asio_handler_invoke_helpers::invoke(handler, handler);
+    }
+  }
+
+private:
+  Handler handler_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_COMPLETION_HANDLER_HPP
diff --git a/ext/asio/detail/consuming_buffers.hpp b/ext/asio/detail/consuming_buffers.hpp
new file mode 100644
index 0000000000..80b6a8e803
--- /dev/null
+++ b/ext/asio/detail/consuming_buffers.hpp
@@ -0,0 +1,280 @@
+//
+// consuming_buffers.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_CONSUMING_BUFFERS_HPP
+#define ASIO_DETAIL_CONSUMING_BUFFERS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <algorithm>
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/iterator.hpp>
+#include <boost/limits.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffer.hpp"
+
+namespace asio {
+namespace detail {
+
+// A proxy iterator for a sub-range in a list of buffers.
+template <typename Buffer, typename Buffer_Iterator>
+class consuming_buffers_iterator
+  : public boost::iterator<std::forward_iterator_tag, const Buffer>
+{
+public:
+  // Default constructor creates an end iterator.
+  consuming_buffers_iterator()
+    : at_end_(true)
+  {
+  }
+
+  // Construct with a buffer for the first entry and an iterator
+  // range for the remaining entries.
+  consuming_buffers_iterator(bool at_end, const Buffer& first,
+      Buffer_Iterator begin_remainder, Buffer_Iterator end_remainder,
+      std::size_t max_size)
+    : at_end_(max_size > 0 ? at_end : true),
+      first_(buffer(first, max_size)),
+      begin_remainder_(begin_remainder),
+      end_remainder_(end_remainder),
+      offset_(0),
+      max_size_(max_size)
+  {
+  }
+
+  // Dereference an iterator.
+  const Buffer& operator*() const
+  {
+    return dereference();
+  }
+
+  // Dereference an iterator.
+  const Buffer* operator->() const
+  {
+    return &dereference();
+  }
+
+  // Increment operator (prefix).
+  consuming_buffers_iterator& operator++()
+  {
+    increment();
+    return *this;
+  }
+
+  // Increment operator (postfix).
+  consuming_buffers_iterator operator++(int)
+  {
+    consuming_buffers_iterator tmp(*this);
+    ++*this;
+    return tmp;
+  }
+
+  // Test two iterators for equality.
+  friend bool operator==(const consuming_buffers_iterator& a,
+      const consuming_buffers_iterator& b)
+  {
+    return a.equal(b);
+  }
+
+  // Test two iterators for inequality.
+  friend bool operator!=(const consuming_buffers_iterator& a,
+      const consuming_buffers_iterator& b)
+  {
+    return !a.equal(b);
+  }
+
+private:
+  void increment()
+  {
+    if (!at_end_)
+    {
+      if (begin_remainder_ == end_remainder_
+          || offset_ + buffer_size(first_) >= max_size_)
+      {
+        at_end_ = true;
+      }
+      else
+      {
+        offset_ += buffer_size(first_);
+        first_ = buffer(*begin_remainder_++, max_size_ - offset_);
+      }
+    }
+  }
+
+  bool equal(const consuming_buffers_iterator& other) const
+  {
+    if (at_end_ && other.at_end_)
+      return true;
+    return !at_end_ && !other.at_end_
+      && buffer_cast<const void*>(first_)
+        == buffer_cast<const void*>(other.first_)
+      && buffer_size(first_) == buffer_size(other.first_)
+      && begin_remainder_ == other.begin_remainder_
+      && end_remainder_ == other.end_remainder_;
+  }
+
+  const Buffer& dereference() const
+  {
+    return first_;
+  }
+
+  bool at_end_;
+  Buffer first_;
+  Buffer_Iterator begin_remainder_;
+  Buffer_Iterator end_remainder_;
+  std::size_t offset_;
+  std::size_t max_size_;
+};
+
+// A proxy for a sub-range in a list of buffers.
+template <typename Buffer, typename Buffers>
+class consuming_buffers
+{
+public:
+  // The type for each element in the list of buffers.
+  typedef Buffer value_type;
+
+  // A forward-only iterator type that may be used to read elements.
+  typedef consuming_buffers_iterator<Buffer, typename Buffers::const_iterator>
+    const_iterator;
+
+  // Construct to represent the entire list of buffers.
+  consuming_buffers(const Buffers& buffers)
+    : buffers_(buffers),
+      at_end_(buffers_.begin() == buffers_.end()),
+      first_(*buffers_.begin()),
+      begin_remainder_(buffers_.begin()),
+      max_size_((std::numeric_limits<std::size_t>::max)())
+  {
+    if (!at_end_)
+      ++begin_remainder_;
+  }
+
+  // Copy constructor.
+  consuming_buffers(const consuming_buffers& other)
+    : buffers_(other.buffers_),
+      at_end_(other.at_end_),
+      first_(other.first_),
+      begin_remainder_(buffers_.begin()),
+      max_size_(other.max_size_)
+  {
+    typename Buffers::const_iterator first = other.buffers_.begin();
+    typename Buffers::const_iterator second = other.begin_remainder_;
+    std::advance(begin_remainder_, std::distance(first, second));
+  }
+
+  // Assignment operator.
+  consuming_buffers& operator=(const consuming_buffers& other)
+  {
+    buffers_ = other.buffers_;
+    at_end_ = other.at_end_;
+    first_ = other.first_;
+    begin_remainder_ = buffers_.begin();
+    typename Buffers::const_iterator first = other.buffers_.begin();
+    typename Buffers::const_iterator second = other.begin_remainder_;
+    std::advance(begin_remainder_, std::distance(first, second));
+    max_size_ = other.max_size_;
+    return *this;
+  }
+
+  // Get a forward-only iterator to the first element.
+  const_iterator begin() const
+  {
+    return const_iterator(at_end_, first_,
+        begin_remainder_, buffers_.end(), max_size_);
+  }
+
+  // Get a forward-only iterator for one past the last element.
+  const_iterator end() const
+  {
+    return const_iterator();
+  }
+
+  // Set the maximum size for a single transfer.
+  void prepare(std::size_t max_size)
+  {
+    max_size_ = max_size;
+  }
+
+  // Consume the specified number of bytes from the buffers.
+  void consume(std::size_t size)
+  {
+    // Remove buffers from the start until the specified size is reached.
+    while (size > 0 && !at_end_)
+    {
+      if (buffer_size(first_) <= size)
+      {
+        size -= buffer_size(first_);
+        if (begin_remainder_ == buffers_.end())
+          at_end_ = true;
+        else
+          first_ = *begin_remainder_++;
+      }
+      else
+      {
+        first_ = first_ + size;
+        size = 0;
+      }
+    }
+
+    // Remove any more empty buffers at the start.
+    while (!at_end_ && buffer_size(first_) == 0)
+    {
+      if (begin_remainder_ == buffers_.end())
+        at_end_ = true;
+      else
+        first_ = *begin_remainder_++;
+    }
+  }
+
+private:
+  Buffers buffers_;
+  bool at_end_;
+  Buffer first_;
+  typename Buffers::const_iterator begin_remainder_;
+  std::size_t max_size_;
+};
+
+// Specialisation for null_buffers to ensure that the null_buffers type is
+// always passed through to the underlying read or write operation.
+template <typename Buffer>
+class consuming_buffers<Buffer, asio::null_buffers>
+  : public asio::null_buffers
+{
+public:
+  consuming_buffers(const asio::null_buffers&)
+  {
+    // No-op.
+  }
+
+  void prepare(std::size_t)
+  {
+    // No-op.
+  }
+
+  void consume(std::size_t)
+  {
+    // No-op.
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_CONSUMING_BUFFERS_HPP
diff --git a/ext/asio/detail/deadline_timer_service.hpp b/ext/asio/detail/deadline_timer_service.hpp
new file mode 100644
index 0000000000..6daf7acb35
--- /dev/null
+++ b/ext/asio/detail/deadline_timer_service.hpp
@@ -0,0 +1,222 @@
+//
+// deadline_timer_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
+#define ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/timer_op.hpp"
+#include "asio/detail/timer_queue.hpp"
+#include "asio/detail/timer_scheduler.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Time_Traits>
+class deadline_timer_service
+{
+public:
+  // The time type.
+  typedef typename Time_Traits::time_type time_type;
+
+  // The duration type.
+  typedef typename Time_Traits::duration_type duration_type;
+
+  // The implementation type of the timer. This type is dependent on the
+  // underlying implementation of the timer service.
+  struct implementation_type
+    : private asio::detail::noncopyable
+  {
+    time_type expiry;
+    bool might_have_pending_waits;
+  };
+
+  // Constructor.
+  deadline_timer_service(asio::io_service& io_service)
+    : scheduler_(asio::use_service<timer_scheduler>(io_service))
+  {
+    scheduler_.init_task();
+    scheduler_.add_timer_queue(timer_queue_);
+  }
+
+  // Destructor.
+  ~deadline_timer_service()
+  {
+    scheduler_.remove_timer_queue(timer_queue_);
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  // Construct a new timer implementation.
+  void construct(implementation_type& impl)
+  {
+    impl.expiry = time_type();
+    impl.might_have_pending_waits = false;
+  }
+
+  // Destroy a timer implementation.
+  void destroy(implementation_type& impl)
+  {
+    asio::error_code ec;
+    cancel(impl, ec);
+  }
+
+  // Cancel any asynchronous wait operations associated with the timer.
+  std::size_t cancel(implementation_type& impl, asio::error_code& ec)
+  {
+    if (!impl.might_have_pending_waits)
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+    std::size_t count = scheduler_.cancel_timer(timer_queue_, &impl);
+    impl.might_have_pending_waits = false;
+    ec = asio::error_code();
+    return count;
+  }
+
+  // Get the expiry time for the timer as an absolute time.
+  time_type expires_at(const implementation_type& impl) const
+  {
+    return impl.expiry;
+  }
+
+  // Set the expiry time for the timer as an absolute time.
+  std::size_t expires_at(implementation_type& impl,
+      const time_type& expiry_time, asio::error_code& ec)
+  {
+    std::size_t count = cancel(impl, ec);
+    impl.expiry = expiry_time;
+    ec = asio::error_code();
+    return count;
+  }
+
+  // Get the expiry time for the timer relative to now.
+  duration_type expires_from_now(const implementation_type& impl) const
+  {
+    return Time_Traits::subtract(expires_at(impl), Time_Traits::now());
+  }
+
+  // Set the expiry time for the timer relative to now.
+  std::size_t expires_from_now(implementation_type& impl,
+      const duration_type& expiry_time, asio::error_code& ec)
+  {
+    return expires_at(impl,
+        Time_Traits::add(Time_Traits::now(), expiry_time), ec);
+  }
+
+  // Perform a blocking wait on the timer.
+  void wait(implementation_type& impl, asio::error_code& ec)
+  {
+    time_type now = Time_Traits::now();
+    while (Time_Traits::less_than(now, impl.expiry))
+    {
+      boost::posix_time::time_duration timeout =
+        Time_Traits::to_posix_duration(Time_Traits::subtract(impl.expiry, now));
+      ::timeval tv;
+      tv.tv_sec = timeout.total_seconds();
+      tv.tv_usec = timeout.total_microseconds() % 1000000;
+      asio::error_code ec;
+      socket_ops::select(0, 0, 0, 0, &tv, ec);
+      now = Time_Traits::now();
+    }
+    ec = asio::error_code();
+  }
+
+  template <typename Handler>
+  class wait_handler : public timer_op
+  {
+  public:
+    wait_handler(Handler handler)
+      : timer_op(&wait_handler::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      wait_handler* h(static_cast<wait_handler*>(base));
+      typedef handler_alloc_traits<Handler, wait_handler> alloc_traits;
+      handler_ptr<alloc_traits> ptr(h->handler_, h);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder1<Handler, asio::error_code>
+          handler(h->handler_, h->ec_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous wait on the timer.
+  template <typename Handler>
+  void async_wait(implementation_type& impl, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef wait_handler<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    impl.might_have_pending_waits = true;
+
+    scheduler_.schedule_timer(timer_queue_, impl.expiry, ptr.get(), &impl);
+    ptr.release();
+  }
+
+private:
+  // The queue of timers.
+  timer_queue<Time_Traits> timer_queue_;
+
+  // The object that schedules and executes timers. Usually a reactor.
+  timer_scheduler& scheduler_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
diff --git a/ext/asio/detail/descriptor_ops.hpp b/ext/asio/detail/descriptor_ops.hpp
new file mode 100644
index 0000000000..ea3731e7ac
--- /dev/null
+++ b/ext/asio/detail/descriptor_ops.hpp
@@ -0,0 +1,176 @@
+//
+// descriptor_ops.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_DESCRIPTOR_OPS_HPP
+#define ASIO_DETAIL_DESCRIPTOR_OPS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <cerrno>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+namespace asio {
+namespace detail {
+namespace descriptor_ops {
+
+inline void clear_error(asio::error_code& ec)
+{
+  errno = 0;
+  ec = asio::error_code();
+}
+
+template <typename ReturnType>
+inline ReturnType error_wrapper(ReturnType return_value,
+    asio::error_code& ec)
+{
+  ec = asio::error_code(errno,
+      asio::error::get_system_category());
+  return return_value;
+}
+
+inline int open(const char* path, int flags, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::open(path, flags), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int close(int d, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::close(d), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+inline void init_buf_iov_base(void*& base, void* addr)
+{
+  base = addr;
+}
+
+template <typename T>
+inline void init_buf_iov_base(T& base, void* addr)
+{
+  base = static_cast<T>(addr);
+}
+
+typedef iovec buf;
+
+inline void init_buf(buf& b, void* data, size_t size)
+{
+  init_buf_iov_base(b.iov_base, data);
+  b.iov_len = size;
+}
+
+inline void init_buf(buf& b, const void* data, size_t size)
+{
+  init_buf_iov_base(b.iov_base, const_cast<void*>(data));
+  b.iov_len = size;
+}
+
+inline int scatter_read(int d, buf* bufs, size_t count,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::readv(d, bufs, static_cast<int>(count)), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int gather_write(int d, const buf* bufs, size_t count,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::writev(d, bufs, static_cast<int>(count)), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int ioctl(int d, long cmd, ioctl_arg_type* arg,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::ioctl(d, cmd, arg), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int fcntl(int d, long cmd, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::fcntl(d, cmd), ec);
+  if (result != -1)
+    clear_error(ec);
+  return result;
+}
+
+inline int fcntl(int d, long cmd, long arg, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::fcntl(d, cmd, arg), ec);
+  if (result != -1)
+    clear_error(ec);
+  return result;
+}
+
+inline int poll_read(int d, asio::error_code& ec)
+{
+  clear_error(ec);
+  pollfd fds;
+  fds.fd = d;
+  fds.events = POLLIN;
+  fds.revents = 0;
+  clear_error(ec);
+  int result = error_wrapper(::poll(&fds, 1, -1), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int poll_write(int d, asio::error_code& ec)
+{
+  clear_error(ec);
+  pollfd fds;
+  fds.fd = d;
+  fds.events = POLLOUT;
+  fds.revents = 0;
+  clear_error(ec);
+  int result = error_wrapper(::poll(&fds, 1, -1), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+}
+
+} // namespace descriptor_ops
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_DESCRIPTOR_OPS_HPP
diff --git a/ext/asio/detail/dev_poll_reactor.hpp b/ext/asio/detail/dev_poll_reactor.hpp
new file mode 100644
index 0000000000..1367b7190f
--- /dev/null
+++ b/ext/asio/detail/dev_poll_reactor.hpp
@@ -0,0 +1,453 @@
+//
+// dev_poll_reactor.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_DEV_POLL_REACTOR_HPP
+#define ASIO_DETAIL_DEV_POLL_REACTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/dev_poll_reactor_fwd.hpp"
+
+#if defined(ASIO_HAS_DEV_POLL)
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <vector>
+#include <boost/config.hpp>
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+#include <boost/throw_exception.hpp>
+#include <sys/devpoll.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/hash_map.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/reactor_op.hpp"
+#include "asio/detail/reactor_op_queue.hpp"
+#include "asio/detail/select_interrupter.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/timer_op.hpp"
+#include "asio/detail/timer_queue_base.hpp"
+#include "asio/detail/timer_queue_fwd.hpp"
+#include "asio/detail/timer_queue_set.hpp"
+
+namespace asio {
+namespace detail {
+
+class dev_poll_reactor
+  : public asio::detail::service_base<dev_poll_reactor>
+{
+public:
+  enum { read_op = 0, write_op = 1,
+    connect_op = 1, except_op = 2, max_ops = 3 };
+
+  // Per-descriptor data.
+  struct per_descriptor_data
+  {
+  };
+
+  // Constructor.
+  dev_poll_reactor(asio::io_service& io_service)
+    : asio::detail::service_base<dev_poll_reactor>(io_service),
+      io_service_(use_service<io_service_impl>(io_service)),
+      mutex_(),
+      dev_poll_fd_(do_dev_poll_create()),
+      interrupter_(),
+      shutdown_(false)
+  {
+    // Add the interrupter's descriptor to /dev/poll.
+    ::pollfd ev = { 0 };
+    ev.fd = interrupter_.read_descriptor();
+    ev.events = POLLIN | POLLERR;
+    ev.revents = 0;
+    ::write(dev_poll_fd_, &ev, sizeof(ev));
+  }
+
+  // Destructor.
+  ~dev_poll_reactor()
+  {
+    shutdown_service();
+    ::close(dev_poll_fd_);
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    shutdown_ = true;
+    lock.unlock();
+
+    op_queue<operation> ops;
+
+    for (int i = 0; i < max_ops; ++i)
+      op_queue_[i].get_all_operations(ops);
+
+    timer_queues_.get_all_timers(ops);
+  } 
+
+  // Initialise the task.
+  void init_task()
+  {
+    io_service_.init_task();
+  }
+
+  // Register a socket with the reactor. Returns 0 on success, system error
+  // code on failure.
+  int register_descriptor(socket_type, per_descriptor_data&)
+  {
+    return 0;
+  }
+
+  // Start a new operation. The reactor operation will be performed when the
+  // given descriptor is flagged as ready, or an error has occurred.
+  void start_op(int op_type, socket_type descriptor,
+      per_descriptor_data&, reactor_op* op, bool allow_speculative)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    if (shutdown_)
+      return;
+
+    if (allow_speculative)
+    {
+      if (op_type != read_op || !op_queue_[except_op].has_operation(descriptor))
+      {
+        if (!op_queue_[op_type].has_operation(descriptor))
+        {
+          if (op->perform())
+          {
+            lock.unlock();
+            io_service_.post_immediate_completion(op);
+            return;
+          }
+        }
+      }
+    }
+
+    bool first = op_queue_[op_type].enqueue_operation(descriptor, op);
+    io_service_.work_started();
+    if (first)
+    {
+      ::pollfd& ev = add_pending_event_change(descriptor);
+      ev.events = POLLERR | POLLHUP;
+      if (op_type == read_op
+          || op_queue_[read_op].has_operation(descriptor))
+        ev.events |= POLLIN;
+      if (op_type == write_op
+          || op_queue_[write_op].has_operation(descriptor))
+        ev.events |= POLLOUT;
+      if (op_type == except_op
+          || op_queue_[except_op].has_operation(descriptor))
+        ev.events |= POLLPRI;
+      interrupter_.interrupt();
+    }
+  }
+
+  // Cancel all operations associated with the given descriptor. The
+  // handlers associated with the descriptor will be invoked with the
+  // operation_aborted error.
+  void cancel_ops(socket_type descriptor, per_descriptor_data&)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    cancel_ops_unlocked(descriptor, asio::error::operation_aborted);
+  }
+
+  // Cancel any operations that are running against the descriptor and remove
+  // its registration from the reactor.
+  void close_descriptor(socket_type descriptor, per_descriptor_data&)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    // Remove the descriptor from /dev/poll.
+    ::pollfd& ev = add_pending_event_change(descriptor);
+    ev.events = POLLREMOVE;
+    interrupter_.interrupt();
+
+    // Cancel any outstanding operations associated with the descriptor.
+    cancel_ops_unlocked(descriptor, asio::error::operation_aborted);
+  }
+
+  // Add a new timer queue to the reactor.
+  template <typename Time_Traits>
+  void add_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    timer_queues_.insert(&timer_queue);
+  }
+
+  // Remove a timer queue from the reactor.
+  template <typename Time_Traits>
+  void remove_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    timer_queues_.erase(&timer_queue);
+  }
+
+  // Schedule a new operation in the given timer queue to expire at the
+  // specified absolute time.
+  template <typename Time_Traits>
+  void schedule_timer(timer_queue<Time_Traits>& timer_queue,
+      const typename Time_Traits::time_type& time, timer_op* op, void* token)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    if (!shutdown_)
+    {
+      bool earliest = timer_queue.enqueue_timer(time, op, token);
+      io_service_.work_started();
+      if (earliest)
+        interrupter_.interrupt();
+    }
+  }
+
+  // Cancel the timer operations associated with the given token. Returns the
+  // number of operations that have been posted or dispatched.
+  template <typename Time_Traits>
+  std::size_t cancel_timer(timer_queue<Time_Traits>& timer_queue, void* token)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    op_queue<operation> ops;
+    std::size_t n = timer_queue.cancel_timer(token, ops);
+    lock.unlock();
+    io_service_.post_deferred_completions(ops);
+    return n;
+  }
+
+  // Run /dev/poll once until interrupted or events are ready to be dispatched.
+  void run(bool block, op_queue<operation>& ops)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    // We can return immediately if there's no work to do and the reactor is
+    // not supposed to block.
+    if (!block && op_queue_[read_op].empty() && op_queue_[write_op].empty()
+        && op_queue_[except_op].empty() && timer_queues_.all_empty())
+      return;
+
+    // Write the pending event registration changes to the /dev/poll descriptor.
+    std::size_t events_size = sizeof(::pollfd) * pending_event_changes_.size();
+    if (events_size > 0)
+    {
+      errno = 0;
+      int result = ::write(dev_poll_fd_,
+          &pending_event_changes_[0], events_size);
+      if (result != static_cast<int>(events_size))
+      {
+        asio::error_code ec = asio::error_code(
+            errno, asio::error::get_system_category());
+        for (std::size_t i = 0; i < pending_event_changes_.size(); ++i)
+        {
+          int descriptor = pending_event_changes_[i].fd;
+          for (int j = 0; j < max_ops; ++j)
+            op_queue_[j].cancel_operations(descriptor, ops, ec);
+        }
+      }
+      pending_event_changes_.clear();
+      pending_event_change_index_.clear();
+    }
+
+    int timeout = block ? get_timeout() : 0;
+    lock.unlock();
+
+    // Block on the /dev/poll descriptor.
+    ::pollfd events[128] = { { 0 } };
+    ::dvpoll dp = { 0 };
+    dp.dp_fds = events;
+    dp.dp_nfds = 128;
+    dp.dp_timeout = timeout;
+    int num_events = ::ioctl(dev_poll_fd_, DP_POLL, &dp);
+
+    lock.lock();
+
+    // Dispatch the waiting events.
+    for (int i = 0; i < num_events; ++i)
+    {
+      int descriptor = events[i].fd;
+      if (descriptor == interrupter_.read_descriptor())
+      {
+        interrupter_.reset();
+      }
+      else
+      {
+        bool more_reads = false;
+        bool more_writes = false;
+        bool more_except = false;
+
+        // Exception operations must be processed first to ensure that any
+        // out-of-band data is read before normal data.
+        if (events[i].events & (POLLPRI | POLLERR | POLLHUP))
+          more_except =
+            op_queue_[except_op].perform_operations(descriptor, ops);
+        else
+          more_except = op_queue_[except_op].has_operation(descriptor);
+
+        if (events[i].events & (POLLIN | POLLERR | POLLHUP))
+          more_reads = op_queue_[read_op].perform_operations(descriptor, ops);
+        else
+          more_reads = op_queue_[read_op].has_operation(descriptor);
+
+        if (events[i].events & (POLLOUT | POLLERR | POLLHUP))
+          more_writes = op_queue_[write_op].perform_operations(descriptor, ops);
+        else
+          more_writes = op_queue_[write_op].has_operation(descriptor);
+
+        if ((events[i].events & (POLLERR | POLLHUP)) != 0
+              && !more_except && !more_reads && !more_writes)
+        {
+          // If we have an event and no operations associated with the
+          // descriptor then we need to delete the descriptor from /dev/poll.
+          // The poll operation can produce POLLHUP or POLLERR events when there
+          // is no operation pending, so if we do not remove the descriptor we
+          // can end up in a tight polling loop.
+          ::pollfd ev = { 0 };
+          ev.fd = descriptor;
+          ev.events = POLLREMOVE;
+          ev.revents = 0;
+          ::write(dev_poll_fd_, &ev, sizeof(ev));
+        }
+        else
+        {
+          ::pollfd ev = { 0 };
+          ev.fd = descriptor;
+          ev.events = POLLERR | POLLHUP;
+          if (more_reads)
+            ev.events |= POLLIN;
+          if (more_writes)
+            ev.events |= POLLOUT;
+          if (more_except)
+            ev.events |= POLLPRI;
+          ev.revents = 0;
+          int result = ::write(dev_poll_fd_, &ev, sizeof(ev));
+          if (result != sizeof(ev))
+          {
+            asio::error_code ec(errno,
+                asio::error::get_system_category());
+            for (int j = 0; j < max_ops; ++j)
+              op_queue_[j].cancel_operations(descriptor, ops, ec);
+          }
+        }
+      }
+    }
+    timer_queues_.get_ready_timers(ops);
+  }
+
+  // Interrupt the select loop.
+  void interrupt()
+  {
+    interrupter_.interrupt();
+  }
+
+private:
+  // Create the /dev/poll file descriptor. Throws an exception if the descriptor
+  // cannot be created.
+  static int do_dev_poll_create()
+  {
+    int fd = ::open("/dev/poll", O_RDWR);
+    if (fd == -1)
+    {
+      boost::throw_exception(
+          asio::system_error(
+            asio::error_code(errno,
+              asio::error::get_system_category()),
+            "/dev/poll"));
+    }
+    return fd;
+  }
+
+  // Get the timeout value for the /dev/poll DP_POLL operation. The timeout
+  // value is returned as a number of milliseconds. A return value of -1
+  // indicates that the poll should block indefinitely.
+  int get_timeout()
+  {
+    // By default we will wait no longer than 5 minutes. This will ensure that
+    // any changes to the system clock are detected after no longer than this.
+    return timer_queues_.wait_duration_msec(5 * 60 * 1000);
+  }
+
+  // Cancel all operations associated with the given descriptor. The do_cancel
+  // function of the handler objects will be invoked. This function does not
+  // acquire the dev_poll_reactor's mutex.
+  void cancel_ops_unlocked(socket_type descriptor,
+      const asio::error_code& ec)
+  {
+    bool need_interrupt = false;
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+      need_interrupt = op_queue_[i].cancel_operations(
+          descriptor, ops, ec) || need_interrupt;
+    io_service_.post_deferred_completions(ops);
+    if (need_interrupt)
+      interrupter_.interrupt();
+  }
+
+  // Add a pending event entry for the given descriptor.
+  ::pollfd& add_pending_event_change(int descriptor)
+  {
+    hash_map<int, std::size_t>::iterator iter
+      = pending_event_change_index_.find(descriptor);
+    if (iter == pending_event_change_index_.end())
+    {
+      std::size_t index = pending_event_changes_.size();
+      pending_event_changes_.reserve(pending_event_changes_.size() + 1);
+      pending_event_change_index_.insert(std::make_pair(descriptor, index));
+      pending_event_changes_.push_back(::pollfd());
+      pending_event_changes_[index].fd = descriptor;
+      pending_event_changes_[index].revents = 0;
+      return pending_event_changes_[index];
+    }
+    else
+    {
+      return pending_event_changes_[iter->second];
+    }
+  }
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_;
+
+  // Mutex to protect access to internal data.
+  asio::detail::mutex mutex_;
+
+  // The /dev/poll file descriptor.
+  int dev_poll_fd_;
+
+  // Vector of /dev/poll events waiting to be written to the descriptor.
+  std::vector< ::pollfd> pending_event_changes_;
+
+  // Hash map to associate a descriptor with a pending event change index.
+  hash_map<int, std::size_t> pending_event_change_index_;
+
+  // The interrupter is used to break a blocking DP_POLL operation.
+  select_interrupter interrupter_;
+
+  // The queues of read, write and except operations.
+  reactor_op_queue<socket_type> op_queue_[max_ops];
+
+  // The timer queues.
+  timer_queue_set timer_queues_;
+
+  // Whether the service has been shut down.
+  bool shutdown_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_DEV_POLL)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_DEV_POLL_REACTOR_HPP
diff --git a/ext/asio/detail/dev_poll_reactor_fwd.hpp b/ext/asio/detail/dev_poll_reactor_fwd.hpp
new file mode 100644
index 0000000000..f7f1aebab4
--- /dev/null
+++ b/ext/asio/detail/dev_poll_reactor_fwd.hpp
@@ -0,0 +1,39 @@
+//
+// dev_poll_reactor_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_DEV_POLL_REACTOR_FWD_HPP
+#define ASIO_DETAIL_DEV_POLL_REACTOR_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#if !defined(ASIO_DISABLE_DEV_POLL)
+#if defined(__sun) // This service is only supported on Solaris.
+
+// Define this to indicate that /dev/poll is supported on the target platform.
+#define ASIO_HAS_DEV_POLL 1
+
+namespace asio {
+namespace detail {
+
+class dev_poll_reactor;
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(__sun)
+#endif // !defined(ASIO_DISABLE_DEV_POLL)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_DEV_POLL_REACTOR_FWD_HPP
diff --git a/ext/asio/detail/epoll_reactor.hpp b/ext/asio/detail/epoll_reactor.hpp
new file mode 100644
index 0000000000..20ef576198
--- /dev/null
+++ b/ext/asio/detail/epoll_reactor.hpp
@@ -0,0 +1,507 @@
+//
+// epoll_reactor.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_EPOLL_REACTOR_HPP
+#define ASIO_DETAIL_EPOLL_REACTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/epoll_reactor_fwd.hpp"
+
+#if defined(ASIO_HAS_EPOLL)
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <sys/epoll.h>
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/hash_map.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/reactor_op.hpp"
+#include "asio/detail/select_interrupter.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/timer_op.hpp"
+#include "asio/detail/timer_queue_base.hpp"
+#include "asio/detail/timer_queue_fwd.hpp"
+#include "asio/detail/timer_queue_set.hpp"
+
+#if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8)
+# define ASIO_HAS_TIMERFD 1
+#endif // (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8)
+
+#if defined(ASIO_HAS_TIMERFD)
+# include "asio/detail/push_options.hpp"
+# include <sys/timerfd.h>
+# include "asio/detail/pop_options.hpp"
+#endif // defined(ASIO_HAS_TIMERFD)
+
+namespace asio {
+namespace detail {
+
+class epoll_reactor
+  : public asio::detail::service_base<epoll_reactor>
+{
+public:
+  enum { read_op = 0, write_op = 1,
+    connect_op = 1, except_op = 2, max_ops = 3 };
+
+  // Per-descriptor queues.
+  struct descriptor_state
+  {
+    descriptor_state() {}
+    descriptor_state(const descriptor_state&) {}
+    void operator=(const descriptor_state&) {}
+
+    mutex mutex_;
+    op_queue<reactor_op> op_queue_[max_ops];
+    bool shutdown_;
+  };
+
+  // Per-descriptor data.
+  typedef descriptor_state* per_descriptor_data;
+
+  // Constructor.
+  epoll_reactor(asio::io_service& io_service)
+    : asio::detail::service_base<epoll_reactor>(io_service),
+      io_service_(use_service<io_service_impl>(io_service)),
+      mutex_(),
+      epoll_fd_(do_epoll_create()),
+#if defined(ASIO_HAS_TIMERFD)
+      timer_fd_(timerfd_create(CLOCK_MONOTONIC, 0)),
+#else // defined(ASIO_HAS_TIMERFD)
+      timer_fd_(-1),
+#endif // defined(ASIO_HAS_TIMERFD)
+      interrupter_(),
+      shutdown_(false)
+  {
+    // Add the interrupter's descriptor to epoll.
+    epoll_event ev = { 0, { 0 } };
+    ev.events = EPOLLIN | EPOLLERR | EPOLLET;
+    ev.data.ptr = &interrupter_;
+    epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, interrupter_.read_descriptor(), &ev);
+    interrupter_.interrupt();
+
+    // Add the timer descriptor to epoll.
+    if (timer_fd_ != -1)
+    {
+      ev.events = EPOLLIN | EPOLLERR;
+      ev.data.ptr = &timer_fd_;
+      epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &ev);
+    }
+  }
+
+  // Destructor.
+  ~epoll_reactor()
+  {
+    close(epoll_fd_);
+    if (timer_fd_ != -1)
+      close(timer_fd_);
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    mutex::scoped_lock lock(mutex_);
+    shutdown_ = true;
+    lock.unlock();
+
+    op_queue<operation> ops;
+
+    descriptor_map::iterator iter = registered_descriptors_.begin();
+    descriptor_map::iterator end = registered_descriptors_.end();
+    while (iter != end)
+    {
+      for (int i = 0; i < max_ops; ++i)
+        ops.push(iter->second.op_queue_[i]);
+      iter->second.shutdown_ = true;
+      ++iter;
+    }
+
+    timer_queues_.get_all_timers(ops);
+  }
+
+  // Initialise the task.
+  void init_task()
+  {
+    io_service_.init_task();
+  }
+
+  // Register a socket with the reactor. Returns 0 on success, system error
+  // code on failure.
+  int register_descriptor(socket_type descriptor,
+      per_descriptor_data& descriptor_data)
+  {
+    mutex::scoped_lock lock(registered_descriptors_mutex_);
+
+    descriptor_map::iterator new_entry = registered_descriptors_.insert(
+          std::make_pair(descriptor, descriptor_state())).first;
+    descriptor_data = &new_entry->second;
+
+    epoll_event ev = { 0, { 0 } };
+    ev.events = EPOLLIN | EPOLLERR | EPOLLHUP | EPOLLOUT | EPOLLPRI | EPOLLET;
+    ev.data.ptr = descriptor_data;
+    int result = epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, descriptor, &ev);
+    if (result != 0)
+      return errno;
+
+    descriptor_data->shutdown_ = false;
+
+    return 0;
+  }
+
+  // Start a new operation. The reactor operation will be performed when the
+  // given descriptor is flagged as ready, or an error has occurred.
+  void start_op(int op_type, socket_type descriptor,
+      per_descriptor_data& descriptor_data,
+      reactor_op* op, bool allow_speculative)
+  {
+    mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+    if (descriptor_data->shutdown_)
+      return;
+
+    if (descriptor_data->op_queue_[op_type].empty())
+    {
+      if (allow_speculative
+          && (op_type != read_op
+            || descriptor_data->op_queue_[except_op].empty()))
+      {
+        if (op->perform())
+        {
+          descriptor_lock.unlock();
+          io_service_.post_immediate_completion(op);
+          return;
+        }
+      }
+      else
+      {
+        epoll_event ev = { 0, { 0 } };
+        ev.events = EPOLLIN | EPOLLERR | EPOLLHUP
+          | EPOLLOUT | EPOLLPRI | EPOLLET;
+        ev.data.ptr = descriptor_data;
+        epoll_ctl(epoll_fd_, EPOLL_CTL_MOD, descriptor, &ev);
+      }
+    }
+
+    descriptor_data->op_queue_[op_type].push(op);
+    io_service_.work_started();
+  }
+
+  // Cancel all operations associated with the given descriptor. The
+  // handlers associated with the descriptor will be invoked with the
+  // operation_aborted error.
+  void cancel_ops(socket_type descriptor UNUSED_PARAM, per_descriptor_data& descriptor_data)
+  {
+    mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+    {
+      while (reactor_op* op = descriptor_data->op_queue_[i].front())
+      {
+        op->ec_ = asio::error::operation_aborted;
+        descriptor_data->op_queue_[i].pop();
+        ops.push(op);
+      }
+    }
+
+    descriptor_lock.unlock();
+
+    io_service_.post_deferred_completions(ops);
+  }
+
+  // Cancel any operations that are running against the descriptor and remove
+  // its registration from the reactor.
+  void close_descriptor(socket_type descriptor,
+      per_descriptor_data& descriptor_data)
+  {
+    mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+    mutex::scoped_lock descriptors_lock(registered_descriptors_mutex_);
+
+    // Remove the descriptor from the set of known descriptors. The descriptor
+    // will be automatically removed from the epoll set when it is closed.
+    descriptor_data->shutdown_ = true;
+
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+    {
+      while (reactor_op* op = descriptor_data->op_queue_[i].front())
+      {
+        op->ec_ = asio::error::operation_aborted;
+        descriptor_data->op_queue_[i].pop();
+        ops.push(op);
+      }
+    }
+
+    descriptor_lock.unlock();
+
+    registered_descriptors_.erase(descriptor);
+
+    descriptors_lock.unlock();
+
+    io_service_.post_deferred_completions(ops);
+  }
+
+  // Add a new timer queue to the reactor.
+  template <typename Time_Traits>
+  void add_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    mutex::scoped_lock lock(mutex_);
+    timer_queues_.insert(&timer_queue);
+  }
+
+  // Remove a timer queue from the reactor.
+  template <typename Time_Traits>
+  void remove_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    mutex::scoped_lock lock(mutex_);
+    timer_queues_.erase(&timer_queue);
+  }
+
+  // Schedule a new operation in the given timer queue to expire at the
+  // specified absolute time.
+  template <typename Time_Traits>
+  void schedule_timer(timer_queue<Time_Traits>& timer_queue,
+      const typename Time_Traits::time_type& time, timer_op* op, void* token)
+  {
+    mutex::scoped_lock lock(mutex_);
+    if (!shutdown_)
+    {
+      bool earliest = timer_queue.enqueue_timer(time, op, token);
+      io_service_.work_started();
+      if (earliest)
+      {
+#if defined(ASIO_HAS_TIMERFD)
+        if (timer_fd_ != -1)
+        {
+          itimerspec new_timeout;
+          itimerspec old_timeout;
+          int flags = get_timeout(new_timeout);
+          timerfd_settime(timer_fd_, flags, &new_timeout, &old_timeout);
+          return;
+        }
+#endif // defined(ASIO_HAS_TIMERFD)
+        interrupter_.interrupt();
+      }
+    }
+  }
+
+  // Cancel the timer operations associated with the given token. Returns the
+  // number of operations that have been posted or dispatched.
+  template <typename Time_Traits>
+  std::size_t cancel_timer(timer_queue<Time_Traits>& timer_queue, void* token)
+  {
+    mutex::scoped_lock lock(mutex_);
+    op_queue<operation> ops;
+    std::size_t n = timer_queue.cancel_timer(token, ops);
+    lock.unlock();
+    io_service_.post_deferred_completions(ops);
+    return n;
+  }
+
+  // Run epoll once until interrupted or events are ready to be dispatched.
+  void run(bool block, op_queue<operation>& ops)
+  {
+    // Calculate a timeout only if timerfd is not used.
+    int timeout;
+    if (timer_fd_ != -1)
+      timeout = block ? -1 : 0;
+    else
+    {
+      mutex::scoped_lock lock(mutex_);
+      timeout = block ? get_timeout() : 0;
+    }
+
+    // Block on the epoll descriptor.
+    epoll_event events[128];
+    int num_events = epoll_wait(epoll_fd_, events, 128, timeout);
+
+#if defined(ASIO_HAS_TIMERFD)
+    bool check_timers = (timer_fd_ == -1);
+#else // defined(ASIO_HAS_TIMERFD)
+    bool check_timers = true;
+#endif // defined(ASIO_HAS_TIMERFD)
+
+    // Dispatch the waiting events.
+    for (int i = 0; i < num_events; ++i)
+    {
+      void* ptr = events[i].data.ptr;
+      if (ptr == &interrupter_)
+      {
+        // No need to reset the interrupter since we're leaving the descriptor
+        // in a ready-to-read state and relying on edge-triggered notifications
+        // to make it so that we only get woken up when the descriptor's epoll
+        // registration is updated.
+
+#if defined(ASIO_HAS_TIMERFD)
+        if (timer_fd_ == -1)
+          check_timers = true;
+#else // defined(ASIO_HAS_TIMERFD)
+        check_timers = true;
+#endif // defined(ASIO_HAS_TIMERFD)
+      }
+#if defined(ASIO_HAS_TIMERFD)
+      else if (ptr == &timer_fd_)
+      {
+        check_timers = true;
+      }
+#endif // defined(ASIO_HAS_TIMERFD)
+      else
+      {
+        descriptor_state* descriptor_data = static_cast<descriptor_state*>(ptr);
+        mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+        // Exception operations must be processed first to ensure that any
+        // out-of-band data is read before normal data.
+        static const int flag[max_ops] = { EPOLLIN, EPOLLOUT, EPOLLPRI };
+        for (int j = max_ops - 1; j >= 0; --j)
+        {
+          if (events[i].events & (flag[j] | EPOLLERR | EPOLLHUP))
+          {
+            while (reactor_op* op = descriptor_data->op_queue_[j].front())
+            {
+              if (op->perform())
+              {
+                descriptor_data->op_queue_[j].pop();
+                ops.push(op);
+              }
+              else
+                break;
+            }
+          }
+        }
+      }
+    }
+
+    if (check_timers)
+    {
+      mutex::scoped_lock common_lock(mutex_);
+      timer_queues_.get_ready_timers(ops);
+
+#if defined(ASIO_HAS_TIMERFD)
+      if (timer_fd_ != -1)
+      {
+        itimerspec new_timeout;
+        itimerspec old_timeout;
+        int flags = get_timeout(new_timeout);
+        timerfd_settime(timer_fd_, flags, &new_timeout, &old_timeout);
+      }
+#endif // defined(ASIO_HAS_TIMERFD)
+    }
+  }
+
+  // Interrupt the select loop.
+  void interrupt()
+  {
+    epoll_event ev = { 0, { 0 } };
+    ev.events = EPOLLIN | EPOLLERR | EPOLLET;
+    ev.data.ptr = &interrupter_;
+    epoll_ctl(epoll_fd_, EPOLL_CTL_MOD, interrupter_.read_descriptor(), &ev);
+  }
+
+private:
+  // The hint to pass to epoll_create to size its data structures.
+  enum { epoll_size = 20000 };
+
+  // Create the epoll file descriptor. Throws an exception if the descriptor
+  // cannot be created.
+  static int do_epoll_create()
+  {
+    int fd = epoll_create(epoll_size);
+    if (fd == -1)
+    {
+      boost::throw_exception(
+          asio::system_error(
+            asio::error_code(errno,
+              asio::error::get_system_category()),
+            "epoll"));
+    }
+    return fd;
+  }
+
+  // Get the timeout value for the epoll_wait call. The timeout value is
+  // returned as a number of milliseconds. A return value of -1 indicates
+  // that epoll_wait should block indefinitely.
+  int get_timeout()
+  {
+    // By default we will wait no longer than 5 minutes. This will ensure that
+    // any changes to the system clock are detected after no longer than this.
+    return timer_queues_.wait_duration_msec(5 * 60 * 1000);
+  }
+
+#if defined(ASIO_HAS_TIMERFD)
+  // Get the timeout value for the timer descriptor. The return value is the
+  // flag argument to be used when calling timerfd_settime.
+  int get_timeout(itimerspec& ts)
+  {
+    ts.it_interval.tv_sec = 0;
+    ts.it_interval.tv_nsec = 0;
+
+    long usec = timer_queues_.wait_duration_usec(5 * 60 * 1000 * 1000);
+    ts.it_value.tv_sec = usec / 1000000;
+    ts.it_value.tv_nsec = usec ? (usec % 1000000) * 1000 : 1;
+
+    return usec ? 0 : TFD_TIMER_ABSTIME;
+  }
+#endif // defined(ASIO_HAS_TIMERFD)
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_;
+
+  // Mutex to protect access to internal data.
+  mutex mutex_;
+
+  // The epoll file descriptor.
+  int epoll_fd_;
+
+  // The timer file descriptor.
+  int timer_fd_;
+
+  // The interrupter is used to break a blocking epoll_wait call.
+  select_interrupter interrupter_;
+
+  // The timer queues.
+  timer_queue_set timer_queues_;
+
+  // Whether the service has been shut down.
+  bool shutdown_;
+
+  // Mutex to protect access to the registered descriptors.
+  mutex registered_descriptors_mutex_;
+
+  // Keep track of all registered descriptors. This code relies on the fact that
+  // the hash_map implementation pools deleted nodes, meaning that we can assume
+  // our descriptor_state pointer remains valid even after the entry is removed.
+  // Technically this is not true for C++98, as that standard says that spliced
+  // elements in a list are invalidated. However, C++0x fixes this shortcoming
+  // so we'll just assume that C++98 std::list implementations will do the right
+  // thing anyway.
+  typedef detail::hash_map<socket_type, descriptor_state> descriptor_map;
+  descriptor_map registered_descriptors_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_EPOLL)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_EPOLL_REACTOR_HPP
diff --git a/ext/asio/detail/epoll_reactor_fwd.hpp b/ext/asio/detail/epoll_reactor_fwd.hpp
new file mode 100644
index 0000000000..266bccdab0
--- /dev/null
+++ b/ext/asio/detail/epoll_reactor_fwd.hpp
@@ -0,0 +1,46 @@
+//
+// epoll_reactor_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_EPOLL_REACTOR_FWD_HPP
+#define ASIO_DETAIL_EPOLL_REACTOR_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#if !defined(ASIO_DISABLE_EPOLL)
+#if defined(__linux__) // This service is only supported on Linux.
+
+#include "asio/detail/push_options.hpp"
+#include <linux/version.h>
+#include "asio/detail/pop_options.hpp"
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION (2,5,45) // Only kernels >= 2.5.45.
+
+// Define this to indicate that epoll is supported on the target platform.
+#define ASIO_HAS_EPOLL 1
+
+namespace asio {
+namespace detail {
+
+class epoll_reactor;
+
+} // namespace detail
+} // namespace asio
+
+#endif // LINUX_VERSION_CODE >= KERNEL_VERSION (2,5,45)
+#endif // defined(__linux__)
+#endif // !defined(ASIO_DISABLE_EPOLL)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_EPOLL_REACTOR_FWD_HPP
diff --git a/ext/asio/detail/event.hpp b/ext/asio/detail/event.hpp
new file mode 100644
index 0000000000..65aa4cba7f
--- /dev/null
+++ b/ext/asio/detail/event.hpp
@@ -0,0 +1,50 @@
+//
+// event.hpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_EVENT_HPP
+#define ASIO_DETAIL_EVENT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+# include "asio/detail/null_event.hpp"
+#elif defined(BOOST_WINDOWS)
+# include "asio/detail/win_event.hpp"
+#elif defined(BOOST_HAS_PTHREADS)
+# include "asio/detail/posix_event.hpp"
+#else
+# error Only Windows and POSIX are supported!
+#endif
+
+namespace asio {
+namespace detail {
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+typedef null_event event;
+#elif defined(BOOST_WINDOWS)
+typedef win_event event;
+#elif defined(BOOST_HAS_PTHREADS)
+typedef posix_event event;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_EVENT_HPP
diff --git a/ext/asio/detail/eventfd_select_interrupter.hpp b/ext/asio/detail/eventfd_select_interrupter.hpp
new file mode 100644
index 0000000000..63b7ac4ff5
--- /dev/null
+++ b/ext/asio/detail/eventfd_select_interrupter.hpp
@@ -0,0 +1,166 @@
+//
+// eventfd_select_interrupter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Roelof Naude (roelof.naude at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP
+#define ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(__linux__)
+# if !defined(ASIO_DISABLE_EVENTFD)
+#  include <linux/version.h>
+#  if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+#   define ASIO_HAS_EVENTFD
+#  endif // LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+# endif // !defined(ASIO_DISABLE_EVENTFD)
+#endif // defined(__linux__)
+
+#if defined(ASIO_HAS_EVENTFD)
+
+#include "asio/detail/push_options.hpp"
+#include <fcntl.h>
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+# include <asm/unistd.h>
+#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+# include <sys/eventfd.h>
+#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+class eventfd_select_interrupter
+{
+public:
+  // Constructor.
+  eventfd_select_interrupter()
+  {
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+    write_descriptor_ = read_descriptor_ = syscall(__NR_eventfd, 0);
+#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+    write_descriptor_ = read_descriptor_ = ::eventfd(0, 0);
+#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+    if (read_descriptor_ != -1)
+    {
+      ::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
+    }
+    else
+    {
+      int pipe_fds[2];
+      if (pipe(pipe_fds) == 0)
+      {
+        read_descriptor_ = pipe_fds[0];
+        ::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
+        write_descriptor_ = pipe_fds[1];
+        ::fcntl(write_descriptor_, F_SETFL, O_NONBLOCK);
+      }
+      else
+      {
+        asio::error_code ec(errno,
+            asio::error::get_system_category());
+        asio::system_error e(ec, "eventfd_select_interrupter");
+        boost::throw_exception(e);
+      }
+    }
+  }
+
+  // Destructor.
+  ~eventfd_select_interrupter()
+  {
+    if (write_descriptor_ != -1 && write_descriptor_ != read_descriptor_)
+      ::close(write_descriptor_);
+    if (read_descriptor_ != -1)
+      ::close(read_descriptor_);
+  }
+
+  // Interrupt the select call.
+  void interrupt()
+  {
+    uint64_t counter(1UL);
+    int result = ::write(write_descriptor_, &counter, sizeof(uint64_t));
+    (void)result;
+  }
+
+  // Reset the select interrupt. Returns true if the call was interrupted.
+  bool reset()
+  {
+    if (write_descriptor_ == read_descriptor_)
+    {
+      for (;;)
+      {
+        // Only perform one read. The kernel maintains an atomic counter.
+        uint64_t counter(0);
+        errno = 0;
+        int bytes_read = ::read(read_descriptor_, &counter, sizeof(uint64_t));
+        if (bytes_read < 0 && errno == EINTR)
+          continue;
+        bool was_interrupted = (bytes_read > 0);
+        return was_interrupted;
+      }
+    }
+    else
+    {
+      for (;;)
+      {
+        // Clear all data from the pipe.
+        char data[1024];
+        int bytes_read = ::read(read_descriptor_, data, sizeof(data));
+        if (bytes_read < 0 && errno == EINTR)
+          continue;
+        bool was_interrupted = (bytes_read > 0);
+        while (bytes_read == sizeof(data))
+          bytes_read = ::read(read_descriptor_, data, sizeof(data));
+        return was_interrupted;
+      }
+    }
+  }
+
+  // Get the read descriptor to be passed to select.
+  int read_descriptor() const
+  {
+    return read_descriptor_;
+  }
+
+private:
+  // The read end of a connection used to interrupt the select call. This file
+  // descriptor is passed to select such that when it is time to stop, a single
+  // 64bit value will be written on the other end of the connection and this
+  // descriptor will become readable.
+  int read_descriptor_;
+
+  // The write end of a connection used to interrupt the select call. A single
+  // 64bit non-zero value may be written to this to wake up the select which is
+  // waiting for the other end to become readable. This descriptor will only
+  // differ from the read descriptor when a pipe is used.
+  int write_descriptor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_EVENTFD)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP
diff --git a/ext/asio/detail/fd_set_adapter.hpp b/ext/asio/detail/fd_set_adapter.hpp
new file mode 100644
index 0000000000..a575491bfb
--- /dev/null
+++ b/ext/asio/detail/fd_set_adapter.hpp
@@ -0,0 +1,41 @@
+//
+// fd_set_adapter.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_FD_SET_ADAPTER_HPP
+#define ASIO_DETAIL_FD_SET_ADAPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/posix_fd_set_adapter.hpp"
+#include "asio/detail/win_fd_set_adapter.hpp"
+
+namespace asio {
+namespace detail {
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+typedef win_fd_set_adapter fd_set_adapter;
+#else
+typedef posix_fd_set_adapter fd_set_adapter;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_FD_SET_ADAPTER_HPP
diff --git a/ext/asio/detail/fenced_block.hpp b/ext/asio/detail/fenced_block.hpp
new file mode 100644
index 0000000000..60198bc65b
--- /dev/null
+++ b/ext/asio/detail/fenced_block.hpp
@@ -0,0 +1,70 @@
+//
+// fenced_block.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+# include "asio/detail/null_fenced_block.hpp"
+#elif defined(__MACH__) && defined(__APPLE__)
+# include "asio/detail/macos_fenced_block.hpp"
+#elif defined(__sun)
+# include "asio/detail/solaris_fenced_block.hpp"
+#elif defined(__GNUC__) \
+  && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)) \
+  && !defined(__INTEL_COMPILER) && !defined(__ICL) \
+  && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
+# include "asio/detail/gcc_fenced_block.hpp"
+#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+# include "asio/detail/gcc_x86_fenced_block.hpp"
+#elif defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+# include "asio/detail/win_fenced_block.hpp"
+#else
+# include "asio/detail/null_fenced_block.hpp"
+#endif
+
+namespace asio {
+namespace detail {
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+typedef null_fenced_block fenced_block;
+#elif defined(__MACH__) && defined(__APPLE__)
+typedef macos_fenced_block fenced_block;
+#elif defined(__sun)
+typedef solaris_fenced_block fenced_block;
+#elif defined(__GNUC__) \
+  && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)) \
+  && !defined(__INTEL_COMPILER) && !defined(__ICL) \
+  && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
+typedef gcc_fenced_block fenced_block;
+#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+typedef gcc_x86_fenced_block fenced_block;
+#elif defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+typedef win_fenced_block fenced_block;
+#else
+typedef null_fenced_block fenced_block;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_FENCED_BLOCK_HPP
diff --git a/ext/asio/detail/gcc_fenced_block.hpp b/ext/asio/detail/gcc_fenced_block.hpp
new file mode 100644
index 0000000000..23303fbf2e
--- /dev/null
+++ b/ext/asio/detail/gcc_fenced_block.hpp
@@ -0,0 +1,63 @@
+//
+// gcc_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_GCC_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_GCC_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(__GNUC__) \
+  && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)) \
+  && !defined(__INTEL_COMPILER) && !defined(__ICL) \
+  && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
+
+namespace asio {
+namespace detail {
+
+class gcc_fenced_block
+  : private noncopyable
+{
+public:
+  // Constructor.
+  gcc_fenced_block()
+    : value_(0)
+  {
+    __sync_lock_test_and_set(&value_, 1);
+  }
+
+  // Destructor.
+  ~gcc_fenced_block()
+  {
+    __sync_lock_release(&value_);
+  }
+
+private:
+  int value_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(__GNUC__)
+       // && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4))
+       // && !defined(__INTEL_COMPILER) && !defined(__ICL)
+       // && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_GCC_FENCED_BLOCK_HPP
diff --git a/ext/asio/detail/gcc_x86_fenced_block.hpp b/ext/asio/detail/gcc_x86_fenced_block.hpp
new file mode 100644
index 0000000000..48119f4c39
--- /dev/null
+++ b/ext/asio/detail/gcc_x86_fenced_block.hpp
@@ -0,0 +1,61 @@
+//
+// gcc_x86_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+
+namespace asio {
+namespace detail {
+
+class gcc_x86_fenced_block
+  : private noncopyable
+{
+public:
+  // Constructor.
+  gcc_x86_fenced_block()
+  {
+    barrier();
+  }
+
+  // Destructor.
+  ~gcc_x86_fenced_block()
+  {
+    barrier();
+  }
+
+private:
+  static int barrier()
+  {
+    int r = 0;
+    __asm__ __volatile__ ("xchgl %%eax, %0" : "=m" (r) : : "memory", "cc");
+    return r;
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
diff --git a/ext/asio/detail/handler_alloc_helpers.hpp b/ext/asio/detail/handler_alloc_helpers.hpp
new file mode 100644
index 0000000000..0ac42a7b12
--- /dev/null
+++ b/ext/asio/detail/handler_alloc_helpers.hpp
@@ -0,0 +1,259 @@
+//
+// handler_alloc_helpers.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
+#define ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/detail/workaround.hpp>
+#include <boost/utility/addressof.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/handler_alloc_hook.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+// Calls to asio_handler_allocate and asio_handler_deallocate must be made from
+// a namespace that does not contain any overloads of these functions. The
+// asio_handler_alloc_helpers namespace is defined here for that purpose.
+namespace asio_handler_alloc_helpers {
+
+template <typename Handler>
+inline void* allocate(std::size_t s, Handler& h)
+{
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \
+  || BOOST_WORKAROUND(__GNUC__, < 3)
+  return ::operator new(s);
+#else
+  using namespace asio;
+  return asio_handler_allocate(s, boost::addressof(h));
+#endif
+}
+
+template <typename Handler>
+inline void deallocate(void* p, std::size_t s, Handler& h)
+{
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \
+  || BOOST_WORKAROUND(__GNUC__, < 3)
+  ::operator delete(p);
+#else
+  using namespace asio;
+  asio_handler_deallocate(p, s, boost::addressof(h));
+#endif
+}
+
+} // namespace asio_handler_alloc_helpers
+
+namespace asio {
+namespace detail {
+
+// Traits for handler allocation.
+template <typename Handler, typename Object>
+struct handler_alloc_traits
+{
+  typedef Handler handler_type;
+  typedef Object value_type;
+  typedef Object* pointer_type;
+  BOOST_STATIC_CONSTANT(std::size_t, value_size = sizeof(Object));
+};
+
+template <typename Alloc_Traits>
+class handler_ptr;
+
+// Helper class to provide RAII on uninitialised handler memory.
+template <typename Alloc_Traits>
+class raw_handler_ptr
+  : private noncopyable
+{
+public:
+  typedef typename Alloc_Traits::handler_type handler_type;
+  typedef typename Alloc_Traits::value_type value_type;
+  typedef typename Alloc_Traits::pointer_type pointer_type;
+  BOOST_STATIC_CONSTANT(std::size_t, value_size = Alloc_Traits::value_size);
+
+  // Constructor allocates the memory.
+  raw_handler_ptr(handler_type& handler)
+    : handler_(handler),
+      pointer_(static_cast<pointer_type>(
+            asio_handler_alloc_helpers::allocate(value_size, handler_)))
+  {
+  }
+
+  // Destructor automatically deallocates memory, unless it has been stolen by
+  // a handler_ptr object.
+  ~raw_handler_ptr()
+  {
+    if (pointer_)
+      asio_handler_alloc_helpers::deallocate(
+          pointer_, value_size, handler_);
+  }
+
+private:
+  friend class handler_ptr<Alloc_Traits>;
+  handler_type& handler_;
+  pointer_type pointer_;
+};
+
+// Helper class to provide RAII on uninitialised handler memory.
+template <typename Alloc_Traits>
+class handler_ptr
+  : private noncopyable
+{
+public:
+  typedef typename Alloc_Traits::handler_type handler_type;
+  typedef typename Alloc_Traits::value_type value_type;
+  typedef typename Alloc_Traits::pointer_type pointer_type;
+  BOOST_STATIC_CONSTANT(std::size_t, value_size = Alloc_Traits::value_size);
+  typedef raw_handler_ptr<Alloc_Traits> raw_ptr_type;
+
+  // Take ownership of existing memory.
+  handler_ptr(handler_type& handler, pointer_type pointer)
+    : handler_(handler),
+      pointer_(pointer)
+  {
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  handler_ptr(raw_ptr_type& raw_ptr)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type)
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4, a5))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5, typename Arg6>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5, Arg6& a6)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4, a5, a6))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5, typename Arg6, typename Arg7>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5, Arg6& a6, Arg7& a7)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4, a5, a6, a7))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5, typename Arg6, typename Arg7, typename Arg8>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5, Arg6& a6, Arg7& a7, Arg8& a8)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(
+            a1, a2, a3, a4, a5, a6, a7, a8))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Destructor automatically deallocates memory, unless it has been released.
+  ~handler_ptr()
+  {
+    reset();
+  }
+
+  // Get the memory.
+  pointer_type get() const
+  {
+    return pointer_;
+  }
+
+  // Release ownership of the memory.
+  pointer_type release()
+  {
+    pointer_type tmp = pointer_;
+    pointer_ = 0;
+    return tmp;
+  }
+
+  // Explicitly destroy and deallocate the memory.
+  void reset()
+  {
+    if (pointer_)
+    {
+      pointer_->value_type::~value_type();
+      asio_handler_alloc_helpers::deallocate(
+          pointer_, value_size, handler_);
+      pointer_ = 0;
+    }
+  }
+
+private:
+  handler_type& handler_;
+  pointer_type pointer_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
diff --git a/ext/asio/detail/handler_invoke_helpers.hpp b/ext/asio/detail/handler_invoke_helpers.hpp
new file mode 100644
index 0000000000..8332567c9f
--- /dev/null
+++ b/ext/asio/detail/handler_invoke_helpers.hpp
@@ -0,0 +1,49 @@
+//
+// handler_invoke_helpers.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
+#define ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/detail/workaround.hpp>
+#include <boost/utility/addressof.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/handler_invoke_hook.hpp"
+
+// Calls to asio_handler_invoke must be made from a namespace that does not
+// contain overloads of this function. The asio_handler_invoke_helpers
+// namespace is defined here for that purpose.
+namespace asio_handler_invoke_helpers {
+
+template <typename Function, typename Context>
+inline void invoke(const Function& function, Context& context)
+{
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \
+  || BOOST_WORKAROUND(__GNUC__, < 3)
+  Function tmp(function);
+  tmp();
+#else
+  using namespace asio;
+  asio_handler_invoke(function, boost::addressof(context));
+#endif
+}
+
+} // namespace asio_handler_invoke_helpers
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
diff --git a/ext/asio/detail/hash_map.hpp b/ext/asio/detail/hash_map.hpp
new file mode 100644
index 0000000000..b2a1517865
--- /dev/null
+++ b/ext/asio/detail/hash_map.hpp
@@ -0,0 +1,324 @@
+//
+// hash_map.hpp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_HASH_MAP_HPP
+#define ASIO_DETAIL_HASH_MAP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cassert>
+#include <list>
+#include <utility>
+#include <boost/functional/hash.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename T>
+inline std::size_t calculate_hash_value(const T& t)
+{
+  return boost::hash_value(t);
+}
+
+#if defined(_WIN64)
+inline std::size_t calculate_hash_value(SOCKET s)
+{
+  return static_cast<std::size_t>(s);
+}
+#endif // defined(_WIN64)
+
+// Note: assumes K and V are POD types.
+template <typename K, typename V>
+class hash_map
+  : private noncopyable
+{
+public:
+  // The type of a value in the map.
+  typedef std::pair<K, V> value_type;
+
+  // The type of a non-const iterator over the hash map.
+  typedef typename std::list<value_type>::iterator iterator;
+
+  // The type of a const iterator over the hash map.
+  typedef typename std::list<value_type>::const_iterator const_iterator;
+
+  // Constructor.
+  hash_map()
+    : size_(0),
+      buckets_(0),
+      num_buckets_(0)
+  {
+  }
+
+  // Destructor.
+  ~hash_map()
+  {
+    delete[] buckets_;
+  }
+
+  // Get an iterator for the beginning of the map.
+  iterator begin()
+  {
+    return values_.begin();
+  }
+
+  // Get an iterator for the beginning of the map.
+  const_iterator begin() const
+  {
+    return values_.begin();
+  }
+
+  // Get an iterator for the end of the map.
+  iterator end()
+  {
+    return values_.end();
+  }
+
+  // Get an iterator for the end of the map.
+  const_iterator end() const
+  {
+    return values_.end();
+  }
+
+  // Check whether the map is empty.
+  bool empty() const
+  {
+    return values_.empty();
+  }
+
+  // Find an entry in the map.
+  iterator find(const K& k)
+  {
+    if (num_buckets_)
+    {
+      size_t bucket = calculate_hash_value(k) % num_buckets_;
+      iterator it = buckets_[bucket].first;
+      if (it == values_.end())
+        return values_.end();
+      iterator end = buckets_[bucket].last;
+      ++end;
+      while (it != end)
+      {
+        if (it->first == k)
+          return it;
+        ++it;
+      }
+    }
+    return values_.end();
+  }
+
+  // Find an entry in the map.
+  const_iterator find(const K& k) const
+  {
+    if (num_buckets_)
+    {
+      size_t bucket = calculate_hash_value(k) % num_buckets_;
+      const_iterator it = buckets_[bucket].first;
+      if (it == values_.end())
+        return it;
+      const_iterator end = buckets_[bucket].last;
+      ++end;
+      while (it != end)
+      {
+        if (it->first == k)
+          return it;
+        ++it;
+      }
+    }
+    return values_.end();
+  }
+
+  // Insert a new entry into the map.
+  std::pair<iterator, bool> insert(const value_type& v)
+  {
+    if (size_ + 1 >= num_buckets_)
+      rehash(hash_size(size_ + 1));
+    size_t bucket = calculate_hash_value(v.first) % num_buckets_;
+    iterator it = buckets_[bucket].first;
+    if (it == values_.end())
+    {
+      buckets_[bucket].first = buckets_[bucket].last =
+        values_insert(values_.end(), v);
+      ++size_;
+      return std::pair<iterator, bool>(buckets_[bucket].last, true);
+    }
+    iterator end = buckets_[bucket].last;
+    ++end;
+    while (it != end)
+    {
+      if (it->first == v.first)
+        return std::pair<iterator, bool>(it, false);
+      ++it;
+    }
+    buckets_[bucket].last = values_insert(end, v);
+    ++size_;
+    return std::pair<iterator, bool>(buckets_[bucket].last, true);
+  }
+
+  // Erase an entry from the map.
+  void erase(iterator it)
+  {
+    assert(it != values_.end());
+
+    size_t bucket = calculate_hash_value(it->first) % num_buckets_;
+    bool is_first = (it == buckets_[bucket].first);
+    bool is_last = (it == buckets_[bucket].last);
+    if (is_first && is_last)
+      buckets_[bucket].first = buckets_[bucket].last = values_.end();
+    else if (is_first)
+      ++buckets_[bucket].first;
+    else if (is_last)
+      --buckets_[bucket].last;
+
+    values_erase(it);
+    --size_;
+  }
+
+  // Erase a key from the map.
+  void erase(const K& k)
+  {
+    iterator it = find(k);
+    if (it != values_.end())
+      erase(it);
+  }
+
+  // Remove all entries from the map.
+  void clear()
+  {
+    // Clear the values.
+    values_.clear();
+    size_ = 0;
+
+    // Initialise all buckets to empty.
+    iterator end = values_.end();
+    for (size_t i = 0; i < num_buckets_; ++i)
+      buckets_[i].first = buckets_[i].last = end;
+  }
+
+private:
+  // Calculate the hash size for the specified number of elements.
+  static std::size_t hash_size(std::size_t num_elems)
+  {
+    static std::size_t sizes[] =
+    {
+#if defined(ASIO_HASH_MAP_BUCKETS)
+      ASIO_HASH_MAP_BUCKETS
+#else // ASIO_HASH_MAP_BUCKETS
+      3, 13, 23, 53, 97, 193, 389, 769, 1543, 3079, 6151, 12289, 24593,
+      49157, 98317, 196613, 393241, 786433, 1572869, 3145739, 6291469,
+      12582917, 25165843
+#endif // ASIO_HASH_MAP_BUCKETS
+    };
+    const std::size_t nth_size = sizeof(sizes) / sizeof(std::size_t) - 1;
+    for (std::size_t i = 0; i < nth_size; ++i)
+      if (num_elems < sizes[i])
+        return sizes[i];
+    return sizes[nth_size];
+  }
+
+  // Re-initialise the hash from the values already contained in the list.
+  void rehash(std::size_t num_buckets)
+  {
+    if (num_buckets == num_buckets_)
+      return;
+    num_buckets_ = num_buckets;
+
+    iterator end = values_.end();
+
+    // Update number of buckets and initialise all buckets to empty.
+    bucket_type* tmp = new bucket_type[num_buckets_];
+    delete[] buckets_;
+    buckets_ = tmp;
+    for (std::size_t i = 0; i < num_buckets_; ++i)
+      buckets_[i].first = buckets_[i].last = end;
+
+    // Put all values back into the hash.
+    iterator iter = values_.begin();
+    while (iter != end)
+    {
+      std::size_t bucket = calculate_hash_value(iter->first) % num_buckets_;
+      if (buckets_[bucket].last == end)
+      {
+        buckets_[bucket].first = buckets_[bucket].last = iter++;
+      }
+      else if (++buckets_[bucket].last == iter)
+      {
+        ++iter;
+      }
+      else
+      {
+        values_.splice(buckets_[bucket].last, values_, iter++);
+        --buckets_[bucket].last;
+      }
+    }
+  }
+
+  // Insert an element into the values list by splicing from the spares list,
+  // if a spare is available, and otherwise by inserting a new element.
+  iterator values_insert(iterator it, const value_type& v)
+  {
+    if (spares_.empty())
+    {
+      return values_.insert(it, v);
+    }
+    else
+    {
+      spares_.front() = v;
+      values_.splice(it, spares_, spares_.begin());
+      return --it;
+    }
+  }
+
+  // Erase an element from the values list by splicing it to the spares list.
+  void values_erase(iterator it)
+  {
+    *it = value_type();
+    spares_.splice(spares_.begin(), values_, it);
+  }
+
+  // The number of elements in the hash.
+  std::size_t size_;
+
+  // The list of all values in the hash map.
+  std::list<value_type> values_;
+
+  // The list of spare nodes waiting to be recycled. Assumes that POD types only
+  // are stored in the hash map.
+  std::list<value_type> spares_;
+
+  // The type for a bucket in the hash table.
+  struct bucket_type
+  {
+    iterator first;
+    iterator last;
+  };
+
+  // The buckets in the hash.
+  bucket_type* buckets_;
+
+  // The number of buckets in the hash.
+  std::size_t num_buckets_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_HASH_MAP_HPP
diff --git a/ext/asio/detail/io_control.hpp b/ext/asio/detail/io_control.hpp
new file mode 100644
index 0000000000..df7171cbe2
--- /dev/null
+++ b/ext/asio/detail/io_control.hpp
@@ -0,0 +1,137 @@
+//
+// io_control.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_IO_CONTROL_HPP
+#define ASIO_DETAIL_IO_CONTROL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+namespace io_control {
+
+// IO control command for non-blocking I/O.
+class non_blocking_io
+{
+public:
+  // Default constructor.
+  non_blocking_io()
+    : value_(0)
+  {
+  }
+
+  // Construct with a specific command value.
+  non_blocking_io(bool value)
+    : value_(value ? 1 : 0)
+  {
+  }
+
+  // Get the name of the IO control command.
+  int name() const
+  {
+    return FIONBIO;
+  }
+
+  // Set the value of the I/O control command.
+  void set(bool value)
+  {
+    value_ = value ? 1 : 0;
+  }
+
+  // Get the current value of the I/O control command.
+  bool get() const
+  {
+    return value_ != 0;
+  }
+
+  // Get the address of the command data.
+  detail::ioctl_arg_type* data()
+  {
+    return &value_;
+  }
+
+  // Get the address of the command data.
+  const detail::ioctl_arg_type* data() const
+  {
+    return &value_;
+  }
+
+private:
+  detail::ioctl_arg_type value_;
+};
+
+// I/O control command for getting number of bytes available.
+class bytes_readable
+{
+public:
+  // Default constructor.
+  bytes_readable()
+    : value_(0)
+  {
+  }
+
+  // Construct with a specific command value.
+  bytes_readable(std::size_t value)
+    : value_(static_cast<detail::ioctl_arg_type>(value))
+  {
+  }
+
+  // Get the name of the IO control command.
+  int name() const
+  {
+    return FIONREAD;
+  }
+
+  // Set the value of the I/O control command.
+  void set(std::size_t value)
+  {
+    value_ = static_cast<detail::ioctl_arg_type>(value);
+  }
+
+  // Get the current value of the I/O control command.
+  std::size_t get() const
+  {
+    return static_cast<std::size_t>(value_);
+  }
+
+  // Get the address of the command data.
+  detail::ioctl_arg_type* data()
+  {
+    return &value_;
+  }
+
+  // Get the address of the command data.
+  const detail::ioctl_arg_type* data() const
+  {
+    return &value_;
+  }
+
+private:
+  detail::ioctl_arg_type value_;
+};
+
+} // namespace io_control
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_IO_CONTROL_HPP
diff --git a/ext/asio/detail/kqueue_reactor.hpp b/ext/asio/detail/kqueue_reactor.hpp
new file mode 100644
index 0000000000..1e118b3118
--- /dev/null
+++ b/ext/asio/detail/kqueue_reactor.hpp
@@ -0,0 +1,485 @@
+//
+// kqueue_reactor.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2005 Stefan Arentz (stefan at soze dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_KQUEUE_REACTOR_HPP
+#define ASIO_DETAIL_KQUEUE_REACTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/kqueue_reactor_fwd.hpp"
+
+#if defined(ASIO_HAS_KQUEUE)
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/hash_map.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/reactor_op.hpp"
+#include "asio/detail/select_interrupter.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/timer_op.hpp"
+#include "asio/detail/timer_queue_base.hpp"
+#include "asio/detail/timer_queue_fwd.hpp"
+#include "asio/detail/timer_queue_set.hpp"
+
+// Older versions of Mac OS X may not define EV_OOBAND.
+#if !defined(EV_OOBAND)
+# define EV_OOBAND EV_FLAG1
+#endif // !defined(EV_OOBAND)
+
+namespace asio {
+namespace detail {
+
+class kqueue_reactor
+  : public asio::detail::service_base<kqueue_reactor>
+{
+public:
+  enum op_types { read_op = 0, write_op = 1,
+    connect_op = 1, except_op = 2, max_ops = 3 };
+
+  // Per-descriptor queues.
+  struct descriptor_state
+  {
+    descriptor_state() {}
+    descriptor_state(const descriptor_state&) {}
+    void operator=(const descriptor_state&) {}
+
+    mutex mutex_;
+    op_queue<reactor_op> op_queue_[max_ops];
+    bool shutdown_;
+  };
+
+  // Per-descriptor data.
+  typedef descriptor_state* per_descriptor_data;
+
+  // Constructor.
+  kqueue_reactor(asio::io_service& io_service)
+    : asio::detail::service_base<kqueue_reactor>(io_service),
+      io_service_(use_service<io_service_impl>(io_service)),
+      mutex_(),
+      kqueue_fd_(do_kqueue_create()),
+      interrupter_(),
+      shutdown_(false)
+  {
+    // The interrupter is put into a permanently readable state. Whenever we
+    // want to interrupt the blocked kevent call we register a one-shot read
+    // operation against the descriptor.
+    interrupter_.interrupt();
+  }
+
+  // Destructor.
+  ~kqueue_reactor()
+  {
+    close(kqueue_fd_);
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    mutex::scoped_lock lock(mutex_);
+    shutdown_ = true;
+    lock.unlock();
+
+    op_queue<operation> ops;
+
+    descriptor_map::iterator iter = registered_descriptors_.begin();
+    descriptor_map::iterator end = registered_descriptors_.end();
+    while (iter != end)
+    {
+      for (int i = 0; i < max_ops; ++i)
+        ops.push(iter->second.op_queue_[i]);
+      iter->second.shutdown_ = true;
+      ++iter;
+    }
+
+    timer_queues_.get_all_timers(ops);
+  }
+
+  // Initialise the task.
+  void init_task()
+  {
+    io_service_.init_task();
+  }
+
+  // Register a socket with the reactor. Returns 0 on success, system error
+  // code on failure.
+  int register_descriptor(socket_type descriptor,
+      per_descriptor_data& descriptor_data)
+  {
+    mutex::scoped_lock lock(registered_descriptors_mutex_);
+
+    descriptor_map::iterator new_entry = registered_descriptors_.insert(
+          std::make_pair(descriptor, descriptor_state())).first;
+    descriptor_data = &new_entry->second;
+
+    descriptor_data->shutdown_ = false;
+
+    return 0;
+  }
+
+  // Start a new operation. The reactor operation will be performed when the
+  // given descriptor is flagged as ready, or an error has occurred.
+  void start_op(int op_type, socket_type descriptor,
+      per_descriptor_data& descriptor_data,
+      reactor_op* op, bool allow_speculative)
+  {
+    mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+    if (descriptor_data->shutdown_)
+      return;
+
+    bool first = descriptor_data->op_queue_[op_type].empty();
+    if (first)
+    {
+      if (allow_speculative)
+      {
+        if (op_type != read_op || descriptor_data->op_queue_[except_op].empty())
+        {
+          if (op->perform())
+          {
+            descriptor_lock.unlock();
+            io_service_.post_immediate_completion(op);
+            return;
+          }
+        }
+      }
+    }
+
+    descriptor_data->op_queue_[op_type].push(op);
+    io_service_.work_started();
+
+    if (first)
+    {
+      struct kevent event;
+      switch (op_type)
+      {
+      case read_op:
+        EV_SET(&event, descriptor, EVFILT_READ,
+            EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+        break;
+      case write_op:
+        EV_SET(&event, descriptor, EVFILT_WRITE,
+            EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+        break;
+      case except_op:
+        if (!descriptor_data->op_queue_[read_op].empty())
+          return; // Already registered for read events.
+        EV_SET(&event, descriptor, EVFILT_READ,
+            EV_ADD | EV_ONESHOT, EV_OOBAND, 0, descriptor_data);
+        break;
+      }
+
+      if (::kevent(kqueue_fd_, &event, 1, 0, 0, 0) == -1)
+      {
+        op->ec_ = asio::error_code(errno,
+            asio::error::get_system_category());
+        descriptor_data->op_queue_[op_type].pop();
+        io_service_.post_deferred_completion(op);
+      }
+    }
+  }
+
+  // Cancel all operations associated with the given descriptor. The
+  // handlers associated with the descriptor will be invoked with the
+  // operation_aborted error.
+  void cancel_ops(socket_type descriptor, per_descriptor_data& descriptor_data)
+  {
+    mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+    {
+      while (reactor_op* op = descriptor_data->op_queue_[i].front())
+      {
+        op->ec_ = asio::error::operation_aborted;
+        descriptor_data->op_queue_[i].pop();
+        ops.push(op);
+      }
+    }
+
+    descriptor_lock.unlock();
+
+    io_service_.post_deferred_completions(ops);
+  }
+
+  // Cancel any operations that are running against the descriptor and remove
+  // its registration from the reactor.
+  void close_descriptor(socket_type descriptor,
+      per_descriptor_data& descriptor_data)
+  {
+    mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+    mutex::scoped_lock descriptors_lock(registered_descriptors_mutex_);
+
+    // Remove the descriptor from the set of known descriptors. The descriptor
+    // will be automatically removed from the kqueue set when it is closed.
+    descriptor_data->shutdown_ = true;
+
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+    {
+      while (reactor_op* op = descriptor_data->op_queue_[i].front())
+      {
+        op->ec_ = asio::error::operation_aborted;
+        descriptor_data->op_queue_[i].pop();
+        ops.push(op);
+      }
+    }
+
+    descriptor_lock.unlock();
+
+    registered_descriptors_.erase(descriptor);
+
+    descriptors_lock.unlock();
+
+    io_service_.post_deferred_completions(ops);
+  }
+
+  // Add a new timer queue to the reactor.
+  template <typename Time_Traits>
+  void add_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    mutex::scoped_lock lock(mutex_);
+    timer_queues_.insert(&timer_queue);
+  }
+
+  // Remove a timer queue from the reactor.
+  template <typename Time_Traits>
+  void remove_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    mutex::scoped_lock lock(mutex_);
+    timer_queues_.erase(&timer_queue);
+  }
+
+  // Schedule a new operation in the given timer queue to expire at the
+  // specified absolute time.
+  template <typename Time_Traits>
+  void schedule_timer(timer_queue<Time_Traits>& timer_queue,
+      const typename Time_Traits::time_type& time, timer_op* op, void* token)
+  {
+    mutex::scoped_lock lock(mutex_);
+    if (!shutdown_)
+    {
+      bool earliest = timer_queue.enqueue_timer(time, op, token);
+      io_service_.work_started();
+      if (earliest)
+        interrupt();
+    }
+  }
+
+  // Cancel the timer operations associated with the given token. Returns the
+  // number of operations that have been posted or dispatched.
+  template <typename Time_Traits>
+  std::size_t cancel_timer(timer_queue<Time_Traits>& timer_queue, void* token)
+  {
+    mutex::scoped_lock lock(mutex_);
+    op_queue<operation> ops;
+    std::size_t n = timer_queue.cancel_timer(token, ops);
+    lock.unlock();
+    io_service_.post_deferred_completions(ops);
+    return n;
+  }
+
+  // Run the kqueue loop.
+  void run(bool block, op_queue<operation>& ops)
+  {
+    mutex::scoped_lock lock(mutex_);
+
+    // Determine how long to block while waiting for events.
+    timespec timeout_buf = { 0, 0 };
+    timespec* timeout = block ? get_timeout(timeout_buf) : &timeout_buf;
+
+    lock.unlock();
+
+    // Block on the kqueue descriptor.
+    struct kevent events[128];
+    int num_events = kevent(kqueue_fd_, 0, 0, events, 128, timeout);
+
+    // Dispatch the waiting events.
+    for (int i = 0; i < num_events; ++i)
+    {
+      int descriptor = events[i].ident;
+      void* ptr = events[i].udata;
+      if (ptr == &interrupter_)
+      {
+        // No need to reset the interrupter since we're leaving the descriptor
+        // in a ready-to-read state and relying on one-shot notifications.
+      }
+      else
+      {
+        descriptor_state* descriptor_data = static_cast<descriptor_state*>(ptr);
+        mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+        // Exception operations must be processed first to ensure that any
+        // out-of-band data is read before normal data.
+        static const int filter[max_ops] =
+          { EVFILT_READ, EVFILT_WRITE, EVFILT_READ };
+        for (int j = max_ops - 1; j >= 0; --j)
+        {
+          if (events[i].filter == filter[j])
+          {
+            if (j != except_op || events[i].flags & EV_OOBAND)
+            {
+              while (reactor_op* op = descriptor_data->op_queue_[j].front())
+              {
+                if (events[i].flags & EV_ERROR)
+                {
+                  op->ec_ = asio::error_code(events[i].data,
+                      asio::error::get_system_category());
+                  descriptor_data->op_queue_[j].pop();
+                  ops.push(op);
+                }
+                if (op->perform())
+                {
+                  descriptor_data->op_queue_[j].pop();
+                  ops.push(op);
+                }
+                else
+                  break;
+              }
+            }
+          }
+        }
+
+        // Renew registration for event notifications.
+        struct kevent event;
+        switch (events[i].filter)
+        {
+        case EVFILT_READ:
+          if (!descriptor_data->op_queue_[read_op].empty())
+            EV_SET(&event, descriptor, EVFILT_READ,
+                EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+          else if (!descriptor_data->op_queue_[except_op].empty())
+            EV_SET(&event, descriptor, EVFILT_READ,
+                EV_ADD | EV_ONESHOT, EV_OOBAND, 0, descriptor_data);
+          else
+            continue;
+        case EVFILT_WRITE:
+          if (!descriptor_data->op_queue_[write_op].empty())
+            EV_SET(&event, descriptor, EVFILT_WRITE,
+                EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+          else
+            continue;
+        default:
+          break;
+        }
+        if (::kevent(kqueue_fd_, &event, 1, 0, 0, 0) == -1)
+        {
+          asio::error_code error(errno,
+              asio::error::get_system_category());
+          for (int j = 0; j < max_ops; ++j)
+          {
+            while (reactor_op* op = descriptor_data->op_queue_[j].front())
+            {
+              op->ec_ = error;
+              descriptor_data->op_queue_[j].pop();
+              ops.push(op);
+            }
+          }
+        }
+      }
+    }
+
+    lock.lock();
+    timer_queues_.get_ready_timers(ops);
+  }
+
+  // Interrupt the kqueue loop.
+  void interrupt()
+  {
+    struct kevent event;
+    EV_SET(&event, interrupter_.read_descriptor(),
+        EVFILT_READ, EV_ADD | EV_ONESHOT, 0, 0, &interrupter_);
+    ::kevent(kqueue_fd_, &event, 1, 0, 0, 0);
+  }
+
+private:
+  // Create the kqueue file descriptor. Throws an exception if the descriptor
+  // cannot be created.
+  static int do_kqueue_create()
+  {
+    int fd = kqueue();
+    if (fd == -1)
+    {
+      boost::throw_exception(
+          asio::system_error(
+            asio::error_code(errno,
+              asio::error::get_system_category()),
+            "kqueue"));
+    }
+    return fd;
+  }
+
+  // Get the timeout value for the kevent call.
+  timespec* get_timeout(timespec& ts)
+  {
+    // By default we will wait no longer than 5 minutes. This will ensure that
+    // any changes to the system clock are detected after no longer than this.
+    long usec = timer_queues_.wait_duration_usec(5 * 60 * 1000 * 1000);
+    ts.tv_sec = usec / 1000000;
+    ts.tv_nsec = (usec % 1000000) * 1000;
+    return &ts;
+  }
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_;
+
+  // Mutex to protect access to internal data.
+  mutex mutex_;
+
+  // The kqueue file descriptor.
+  int kqueue_fd_;
+
+  // The interrupter is used to break a blocking kevent call.
+  select_interrupter interrupter_;
+
+  // The timer queues.
+  timer_queue_set timer_queues_;
+
+  // Whether the service has been shut down.
+  bool shutdown_;
+
+  // Mutex to protect access to the registered descriptors.
+  mutex registered_descriptors_mutex_;
+
+  // Keep track of all registered descriptors. This code relies on the fact that
+  // the hash_map implementation pools deleted nodes, meaning that we can assume
+  // our descriptor_state pointer remains valid even after the entry is removed.
+  // Technically this is not true for C++98, as that standard says that spliced
+  // elements in a list are invalidated. However, C++0x fixes this shortcoming
+  // so we'll just assume that C++98 std::list implementations will do the right
+  // thing anyway.
+  typedef detail::hash_map<socket_type, descriptor_state> descriptor_map;
+  descriptor_map registered_descriptors_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_KQUEUE)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_KQUEUE_REACTOR_HPP
diff --git a/ext/asio/detail/kqueue_reactor_fwd.hpp b/ext/asio/detail/kqueue_reactor_fwd.hpp
new file mode 100644
index 0000000000..abbc0c7d7b
--- /dev/null
+++ b/ext/asio/detail/kqueue_reactor_fwd.hpp
@@ -0,0 +1,44 @@
+//
+// kqueue_reactor_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2005 Stefan Arentz (stefan at soze dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_KQUEUE_REACTOR_FWD_HPP
+#define ASIO_DETAIL_KQUEUE_REACTOR_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#if !defined(ASIO_DISABLE_KQUEUE)
+
+#if (defined(__MACH__) && defined(__APPLE__)) \
+  || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+
+// Define this to indicate that kqueue is supported on the target platform.
+#define ASIO_HAS_KQUEUE 1
+
+namespace asio {
+namespace detail {
+
+class kqueue_reactor;
+
+} // namespace detail
+} // namespace asio
+
+#endif // (defined(__MACH__) && defined(__APPLE__))
+       // || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+
+#endif // !defined(ASIO_DISABLE_KQUEUE)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_KQUEUE_REACTOR_FWD_HPP
diff --git a/ext/asio/detail/local_free_on_block_exit.hpp b/ext/asio/detail/local_free_on_block_exit.hpp
new file mode 100644
index 0000000000..554943c817
--- /dev/null
+++ b/ext/asio/detail/local_free_on_block_exit.hpp
@@ -0,0 +1,59 @@
+//
+// local_free_on_block_exit.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_LOCAL_FREE_ON_BLOCK_EXIT_HPP
+#define ASIO_DETAIL_LOCAL_FREE_ON_BLOCK_EXIT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+class local_free_on_block_exit
+  : private noncopyable
+{
+public:
+  // Constructor blocks all signals for the calling thread.
+  explicit local_free_on_block_exit(void* p)
+    : p_(p)
+  {
+  }
+
+  // Destructor restores the previous signal mask.
+  ~local_free_on_block_exit()
+  {
+    ::LocalFree(p_);
+  }
+
+private:
+  void* p_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_LOCAL_FREE_ON_BLOCK_EXIT_HPP
diff --git a/ext/asio/detail/macos_fenced_block.hpp b/ext/asio/detail/macos_fenced_block.hpp
new file mode 100644
index 0000000000..3c303d62bc
--- /dev/null
+++ b/ext/asio/detail/macos_fenced_block.hpp
@@ -0,0 +1,57 @@
+//
+// macos_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_MACOS_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_MACOS_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(__MACH__) && defined(__APPLE__)
+
+#include "asio/detail/push_options.hpp"
+#include <libkern/OSAtomic.h>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class macos_fenced_block
+  : private noncopyable
+{
+public:
+  // Constructor.
+  macos_fenced_block()
+  {
+    OSMemoryBarrier();
+  }
+
+  // Destructor.
+  ~macos_fenced_block()
+  {
+    OSMemoryBarrier();
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(__MACH__) && defined(__APPLE__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_MACOS_FENCED_BLOCK_HPP
diff --git a/ext/asio/detail/mutex.hpp b/ext/asio/detail/mutex.hpp
new file mode 100644
index 0000000000..024ec7f43f
--- /dev/null
+++ b/ext/asio/detail/mutex.hpp
@@ -0,0 +1,50 @@
+//
+// mutex.hpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_MUTEX_HPP
+#define ASIO_DETAIL_MUTEX_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+# include "asio/detail/null_mutex.hpp"
+#elif defined(BOOST_WINDOWS)
+# include "asio/detail/win_mutex.hpp"
+#elif defined(BOOST_HAS_PTHREADS)
+# include "asio/detail/posix_mutex.hpp"
+#else
+# error Only Windows and POSIX are supported!
+#endif
+
+namespace asio {
+namespace detail {
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+typedef null_mutex mutex;
+#elif defined(BOOST_WINDOWS)
+typedef win_mutex mutex;
+#elif defined(BOOST_HAS_PTHREADS)
+typedef posix_mutex mutex;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_MUTEX_HPP
diff --git a/ext/asio/detail/noncopyable.hpp b/ext/asio/detail/noncopyable.hpp
new file mode 100644
index 0000000000..8b73ff0407
--- /dev/null
+++ b/ext/asio/detail/noncopyable.hpp
@@ -0,0 +1,55 @@
+//
+// noncopyable.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NONCOPYABLE_HPP
+#define ASIO_DETAIL_NONCOPYABLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+// Redefine the noncopyable class for Borland C++ since that compiler does not
+// apply the empty base optimisation unless the base class contains a dummy
+// char data member.
+class noncopyable
+{
+protected:
+  noncopyable() {}
+  ~noncopyable() {}
+private:
+  noncopyable(const noncopyable&);
+  const noncopyable& operator=(const noncopyable&);
+  char dummy_;
+};
+#else
+using boost::noncopyable;
+#endif
+
+} // namespace detail
+
+using asio::detail::noncopyable;
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NONCOPYABLE_HPP
diff --git a/ext/asio/detail/null_buffers_op.hpp b/ext/asio/detail/null_buffers_op.hpp
new file mode 100644
index 0000000000..b44de2f077
--- /dev/null
+++ b/ext/asio/detail/null_buffers_op.hpp
@@ -0,0 +1,77 @@
+//
+// null_buffers_op.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_BUFFERS_OP_HPP
+#define ASIO_DETAIL_NULL_BUFFERS_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/reactor_op.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Handler>
+class null_buffers_op : public reactor_op
+{
+public:
+  null_buffers_op(Handler handler)
+    : reactor_op(&null_buffers_op::do_perform, &null_buffers_op::do_complete),
+      handler_(handler)
+  {
+  }
+
+  static bool do_perform(reactor_op*)
+  {
+    return true;
+  }
+
+  static void do_complete(io_service_impl* owner, operation* base,
+      asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+  {
+    // Take ownership of the handler object.
+    null_buffers_op* o(static_cast<null_buffers_op*>(base));
+    typedef handler_alloc_traits<Handler, null_buffers_op> alloc_traits;
+    handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+    // Make the upcall if required.
+    if (owner)
+    {
+      // Make a copy of the handler so that the memory can be deallocated
+      // before the upcall is made. Even if we're not about to make an upcall,
+      // a sub-object of the handler may be the true owner of the memory
+      // associated with the handler. Consequently, a local copy of the handler
+      // is required to ensure that any owning sub-object remains valid until
+      // after we have deallocated the memory here.
+      detail::binder2<Handler, asio::error_code, std::size_t>
+        handler(o->handler_, o->ec_, o->bytes_transferred_);
+      ptr.reset();
+      asio::detail::fenced_block b;
+      asio_handler_invoke_helpers::invoke(handler, handler);
+    }
+  }
+
+private:
+  Handler handler_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NULL_BUFFERS_OP_HPP
diff --git a/ext/asio/detail/null_event.hpp b/ext/asio/detail/null_event.hpp
new file mode 100644
index 0000000000..bcea31b804
--- /dev/null
+++ b/ext/asio/detail/null_event.hpp
@@ -0,0 +1,77 @@
+//
+// null_event.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_EVENT_HPP
+#define ASIO_DETAIL_NULL_EVENT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_event
+  : private noncopyable
+{
+public:
+  // Constructor.
+  null_event()
+  {
+  }
+
+  // Destructor.
+  ~null_event()
+  {
+  }
+
+  // Signal the event.
+  template <typename Lock>
+  void signal(Lock&)
+  {
+  }
+
+  // Signal the event and unlock the mutex.
+  template <typename Lock>
+  void signal_and_unlock(Lock&)
+  {
+  }
+
+  // Reset the event.
+  template <typename Lock>
+  void clear(Lock&)
+  {
+  }
+
+  // Wait for the event to become signalled.
+  template <typename Lock>
+  void wait(Lock&)
+  {
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NULL_EVENT_HPP
diff --git a/ext/asio/detail/null_fenced_block.hpp b/ext/asio/detail/null_fenced_block.hpp
new file mode 100644
index 0000000000..dd9a095a72
--- /dev/null
+++ b/ext/asio/detail/null_fenced_block.hpp
@@ -0,0 +1,43 @@
+//
+// null_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_NULL_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_fenced_block
+  : private noncopyable
+{
+public:
+  // Constructor.
+  null_fenced_block()
+  {
+  }
+
+  // Destructor.
+  ~null_fenced_block()
+  {
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NULL_FENCED_BLOCK_HPP
diff --git a/ext/asio/detail/null_mutex.hpp b/ext/asio/detail/null_mutex.hpp
new file mode 100644
index 0000000000..6661ef8324
--- /dev/null
+++ b/ext/asio/detail/null_mutex.hpp
@@ -0,0 +1,66 @@
+//
+// null_mutex.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_MUTEX_HPP
+#define ASIO_DETAIL_NULL_MUTEX_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/scoped_lock.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_mutex
+  : private noncopyable
+{
+public:
+  typedef asio::detail::scoped_lock<null_mutex> scoped_lock;
+
+  // Constructor.
+  null_mutex()
+  {
+  }
+
+  // Destructor.
+  ~null_mutex()
+  {
+  }
+
+  // Lock the mutex.
+  void lock()
+  {
+  }
+
+  // Unlock the mutex.
+  void unlock()
+  {
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NULL_MUTEX_HPP
diff --git a/ext/asio/detail/null_signal_blocker.hpp b/ext/asio/detail/null_signal_blocker.hpp
new file mode 100644
index 0000000000..a5db315acb
--- /dev/null
+++ b/ext/asio/detail/null_signal_blocker.hpp
@@ -0,0 +1,63 @@
+//
+// null_signal_blocker.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_SIGNAL_BLOCKER_HPP
+#define ASIO_DETAIL_NULL_SIGNAL_BLOCKER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_signal_blocker
+  : private noncopyable
+{
+public:
+  // Constructor blocks all signals for the calling thread.
+  null_signal_blocker()
+  {
+  }
+
+  // Destructor restores the previous signal mask.
+  ~null_signal_blocker()
+  {
+  }
+
+  // Block all signals for the calling thread.
+  void block()
+  {
+  }
+
+  // Restore the previous signal mask.
+  void unblock()
+  {
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NULL_SIGNAL_BLOCKER_HPP
diff --git a/ext/asio/detail/null_thread.hpp b/ext/asio/detail/null_thread.hpp
new file mode 100644
index 0000000000..d96883f336
--- /dev/null
+++ b/ext/asio/detail/null_thread.hpp
@@ -0,0 +1,68 @@
+//
+// null_thread.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_THREAD_HPP
+#define ASIO_DETAIL_NULL_THREAD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_thread
+  : private noncopyable
+{
+public:
+  // Constructor.
+  template <typename Function>
+  null_thread(Function f)
+  {
+    asio::system_error e(
+        asio::error::operation_not_supported, "thread");
+    boost::throw_exception(e);
+  }
+
+  // Destructor.
+  ~null_thread()
+  {
+  }
+
+  // Wait for the thread to exit.
+  void join()
+  {
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NULL_THREAD_HPP
diff --git a/ext/asio/detail/null_tss_ptr.hpp b/ext/asio/detail/null_tss_ptr.hpp
new file mode 100644
index 0000000000..112b4761c6
--- /dev/null
+++ b/ext/asio/detail/null_tss_ptr.hpp
@@ -0,0 +1,70 @@
+//
+// null_tss_ptr.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_TSS_PTR_HPP
+#define ASIO_DETAIL_NULL_TSS_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename T>
+class null_tss_ptr
+  : private noncopyable
+{
+public:
+  // Constructor.
+  null_tss_ptr()
+    : value_(0)
+  {
+  }
+
+  // Destructor.
+  ~null_tss_ptr()
+  {
+  }
+
+  // Get the value.
+  operator T*() const
+  {
+    return value_;
+  }
+
+  // Set the value.
+  void operator=(T* value)
+  {
+    value_ = value;
+  }
+
+private:
+  T* value_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NULL_TSS_PTR_HPP
diff --git a/ext/asio/detail/old_win_sdk_compat.hpp b/ext/asio/detail/old_win_sdk_compat.hpp
new file mode 100644
index 0000000000..70e5916d6a
--- /dev/null
+++ b/ext/asio/detail/old_win_sdk_compat.hpp
@@ -0,0 +1,340 @@
+//
+// old_win_sdk_compat.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_OLD_WIN_SDK_COMPAT_HPP
+#define ASIO_DETAIL_OLD_WIN_SDK_COMPAT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+// Guess whether we are building against on old Platform SDK.
+#if !defined(IN6ADDR_ANY_INIT)
+#define ASIO_HAS_OLD_WIN_SDK 1
+#endif // !defined(IN6ADDR_ANY_INIT)
+
+#if defined(ASIO_HAS_OLD_WIN_SDK)
+
+// Emulation of types that are missing from old Platform SDKs.
+//
+// N.B. this emulation is also used if building for a Windows 2000 target with
+// a recent (i.e. Vista or later) SDK, as the SDK does not provide IPv6 support
+// in that case.
+
+namespace asio {
+namespace detail {
+
+enum
+{
+  sockaddr_storage_maxsize = 128, // Maximum size.
+  sockaddr_storage_alignsize = (sizeof(__int64)), // Desired alignment.
+  sockaddr_storage_pad1size = (sockaddr_storage_alignsize - sizeof(short)),
+  sockaddr_storage_pad2size = (sockaddr_storage_maxsize -
+      (sizeof(short) + sockaddr_storage_pad1size + sockaddr_storage_alignsize))
+};
+
+struct sockaddr_storage_emulation
+{
+  short ss_family;
+  char __ss_pad1[sockaddr_storage_pad1size];
+  __int64 __ss_align;
+  char __ss_pad2[sockaddr_storage_pad2size];
+};
+
+struct in6_addr_emulation
+{
+  union
+  {
+    u_char Byte[16];
+    u_short Word[8];
+  } u;
+};
+
+#if !defined(s6_addr)
+# define _S6_un u
+# define _S6_u8 Byte
+# define s6_addr _S6_un._S6_u8
+#endif // !defined(s6_addr)
+
+struct sockaddr_in6_emulation
+{
+  short sin6_family;
+  u_short sin6_port;
+  u_long sin6_flowinfo;
+  in6_addr_emulation sin6_addr;
+  u_long sin6_scope_id;
+};
+
+struct ipv6_mreq_emulation
+{
+  in6_addr_emulation ipv6mr_multiaddr;
+  unsigned int ipv6mr_interface;
+};
+
+#if !defined(IN6ADDR_ANY_INIT)
+# define IN6ADDR_ANY_INIT { 0 }
+#endif
+
+#if !defined(IN6ADDR_LOOPBACK_INIT)
+# define IN6ADDR_LOOPBACK_INIT { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }
+#endif
+
+struct addrinfo_emulation
+{
+  int ai_flags;
+  int ai_family;
+  int ai_socktype;
+  int ai_protocol;
+  size_t ai_addrlen;
+  char* ai_canonname;
+  sockaddr* ai_addr;
+  addrinfo_emulation* ai_next;
+};
+
+#if !defined(AI_PASSIVE)
+# define AI_PASSIVE 0x1
+#endif
+
+#if !defined(AI_CANONNAME)
+# define AI_CANONNAME 0x2
+#endif
+
+#if !defined(AI_NUMERICHOST)
+# define AI_NUMERICHOST 0x4
+#endif
+
+#if !defined(EAI_AGAIN)
+# define EAI_AGAIN WSATRY_AGAIN
+#endif
+
+#if !defined(EAI_BADFLAGS)
+# define EAI_BADFLAGS WSAEINVAL
+#endif
+
+#if !defined(EAI_FAIL)
+# define EAI_FAIL WSANO_RECOVERY
+#endif
+
+#if !defined(EAI_FAMILY)
+# define EAI_FAMILY WSAEAFNOSUPPORT
+#endif
+
+#if !defined(EAI_MEMORY)
+# define EAI_MEMORY WSA_NOT_ENOUGH_MEMORY
+#endif
+
+#if !defined(EAI_NODATA)
+# define EAI_NODATA WSANO_DATA
+#endif
+
+#if !defined(EAI_NONAME)
+# define EAI_NONAME WSAHOST_NOT_FOUND
+#endif
+
+#if !defined(EAI_SERVICE)
+# define EAI_SERVICE WSATYPE_NOT_FOUND
+#endif
+
+#if !defined(EAI_SOCKTYPE)
+# define EAI_SOCKTYPE WSAESOCKTNOSUPPORT
+#endif
+
+#if !defined(NI_NOFQDN)
+# define NI_NOFQDN 0x01
+#endif
+
+#if !defined(NI_NUMERICHOST)
+# define NI_NUMERICHOST 0x02
+#endif
+
+#if !defined(NI_NAMEREQD)
+# define NI_NAMEREQD 0x04
+#endif
+
+#if !defined(NI_NUMERICSERV)
+# define NI_NUMERICSERV 0x08
+#endif
+
+#if !defined(NI_DGRAM)
+# define NI_DGRAM 0x10
+#endif
+
+#if !defined(IPPROTO_IPV6)
+# define IPPROTO_IPV6 41
+#endif
+
+#if !defined(IPV6_UNICAST_HOPS)
+# define IPV6_UNICAST_HOPS 4
+#endif
+
+#if !defined(IPV6_MULTICAST_IF)
+# define IPV6_MULTICAST_IF 9
+#endif
+
+#if !defined(IPV6_MULTICAST_HOPS)
+# define IPV6_MULTICAST_HOPS 10
+#endif
+
+#if !defined(IPV6_MULTICAST_LOOP)
+# define IPV6_MULTICAST_LOOP 11
+#endif
+
+#if !defined(IPV6_JOIN_GROUP)
+# define IPV6_JOIN_GROUP 12
+#endif
+
+#if !defined(IPV6_LEAVE_GROUP)
+# define IPV6_LEAVE_GROUP 13
+#endif
+
+inline int IN6_IS_ADDR_UNSPECIFIED(const in6_addr_emulation* a)
+{
+  return ((a->s6_addr[0] == 0)
+      && (a->s6_addr[1] == 0)
+      && (a->s6_addr[2] == 0)
+      && (a->s6_addr[3] == 0)
+      && (a->s6_addr[4] == 0)
+      && (a->s6_addr[5] == 0)
+      && (a->s6_addr[6] == 0)
+      && (a->s6_addr[7] == 0)
+      && (a->s6_addr[8] == 0)
+      && (a->s6_addr[9] == 0)
+      && (a->s6_addr[10] == 0)
+      && (a->s6_addr[11] == 0)
+      && (a->s6_addr[12] == 0)
+      && (a->s6_addr[13] == 0)
+      && (a->s6_addr[14] == 0)
+      && (a->s6_addr[15] == 0));
+}
+
+inline int IN6_IS_ADDR_LOOPBACK(const in6_addr_emulation* a)
+{
+  return ((a->s6_addr[0] == 0)
+      && (a->s6_addr[1] == 0)
+      && (a->s6_addr[2] == 0)
+      && (a->s6_addr[3] == 0)
+      && (a->s6_addr[4] == 0)
+      && (a->s6_addr[5] == 0)
+      && (a->s6_addr[6] == 0)
+      && (a->s6_addr[7] == 0)
+      && (a->s6_addr[8] == 0)
+      && (a->s6_addr[9] == 0)
+      && (a->s6_addr[10] == 0)
+      && (a->s6_addr[11] == 0)
+      && (a->s6_addr[12] == 0)
+      && (a->s6_addr[13] == 0)
+      && (a->s6_addr[14] == 0)
+      && (a->s6_addr[15] == 1));
+}
+
+inline int IN6_IS_ADDR_MULTICAST(const in6_addr_emulation* a)
+{
+  return (a->s6_addr[0] == 0xff);
+}
+
+inline int IN6_IS_ADDR_LINKLOCAL(const in6_addr_emulation* a)
+{
+  return ((a->s6_addr[0] == 0xfe) && ((a->s6_addr[1] & 0xc0) == 0x80));
+}
+
+inline int IN6_IS_ADDR_SITELOCAL(const in6_addr_emulation* a)
+{
+  return ((a->s6_addr[0] == 0xfe) && ((a->s6_addr[1] & 0xc0) == 0xc0));
+}
+
+inline int IN6_IS_ADDR_V4MAPPED(const in6_addr_emulation* a)
+{
+  return ((a->s6_addr[0] == 0)
+      && (a->s6_addr[1] == 0)
+      && (a->s6_addr[2] == 0)
+      && (a->s6_addr[3] == 0)
+      && (a->s6_addr[4] == 0)
+      && (a->s6_addr[5] == 0)
+      && (a->s6_addr[6] == 0)
+      && (a->s6_addr[7] == 0)
+      && (a->s6_addr[8] == 0)
+      && (a->s6_addr[9] == 0)
+      && (a->s6_addr[10] == 0xff)
+      && (a->s6_addr[11] == 0xff));
+}
+
+inline int IN6_IS_ADDR_V4COMPAT(const in6_addr_emulation* a)
+{
+  return ((a->s6_addr[0] == 0)
+      && (a->s6_addr[1] == 0)
+      && (a->s6_addr[2] == 0)
+      && (a->s6_addr[3] == 0)
+      && (a->s6_addr[4] == 0)
+      && (a->s6_addr[5] == 0)
+      && (a->s6_addr[6] == 0)
+      && (a->s6_addr[7] == 0)
+      && (a->s6_addr[8] == 0)
+      && (a->s6_addr[9] == 0)
+      && (a->s6_addr[10] == 0xff)
+      && (a->s6_addr[11] == 0xff)
+      && !((a->s6_addr[12] == 0)
+        && (a->s6_addr[13] == 0)
+        && (a->s6_addr[14] == 0)
+        && ((a->s6_addr[15] == 0) || (a->s6_addr[15] == 1))));
+}
+
+inline int IN6_IS_ADDR_MC_NODELOCAL(const in6_addr_emulation* a)
+{
+  return IN6_IS_ADDR_MULTICAST(a) && ((a->s6_addr[1] & 0xf) == 1);
+}
+
+inline int IN6_IS_ADDR_MC_LINKLOCAL(const in6_addr_emulation* a)
+{
+  return IN6_IS_ADDR_MULTICAST(a) && ((a->s6_addr[1] & 0xf) == 2);
+}
+
+inline int IN6_IS_ADDR_MC_SITELOCAL(const in6_addr_emulation* a)
+{
+  return IN6_IS_ADDR_MULTICAST(a) && ((a->s6_addr[1] & 0xf) == 5);
+}
+
+inline int IN6_IS_ADDR_MC_ORGLOCAL(const in6_addr_emulation* a)
+{
+  return IN6_IS_ADDR_MULTICAST(a) && ((a->s6_addr[1] & 0xf) == 8);
+}
+
+inline int IN6_IS_ADDR_MC_GLOBAL(const in6_addr_emulation* a)
+{
+  return IN6_IS_ADDR_MULTICAST(a) && ((a->s6_addr[1] & 0xf) == 0xe);
+}
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_OLD_WIN_SDK)
+
+// Even newer Platform SDKs that support IPv6 may not define IPV6_V6ONLY.
+#if !defined(IPV6_V6ONLY)
+# define IPV6_V6ONLY 27
+#endif
+
+// Some SDKs (e.g. Windows CE) don't define IPPROTO_ICMPV6.
+#if !defined(IPPROTO_ICMPV6)
+# define IPPROTO_ICMPV6 58
+#endif
+
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_OLD_WIN_SDK_COMPAT_HPP
diff --git a/ext/asio/detail/op_queue.hpp b/ext/asio/detail/op_queue.hpp
new file mode 100644
index 0000000000..ccf8b9a5c2
--- /dev/null
+++ b/ext/asio/detail/op_queue.hpp
@@ -0,0 +1,156 @@
+//
+// op_queue.hpp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_OP_QUEUE_HPP
+#define ASIO_DETAIL_OP_QUEUE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Operation>
+class op_queue;
+
+class op_queue_access
+{
+public:
+  template <typename Operation>
+  static Operation* next(Operation* o)
+  {
+    return static_cast<Operation*>(o->next_);
+  }
+
+  template <typename Operation1, typename Operation2>
+  static void next(Operation1*& o1, Operation2* o2)
+  {
+    o1->next_ = o2;
+  }
+
+  template <typename Operation>
+  static void destroy(Operation* o)
+  {
+    o->destroy();
+  }
+
+  template <typename Operation>
+  static Operation*& front(op_queue<Operation>& q)
+  {
+    return q.front_;
+  }
+
+  template <typename Operation>
+  static Operation*& back(op_queue<Operation>& q)
+  {
+    return q.back_;
+  }
+};
+
+template <typename Operation>
+class op_queue
+  : private noncopyable
+{
+public:
+  // Constructor.
+  op_queue()
+    : front_(0),
+      back_(0)
+  {
+  }
+
+  // Destructor destroys all operations.
+  ~op_queue()
+  {
+    while (Operation* op = front_)
+    {
+      pop();
+      op_queue_access::destroy(op);
+    }
+  }
+
+  // Get the operation at the front of the queue.
+  Operation* front()
+  {
+    return front_;
+  }
+
+  // Pop an operation from the front of the queue.
+  void pop()
+  {
+    if (front_)
+    {
+      Operation* tmp = front_;
+      front_ = op_queue_access::next(front_);
+      if (front_ == 0)
+        back_ = 0;
+      op_queue_access::next(tmp, static_cast<Operation*>(0));
+    }
+  }
+
+  // Push an operation on to the back of the queue.
+  void push(Operation* h)
+  {
+    op_queue_access::next(h, static_cast<Operation*>(0));
+    if (back_)
+    {
+      op_queue_access::next(back_, h);
+      back_ = h;
+    }
+    else
+    {
+      front_ = back_ = h;
+    }
+  }
+
+  // Push all operations from another queue on to the back of the queue. The
+  // source queue may contain operations of a derived type.
+  template <typename OtherOperation>
+  void push(op_queue<OtherOperation>& q)
+  {
+    if (Operation* other_front = op_queue_access::front(q))
+    {
+      if (back_)
+        op_queue_access::next(back_, other_front);
+      else
+        front_ = other_front;
+      back_ = op_queue_access::back(q);
+      op_queue_access::front(q) = 0;
+      op_queue_access::back(q) = 0;
+    }
+  }
+
+  // Whether the queue is empty.
+  bool empty() const
+  {
+    return front_ == 0;
+  }
+
+private:
+  friend class op_queue_access;
+
+  // The front of the queue.
+  Operation* front_;
+
+  // The back of the queue.
+  Operation* back_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_OP_QUEUE_HPP
diff --git a/ext/asio/detail/operation.hpp b/ext/asio/detail/operation.hpp
new file mode 100644
index 0000000000..6aba361218
--- /dev/null
+++ b/ext/asio/detail/operation.hpp
@@ -0,0 +1,43 @@
+//
+// operation.hpp
+// ~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_OPERATION_HPP
+#define ASIO_DETAIL_OPERATION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_operation.hpp"
+#else
+# include "asio/detail/reactor_fwd.hpp"
+# include "asio/detail/task_io_service_operation.hpp"
+#endif
+
+namespace asio {
+namespace detail {
+
+#if defined(ASIO_HAS_IOCP)
+typedef win_iocp_operation operation;
+#else
+typedef task_io_service_operation<reactor> operation;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_OPERATION_HPP
diff --git a/ext/asio/detail/pipe_select_interrupter.hpp b/ext/asio/detail/pipe_select_interrupter.hpp
new file mode 100644
index 0000000000..74695994dc
--- /dev/null
+++ b/ext/asio/detail/pipe_select_interrupter.hpp
@@ -0,0 +1,120 @@
+//
+// pipe_select_interrupter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP
+#define ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/push_options.hpp"
+#include <fcntl.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+class pipe_select_interrupter
+{
+public:
+  // Constructor.
+  pipe_select_interrupter()
+  {
+    int pipe_fds[2];
+    if (pipe(pipe_fds) == 0)
+    {
+      read_descriptor_ = pipe_fds[0];
+      ::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
+      write_descriptor_ = pipe_fds[1];
+      ::fcntl(write_descriptor_, F_SETFL, O_NONBLOCK);
+    }
+    else
+    {
+      asio::error_code ec(errno,
+          asio::error::get_system_category());
+      asio::system_error e(ec, "pipe_select_interrupter");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~pipe_select_interrupter()
+  {
+    if (read_descriptor_ != -1)
+      ::close(read_descriptor_);
+    if (write_descriptor_ != -1)
+      ::close(write_descriptor_);
+  }
+
+  // Interrupt the select call.
+  void interrupt()
+  {
+    char byte = 0;
+    int result = ::write(write_descriptor_, &byte, 1);
+    (void)result;
+  }
+
+  // Reset the select interrupt. Returns true if the call was interrupted.
+  bool reset()
+  {
+    for (;;)
+    {
+      char data[1024];
+      int bytes_read = ::read(read_descriptor_, data, sizeof(data));
+      if (bytes_read < 0 && errno == EINTR)
+        continue;
+      bool was_interrupted = (bytes_read > 0);
+      while (bytes_read == sizeof(data))
+        bytes_read = ::read(read_descriptor_, data, sizeof(data));
+      return was_interrupted;
+    }
+  }
+
+  // Get the read descriptor to be passed to select.
+  int read_descriptor() const
+  {
+    return read_descriptor_;
+  }
+
+private:
+  // The read end of a connection used to interrupt the select call. This file
+  // descriptor is passed to select such that when it is time to stop, a single
+  // byte will be written on the other end of the connection and this
+  // descriptor will become readable.
+  int read_descriptor_;
+
+  // The write end of a connection used to interrupt the select call. A single
+  // byte may be written to this to wake up the select which is waiting for the
+  // other end to become readable.
+  int write_descriptor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP
diff --git a/ext/asio/detail/pop_options.hpp b/ext/asio/detail/pop_options.hpp
new file mode 100644
index 0000000000..a26b2039c0
--- /dev/null
+++ b/ext/asio/detail/pop_options.hpp
@@ -0,0 +1,88 @@
+//
+// pop_options.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+// No header guard
+
+#if defined(__COMO__)
+
+// Comeau C++
+
+#elif defined(__DMC__)
+
+// Digital Mars C++
+
+#elif defined(__INTEL_COMPILER) || defined(__ICL) \
+  || defined(__ICC) || defined(__ECC)
+
+// Intel C++
+
+#elif defined(__GNUC__)
+
+// GNU C++
+
+# if defined(__MINGW32__) || defined(__CYGWIN__)
+#  pragma pack (pop)
+# endif
+
+#elif defined(__KCC)
+
+// Kai C++
+
+#elif defined(__sgi)
+
+// SGI MIPSpro C++
+
+#elif defined(__DECCXX)
+
+// Compaq Tru64 Unix cxx
+
+#elif defined(__ghs)
+
+// Greenhills C++
+
+#elif defined(__BORLANDC__)
+
+// Borland C++
+
+# pragma option pop
+# pragma nopushoptwarn
+# pragma nopackwarning
+
+#elif defined(__MWERKS__)
+
+// Metrowerks CodeWarrior
+
+#elif defined(__SUNPRO_CC)
+
+// Sun Workshop Compiler C++
+
+#elif defined(__HP_aCC)
+
+// HP aCC
+
+#elif defined(__MRC__) || defined(__SC__)
+
+// MPW MrCpp or SCpp
+
+#elif defined(__IBMCPP__)
+
+// IBM Visual Age
+
+#elif defined(_MSC_VER)
+
+// Microsoft Visual C++
+//
+// Must remain the last #elif since some other vendors (Metrowerks, for example)
+// also #define _MSC_VER
+
+# pragma warning (pop)
+# pragma pack (pop)
+
+#endif
diff --git a/ext/asio/detail/posix_event.hpp b/ext/asio/detail/posix_event.hpp
new file mode 100644
index 0000000000..49c15aa5a0
--- /dev/null
+++ b/ext/asio/detail/posix_event.hpp
@@ -0,0 +1,114 @@
+//
+// posix_event.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_POSIX_EVENT_HPP
+#define ASIO_DETAIL_POSIX_EVENT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/assert.hpp>
+#include <boost/throw_exception.hpp>
+#include <pthread.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+class posix_event
+  : private noncopyable
+{
+public:
+  // Constructor.
+  posix_event()
+    : signalled_(false)
+  {
+    int error = ::pthread_cond_init(&cond_, 0);
+    if (error != 0)
+    {
+      asio::system_error e(
+          asio::error_code(error,
+            asio::error::get_system_category()),
+          "event");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~posix_event()
+  {
+    ::pthread_cond_destroy(&cond_);
+  }
+
+  // Signal the event.
+  template <typename Lock>
+  void signal(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    (void)lock;
+    signalled_ = true;
+    ::pthread_cond_signal(&cond_); // Ignore EINVAL.
+  }
+
+  // Signal the event and unlock the mutex.
+  template <typename Lock>
+  void signal_and_unlock(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    signalled_ = true;
+    lock.unlock();
+    ::pthread_cond_signal(&cond_); // Ignore EINVAL.
+  }
+
+  // Reset the event.
+  template <typename Lock>
+  void clear(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    (void)lock;
+    signalled_ = false;
+  }
+
+  // Wait for the event to become signalled.
+  template <typename Lock>
+  void wait(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    while (!signalled_)
+      ::pthread_cond_wait(&cond_, &lock.mutex().mutex_); // Ignore EINVAL.
+  }
+
+private:
+  ::pthread_cond_t cond_;
+  bool signalled_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_POSIX_EVENT_HPP
diff --git a/ext/asio/detail/posix_fd_set_adapter.hpp b/ext/asio/detail/posix_fd_set_adapter.hpp
new file mode 100644
index 0000000000..17ef269cee
--- /dev/null
+++ b/ext/asio/detail/posix_fd_set_adapter.hpp
@@ -0,0 +1,81 @@
+//
+// posix_fd_set_adapter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_POSIX_FD_SET_ADAPTER_HPP
+#define ASIO_DETAIL_POSIX_FD_SET_ADAPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstring>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/socket_types.hpp"
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+namespace asio {
+namespace detail {
+
+// Adapts the FD_SET type to meet the Descriptor_Set concept's requirements.
+class posix_fd_set_adapter
+{
+public:
+  posix_fd_set_adapter()
+    : max_descriptor_(invalid_socket)
+  {
+    using namespace std; // Needed for memset on Solaris.
+    FD_ZERO(&fd_set_);
+  }
+
+  bool set(socket_type descriptor)
+  {
+    if (descriptor < (socket_type)FD_SETSIZE)
+    {
+      if (max_descriptor_ == invalid_socket || descriptor > max_descriptor_)
+        max_descriptor_ = descriptor;
+      FD_SET(descriptor, &fd_set_);
+      return true;
+    }
+    return false;
+  }
+
+  bool is_set(socket_type descriptor) const
+  {
+    return FD_ISSET(descriptor, &fd_set_) != 0;
+  }
+
+  operator fd_set*()
+  {
+    return &fd_set_;
+  }
+
+  socket_type max_descriptor() const
+  {
+    return max_descriptor_;
+  }
+
+private:
+  mutable fd_set fd_set_;
+  socket_type max_descriptor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_POSIX_FD_SET_ADAPTER_HPP
diff --git a/ext/asio/detail/posix_mutex.hpp b/ext/asio/detail/posix_mutex.hpp
new file mode 100644
index 0000000000..230b83a356
--- /dev/null
+++ b/ext/asio/detail/posix_mutex.hpp
@@ -0,0 +1,91 @@
+//
+// posix_mutex.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_POSIX_MUTEX_HPP
+#define ASIO_DETAIL_POSIX_MUTEX_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include <pthread.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/scoped_lock.hpp"
+
+namespace asio {
+namespace detail {
+
+class posix_event;
+
+class posix_mutex
+  : private noncopyable
+{
+public:
+  typedef asio::detail::scoped_lock<posix_mutex> scoped_lock;
+
+  // Constructor.
+  posix_mutex()
+  {
+    int error = ::pthread_mutex_init(&mutex_, 0);
+    if (error != 0)
+    {
+      asio::system_error e(
+          asio::error_code(error,
+            asio::error::get_system_category()),
+          "mutex");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~posix_mutex()
+  {
+    ::pthread_mutex_destroy(&mutex_); // Ignore EBUSY.
+  }
+
+  // Lock the mutex.
+  void lock()
+  {
+    (void)::pthread_mutex_lock(&mutex_); // Ignore EINVAL.
+  }
+
+  // Unlock the mutex.
+  void unlock()
+  {
+    (void)::pthread_mutex_unlock(&mutex_); // Ignore EINVAL.
+  }
+
+private:
+  friend class posix_event;
+  ::pthread_mutex_t mutex_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_POSIX_MUTEX_HPP
diff --git a/ext/asio/detail/posix_signal_blocker.hpp b/ext/asio/detail/posix_signal_blocker.hpp
new file mode 100644
index 0000000000..135ca41b7e
--- /dev/null
+++ b/ext/asio/detail/posix_signal_blocker.hpp
@@ -0,0 +1,90 @@
+//
+// posix_signal_blocker.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
+#define ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/push_options.hpp"
+#include <csignal>
+#include <pthread.h>
+#include <signal.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+class posix_signal_blocker
+  : private noncopyable
+{
+public:
+  // Constructor blocks all signals for the calling thread.
+  posix_signal_blocker()
+    : blocked_(false)
+  {
+    sigset_t new_mask;
+    sigfillset(&new_mask);
+    blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0);
+  }
+
+  // Destructor restores the previous signal mask.
+  ~posix_signal_blocker()
+  {
+    if (blocked_)
+      pthread_sigmask(SIG_SETMASK, &old_mask_, 0);
+  }
+
+  // Block all signals for the calling thread.
+  void block()
+  {
+    if (!blocked_)
+    {
+      sigset_t new_mask;
+      sigfillset(&new_mask);
+      blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0);
+    }
+  }
+
+  // Restore the previous signal mask.
+  void unblock()
+  {
+    if (blocked_)
+      blocked_ = (pthread_sigmask(SIG_SETMASK, &old_mask_, 0) != 0);
+  }
+
+private:
+  // Have signals been blocked.
+  bool blocked_;
+
+  // The previous signal mask.
+  sigset_t old_mask_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
diff --git a/ext/asio/detail/posix_thread.hpp b/ext/asio/detail/posix_thread.hpp
new file mode 100644
index 0000000000..e0fea75129
--- /dev/null
+++ b/ext/asio/detail/posix_thread.hpp
@@ -0,0 +1,129 @@
+//
+// posix_thread.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_POSIX_THREAD_HPP
+#define ASIO_DETAIL_POSIX_THREAD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/push_options.hpp"
+#include <memory>
+#include <boost/throw_exception.hpp>
+#include <pthread.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+extern "C" void* asio_detail_posix_thread_function(void* arg);
+
+class posix_thread
+  : private noncopyable
+{
+public:
+  // Constructor.
+  template <typename Function>
+  posix_thread(Function f)
+    : joined_(false)
+  {
+    std::auto_ptr<func_base> arg(new func<Function>(f));
+    int error = ::pthread_create(&thread_, 0,
+          asio_detail_posix_thread_function, arg.get());
+    if (error != 0)
+    {
+      asio::system_error e(
+          asio::error_code(error,
+            asio::error::get_system_category()),
+          "thread");
+      boost::throw_exception(e);
+    }
+    arg.release();
+  }
+
+  // Destructor.
+  ~posix_thread()
+  {
+    if (!joined_)
+      ::pthread_detach(thread_);
+  }
+
+  // Wait for the thread to exit.
+  void join()
+  {
+    if (!joined_)
+    {
+      ::pthread_join(thread_, 0);
+      joined_ = true;
+    }
+  }
+
+private:
+  friend void* asio_detail_posix_thread_function(void* arg);
+
+  class func_base
+  {
+  public:
+    virtual ~func_base() {}
+    virtual void run() = 0;
+  };
+
+  template <typename Function>
+  class func
+    : public func_base
+  {
+  public:
+    func(Function f)
+      : f_(f)
+    {
+    }
+
+    virtual void run()
+    {
+      f_();
+    }
+
+  private:
+    Function f_;
+  };
+
+  ::pthread_t thread_;
+  bool joined_;
+};
+
+inline void* asio_detail_posix_thread_function(void* arg)
+{
+  std::auto_ptr<posix_thread::func_base> f(
+      static_cast<posix_thread::func_base*>(arg));
+  f->run();
+  return 0;
+}
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_POSIX_THREAD_HPP
diff --git a/ext/asio/detail/posix_tss_ptr.hpp b/ext/asio/detail/posix_tss_ptr.hpp
new file mode 100644
index 0000000000..3b4ba07b44
--- /dev/null
+++ b/ext/asio/detail/posix_tss_ptr.hpp
@@ -0,0 +1,88 @@
+//
+// posix_tss_ptr.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_POSIX_TSS_PTR_HPP
+#define ASIO_DETAIL_POSIX_TSS_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include <pthread.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename T>
+class posix_tss_ptr
+  : private noncopyable
+{
+public:
+  // Constructor.
+  posix_tss_ptr()
+  {
+    int error = ::pthread_key_create(&tss_key_, 0);
+    if (error != 0)
+    {
+      asio::system_error e(
+          asio::error_code(error,
+            asio::error::get_system_category()),
+          "tss");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~posix_tss_ptr()
+  {
+    ::pthread_key_delete(tss_key_);
+  }
+
+  // Get the value.
+  operator T*() const
+  {
+    return static_cast<T*>(::pthread_getspecific(tss_key_));
+  }
+
+  // Set the value.
+  void operator=(T* value)
+  {
+    ::pthread_setspecific(tss_key_, value);
+  }
+
+private:
+  // Thread-specific storage to allow unlocked access to determine whether a
+  // thread is a member of the pool.
+  pthread_key_t tss_key_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_HAS_PTHREADS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_POSIX_TSS_PTR_HPP
diff --git a/ext/asio/detail/push_options.hpp b/ext/asio/detail/push_options.hpp
new file mode 100644
index 0000000000..cb0e90242e
--- /dev/null
+++ b/ext/asio/detail/push_options.hpp
@@ -0,0 +1,114 @@
+//
+// push_options.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+// No header guard
+
+#if defined(__COMO__)
+
+// Comeau C++
+
+#elif defined(__DMC__)
+
+// Digital Mars C++
+
+#elif defined(__INTEL_COMPILER) || defined(__ICL) \
+  || defined(__ICC) || defined(__ECC)
+
+// Intel C++
+
+#elif defined(__GNUC__)
+
+// GNU C++
+
+# if defined(__MINGW32__) || defined(__CYGWIN__)
+#  pragma pack (push, 8)
+# endif
+
+#elif defined(__KCC)
+
+// Kai C++
+
+#elif defined(__sgi)
+
+// SGI MIPSpro C++
+
+#elif defined(__DECCXX)
+
+// Compaq Tru64 Unix cxx
+
+#elif defined(__ghs)
+
+// Greenhills C++
+
+#elif defined(__BORLANDC__)
+
+// Borland C++
+
+# pragma option push -a8 -b -Ve- -Vx- -w-inl -vi-
+# pragma nopushoptwarn
+# pragma nopackwarning
+# if !defined(__MT__)
+#  error Multithreaded RTL must be selected.
+# endif // !defined(__MT__)
+
+#elif defined(__MWERKS__)
+
+// Metrowerks CodeWarrior
+
+#elif defined(__SUNPRO_CC)
+
+// Sun Workshop Compiler C++
+
+#elif defined(__HP_aCC)
+
+// HP aCC
+
+#elif defined(__MRC__) || defined(__SC__)
+
+// MPW MrCpp or SCpp
+
+#elif defined(__IBMCPP__)
+
+// IBM Visual Age
+
+#elif defined(_MSC_VER)
+
+// Microsoft Visual C++
+//
+// Must remain the last #elif since some other vendors (Metrowerks, for example)
+// also #define _MSC_VER
+
+# pragma warning (disable:4103)
+# pragma warning (push)
+# pragma warning (disable:4127)
+# pragma warning (disable:4244)
+# pragma warning (disable:4355)
+# pragma warning (disable:4512)
+# pragma warning (disable:4675)
+# if defined(_M_IX86) && defined(_Wp64)
+// The /Wp64 option is broken. If you want to check 64 bit portability, use a
+// 64 bit compiler!
+#  pragma warning (disable:4311)
+#  pragma warning (disable:4312)
+# endif // defined(_M_IX86) && defined(_Wp64)
+# pragma pack (push, 8)
+// Note that if the /Og optimisation flag is enabled with MSVC6, the compiler
+// has a tendency to incorrectly optimise away some calls to member template
+// functions, even though those functions contain code that should not be
+// optimised away! Therefore we will always disable this optimisation option
+// for the MSVC6 compiler.
+# if (_MSC_VER < 1300)
+#  pragma optimize ("g", off)
+# endif
+# if !defined(_MT)
+#  error Multithreaded RTL must be selected.
+# endif // !defined(_MT)
+
+#endif
diff --git a/ext/asio/detail/reactive_descriptor_service.hpp b/ext/asio/detail/reactive_descriptor_service.hpp
new file mode 100644
index 0000000000..7ad368d7de
--- /dev/null
+++ b/ext/asio/detail/reactive_descriptor_service.hpp
@@ -0,0 +1,668 @@
+//
+// reactive_descriptor_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP
+#define ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/descriptor_ops.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/null_buffers_op.hpp"
+#include "asio/detail/reactor.hpp"
+#include "asio/detail/reactor_op.hpp"
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+namespace asio {
+namespace detail {
+
+class reactive_descriptor_service
+{
+public:
+  // The native type of a descriptor.
+  typedef int native_type;
+
+  // The implementation type of the descriptor.
+  class implementation_type
+    : private asio::detail::noncopyable
+  {
+  public:
+    // Default constructor.
+    implementation_type()
+      : descriptor_(-1),
+        flags_(0)
+    {
+    }
+
+  private:
+    // Only this service will have access to the internal values.
+    friend class reactive_descriptor_service;
+
+    // The native descriptor representation.
+    int descriptor_;
+
+    enum
+    {
+      // The user wants a non-blocking descriptor.
+      user_set_non_blocking = 1,
+
+      // The descriptor has been set non-blocking.
+      internal_non_blocking = 2,
+
+      // Helper "flag" used to determine whether the descriptor is non-blocking.
+      non_blocking = user_set_non_blocking | internal_non_blocking
+    };
+
+    // Flags indicating the current state of the descriptor.
+    unsigned char flags_;
+
+    // Per-descriptor data used by the reactor.
+    reactor::per_descriptor_data reactor_data_;
+  };
+
+  // The maximum number of buffers to support in a single operation.
+  enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len };
+
+  // Constructor.
+  reactive_descriptor_service(asio::io_service& io_service)
+    : io_service_impl_(asio::use_service<io_service_impl>(io_service)),
+      reactor_(asio::use_service<reactor>(io_service))
+  {
+    reactor_.init_task();
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  // Construct a new descriptor implementation.
+  void construct(implementation_type& impl)
+  {
+    impl.descriptor_ = -1;
+    impl.flags_ = 0;
+  }
+
+  // Destroy a descriptor implementation.
+  void destroy(implementation_type& impl)
+  {
+    if (impl.descriptor_ != -1)
+    {
+      reactor_.close_descriptor(impl.descriptor_, impl.reactor_data_);
+
+      if (impl.flags_ & implementation_type::internal_non_blocking)
+      {
+        ioctl_arg_type non_blocking = 0;
+        asio::error_code ignored_ec;
+        descriptor_ops::ioctl(impl.descriptor_,
+            FIONBIO, &non_blocking, ignored_ec);
+        impl.flags_ &= ~implementation_type::internal_non_blocking;
+      }
+
+      asio::error_code ignored_ec;
+      descriptor_ops::close(impl.descriptor_, ignored_ec);
+
+      impl.descriptor_ = -1;
+    }
+  }
+
+  // Assign a native descriptor to a descriptor implementation.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_descriptor, asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    if (int err = reactor_.register_descriptor(
+          native_descriptor, impl.reactor_data_))
+    {
+      ec = asio::error_code(err,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    impl.descriptor_ = native_descriptor;
+    impl.flags_ = 0;
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Determine whether the descriptor is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return impl.descriptor_ != -1;
+  }
+
+  // Destroy a descriptor implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      reactor_.close_descriptor(impl.descriptor_, impl.reactor_data_);
+
+      if (impl.flags_ & implementation_type::internal_non_blocking)
+      {
+        ioctl_arg_type non_blocking = 0;
+        asio::error_code ignored_ec;
+        descriptor_ops::ioctl(impl.descriptor_,
+            FIONBIO, &non_blocking, ignored_ec);
+        impl.flags_ &= ~implementation_type::internal_non_blocking;
+      }
+
+      if (descriptor_ops::close(impl.descriptor_, ec) == -1)
+        return ec;
+
+      impl.descriptor_ = -1;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Get the native descriptor representation.
+  native_type native(const implementation_type& impl) const
+  {
+    return impl.descriptor_;
+  }
+
+  // Cancel all operations associated with the descriptor.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    reactor_.cancel_ops(impl.descriptor_, impl.reactor_data_);
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Perform an IO control command on the descriptor.
+  template <typename IO_Control_Command>
+  asio::error_code io_control(implementation_type& impl,
+      IO_Control_Command& command, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    descriptor_ops::ioctl(impl.descriptor_, command.name(),
+        static_cast<ioctl_arg_type*>(command.data()), ec);
+
+    // When updating the non-blocking mode we always perform the ioctl syscall,
+    // even if the flags would otherwise indicate that the descriptor is
+    // already in the correct state. This ensures that the underlying
+    // descriptor is put into the state that has been requested by the user. If
+    // the ioctl syscall was successful then we need to update the flags to
+    // match.
+    if (!ec && command.name() == static_cast<int>(FIONBIO))
+    {
+      if (*static_cast<ioctl_arg_type*>(command.data()))
+      {
+        impl.flags_ |= implementation_type::user_set_non_blocking;
+      }
+      else
+      {
+        // Clearing the non-blocking mode always overrides any internally-set
+        // non-blocking flag. Any subsequent asynchronous operations will need
+        // to re-enable non-blocking I/O.
+        impl.flags_ &= ~(implementation_type::user_set_non_blocking
+            | implementation_type::internal_non_blocking);
+      }
+    }
+
+    return ec;
+  }
+
+  // Write some data to the descriptor.
+  template <typename ConstBufferSequence>
+  size_t write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    // A request to read_some 0 bytes on a stream is a no-op.
+    if (bufs.all_empty())
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    // Send the data.
+    for (;;)
+    {
+      // Try to complete the operation without blocking.
+      int bytes_sent = descriptor_ops::gather_write(
+          impl.descriptor_, bufs.buffers(), bufs.count(), ec);
+
+      // Check if operation succeeded.
+      if (bytes_sent >= 0)
+        return bytes_sent;
+
+      // Operation failed.
+      if ((impl.flags_ & implementation_type::user_set_non_blocking)
+          || (ec != asio::error::would_block
+            && ec != asio::error::try_again))
+        return 0;
+
+      // Wait for descriptor to become ready.
+      if (descriptor_ops::poll_write(impl.descriptor_, ec) < 0)
+        return 0;
+    }
+  }
+
+  // Wait until data can be written without blocking.
+  size_t write_some(implementation_type& impl,
+      const null_buffers&, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for descriptor to become ready.
+    descriptor_ops::poll_write(impl.descriptor_, ec);
+
+    return 0;
+  }
+
+  template <typename ConstBufferSequence>
+  class write_op_base : public reactor_op
+  {
+  public:
+    write_op_base(int descriptor,
+        const ConstBufferSequence& buffers, func_type complete_func)
+      : reactor_op(&write_op_base::do_perform, complete_func),
+        descriptor_(descriptor),
+        buffers_(buffers)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      write_op_base* o(static_cast<write_op_base*>(base));
+
+      buffer_sequence_adapter<asio::const_buffer,
+          ConstBufferSequence> bufs(o->buffers_);
+
+      for (;;)
+      {
+        // Write the data.
+        asio::error_code ec;
+        int bytes = descriptor_ops::gather_write(
+            o->descriptor_, bufs.buffers(), bufs.count(), ec);
+
+        // Retry operation if interrupted by signal.
+        if (ec == asio::error::interrupted)
+          continue;
+
+        // Check if we need to run the operation again.
+        if (ec == asio::error::would_block
+            || ec == asio::error::try_again)
+          return false;
+
+        o->ec_ = ec;
+        o->bytes_transferred_ = (bytes < 0 ? 0 : bytes);
+        return true;
+      }
+    }
+
+  private:
+    int descriptor_;
+    ConstBufferSequence buffers_;
+  };
+
+  template <typename ConstBufferSequence, typename Handler>
+  class write_op : public write_op_base<ConstBufferSequence>
+  {
+  public:
+    write_op(int descriptor,
+        const ConstBufferSequence& buffers, Handler handler)
+      : write_op_base<ConstBufferSequence>(
+          descriptor, buffers, &write_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      write_op* o(static_cast<write_op*>(base));
+      typedef handler_alloc_traits<Handler, write_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, o->ec_, o->bytes_transferred_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous write. The data being sent must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef write_op<ConstBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, impl.descriptor_, buffers, handler);
+
+    start_op(impl, reactor::write_op, ptr.get(), true,
+        buffer_sequence_adapter<asio::const_buffer,
+          ConstBufferSequence>::all_empty(buffers));
+    ptr.release();
+  }
+
+  // Start an asynchronous wait until data can be written without blocking.
+  template <typename Handler>
+  void async_write_some(implementation_type& impl,
+      const null_buffers&, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    start_op(impl, reactor::write_op, ptr.get(), false, false);
+    ptr.release();
+  }
+
+  // Read some data from the stream. Returns the number of bytes read.
+  template <typename MutableBufferSequence>
+  size_t read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    // A request to read_some 0 bytes on a stream is a no-op.
+    if (bufs.all_empty())
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    // Read some data.
+    for (;;)
+    {
+      // Try to complete the operation without blocking.
+      int bytes_read = descriptor_ops::scatter_read(
+          impl.descriptor_, bufs.buffers(), bufs.count(), ec);
+
+      // Check if operation succeeded.
+      if (bytes_read > 0)
+        return bytes_read;
+
+      // Check for EOF.
+      if (bytes_read == 0)
+      {
+        ec = asio::error::eof;
+        return 0;
+      }
+
+      // Operation failed.
+      if ((impl.flags_ & implementation_type::user_set_non_blocking)
+          || (ec != asio::error::would_block
+            && ec != asio::error::try_again))
+        return 0;
+
+      // Wait for descriptor to become ready.
+      if (descriptor_ops::poll_read(impl.descriptor_, ec) < 0)
+        return 0;
+    }
+  }
+
+  // Wait until data can be read without blocking.
+  size_t read_some(implementation_type& impl,
+      const null_buffers&, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for descriptor to become ready.
+    descriptor_ops::poll_read(impl.descriptor_, ec);
+
+    return 0;
+  }
+
+  template <typename MutableBufferSequence>
+  class read_op_base : public reactor_op
+  {
+  public:
+    read_op_base(int descriptor,
+        const MutableBufferSequence& buffers, func_type complete_func)
+      : reactor_op(&read_op_base::do_perform, complete_func),
+        descriptor_(descriptor),
+        buffers_(buffers)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      read_op_base* o(static_cast<read_op_base*>(base));
+
+      buffer_sequence_adapter<asio::mutable_buffer,
+          MutableBufferSequence> bufs(o->buffers_);
+
+      for (;;)
+      {
+        // Read some data.
+        asio::error_code ec;
+        int bytes = descriptor_ops::scatter_read(
+            o->descriptor_, bufs.buffers(), bufs.count(), ec);
+        if (bytes == 0)
+          ec = asio::error::eof;
+
+        // Retry operation if interrupted by signal.
+        if (ec == asio::error::interrupted)
+          continue;
+
+        // Check if we need to run the operation again.
+        if (ec == asio::error::would_block
+            || ec == asio::error::try_again)
+          return false;
+
+        o->ec_ = ec;
+        o->bytes_transferred_ = (bytes < 0 ? 0 : bytes);
+        return true;
+      }
+    }
+
+  private:
+    int descriptor_;
+    MutableBufferSequence buffers_;
+  };
+
+  template <typename MutableBufferSequence, typename Handler>
+  class read_op : public read_op_base<MutableBufferSequence>
+  {
+  public:
+    read_op(int descriptor,
+        const MutableBufferSequence& buffers, Handler handler)
+      : read_op_base<MutableBufferSequence>(
+          descriptor, buffers, &read_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      read_op* o(static_cast<read_op*>(base));
+      typedef handler_alloc_traits<Handler, read_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, o->ec_, o->bytes_transferred_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous read. The buffer for the data being read must be
+  // valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef read_op<MutableBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr,
+        impl.descriptor_, buffers, handler);
+
+    start_op(impl, reactor::read_op, ptr.get(), true,
+        buffer_sequence_adapter<asio::mutable_buffer,
+          MutableBufferSequence>::all_empty(buffers));
+    ptr.release();
+  }
+
+  // Wait until data can be read without blocking.
+  template <typename Handler>
+  void async_read_some(implementation_type& impl,
+      const null_buffers&, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    start_op(impl, reactor::read_op, ptr.get(), false, false);
+    ptr.release();
+  }
+
+private:
+  // Start the asynchronous operation.
+  void start_op(implementation_type& impl, int op_type,
+      reactor_op* op, bool non_blocking, bool noop)
+  {
+    if (!noop)
+    {
+      if (is_open(impl))
+      {
+        if (is_non_blocking(impl) || set_non_blocking(impl, op->ec_))
+        {
+          reactor_.start_op(op_type, impl.descriptor_,
+              impl.reactor_data_, op, non_blocking);
+          return;
+        }
+      }
+      else
+        op->ec_ = asio::error::bad_descriptor;
+    }
+
+    io_service_impl_.post_immediate_completion(op);
+  }
+
+  // Determine whether the descriptor has been set non-blocking.
+  bool is_non_blocking(implementation_type& impl) const
+  {
+    return (impl.flags_ & implementation_type::non_blocking);
+  }
+
+  // Set the internal non-blocking flag.
+  bool set_non_blocking(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    ioctl_arg_type non_blocking = 1;
+    if (descriptor_ops::ioctl(impl.descriptor_, FIONBIO, &non_blocking, ec))
+      return false;
+    impl.flags_ |= implementation_type::internal_non_blocking;
+    return true;
+  }
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_impl_;
+
+  // The selector that performs event demultiplexing for the service.
+  reactor& reactor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP
diff --git a/ext/asio/detail/reactive_serial_port_service.hpp b/ext/asio/detail/reactive_serial_port_service.hpp
new file mode 100644
index 0000000000..186460fef6
--- /dev/null
+++ b/ext/asio/detail/reactive_serial_port_service.hpp
@@ -0,0 +1,261 @@
+//
+// reactive_serial_port_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_REACTIVE_SERIAL_PORT_SERVICE_HPP
+#define ASIO_DETAIL_REACTIVE_SERIAL_PORT_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstring>
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/serial_port_base.hpp"
+
+#if defined(ASIO_HAS_SERIAL_PORT) \
+  && !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/descriptor_ops.hpp"
+#include "asio/detail/reactive_descriptor_service.hpp"
+
+namespace asio {
+namespace detail {
+
+// Extend reactive_descriptor_service to provide serial port support.
+class reactive_serial_port_service
+{
+public:
+  // The native type of a serial port.
+  typedef reactive_descriptor_service::native_type native_type;
+
+  // The implementation type of the serial port.
+  typedef reactive_descriptor_service::implementation_type implementation_type;
+
+  reactive_serial_port_service(asio::io_service& io_service)
+    : descriptor_service_(io_service)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    descriptor_service_.shutdown_service();
+  }
+
+  // Construct a new handle implementation.
+  void construct(implementation_type& impl)
+  {
+    descriptor_service_.construct(impl);
+  }
+
+  // Destroy a handle implementation.
+  void destroy(implementation_type& impl)
+  {
+    descriptor_service_.destroy(impl);
+  }
+
+  // Open the serial port using the specified device name.
+  asio::error_code open(implementation_type& impl,
+      const std::string& device, asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    int fd = descriptor_ops::open(device.c_str(),
+        O_RDWR | O_NONBLOCK | O_NOCTTY, ec);
+    if (fd < 0)
+      return ec;
+
+    int s = descriptor_ops::fcntl(fd, F_GETFL, ec);
+    if (s >= 0)
+      s = descriptor_ops::fcntl(fd, F_SETFL, s | O_NONBLOCK, ec);
+    if (s < 0)
+    {
+      asio::error_code ignored_ec;
+      descriptor_ops::close(fd, ignored_ec);
+      return ec;
+    }
+  
+    // Set up default serial port options.
+    termios ios;
+    descriptor_ops::clear_error(ec);
+    s = descriptor_ops::error_wrapper(::tcgetattr(fd, &ios), ec);
+    if (s >= 0)
+    {
+#if defined(_BSD_SOURCE)
+      ::cfmakeraw(&ios);
+#else
+      ios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK
+          | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+      ios.c_oflag &= ~OPOST;
+      ios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+      ios.c_cflag &= ~(CSIZE | PARENB);
+      ios.c_cflag |= CS8;
+#endif
+      ios.c_iflag |= IGNPAR;
+      ios.c_cflag |= CREAD | CLOCAL;
+      descriptor_ops::clear_error(ec);
+      s = descriptor_ops::error_wrapper(::tcsetattr(fd, TCSANOW, &ios), ec);
+    }
+    if (s < 0)
+    {
+      asio::error_code ignored_ec;
+      descriptor_ops::close(fd, ignored_ec);
+      return ec;
+    }
+  
+    // We're done. Take ownership of the serial port descriptor.
+    if (descriptor_service_.assign(impl, fd, ec))
+    {
+      asio::error_code ignored_ec;
+      descriptor_ops::close(fd, ignored_ec);
+    }
+
+    return ec;
+  }
+
+  // Assign a native handle to a handle implementation.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_descriptor, asio::error_code& ec)
+  {
+    return descriptor_service_.assign(impl, native_descriptor, ec);
+  }
+
+  // Determine whether the handle is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return descriptor_service_.is_open(impl);
+  }
+
+  // Destroy a handle implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return descriptor_service_.close(impl, ec);
+  }
+
+  // Get the native handle representation.
+  native_type native(implementation_type& impl)
+  {
+    return descriptor_service_.native(impl);
+  }
+
+  // Cancel all operations associated with the handle.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return descriptor_service_.cancel(impl, ec);
+  }
+
+  // Set an option on the serial port.
+  template <typename SettableSerialPortOption>
+  asio::error_code set_option(implementation_type& impl,
+      const SettableSerialPortOption& option, asio::error_code& ec)
+  {
+    termios ios;
+    descriptor_ops::clear_error(ec);
+    descriptor_ops::error_wrapper(::tcgetattr(
+          descriptor_service_.native(impl), &ios), ec);
+    if (ec)
+      return ec;
+
+    if (option.store(ios, ec))
+      return ec;
+
+    descriptor_ops::clear_error(ec);
+    descriptor_ops::error_wrapper(::tcsetattr(
+          descriptor_service_.native(impl), TCSANOW, &ios), ec);
+    return ec;
+  }
+
+  // Get an option from the serial port.
+  template <typename GettableSerialPortOption>
+  asio::error_code get_option(const implementation_type& impl,
+      GettableSerialPortOption& option, asio::error_code& ec) const
+  {
+    termios ios;
+    descriptor_ops::clear_error(ec);
+    descriptor_ops::error_wrapper(::tcgetattr(
+          descriptor_service_.native(impl), &ios), ec);
+    if (ec)
+      return ec;
+
+    return option.load(ios, ec);
+  }
+
+  // Send a break sequence to the serial port.
+  asio::error_code send_break(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    descriptor_ops::clear_error(ec);
+    descriptor_ops::error_wrapper(::tcsendbreak(
+          descriptor_service_.native(impl), 0), ec);
+    return ec;
+  }
+
+  // Write the given data. Returns the number of bytes sent.
+  template <typename ConstBufferSequence>
+  size_t write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return descriptor_service_.write_some(impl, buffers, ec);
+  }
+
+  // Start an asynchronous write. The data being written must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, Handler handler)
+  {
+    descriptor_service_.async_write_some(impl, buffers, handler);
+  }
+
+  // Read some data. Returns the number of bytes received.
+  template <typename MutableBufferSequence>
+  size_t read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return descriptor_service_.read_some(impl, buffers, ec);
+  }
+
+  // Start an asynchronous read. The buffer for the data being received must be
+  // valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, Handler handler)
+  {
+    descriptor_service_.async_read_some(impl, buffers, handler);
+  }
+
+private:
+  // The implementation used for initiating asynchronous operations.
+  reactive_descriptor_service descriptor_service_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_SERIAL_PORT)
+       //   && !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTIVE_SERIAL_PORT_SERVICE_HPP
diff --git a/ext/asio/detail/reactive_socket_service.hpp b/ext/asio/detail/reactive_socket_service.hpp
new file mode 100644
index 0000000000..20bd512ef6
--- /dev/null
+++ b/ext/asio/detail/reactive_socket_service.hpp
@@ -0,0 +1,1744 @@
+//
+// reactive_socket_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_HPP
+#define ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/socket_base.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/null_buffers_op.hpp"
+#include "asio/detail/reactor.hpp"
+#include "asio/detail/reactor_op.hpp"
+#include "asio/detail/socket_holder.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class reactive_socket_service
+{
+public:
+  // The protocol type.
+  typedef Protocol protocol_type;
+
+  // The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  // The native type of a socket.
+  typedef socket_type native_type;
+
+  // The implementation type of the socket.
+  class implementation_type
+    : private asio::detail::noncopyable
+  {
+  public:
+    // Default constructor.
+    implementation_type()
+      : socket_(invalid_socket),
+        flags_(0),
+        protocol_(endpoint_type().protocol())
+    {
+    }
+
+  private:
+    // Only this service will have access to the internal values.
+    friend class reactive_socket_service<Protocol>;
+
+    // The native socket representation.
+    socket_type socket_;
+
+    enum
+    {
+      // The user wants a non-blocking socket.
+      user_set_non_blocking = 1,
+
+      // The implementation wants a non-blocking socket (in order to be able to
+      // perform asynchronous read and write operations).
+      internal_non_blocking = 2,
+
+      // Helper "flag" used to determine whether the socket is non-blocking.
+      non_blocking = user_set_non_blocking | internal_non_blocking,
+
+      // User wants connection_aborted errors, which are disabled by default.
+      enable_connection_aborted = 4,
+
+      // The user set the linger option. Needs to be checked when closing.
+      user_set_linger = 8
+    };
+
+    // Flags indicating the current state of the socket.
+    unsigned char flags_;
+
+    // The protocol associated with the socket.
+    protocol_type protocol_;
+
+    // Per-descriptor data used by the reactor.
+    reactor::per_descriptor_data reactor_data_;
+  };
+
+  // Constructor.
+  reactive_socket_service(asio::io_service& io_service)
+    : io_service_impl_(use_service<io_service_impl>(io_service)),
+      reactor_(use_service<reactor>(io_service))
+  {
+    reactor_.init_task();
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  // Construct a new socket implementation.
+  void construct(implementation_type& impl)
+  {
+    impl.socket_ = invalid_socket;
+    impl.flags_ = 0;
+  }
+
+  // Destroy a socket implementation.
+  void destroy(implementation_type& impl)
+  {
+    if (impl.socket_ != invalid_socket)
+    {
+      reactor_.close_descriptor(impl.socket_, impl.reactor_data_);
+
+      if (impl.flags_ & implementation_type::non_blocking)
+      {
+        ioctl_arg_type non_blocking = 0;
+        asio::error_code ignored_ec;
+        socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ignored_ec);
+        impl.flags_ &= ~implementation_type::non_blocking;
+      }
+
+      if (impl.flags_ & implementation_type::user_set_linger)
+      {
+        ::linger opt;
+        opt.l_onoff = 0;
+        opt.l_linger = 0;
+        asio::error_code ignored_ec;
+        socket_ops::setsockopt(impl.socket_,
+            SOL_SOCKET, SO_LINGER, &opt, sizeof(opt), ignored_ec);
+      }
+
+      asio::error_code ignored_ec;
+      socket_ops::close(impl.socket_, ignored_ec);
+
+      impl.socket_ = invalid_socket;
+    }
+  }
+
+  // Open a new socket implementation.
+  asio::error_code open(implementation_type& impl,
+      const protocol_type& protocol, asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    socket_holder sock(socket_ops::socket(protocol.family(),
+          protocol.type(), protocol.protocol(), ec));
+    if (sock.get() == invalid_socket)
+      return ec;
+
+    if (int err = reactor_.register_descriptor(sock.get(), impl.reactor_data_))
+    {
+      ec = asio::error_code(err,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    impl.socket_ = sock.release();
+    impl.flags_ = 0;
+    impl.protocol_ = protocol;
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Assign a native socket to a socket implementation.
+  asio::error_code assign(implementation_type& impl,
+      const protocol_type& protocol, const native_type& native_socket,
+      asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    if (int err = reactor_.register_descriptor(
+          native_socket, impl.reactor_data_))
+    {
+      ec = asio::error_code(err,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    impl.socket_ = native_socket;
+    impl.flags_ = 0;
+    impl.protocol_ = protocol;
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Determine whether the socket is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return impl.socket_ != invalid_socket;
+  }
+
+  // Destroy a socket implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      reactor_.close_descriptor(impl.socket_, impl.reactor_data_);
+
+      if (impl.flags_ & implementation_type::non_blocking)
+      {
+        ioctl_arg_type non_blocking = 0;
+        asio::error_code ignored_ec;
+        socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ignored_ec);
+        impl.flags_ &= ~implementation_type::non_blocking;
+      }
+
+      if (socket_ops::close(impl.socket_, ec) == socket_error_retval)
+        return ec;
+
+      impl.socket_ = invalid_socket;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Get the native socket representation.
+  native_type native(implementation_type& impl)
+  {
+    return impl.socket_;
+  }
+
+  // Cancel all operations associated with the socket.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    reactor_.cancel_ops(impl.socket_, impl.reactor_data_);
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Determine whether the socket is at the out-of-band data mark.
+  bool at_mark(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return false;
+    }
+
+#if defined(SIOCATMARK)
+    asio::detail::ioctl_arg_type value = 0;
+    socket_ops::ioctl(impl.socket_, SIOCATMARK, &value, ec);
+# if defined(ENOTTY)
+    if (ec.value() == ENOTTY)
+      ec = asio::error::not_socket;
+# endif // defined(ENOTTY)
+#else // defined(SIOCATMARK)
+    int value = sockatmark(impl.socket_);
+    if (value == -1)
+      ec = asio::error_code(errno,
+          asio::error::get_system_category());
+    else
+      ec = asio::error_code();
+#endif // defined(SIOCATMARK)
+    return ec ? false : value != 0;
+  }
+
+  // Determine the number of bytes available for reading.
+  std::size_t available(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    asio::detail::ioctl_arg_type value = 0;
+    socket_ops::ioctl(impl.socket_, FIONREAD, &value, ec);
+#if defined(ENOTTY)
+    if (ec.value() == ENOTTY)
+      ec = asio::error::not_socket;
+#endif // defined(ENOTTY)
+    return ec ? static_cast<std::size_t>(0) : static_cast<std::size_t>(value);
+  }
+
+  // Bind the socket to the specified local endpoint.
+  asio::error_code bind(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::bind(impl.socket_, endpoint.data(), endpoint.size(), ec);
+    return ec;
+  }
+
+  // Place the socket into the state where it will listen for new connections.
+  asio::error_code listen(implementation_type& impl, int backlog,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::listen(impl.socket_, backlog, ec);
+    return ec;
+  }
+
+  // Set a socket option.
+  template <typename Option>
+  asio::error_code set_option(implementation_type& impl,
+      const Option& option, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    if (option.level(impl.protocol_) == custom_socket_option_level
+        && option.name(impl.protocol_) == enable_connection_aborted_option)
+    {
+      if (option.size(impl.protocol_) != sizeof(int))
+      {
+        ec = asio::error::invalid_argument;
+      }
+      else
+      {
+        if (*reinterpret_cast<const int*>(option.data(impl.protocol_)))
+          impl.flags_ |= implementation_type::enable_connection_aborted;
+        else
+          impl.flags_ &= ~implementation_type::enable_connection_aborted;
+        ec = asio::error_code();
+      }
+      return ec;
+    }
+    else
+    {
+      if (option.level(impl.protocol_) == SOL_SOCKET
+          && option.name(impl.protocol_) == SO_LINGER)
+      {
+        impl.flags_ |= implementation_type::user_set_linger;
+      }
+
+      socket_ops::setsockopt(impl.socket_,
+          option.level(impl.protocol_), option.name(impl.protocol_),
+          option.data(impl.protocol_), option.size(impl.protocol_), ec);
+
+#if defined(__MACH__) && defined(__APPLE__) \
+|| defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+      // To implement portable behaviour for SO_REUSEADDR with UDP sockets we
+      // need to also set SO_REUSEPORT on BSD-based platforms.
+      if (!ec && impl.protocol_.type() == SOCK_DGRAM
+          && option.level(impl.protocol_) == SOL_SOCKET
+          && option.name(impl.protocol_) == SO_REUSEADDR)
+      {
+        asio::error_code ignored_ec;
+        socket_ops::setsockopt(impl.socket_, SOL_SOCKET, SO_REUSEPORT,
+            option.data(impl.protocol_), option.size(impl.protocol_),
+            ignored_ec);
+      }
+#endif
+
+      return ec;
+    }
+  }
+
+  // Set a socket option.
+  template <typename Option>
+  asio::error_code get_option(const implementation_type& impl,
+      Option& option, asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    if (option.level(impl.protocol_) == custom_socket_option_level
+        && option.name(impl.protocol_) == enable_connection_aborted_option)
+    {
+      if (option.size(impl.protocol_) != sizeof(int))
+      {
+        ec = asio::error::invalid_argument;
+      }
+      else
+      {
+        int* target = reinterpret_cast<int*>(option.data(impl.protocol_));
+        if (impl.flags_ & implementation_type::enable_connection_aborted)
+          *target = 1;
+        else
+          *target = 0;
+        option.resize(impl.protocol_, sizeof(int));
+        ec = asio::error_code();
+      }
+      return ec;
+    }
+    else
+    {
+      size_t size = option.size(impl.protocol_);
+      socket_ops::getsockopt(impl.socket_,
+          option.level(impl.protocol_), option.name(impl.protocol_),
+          option.data(impl.protocol_), &size, ec);
+      if (!ec)
+        option.resize(impl.protocol_, size);
+      return ec;
+    }
+  }
+
+  // Perform an IO control command on the socket.
+  template <typename IO_Control_Command>
+  asio::error_code io_control(implementation_type& impl,
+      IO_Control_Command& command, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::ioctl(impl.socket_, command.name(),
+        static_cast<ioctl_arg_type*>(command.data()), ec);
+
+    // When updating the non-blocking mode we always perform the ioctl
+    // syscall, even if the flags would otherwise indicate that the socket is
+    // already in the correct state. This ensures that the underlying socket
+    // is put into the state that has been requested by the user. If the ioctl
+    // syscall was successful then we need to update the flags to match.
+    if (!ec && command.name() == static_cast<int>(FIONBIO))
+    {
+      if (*static_cast<ioctl_arg_type*>(command.data()))
+      {
+        impl.flags_ |= implementation_type::user_set_non_blocking;
+      }
+      else
+      {
+        // Clearing the non-blocking mode always overrides any internally-set
+        // non-blocking flag. Any subsequent asynchronous operations will need
+        // to re-enable non-blocking I/O.
+        impl.flags_ &= ~(implementation_type::user_set_non_blocking
+            | implementation_type::internal_non_blocking);
+      }
+    }
+
+    return ec;
+  }
+
+  // Get the local endpoint.
+  endpoint_type local_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return endpoint_type();
+    }
+
+    endpoint_type endpoint;
+    std::size_t addr_len = endpoint.capacity();
+    if (socket_ops::getsockname(impl.socket_, endpoint.data(), &addr_len, ec))
+      return endpoint_type();
+    endpoint.resize(addr_len);
+    return endpoint;
+  }
+
+  // Get the remote endpoint.
+  endpoint_type remote_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return endpoint_type();
+    }
+
+    endpoint_type endpoint;
+    std::size_t addr_len = endpoint.capacity();
+    if (socket_ops::getpeername(impl.socket_, endpoint.data(), &addr_len, ec))
+      return endpoint_type();
+    endpoint.resize(addr_len);
+    return endpoint;
+  }
+
+  /// Disable sends or receives on the socket.
+  asio::error_code shutdown(implementation_type& impl,
+      socket_base::shutdown_type what, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::shutdown(impl.socket_, what, ec);
+    return ec;
+  }
+
+  // Send the given data to the peer.
+  template <typename ConstBufferSequence>
+  size_t send(implementation_type& impl, const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    // A request to receive 0 bytes on a stream socket is a no-op.
+    if (impl.protocol_.type() == SOCK_STREAM && bufs.all_empty())
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    // Send the data.
+    for (;;)
+    {
+      // Try to complete the operation without blocking.
+      int bytes_sent = socket_ops::send(impl.socket_,
+          bufs.buffers(), bufs.count(), flags, ec);
+
+      // Check if operation succeeded.
+      if (bytes_sent >= 0)
+        return bytes_sent;
+
+      // Operation failed.
+      if ((impl.flags_ & implementation_type::user_set_non_blocking)
+          || (ec != asio::error::would_block
+            && ec != asio::error::try_again))
+        return 0;
+
+      // Wait for socket to become ready.
+      if (socket_ops::poll_write(impl.socket_, ec) < 0)
+        return 0;
+    }
+  }
+
+  // Wait until data can be sent without blocking.
+  size_t send(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_write(impl.socket_, ec);
+
+    return 0;
+  }
+
+  template <typename ConstBufferSequence>
+  class send_op_base : public reactor_op
+  {
+  public:
+    send_op_base(socket_type socket, const ConstBufferSequence& buffers,
+        socket_base::message_flags flags, func_type complete_func)
+      : reactor_op(&send_op_base::do_perform, complete_func),
+        socket_(socket),
+        buffers_(buffers),
+        flags_(flags)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      send_op_base* o(static_cast<send_op_base*>(base));
+
+      buffer_sequence_adapter<asio::const_buffer,
+          ConstBufferSequence> bufs(o->buffers_);
+
+      for (;;)
+      {
+        // Send the data.
+        asio::error_code ec;
+        int bytes = socket_ops::send(o->socket_,
+            bufs.buffers(), bufs.count(), o->flags_, ec);
+
+        // Retry operation if interrupted by signal.
+        if (ec == asio::error::interrupted)
+          continue;
+
+        // Check if we need to run the operation again.
+        if (ec == asio::error::would_block
+            || ec == asio::error::try_again)
+          return false;
+
+        o->ec_ = ec;
+        o->bytes_transferred_ = (bytes < 0 ? 0 : bytes);
+        return true;
+      }
+    }
+
+  private:
+    socket_type socket_;
+    ConstBufferSequence buffers_;
+    socket_base::message_flags flags_;
+  };
+
+  template <typename ConstBufferSequence, typename Handler>
+  class send_op : public send_op_base<ConstBufferSequence>
+  {
+  public:
+    send_op(socket_type socket, const ConstBufferSequence& buffers,
+        socket_base::message_flags flags, Handler handler)
+      : send_op_base<ConstBufferSequence>(socket,
+          buffers, flags, &send_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      send_op* o(static_cast<send_op*>(base));
+      typedef handler_alloc_traits<Handler, send_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, o->ec_, o->bytes_transferred_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous send. The data being sent must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_send(implementation_type& impl, const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef send_op<ConstBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr,
+        impl.socket_, buffers, flags, handler);
+
+    start_op(impl, reactor::write_op, ptr.get(), true,
+        (impl.protocol_.type() == SOCK_STREAM
+          && buffer_sequence_adapter<asio::const_buffer,
+            ConstBufferSequence>::all_empty(buffers)));
+    ptr.release();
+  }
+
+  // Start an asynchronous wait until data can be sent without blocking.
+  template <typename Handler>
+  void async_send(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    start_op(impl, reactor::write_op, ptr.get(), false, false);
+    ptr.release();
+  }
+
+  // Send a datagram to the specified endpoint. Returns the number of bytes
+  // sent.
+  template <typename ConstBufferSequence>
+  size_t send_to(implementation_type& impl, const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    // Send the data.
+    for (;;)
+    {
+      // Try to complete the operation without blocking.
+      int bytes_sent = socket_ops::sendto(impl.socket_, bufs.buffers(),
+          bufs.count(), flags, destination.data(), destination.size(), ec);
+
+      // Check if operation succeeded.
+      if (bytes_sent >= 0)
+        return bytes_sent;
+
+      // Operation failed.
+      if ((impl.flags_ & implementation_type::user_set_non_blocking)
+          || (ec != asio::error::would_block
+            && ec != asio::error::try_again))
+        return 0;
+
+      // Wait for socket to become ready.
+      if (socket_ops::poll_write(impl.socket_, ec) < 0)
+        return 0;
+    }
+  }
+
+  // Wait until data can be sent without blocking.
+  size_t send_to(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, const endpoint_type&,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_write(impl.socket_, ec);
+
+    return 0;
+  }
+
+  template <typename ConstBufferSequence>
+  class send_to_op_base : public reactor_op
+  {
+  public:
+    send_to_op_base(socket_type socket, const ConstBufferSequence& buffers,
+        const endpoint_type& endpoint, socket_base::message_flags flags,
+        func_type complete_func)
+      : reactor_op(&send_to_op_base::do_perform, complete_func),
+        socket_(socket),
+        buffers_(buffers),
+        destination_(endpoint),
+        flags_(flags)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      send_to_op_base* o(static_cast<send_to_op_base*>(base));
+
+      buffer_sequence_adapter<asio::const_buffer,
+          ConstBufferSequence> bufs(o->buffers_);
+
+      for (;;)
+      {
+        // Send the data.
+        asio::error_code ec;
+        int bytes = socket_ops::sendto(o->socket_, bufs.buffers(), bufs.count(),
+            o->flags_, o->destination_.data(), o->destination_.size(), ec);
+
+        // Retry operation if interrupted by signal.
+        if (ec == asio::error::interrupted)
+          continue;
+
+        // Check if we need to run the operation again.
+        if (ec == asio::error::would_block
+            || ec == asio::error::try_again)
+          return false;
+
+        o->ec_ = ec;
+        o->bytes_transferred_ = (bytes < 0 ? 0 : bytes);
+        return true;
+      }
+    }
+
+  private:
+    socket_type socket_;
+    ConstBufferSequence buffers_;
+    endpoint_type destination_;
+    socket_base::message_flags flags_;
+  };
+
+  template <typename ConstBufferSequence, typename Handler>
+  class send_to_op : public send_to_op_base<ConstBufferSequence>
+  {
+  public:
+    send_to_op(socket_type socket, const ConstBufferSequence& buffers,
+        const endpoint_type& endpoint, socket_base::message_flags flags,
+        Handler handler)
+      : send_to_op_base<ConstBufferSequence>(socket,
+          buffers, endpoint, flags, &send_to_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      send_to_op* o(static_cast<send_to_op*>(base));
+      typedef handler_alloc_traits<Handler, send_to_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, o->ec_, o->bytes_transferred_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous send. The data being sent must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_send_to(implementation_type& impl,
+      const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags,
+      Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef send_to_op<ConstBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, impl.socket_,
+        buffers, destination, flags, handler);
+
+    start_op(impl, reactor::write_op, ptr.get(), true, false);
+    ptr.release();
+  }
+
+  // Start an asynchronous wait until data can be sent without blocking.
+  template <typename Handler>
+  void async_send_to(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, const endpoint_type&, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    start_op(impl, reactor::write_op, ptr.get(), false, false);
+    ptr.release();
+  }
+
+  // Receive some data from the peer. Returns the number of bytes received.
+  template <typename MutableBufferSequence>
+  size_t receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    // A request to receive 0 bytes on a stream socket is a no-op.
+    if (impl.protocol_.type() == SOCK_STREAM && bufs.all_empty())
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    // Receive some data.
+    for (;;)
+    {
+      // Try to complete the operation without blocking.
+      int bytes_recvd = socket_ops::recv(impl.socket_,
+          bufs.buffers(), bufs.count(), flags, ec);
+
+      // Check if operation succeeded.
+      if (bytes_recvd > 0)
+        return bytes_recvd;
+
+      // Check for EOF.
+      if (bytes_recvd == 0 && impl.protocol_.type() == SOCK_STREAM)
+      {
+        ec = asio::error::eof;
+        return 0;
+      }
+
+      // Operation failed.
+      if ((impl.flags_ & implementation_type::user_set_non_blocking)
+          || (ec != asio::error::would_block
+            && ec != asio::error::try_again))
+        return 0;
+
+      // Wait for socket to become ready.
+      if (socket_ops::poll_read(impl.socket_, ec) < 0)
+        return 0;
+    }
+  }
+
+  // Wait until data can be received without blocking.
+  size_t receive(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_read(impl.socket_, ec);
+
+    return 0;
+  }
+
+  template <typename MutableBufferSequence>
+  class receive_op_base : public reactor_op
+  {
+  public:
+    receive_op_base(socket_type socket, int protocol_type,
+        const MutableBufferSequence& buffers,
+        socket_base::message_flags flags, func_type complete_func)
+      : reactor_op(&receive_op_base::do_perform, complete_func),
+        socket_(socket),
+        protocol_type_(protocol_type),
+        buffers_(buffers),
+        flags_(flags)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      receive_op_base* o(static_cast<receive_op_base*>(base));
+
+      buffer_sequence_adapter<asio::mutable_buffer,
+          MutableBufferSequence> bufs(o->buffers_);
+
+      for (;;)
+      {
+        // Receive some data.
+        asio::error_code ec;
+        int bytes = socket_ops::recv(o->socket_,
+            bufs.buffers(), bufs.count(), o->flags_, ec);
+        if (bytes == 0 && o->protocol_type_ == SOCK_STREAM)
+          ec = asio::error::eof;
+
+        // Retry operation if interrupted by signal.
+        if (ec == asio::error::interrupted)
+          continue;
+
+        // Check if we need to run the operation again.
+        if (ec == asio::error::would_block
+            || ec == asio::error::try_again)
+          return false;
+
+        o->ec_ = ec;
+        o->bytes_transferred_ = (bytes < 0 ? 0 : bytes);
+        return true;
+      }
+    }
+
+  private:
+    socket_type socket_;
+    int protocol_type_;
+    MutableBufferSequence buffers_;
+    socket_base::message_flags flags_;
+  };
+
+  template <typename MutableBufferSequence, typename Handler>
+  class receive_op : public receive_op_base<MutableBufferSequence>
+  {
+  public:
+    receive_op(socket_type socket, int protocol_type,
+        const MutableBufferSequence& buffers,
+        socket_base::message_flags flags, Handler handler)
+      : receive_op_base<MutableBufferSequence>(socket,
+          protocol_type, buffers, flags, &receive_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      receive_op* o(static_cast<receive_op*>(base));
+      typedef handler_alloc_traits<Handler, receive_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, o->ec_, o->bytes_transferred_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous receive. The buffer for the data being received
+  // must be valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef receive_op<MutableBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    int protocol_type = impl.protocol_.type();
+    handler_ptr<alloc_traits> ptr(raw_ptr, impl.socket_,
+        protocol_type, buffers, flags, handler);
+
+    start_op(impl,
+        (flags & socket_base::message_out_of_band)
+          ? reactor::except_op : reactor::read_op,
+        ptr.get(), (flags & socket_base::message_out_of_band) == 0,
+        (impl.protocol_.type() == SOCK_STREAM
+          && buffer_sequence_adapter<asio::mutable_buffer,
+            MutableBufferSequence>::all_empty(buffers)));
+    ptr.release();
+  }
+
+  // Wait until data can be received without blocking.
+  template <typename Handler>
+  void async_receive(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    start_op(impl,
+        (flags & socket_base::message_out_of_band)
+          ? reactor::except_op : reactor::read_op,
+        ptr.get(), false, false);
+    ptr.release();
+  }
+
+  // Receive a datagram with the endpoint of the sender. Returns the number of
+  // bytes received.
+  template <typename MutableBufferSequence>
+  size_t receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    // Receive some data.
+    for (;;)
+    {
+      // Try to complete the operation without blocking.
+      std::size_t addr_len = sender_endpoint.capacity();
+      int bytes_recvd = socket_ops::recvfrom(impl.socket_, bufs.buffers(),
+          bufs.count(), flags, sender_endpoint.data(), &addr_len, ec);
+
+      // Check if operation succeeded.
+      if (bytes_recvd > 0)
+      {
+        sender_endpoint.resize(addr_len);
+        return bytes_recvd;
+      }
+
+      // Check for EOF.
+      if (bytes_recvd == 0 && impl.protocol_.type() == SOCK_STREAM)
+      {
+        ec = asio::error::eof;
+        return 0;
+      }
+
+      // Operation failed.
+      if ((impl.flags_ & implementation_type::user_set_non_blocking)
+          || (ec != asio::error::would_block
+            && ec != asio::error::try_again))
+        return 0;
+
+      // Wait for socket to become ready.
+      if (socket_ops::poll_read(impl.socket_, ec) < 0)
+        return 0;
+    }
+  }
+
+  // Wait until data can be received without blocking.
+  size_t receive_from(implementation_type& impl, const null_buffers&,
+      endpoint_type& sender_endpoint, socket_base::message_flags,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_read(impl.socket_, ec);
+
+    // Reset endpoint since it can be given no sensible value at this time.
+    sender_endpoint = endpoint_type();
+
+    return 0;
+  }
+
+  template <typename MutableBufferSequence>
+  class receive_from_op_base : public reactor_op
+  {
+  public:
+    receive_from_op_base(socket_type socket, int protocol_type,
+        const MutableBufferSequence& buffers, endpoint_type& endpoint,
+        socket_base::message_flags flags, func_type complete_func)
+      : reactor_op(&receive_from_op_base::do_perform, complete_func),
+        socket_(socket),
+        protocol_type_(protocol_type),
+        buffers_(buffers),
+        sender_endpoint_(endpoint),
+        flags_(flags)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      receive_from_op_base* o(static_cast<receive_from_op_base*>(base));
+
+      buffer_sequence_adapter<asio::mutable_buffer,
+          MutableBufferSequence> bufs(o->buffers_);
+
+      for (;;)
+      {
+        // Receive some data.
+        asio::error_code ec;
+        std::size_t addr_len = o->sender_endpoint_.capacity();
+        int bytes = socket_ops::recvfrom(o->socket_, bufs.buffers(),
+            bufs.count(), o->flags_, o->sender_endpoint_.data(), &addr_len, ec);
+        if (bytes == 0 && o->protocol_type_ == SOCK_STREAM)
+          ec = asio::error::eof;
+
+        // Retry operation if interrupted by signal.
+        if (ec == asio::error::interrupted)
+          continue;
+
+        // Check if we need to run the operation again.
+        if (ec == asio::error::would_block
+            || ec == asio::error::try_again)
+          return false;
+
+        o->sender_endpoint_.resize(addr_len);
+        o->ec_ = ec;
+        o->bytes_transferred_ = (bytes < 0 ? 0 : bytes);
+        return true;
+      }
+    }
+
+  private:
+    socket_type socket_;
+    int protocol_type_;
+    MutableBufferSequence buffers_;
+    endpoint_type& sender_endpoint_;
+    socket_base::message_flags flags_;
+  };
+
+  template <typename MutableBufferSequence, typename Handler>
+  class receive_from_op : public receive_from_op_base<MutableBufferSequence>
+  {
+  public:
+    receive_from_op(socket_type socket, int protocol_type,
+        const MutableBufferSequence& buffers, endpoint_type& endpoint,
+        socket_base::message_flags flags, Handler handler)
+      : receive_from_op_base<MutableBufferSequence>(socket, protocol_type,
+          buffers, endpoint, flags, &receive_from_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      receive_from_op* o(static_cast<receive_from_op*>(base));
+      typedef handler_alloc_traits<Handler, receive_from_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, o->ec_, o->bytes_transferred_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous receive. The buffer for the data being received and
+  // the sender_endpoint object must both be valid for the lifetime of the
+  // asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef receive_from_op<MutableBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    int protocol_type = impl.protocol_.type();
+    handler_ptr<alloc_traits> ptr(raw_ptr, impl.socket_,
+        protocol_type, buffers, sender_endpoint, flags, handler);
+
+    start_op(impl,
+        (flags & socket_base::message_out_of_band)
+          ? reactor::except_op : reactor::read_op,
+        ptr.get(), true, false);
+    ptr.release();
+  }
+
+  // Wait until data can be received without blocking.
+  template <typename Handler>
+  void async_receive_from(implementation_type& impl,
+      const null_buffers&, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    // Reset endpoint since it can be given no sensible value at this time.
+    sender_endpoint = endpoint_type();
+
+    start_op(impl,
+        (flags & socket_base::message_out_of_band)
+          ? reactor::except_op : reactor::read_op,
+        ptr.get(), false, false);
+    ptr.release();
+  }
+
+  // Accept a new connection.
+  template <typename Socket>
+  asio::error_code accept(implementation_type& impl,
+      Socket& peer, endpoint_type* peer_endpoint, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    // We cannot accept a socket that is already open.
+    if (peer.is_open())
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    // Accept a socket.
+    for (;;)
+    {
+      // Try to complete the operation without blocking.
+      socket_holder new_socket;
+      std::size_t addr_len = 0;
+      if (peer_endpoint)
+      {
+        addr_len = peer_endpoint->capacity();
+        new_socket.reset(socket_ops::accept(impl.socket_,
+              peer_endpoint->data(), &addr_len, ec));
+      }
+      else
+      {
+        new_socket.reset(socket_ops::accept(impl.socket_, 0, 0, ec));
+      }
+
+      // Check if operation succeeded.
+      if (new_socket.get() >= 0)
+      {
+        if (peer_endpoint)
+          peer_endpoint->resize(addr_len);
+        peer.assign(impl.protocol_, new_socket.get(), ec);
+        if (!ec)
+          new_socket.release();
+        return ec;
+      }
+
+      // Operation failed.
+      if (ec == asio::error::would_block
+          || ec == asio::error::try_again)
+      {
+        if (impl.flags_ & implementation_type::user_set_non_blocking)
+          return ec;
+        // Fall through to retry operation.
+      }
+      else if (ec == asio::error::connection_aborted)
+      {
+        if (impl.flags_ & implementation_type::enable_connection_aborted)
+          return ec;
+        // Fall through to retry operation.
+      }
+#if defined(EPROTO)
+      else if (ec.value() == EPROTO)
+      {
+        if (impl.flags_ & implementation_type::enable_connection_aborted)
+          return ec;
+        // Fall through to retry operation.
+      }
+#endif // defined(EPROTO)
+      else
+        return ec;
+
+      // Wait for socket to become ready.
+      if (socket_ops::poll_read(impl.socket_, ec) < 0)
+        return ec;
+    }
+  }
+
+  template <typename Socket>
+  class accept_op_base : public reactor_op
+  {
+  public:
+    accept_op_base(socket_type socket, Socket& peer,
+        const protocol_type& protocol, endpoint_type* peer_endpoint,
+        bool enable_connection_aborted, func_type complete_func)
+      : reactor_op(&accept_op_base::do_perform, complete_func),
+        socket_(socket),
+        peer_(peer),
+        protocol_(protocol),
+        peer_endpoint_(peer_endpoint),
+        enable_connection_aborted_(enable_connection_aborted)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      accept_op_base* o(static_cast<accept_op_base*>(base));
+
+      for (;;)
+      {
+        // Accept the waiting connection.
+        asio::error_code ec;
+        socket_holder new_socket;
+        std::size_t addr_len = 0;
+        std::size_t* addr_len_p = 0;
+        socket_addr_type* addr = 0;
+        if (o->peer_endpoint_)
+        {
+          addr_len = o->peer_endpoint_->capacity();
+          addr_len_p = &addr_len;
+          addr = o->peer_endpoint_->data();
+        }
+        new_socket.reset(socket_ops::accept(o->socket_, addr, addr_len_p, ec));
+
+        // Retry operation if interrupted by signal.
+        if (ec == asio::error::interrupted)
+          continue;
+
+        // Check if we need to run the operation again.
+        if (ec == asio::error::would_block
+            || ec == asio::error::try_again)
+          return false;
+        if (ec == asio::error::connection_aborted
+            && !o->enable_connection_aborted_)
+          return false;
+#if defined(EPROTO)
+        if (ec.value() == EPROTO && !o->enable_connection_aborted_)
+          return false;
+#endif // defined(EPROTO)
+
+        // Transfer ownership of the new socket to the peer object.
+        if (!ec)
+        {
+          if (o->peer_endpoint_)
+            o->peer_endpoint_->resize(addr_len);
+          o->peer_.assign(o->protocol_, new_socket.get(), ec);
+          if (!ec)
+            new_socket.release();
+        }
+
+        o->ec_ = ec;
+        return true;
+      }
+    }
+
+  private:
+    socket_type socket_;
+    Socket& peer_;
+    protocol_type protocol_;
+    endpoint_type* peer_endpoint_;
+    bool enable_connection_aborted_;
+  };
+
+  template <typename Socket, typename Handler>
+  class accept_op : public accept_op_base<Socket>
+  {
+  public:
+    accept_op(socket_type socket, Socket& peer, const protocol_type& protocol,
+        endpoint_type* peer_endpoint, bool enable_connection_aborted,
+        Handler handler)
+      : accept_op_base<Socket>(socket, peer, protocol, peer_endpoint,
+          enable_connection_aborted, &accept_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      accept_op* o(static_cast<accept_op*>(base));
+      typedef handler_alloc_traits<Handler, accept_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder1<Handler, asio::error_code>
+          handler(o->handler_, o->ec_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous accept. The peer and peer_endpoint objects
+  // must be valid until the accept's handler is invoked.
+  template <typename Socket, typename Handler>
+  void async_accept(implementation_type& impl, Socket& peer,
+      endpoint_type* peer_endpoint, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef accept_op<Socket, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    bool enable_connection_aborted =
+      (impl.flags_ & implementation_type::enable_connection_aborted) != 0;
+    handler_ptr<alloc_traits> ptr(raw_ptr, impl.socket_, peer,
+        impl.protocol_, peer_endpoint, enable_connection_aborted, handler);
+
+    start_accept_op(impl, ptr.get(), peer.is_open());
+    ptr.release();
+  }
+
+  // Connect the socket to the specified endpoint.
+  asio::error_code connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    // Perform the connect operation.
+    socket_ops::connect(impl.socket_,
+        peer_endpoint.data(), peer_endpoint.size(), ec);
+    if (ec != asio::error::in_progress
+        && ec != asio::error::would_block)
+    {
+      // The connect operation finished immediately.
+      return ec;
+    }
+
+    // Wait for socket to become ready.
+    if (socket_ops::poll_connect(impl.socket_, ec) < 0)
+      return ec;
+
+    // Get the error code from the connect operation.
+    int connect_error = 0;
+    size_t connect_error_len = sizeof(connect_error);
+    if (socket_ops::getsockopt(impl.socket_, SOL_SOCKET, SO_ERROR,
+          &connect_error, &connect_error_len, ec) == socket_error_retval)
+      return ec;
+
+    // Return the result of the connect operation.
+    ec = asio::error_code(connect_error,
+        asio::error::get_system_category());
+    return ec;
+  }
+
+  class connect_op_base : public reactor_op
+  {
+  public:
+    connect_op_base(socket_type socket, func_type complete_func)
+      : reactor_op(&connect_op_base::do_perform, complete_func),
+        socket_(socket)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      connect_op_base* o(static_cast<connect_op_base*>(base));
+
+      // Get the error code from the connect operation.
+      int connect_error = 0;
+      size_t connect_error_len = sizeof(connect_error);
+      if (socket_ops::getsockopt(o->socket_, SOL_SOCKET, SO_ERROR,
+            &connect_error, &connect_error_len, o->ec_) == socket_error_retval)
+        return true;
+
+      // The connection failed so the handler will be posted with an error code.
+      if (connect_error)
+      {
+        o->ec_ = asio::error_code(connect_error,
+            asio::error::get_system_category());
+      }
+
+      return true;
+    }
+
+  private:
+    socket_type socket_;
+  };
+
+  template <typename Handler>
+  class connect_op : public connect_op_base
+  {
+  public:
+    connect_op(socket_type socket, Handler handler)
+      : connect_op_base(socket, &connect_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      connect_op* o(static_cast<connect_op*>(base));
+      typedef handler_alloc_traits<Handler, connect_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder1<Handler, asio::error_code>
+          handler(o->handler_, o->ec_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous connect.
+  template <typename Handler>
+  void async_connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef connect_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, impl.socket_, handler);
+
+    start_connect_op(impl, ptr.get(), peer_endpoint);
+    ptr.release();
+  }
+
+private:
+  // Start the asynchronous read or write operation.
+  void start_op(implementation_type& impl, int op_type,
+      reactor_op* op, bool non_blocking, bool noop)
+  {
+    if (!noop)
+    {
+      if (is_open(impl))
+      {
+        if (!non_blocking || is_non_blocking(impl)
+            || set_non_blocking(impl, op->ec_))
+        {
+          reactor_.start_op(op_type, impl.socket_,
+              impl.reactor_data_, op, non_blocking);
+          return;
+        }
+      }
+      else
+        op->ec_ = asio::error::bad_descriptor;
+    }
+
+    io_service_impl_.post_immediate_completion(op);
+  }
+
+  // Start the asynchronous accept operation.
+  void start_accept_op(implementation_type& impl,
+      reactor_op* op, bool peer_is_open)
+  {
+    if (!peer_is_open)
+      start_op(impl, reactor::read_op, op, true, false);
+    else
+    {
+      op->ec_ = asio::error::already_open;
+      io_service_impl_.post_immediate_completion(op);
+    }
+  }
+
+  // Start the asynchronous connect operation.
+  void start_connect_op(implementation_type& impl,
+      reactor_op* op, const endpoint_type& peer_endpoint)
+  {
+    if (is_open(impl))
+    {
+      if (is_non_blocking(impl) || set_non_blocking(impl, op->ec_))
+      {
+        if (socket_ops::connect(impl.socket_, peer_endpoint.data(),
+              peer_endpoint.size(), op->ec_) != 0)
+        {
+          if (op->ec_ == asio::error::in_progress
+              || op->ec_ == asio::error::would_block)
+          {
+            op->ec_ = asio::error_code();
+            reactor_.start_op(reactor::connect_op,
+                impl.socket_, impl.reactor_data_, op, false);
+            return;
+          }
+        }
+      }
+    }
+    else
+      op->ec_ = asio::error::bad_descriptor;
+
+    io_service_impl_.post_immediate_completion(op);
+  }
+
+  // Determine whether the socket has been set non-blocking.
+  bool is_non_blocking(implementation_type& impl) const
+  {
+    return (impl.flags_ & implementation_type::non_blocking);
+  }
+
+  // Set the internal non-blocking flag.
+  bool set_non_blocking(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    ioctl_arg_type non_blocking = 1;
+    if (socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec))
+      return false;
+    impl.flags_ |= implementation_type::internal_non_blocking;
+    return true;
+  }
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_impl_;
+
+  // The selector that performs event demultiplexing for the service.
+  reactor& reactor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_HPP
diff --git a/ext/asio/detail/reactor.hpp b/ext/asio/detail/reactor.hpp
new file mode 100644
index 0000000000..98ac360b9e
--- /dev/null
+++ b/ext/asio/detail/reactor.hpp
@@ -0,0 +1,34 @@
+//
+// reactor.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_REACTOR_HPP
+#define ASIO_DETAIL_REACTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/reactor_fwd.hpp"
+
+#if defined(ASIO_HAS_EPOLL)
+# include "asio/detail/epoll_reactor.hpp"
+#elif defined(ASIO_HAS_KQUEUE)
+# include "asio/detail/kqueue_reactor.hpp"
+#elif defined(ASIO_HAS_DEV_POLL)
+# include "asio/detail/dev_poll_reactor.hpp"
+#else
+# include "asio/detail/select_reactor.hpp"
+#endif
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTOR_HPP
diff --git a/ext/asio/detail/reactor_fwd.hpp b/ext/asio/detail/reactor_fwd.hpp
new file mode 100644
index 0000000000..9c33be54ca
--- /dev/null
+++ b/ext/asio/detail/reactor_fwd.hpp
@@ -0,0 +1,46 @@
+//
+// reactor_fwd.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_REACTOR_FWD_HPP
+#define ASIO_DETAIL_REACTOR_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/dev_poll_reactor_fwd.hpp"
+#include "asio/detail/epoll_reactor_fwd.hpp"
+#include "asio/detail/kqueue_reactor_fwd.hpp"
+#include "asio/detail/select_reactor_fwd.hpp"
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+namespace asio {
+namespace detail {
+
+#if defined(ASIO_HAS_IOCP)
+typedef select_reactor<true> reactor;
+#elif defined(ASIO_HAS_EPOLL)
+typedef epoll_reactor reactor;
+#elif defined(ASIO_HAS_KQUEUE)
+typedef kqueue_reactor reactor;
+#elif defined(ASIO_HAS_DEV_POLL)
+typedef dev_poll_reactor reactor;
+#else
+typedef select_reactor<false> reactor;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTOR_FWD_HPP
diff --git a/ext/asio/detail/reactor_op.hpp b/ext/asio/detail/reactor_op.hpp
new file mode 100644
index 0000000000..cd557fa6ae
--- /dev/null
+++ b/ext/asio/detail/reactor_op.hpp
@@ -0,0 +1,60 @@
+//
+// reactor_op.hpp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_REACTOR_OP_HPP
+#define ASIO_DETAIL_REACTOR_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/operation.hpp"
+
+namespace asio {
+namespace detail {
+
+class reactor_op
+  : public operation
+{
+public:
+  // The error code to be passed to the completion handler.
+  asio::error_code ec_;
+
+  // The number of bytes transferred, to be passed to the completion handler.
+  std::size_t bytes_transferred_;
+
+  // Perform the operation. Returns true if it is finished.
+  bool perform()
+  {
+    return perform_func_(this);
+  }
+
+protected:
+  typedef bool (*perform_func_type)(reactor_op*);
+
+  reactor_op(perform_func_type perform_func, func_type complete_func)
+    : operation(complete_func),
+      bytes_transferred_(0),
+      perform_func_(perform_func)
+  {
+  }
+
+private:
+  perform_func_type perform_func_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTOR_OP_HPP
diff --git a/ext/asio/detail/reactor_op_queue.hpp b/ext/asio/detail/reactor_op_queue.hpp
new file mode 100644
index 0000000000..233c0aec16
--- /dev/null
+++ b/ext/asio/detail/reactor_op_queue.hpp
@@ -0,0 +1,199 @@
+//
+// reactor_op_queue.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
+#define ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/hash_map.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/reactor_op.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Descriptor>
+class reactor_op_queue
+  : private noncopyable
+{
+public:
+  // Constructor.
+  reactor_op_queue()
+    : operations_()
+  {
+  }
+
+  // Add a new operation to the queue. Returns true if this is the only
+  // operation for the given descriptor, in which case the reactor's event
+  // demultiplexing function call may need to be interrupted and restarted.
+  bool enqueue_operation(Descriptor descriptor, reactor_op* op)
+  {
+    typedef typename operations_map::iterator iterator;
+    typedef typename operations_map::value_type value_type;
+    std::pair<iterator, bool> entry =
+      operations_.insert(value_type(descriptor, operations()));
+    entry.first->second.op_queue_.push(op);
+    return entry.second;
+  }
+
+  // Cancel all operations associated with the descriptor. Any operations
+  // pending for the descriptor will be notified that they have been cancelled
+  // next time perform_cancellations is called. Returns true if any operations
+  // were cancelled, in which case the reactor's event demultiplexing function
+  // may need to be interrupted and restarted.
+  bool cancel_operations(Descriptor descriptor, op_queue<operation>& ops,
+      const asio::error_code& ec =
+        asio::error::operation_aborted)
+  {
+    typename operations_map::iterator i = operations_.find(descriptor);
+    if (i != operations_.end())
+    {
+      while (reactor_op* op = i->second.op_queue_.front())
+      {
+        op->ec_ = ec;
+        i->second.op_queue_.pop();
+        ops.push(op);
+      }
+      operations_.erase(i);
+      return true;
+    }
+
+    return false;
+  }
+
+  // Whether there are no operations in the queue.
+  bool empty() const
+  {
+    return operations_.empty();
+  }
+
+  // Determine whether there are any operations associated with the descriptor.
+  bool has_operation(Descriptor descriptor) const
+  {
+    return operations_.find(descriptor) != operations_.end();
+  }
+
+  // Perform the operations corresponding to the descriptor. Returns true if
+  // there are still unfinished operations queued for the descriptor.
+  bool perform_operations(Descriptor descriptor, op_queue<operation>& ops)
+  {
+    typename operations_map::iterator i = operations_.find(descriptor);
+    if (i != operations_.end())
+    {
+      while (reactor_op* op = i->second.op_queue_.front())
+      {
+        if (op->perform())
+        {
+          i->second.op_queue_.pop();
+          ops.push(op);
+        }
+        else
+        {
+          return true;
+        }
+      }
+      operations_.erase(i);
+    }
+    return false;
+  }
+
+  // Fill a descriptor set with the descriptors corresponding to each active
+  // operation. The op_queue is used only when descriptors fail to be added to
+  // the descriptor set.
+  template <typename Descriptor_Set>
+  void get_descriptors(Descriptor_Set& descriptors, op_queue<operation>& ops)
+  {
+    typename operations_map::iterator i = operations_.begin();
+    while (i != operations_.end())
+    {
+      Descriptor descriptor = i->first;
+      ++i;
+      if (!descriptors.set(descriptor))
+      {
+        asio::error_code ec(error::fd_set_failure);
+        cancel_operations(descriptor, ops, ec);
+      }
+    }
+  }
+
+  // Perform the operations corresponding to the ready file descriptors
+  // contained in the given descriptor set.
+  template <typename Descriptor_Set>
+  void perform_operations_for_descriptors(
+      const Descriptor_Set& descriptors, op_queue<operation>& ops)
+  {
+    typename operations_map::iterator i = operations_.begin();
+    while (i != operations_.end())
+    {
+      typename operations_map::iterator op_iter = i++;
+      if (descriptors.is_set(op_iter->first))
+      {
+        while (reactor_op* op = op_iter->second.op_queue_.front())
+        {
+          if (op->perform())
+          {
+            op_iter->second.op_queue_.pop();
+            ops.push(op);
+          }
+          else
+          {
+            break;
+          }
+        }
+
+        if (op_iter->second.op_queue_.empty())
+          operations_.erase(op_iter);
+      }
+    }
+  }
+
+  // Get all operations owned by the queue.
+  void get_all_operations(op_queue<operation>& ops)
+  {
+    typename operations_map::iterator i = operations_.begin();
+    while (i != operations_.end())
+    {
+      typename operations_map::iterator op_iter = i++;
+      ops.push(op_iter->second.op_queue_);
+      operations_.erase(op_iter);
+    }
+  }
+
+private:
+  struct operations
+  {
+    operations() {}
+    operations(const operations&) {}
+    void operator=(const operations&) {}
+
+    // The operations waiting on the desccriptor.
+    op_queue<reactor_op> op_queue_;
+  };
+
+  // The type for a map of operations.
+  typedef hash_map<Descriptor, operations> operations_map;
+
+  // The operations that are currently executing asynchronously.
+  operations_map operations_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTOR_OP_QUEUE_HPP
diff --git a/ext/asio/detail/resolver_service.hpp b/ext/asio/detail/resolver_service.hpp
new file mode 100644
index 0000000000..562dc10476
--- /dev/null
+++ b/ext/asio/detail/resolver_service.hpp
@@ -0,0 +1,442 @@
+//
+// resolver_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_RESOLVER_SERVICE_HPP
+#define ASIO_DETAIL_RESOLVER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstring>
+#include <boost/scoped_ptr.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/operation.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/thread.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class resolver_service
+  : public asio::detail::service_base<resolver_service<Protocol> >
+{
+private:
+  // Helper class to perform exception-safe cleanup of addrinfo objects.
+  class auto_addrinfo
+    : private asio::detail::noncopyable
+  {
+  public:
+    explicit auto_addrinfo(asio::detail::addrinfo_type* ai)
+      : ai_(ai)
+    {
+    }
+
+    ~auto_addrinfo()
+    {
+      if (ai_)
+        socket_ops::freeaddrinfo(ai_);
+    }
+
+    operator asio::detail::addrinfo_type*()
+    {
+      return ai_;
+    }
+
+  private:
+    asio::detail::addrinfo_type* ai_;
+  };
+
+public:
+  // The implementation type of the resolver. The shared pointer is used as a
+  // cancellation token to indicate to the background thread that the operation
+  // has been cancelled.
+  typedef boost::shared_ptr<void> implementation_type;
+  struct noop_deleter { void operator()(void*) {} };
+
+  // The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  // The query type.
+  typedef asio::ip::basic_resolver_query<Protocol> query_type;
+
+  // The iterator type.
+  typedef asio::ip::basic_resolver_iterator<Protocol> iterator_type;
+
+  // Constructor.
+  resolver_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        resolver_service<Protocol> >(io_service),
+      mutex_(),
+      io_service_impl_(asio::use_service<io_service_impl>(io_service)),
+      work_io_service_(new asio::io_service),
+      work_io_service_impl_(asio::use_service<
+          io_service_impl>(*work_io_service_)),
+      work_(new asio::io_service::work(*work_io_service_)),
+      work_thread_(0)
+  {
+  }
+
+  // Destructor.
+  ~resolver_service()
+  {
+    shutdown_service();
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    work_.reset();
+    if (work_io_service_)
+    {
+      work_io_service_->stop();
+      if (work_thread_)
+      {
+        work_thread_->join();
+        work_thread_.reset();
+      }
+      work_io_service_.reset();
+    }
+  }
+
+  // Construct a new resolver implementation.
+  void construct(implementation_type& impl)
+  {
+    impl.reset(static_cast<void*>(0), noop_deleter());
+  }
+
+  // Destroy a resolver implementation.
+  void destroy(implementation_type&)
+  {
+  }
+
+  // Cancel pending asynchronous operations.
+  void cancel(implementation_type& impl)
+  {
+    impl.reset(static_cast<void*>(0), noop_deleter());
+  }
+
+  // Resolve a query to a list of entries.
+  iterator_type resolve(implementation_type&, const query_type& query,
+      asio::error_code& ec)
+  {
+    asio::detail::addrinfo_type* address_info = 0;
+    std::string host_name = query.host_name();
+    std::string service_name = query.service_name();
+    asio::detail::addrinfo_type hints = query.hints();
+
+    socket_ops::getaddrinfo(!host_name.empty() ? host_name.c_str() : 0,
+        service_name.c_str(), &hints, &address_info, ec);
+    auto_addrinfo auto_address_info(address_info);
+
+    if (ec)
+      return iterator_type();
+
+    return iterator_type::create(address_info, host_name, service_name);
+  }
+
+  template <typename Handler>
+  class resolve_op
+    : public operation
+  {
+  public:
+    resolve_op(implementation_type impl, const query_type& query,
+        io_service_impl& io_service_impl, Handler handler)
+      : operation(&resolve_op::do_complete),
+        impl_(impl),
+        query_(query),
+        io_service_impl_(io_service_impl),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the operation object.
+      resolve_op* o(static_cast<resolve_op*>(base));
+      typedef handler_alloc_traits<Handler, resolve_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      if (owner)
+      {
+        if (owner != &o->io_service_impl_)
+        {
+          // The operation is being run on the worker io_service. Time to
+          // perform the resolver operation.
+        
+          if (o->impl_.expired())
+          {
+            // THe operation has been cancelled.
+            o->ec_ = asio::error::operation_aborted;
+          }
+          else
+          {
+            // Perform the blocking host resolution operation.
+            asio::detail::addrinfo_type* address_info = 0;
+            std::string host_name = o->query_.host_name();
+            std::string service_name = o->query_.service_name();
+            asio::detail::addrinfo_type hints = o->query_.hints();
+            socket_ops::getaddrinfo(!host_name.empty() ? host_name.c_str() : 0,
+                service_name.c_str(), &hints, &address_info, o->ec_);
+            auto_addrinfo auto_address_info(address_info);
+            o->iter_ = iterator_type::create(
+              address_info, host_name, service_name);
+          }
+
+          o->io_service_impl_.post_deferred_completion(o);
+          ptr.release();
+        }
+        else
+        {
+          // The operation has been returned to the main io_serice. The
+          // completion handler is ready to be delivered.
+
+          // Make a copy of the handler so that the memory can be deallocated
+          // before the upcall is made. Even if we're not about to make an
+          // upcall, a sub-object of the handler may be the true owner of the
+          // memory associated with the handler. Consequently, a local copy of
+          // the handler is required to ensure that any owning sub-object
+          // remains valid until after we have deallocated the memory here.
+          detail::binder2<Handler, asio::error_code, iterator_type>
+            handler(o->handler_, o->ec_, o->iter_);
+          ptr.reset();
+          asio::detail::fenced_block b;
+          asio_handler_invoke_helpers::invoke(handler, handler);
+        }
+      }
+    }
+
+  private:
+    boost::weak_ptr<void> impl_;
+    query_type query_;
+    io_service_impl& io_service_impl_;
+    Handler handler_;
+    asio::error_code ec_;
+    iterator_type iter_;
+  };
+
+  // Asynchronously resolve a query to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl, const query_type& query,
+      Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef resolve_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr,
+        impl, query, io_service_impl_, handler);
+
+    if (work_io_service_)
+    {
+      start_work_thread();
+      io_service_impl_.work_started();
+      work_io_service_impl_.post_immediate_completion(ptr.get());
+      ptr.release();
+    }
+  }
+
+  // Resolve an endpoint to a list of entries.
+  iterator_type resolve(implementation_type&,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    // First try resolving with the service name. If that fails try resolving
+    // but allow the service to be returned as a number.
+    char host_name[NI_MAXHOST];
+    char service_name[NI_MAXSERV];
+    int flags = endpoint.protocol().type() == SOCK_DGRAM ? NI_DGRAM : 0;
+    socket_ops::getnameinfo(endpoint.data(), endpoint.size(),
+        host_name, NI_MAXHOST, service_name, NI_MAXSERV, flags, ec);
+    if (ec)
+    {
+      flags |= NI_NUMERICSERV;
+      socket_ops::getnameinfo(endpoint.data(), endpoint.size(),
+          host_name, NI_MAXHOST, service_name, NI_MAXSERV, flags, ec);
+    }
+
+    if (ec)
+      return iterator_type();
+
+    return iterator_type::create(endpoint, host_name, service_name);
+  }
+
+  template <typename Handler>
+  class resolve_endpoint_op
+    : public operation
+  {
+  public:
+    resolve_endpoint_op(implementation_type impl, const endpoint_type& ep,
+        io_service_impl& io_service_impl, Handler handler)
+      : operation(&resolve_endpoint_op::do_complete),
+        impl_(impl),
+        ep_(ep),
+        io_service_impl_(io_service_impl),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the operation object.
+      resolve_endpoint_op* o(static_cast<resolve_endpoint_op*>(base));
+      typedef handler_alloc_traits<Handler, resolve_endpoint_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      if (owner)
+      {
+        if (owner != &o->io_service_impl_)
+        {
+          // The operation is being run on the worker io_service. Time to
+          // perform the resolver operation.
+        
+          if (o->impl_.expired())
+          {
+            // THe operation has been cancelled.
+            o->ec_ = asio::error::operation_aborted;
+          }
+          else
+          {
+            // Perform the blocking endoint resolution operation.
+            char host_name[NI_MAXHOST];
+            char service_name[NI_MAXSERV];
+            int flags = o->ep_.protocol().type() == SOCK_DGRAM ? NI_DGRAM : 0;
+            socket_ops::getnameinfo(o->ep_.data(), o->ep_.size(),
+                host_name, NI_MAXHOST, service_name,
+                NI_MAXSERV, flags, o->ec_);
+            if (o->ec_)
+            {
+              flags |= NI_NUMERICSERV;
+              socket_ops::getnameinfo(o->ep_.data(), o->ep_.size(),
+                  host_name, NI_MAXHOST, service_name,
+                  NI_MAXSERV, flags, o->ec_);
+            }
+            o->iter_ = iterator_type::create(o->ep_, host_name, service_name);
+          }
+
+          o->io_service_impl_.post_deferred_completion(o);
+          ptr.release();
+        }
+        else
+        {
+          // The operation has been returned to the main io_serice. The
+          // completion handler is ready to be delivered.
+
+          // Make a copy of the handler so that the memory can be deallocated
+          // before the upcall is made. Even if we're not about to make an
+          // upcall, a sub-object of the handler may be the true owner of the
+          // memory associated with the handler. Consequently, a local copy of
+          // the handler is required to ensure that any owning sub-object
+          // remains valid until after we have deallocated the memory here.
+          detail::binder2<Handler, asio::error_code, iterator_type>
+            handler(o->handler_, o->ec_, o->iter_);
+          ptr.reset();
+          asio::detail::fenced_block b;
+          asio_handler_invoke_helpers::invoke(handler, handler);
+        }
+      }
+    }
+
+  private:
+    boost::weak_ptr<void> impl_;
+    endpoint_type ep_;
+    io_service_impl& io_service_impl_;
+    Handler handler_;
+    asio::error_code ec_;
+    iterator_type iter_;
+  };
+
+  // Asynchronously resolve an endpoint to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl, const endpoint_type& endpoint,
+      Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef resolve_endpoint_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr,
+        impl, endpoint, io_service_impl_, handler);
+
+    if (work_io_service_)
+    {
+      start_work_thread();
+      io_service_impl_.work_started();
+      work_io_service_impl_.post_immediate_completion(ptr.get());
+      ptr.release();
+    }
+  }
+
+private:
+  // Helper class to run the work io_service in a thread.
+  class work_io_service_runner
+  {
+  public:
+    work_io_service_runner(asio::io_service& io_service)
+      : io_service_(io_service) {}
+    void operator()() { io_service_.run(); }
+  private:
+    asio::io_service& io_service_;
+  };
+
+  // Start the work thread if it's not already running.
+  void start_work_thread()
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    if (!work_thread_)
+    {
+      work_thread_.reset(new asio::detail::thread(
+            work_io_service_runner(*work_io_service_)));
+    }
+  }
+
+  // Mutex to protect access to internal data.
+  asio::detail::mutex mutex_;
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_impl_;
+
+  // Private io_service used for performing asynchronous host resolution.
+  boost::scoped_ptr<asio::io_service> work_io_service_;
+
+  // The work io_service implementation used to post completions.
+  io_service_impl& work_io_service_impl_;
+
+  // Work for the private io_service to perform.
+  boost::scoped_ptr<asio::io_service::work> work_;
+
+  // Thread used for running the work io_service's run loop.
+  boost::scoped_ptr<asio::detail::thread> work_thread_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_RESOLVER_SERVICE_HPP
diff --git a/ext/asio/detail/scoped_lock.hpp b/ext/asio/detail/scoped_lock.hpp
new file mode 100644
index 0000000000..e6f6ba59a0
--- /dev/null
+++ b/ext/asio/detail/scoped_lock.hpp
@@ -0,0 +1,91 @@
+//
+// scoped_lock.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SCOPED_LOCK_HPP
+#define ASIO_DETAIL_SCOPED_LOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+// Helper class to lock and unlock a mutex automatically.
+template <typename Mutex>
+class scoped_lock
+  : private noncopyable
+{
+public:
+  // Constructor acquires the lock.
+  scoped_lock(Mutex& m)
+    : mutex_(m)
+  {
+    mutex_.lock();
+    locked_ = true;
+  }
+
+  // Destructor releases the lock.
+  ~scoped_lock()
+  {
+    if (locked_)
+      mutex_.unlock();
+  }
+
+  // Explicitly acquire the lock.
+  void lock()
+  {
+    if (!locked_)
+    {
+      mutex_.lock();
+      locked_ = true;
+    }
+  }
+
+  // Explicitly release the lock.
+  void unlock()
+  {
+    if (locked_)
+    {
+      mutex_.unlock();
+      locked_ = false;
+    }
+  }
+
+  // Test whether the lock is held.
+  bool locked() const
+  {
+    return locked_;
+  }
+
+  // Get the underlying mutex.
+  Mutex& mutex()
+  {
+    return mutex_;
+  }
+
+private:
+  // The underlying mutex.
+  Mutex& mutex_;
+
+  // Whether the mutex is currently locked or unlocked.
+  bool locked_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SCOPED_LOCK_HPP
diff --git a/ext/asio/detail/select_interrupter.hpp b/ext/asio/detail/select_interrupter.hpp
new file mode 100644
index 0000000000..ff5505bebc
--- /dev/null
+++ b/ext/asio/detail/select_interrupter.hpp
@@ -0,0 +1,47 @@
+//
+// select_interrupter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SELECT_INTERRUPTER_HPP
+#define ASIO_DETAIL_SELECT_INTERRUPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# include "asio/detail/socket_select_interrupter.hpp"
+#else
+# include "asio/detail/eventfd_select_interrupter.hpp"
+# include "asio/detail/pipe_select_interrupter.hpp"
+#endif
+
+namespace asio {
+namespace detail {
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+typedef socket_select_interrupter select_interrupter;
+#elif defined(ASIO_HAS_EVENTFD)
+typedef eventfd_select_interrupter select_interrupter;
+#else
+typedef pipe_select_interrupter select_interrupter;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SELECT_INTERRUPTER_HPP
diff --git a/ext/asio/detail/select_reactor.hpp b/ext/asio/detail/select_reactor.hpp
new file mode 100644
index 0000000000..798611b281
--- /dev/null
+++ b/ext/asio/detail/select_reactor.hpp
@@ -0,0 +1,374 @@
+//
+// select_reactor.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SELECT_REACTOR_HPP
+#define ASIO_DETAIL_SELECT_REACTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/socket_types.hpp" // Must come before posix_time.
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/fd_set_adapter.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/reactor_op.hpp"
+#include "asio/detail/reactor_op_queue.hpp"
+#include "asio/detail/select_interrupter.hpp"
+#include "asio/detail/select_reactor_fwd.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/signal_blocker.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/thread.hpp"
+#include "asio/detail/timer_op.hpp"
+#include "asio/detail/timer_queue_base.hpp"
+#include "asio/detail/timer_queue_fwd.hpp"
+#include "asio/detail/timer_queue_set.hpp"
+
+namespace asio {
+namespace detail {
+
+template <bool Own_Thread>
+class select_reactor
+  : public asio::detail::service_base<select_reactor<Own_Thread> >
+{
+public:
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  enum { read_op = 0, write_op = 1, except_op = 2,
+    max_select_ops = 3, connect_op = 3, max_ops = 4 };
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  enum { read_op = 0, write_op = 1, except_op = 2,
+    max_select_ops = 3, connect_op = 1, max_ops = 3 };
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+  // Per-descriptor data.
+  struct per_descriptor_data
+  {
+  };
+
+  // Constructor.
+  select_reactor(asio::io_service& io_service)
+    : asio::detail::service_base<
+        select_reactor<Own_Thread> >(io_service),
+      io_service_(use_service<io_service_impl>(io_service)),
+      mutex_(),
+      interrupter_(),
+      stop_thread_(false),
+      thread_(0),
+      shutdown_(false)
+  {
+    if (Own_Thread)
+    {
+      asio::detail::signal_blocker sb;
+      thread_ = new asio::detail::thread(
+          bind_handler(&select_reactor::call_run_thread, this));
+    }
+  }
+
+  // Destructor.
+  ~select_reactor()
+  {
+    shutdown_service();
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    shutdown_ = true;
+    stop_thread_ = true;
+    lock.unlock();
+
+    if (Own_Thread)
+    {
+      if (thread_)
+      {
+        interrupter_.interrupt();
+        thread_->join();
+        delete thread_;
+        thread_ = 0;
+      }
+    }
+
+    op_queue<operation> ops;
+
+    for (int i = 0; i < max_ops; ++i)
+      op_queue_[i].get_all_operations(ops);
+
+    timer_queues_.get_all_timers(ops);
+  }
+
+  // Initialise the task, but only if the reactor is not in its own thread.
+  void init_task()
+  {
+    io_service_.init_task();
+  }
+
+  // Register a socket with the reactor. Returns 0 on success, system error
+  // code on failure.
+  int register_descriptor(socket_type, per_descriptor_data&)
+  {
+    return 0;
+  }
+
+  // Start a new operation. The reactor operation will be performed when the
+  // given descriptor is flagged as ready, or an error has occurred.
+  void start_op(int op_type, socket_type descriptor,
+      per_descriptor_data&, reactor_op* op, bool)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    if (!shutdown_)
+    {
+      bool first = op_queue_[op_type].enqueue_operation(descriptor, op);
+      io_service_.work_started();
+      if (first)
+        interrupter_.interrupt();
+    }
+  }
+
+  // Cancel all operations associated with the given descriptor. The
+  // handlers associated with the descriptor will be invoked with the
+  // operation_aborted error.
+  void cancel_ops(socket_type descriptor, per_descriptor_data&)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    cancel_ops_unlocked(descriptor, asio::error::operation_aborted);
+  }
+
+  // Cancel any operations that are running against the descriptor and remove
+  // its registration from the reactor.
+  void close_descriptor(socket_type descriptor, per_descriptor_data&)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    cancel_ops_unlocked(descriptor, asio::error::operation_aborted);
+  }
+
+  // Add a new timer queue to the reactor.
+  template <typename Time_Traits>
+  void add_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    timer_queues_.insert(&timer_queue);
+  }
+
+  // Remove a timer queue from the reactor.
+  template <typename Time_Traits>
+  void remove_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    timer_queues_.erase(&timer_queue);
+  }
+
+  // Schedule a new operation in the given timer queue to expire at the
+  // specified absolute time.
+  template <typename Time_Traits>
+  void schedule_timer(timer_queue<Time_Traits>& timer_queue,
+      const typename Time_Traits::time_type& time, timer_op* op, void* token)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    if (!shutdown_)
+    {
+      bool earliest = timer_queue.enqueue_timer(time, op, token);
+      io_service_.work_started();
+      if (earliest)
+        interrupter_.interrupt();
+    }
+  }
+
+  // Cancel the timer operations associated with the given token. Returns the
+  // number of operations that have been posted or dispatched.
+  template <typename Time_Traits>
+  std::size_t cancel_timer(timer_queue<Time_Traits>& timer_queue, void* token)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    op_queue<operation> ops;
+    std::size_t n = timer_queue.cancel_timer(token, ops);
+    lock.unlock();
+    io_service_.post_deferred_completions(ops);
+    return n;
+  }
+
+  // Run select once until interrupted or events are ready to be dispatched.
+  void run(bool block, op_queue<operation>& ops)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    // Check if the thread is supposed to stop.
+    if (Own_Thread)
+      if (stop_thread_)
+        return;
+
+    // Set up the descriptor sets.
+    fd_set_adapter fds[max_select_ops];
+    fds[read_op].set(interrupter_.read_descriptor());
+    socket_type max_fd = 0;
+    bool have_work_to_do = !timer_queues_.all_empty();
+    for (int i = 0; i < max_select_ops; ++i)
+    {
+      have_work_to_do = have_work_to_do || !op_queue_[i].empty();
+      op_queue_[i].get_descriptors(fds[i], ops);
+      if (fds[i].max_descriptor() > max_fd)
+        max_fd = fds[i].max_descriptor();
+    }
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+    // Connection operations on Windows use both except and write fd_sets.
+    have_work_to_do = have_work_to_do || !op_queue_[connect_op].empty();
+    op_queue_[connect_op].get_descriptors(fds[write_op], ops);
+    if (fds[write_op].max_descriptor() > max_fd)
+      max_fd = fds[write_op].max_descriptor();
+    op_queue_[connect_op].get_descriptors(fds[except_op], ops);
+    if (fds[except_op].max_descriptor() > max_fd)
+      max_fd = fds[except_op].max_descriptor();
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+    // We can return immediately if there's no work to do and the reactor is
+    // not supposed to block.
+    if (!block && !have_work_to_do)
+      return;
+
+    // Determine how long to block while waiting for events.
+    timeval tv_buf = { 0, 0 };
+    timeval* tv = block ? get_timeout(tv_buf) : &tv_buf;
+
+    lock.unlock();
+
+    // Block on the select call until descriptors become ready.
+    asio::error_code ec;
+    int retval = socket_ops::select(static_cast<int>(max_fd + 1),
+        fds[read_op], fds[write_op], fds[except_op], tv, ec);
+
+    // Reset the interrupter.
+    if (retval > 0 && fds[read_op].is_set(interrupter_.read_descriptor()))
+      interrupter_.reset();
+
+    lock.lock();
+
+    // Dispatch all ready operations.
+    if (retval > 0)
+    {
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+      // Connection operations on Windows use both except and write fd_sets.
+      op_queue_[connect_op].perform_operations_for_descriptors(
+          fds[except_op], ops);
+      op_queue_[connect_op].perform_operations_for_descriptors(
+          fds[write_op], ops);
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+      // Exception operations must be processed first to ensure that any
+      // out-of-band data is read before normal data.
+      for (int i = max_select_ops - 1; i >= 0; --i)
+        op_queue_[i].perform_operations_for_descriptors(fds[i], ops);
+    }
+    timer_queues_.get_ready_timers(ops);
+  }
+
+  // Interrupt the select loop.
+  void interrupt()
+  {
+    interrupter_.interrupt();
+  }
+
+private:
+  // Run the select loop in the thread.
+  void run_thread()
+  {
+    if (Own_Thread)
+    {
+      asio::detail::mutex::scoped_lock lock(mutex_);
+      while (!stop_thread_)
+      {
+        lock.unlock();
+        op_queue<operation> ops;
+        run(true, ops);
+        io_service_.post_deferred_completions(ops);
+        lock.lock();
+      }
+    }
+  }
+
+  // Entry point for the select loop thread.
+  static void call_run_thread(select_reactor* reactor)
+  {
+    if (Own_Thread)
+    {
+      reactor->run_thread();
+    }
+  }
+
+  // Get the timeout value for the select call.
+  timeval* get_timeout(timeval& tv)
+  {
+    // By default we will wait no longer than 5 minutes. This will ensure that
+    // any changes to the system clock are detected after no longer than this.
+    long usec = timer_queues_.wait_duration_usec(5 * 60 * 1000 * 1000);
+    tv.tv_sec = usec / 1000000;
+    tv.tv_usec = usec % 1000000;
+    return &tv;
+  }
+
+  // Cancel all operations associated with the given descriptor. This function
+  // does not acquire the select_reactor's mutex.
+  void cancel_ops_unlocked(socket_type descriptor,
+      const asio::error_code& ec)
+  {
+    bool need_interrupt = false;
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+      need_interrupt = op_queue_[i].cancel_operations(
+          descriptor, ops, ec) || need_interrupt;
+    io_service_.post_deferred_completions(ops);
+    if (need_interrupt)
+      interrupter_.interrupt();
+  }
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_;
+
+  // Mutex to protect access to internal data.
+  asio::detail::mutex mutex_;
+
+  // The interrupter is used to break a blocking select call.
+  select_interrupter interrupter_;
+
+  // The queues of read, write and except operations.
+  reactor_op_queue<socket_type> op_queue_[max_ops];
+
+  // The timer queues.
+  timer_queue_set timer_queues_;
+
+  // Does the reactor loop thread need to stop.
+  bool stop_thread_;
+
+  // The thread that is running the reactor loop.
+  asio::detail::thread* thread_;
+
+  // Whether the service has been shut down.
+  bool shutdown_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SELECT_REACTOR_HPP
diff --git a/ext/asio/detail/select_reactor_fwd.hpp b/ext/asio/detail/select_reactor_fwd.hpp
new file mode 100644
index 0000000000..0b72e7e8aa
--- /dev/null
+++ b/ext/asio/detail/select_reactor_fwd.hpp
@@ -0,0 +1,31 @@
+//
+// select_reactor_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SELECT_REACTOR_FWD_HPP
+#define ASIO_DETAIL_SELECT_REACTOR_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <bool Own_Thread>
+class select_reactor;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SELECT_REACTOR_FWD_HPP
diff --git a/ext/asio/detail/service_base.hpp b/ext/asio/detail/service_base.hpp
new file mode 100644
index 0000000000..45000c3f89
--- /dev/null
+++ b/ext/asio/detail/service_base.hpp
@@ -0,0 +1,49 @@
+//
+// service_base.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SERVICE_BASE_HPP
+#define ASIO_DETAIL_SERVICE_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/service_id.hpp"
+
+namespace asio {
+namespace detail {
+
+// Special service base class to keep classes header-file only.
+template <typename Type>
+class service_base
+  : public asio::io_service::service
+{
+public:
+  static asio::detail::service_id<Type> id;
+
+  // Constructor.
+  service_base(asio::io_service& io_service)
+    : asio::io_service::service(io_service)
+  {
+  }
+};
+
+template <typename Type>
+asio::detail::service_id<Type> service_base<Type>::id;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SERVICE_BASE_HPP
diff --git a/ext/asio/detail/service_id.hpp b/ext/asio/detail/service_id.hpp
new file mode 100644
index 0000000000..baf6cce22b
--- /dev/null
+++ b/ext/asio/detail/service_id.hpp
@@ -0,0 +1,37 @@
+//
+// service_id.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SERVICE_ID_HPP
+#define ASIO_DETAIL_SERVICE_ID_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/io_service.hpp"
+
+namespace asio {
+namespace detail {
+
+// Special derived service id type to keep classes header-file only.
+template <typename Type>
+class service_id
+  : public asio::io_service::id
+{
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SERVICE_ID_HPP
diff --git a/ext/asio/detail/service_registry.hpp b/ext/asio/detail/service_registry.hpp
new file mode 100644
index 0000000000..f80b4b6953
--- /dev/null
+++ b/ext/asio/detail/service_registry.hpp
@@ -0,0 +1,275 @@
+//
+// service_registry.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SERVICE_REGISTRY_HPP
+#define ASIO_DETAIL_SERVICE_REGISTRY_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <typeinfo>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/service_id.hpp"
+
+#if defined(BOOST_NO_TYPEID)
+# if !defined(ASIO_NO_TYPEID)
+#  define ASIO_NO_TYPEID
+# endif // !defined(ASIO_NO_TYPEID)
+#endif // defined(BOOST_NO_TYPEID)
+
+namespace asio {
+namespace detail {
+
+#if defined(__GNUC__)
+# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#  pragma GCC visibility push (default)
+# endif // (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#endif // defined(__GNUC__)
+
+template <typename T>
+class typeid_wrapper {};
+
+#if defined(__GNUC__)
+# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#  pragma GCC visibility pop
+# endif // (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#endif // defined(__GNUC__)
+
+class service_registry
+  : private noncopyable
+{
+public:
+  // Constructor.
+  service_registry(asio::io_service& o)
+    : owner_(o),
+      first_service_(0)
+  {
+  }
+
+  // Destructor.
+  ~service_registry()
+  {
+    // Shutdown all services. This must be done in a separate loop before the
+    // services are destroyed since the destructors of user-defined handler
+    // objects may try to access other service objects.
+    asio::io_service::service* service = first_service_;
+    while (service)
+    {
+      service->shutdown_service();
+      service = service->next_;
+    }
+
+    // Destroy all services.
+    while (first_service_)
+    {
+      asio::io_service::service* next_service = first_service_->next_;
+      destroy(first_service_);
+      first_service_ = next_service;
+    }
+  }
+
+  // Get the service object corresponding to the specified service type. Will
+  // create a new service object automatically if no such object already
+  // exists. Ownership of the service object is not transferred to the caller.
+  template <typename Service>
+  Service& use_service()
+  {
+    asio::io_service::service::key key;
+    init_key(key, Service::id);
+    factory_type factory = &service_registry::create<Service>;
+    return *static_cast<Service*>(do_use_service(key, factory));
+  }
+
+  // Add a service object. Returns false on error, in which case ownership of
+  // the object is retained by the caller.
+  template <typename Service>
+  bool add_service(Service* new_service)
+  {
+    asio::io_service::service::key key;
+    init_key(key, Service::id);
+    return do_add_service(key, new_service);
+  }
+
+  // Check whether a service object of the specified type already exists.
+  template <typename Service>
+  bool has_service() const
+  {
+    asio::io_service::service::key key;
+    init_key(key, Service::id);
+    return do_has_service(key);
+  }
+
+private:
+  // Initialise a service's key based on its id.
+  void init_key(asio::io_service::service::key& key,
+      const asio::io_service::id& id)
+  {
+    key.type_info_ = 0;
+    key.id_ = &id;
+  }
+
+#if !defined(ASIO_NO_TYPEID)
+  // Initialise a service's key based on its id.
+  template <typename Service>
+  void init_key(asio::io_service::service::key& key,
+      const asio::detail::service_id<Service>& /*id*/)
+  {
+    key.type_info_ = &typeid(typeid_wrapper<Service>);
+    key.id_ = 0;
+  }
+#endif // !defined(ASIO_NO_TYPEID)
+
+  // Check if a service matches the given id.
+  static bool keys_match(
+      const asio::io_service::service::key& key1,
+      const asio::io_service::service::key& key2)
+  {
+    if (key1.id_ && key2.id_)
+      if (key1.id_ == key2.id_)
+        return true;
+    if (key1.type_info_ && key2.type_info_)
+      if (*key1.type_info_ == *key2.type_info_)
+        return true;
+    return false;
+  }
+
+  // The type of a factory function used for creating a service instance.
+  typedef asio::io_service::service*
+    (*factory_type)(asio::io_service&);
+
+  // Factory function for creating a service instance.
+  template <typename Service>
+  static asio::io_service::service* create(
+      asio::io_service& owner)
+  {
+    return new Service(owner);
+  }
+
+  // Destroy a service instance.
+  static void destroy(asio::io_service::service* service)
+  {
+    delete service;
+  }
+
+  // Helper class to manage service pointers.
+  struct auto_service_ptr
+  {
+    asio::io_service::service* ptr_;
+    ~auto_service_ptr() { destroy(ptr_); }
+  };
+
+  // Get the service object corresponding to the specified service key. Will
+  // create a new service object automatically if no such object already
+  // exists. Ownership of the service object is not transferred to the caller.
+  asio::io_service::service* do_use_service(
+      const asio::io_service::service::key& key,
+      factory_type factory)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    // First see if there is an existing service object with the given key.
+    asio::io_service::service* service = first_service_;
+    while (service)
+    {
+      if (keys_match(service->key_, key))
+        return service;
+      service = service->next_;
+    }
+
+    // Create a new service object. The service registry's mutex is not locked
+    // at this time to allow for nested calls into this function from the new
+    // service's constructor.
+    lock.unlock();
+    auto_service_ptr new_service = { factory(owner_) };
+    new_service.ptr_->key_ = key;
+    lock.lock();
+
+    // Check that nobody else created another service object of the same type
+    // while the lock was released.
+    service = first_service_;
+    while (service)
+    {
+      if (keys_match(service->key_, key))
+        return service;
+      service = service->next_;
+    }
+
+    // Service was successfully initialised, pass ownership to registry.
+    new_service.ptr_->next_ = first_service_;
+    first_service_ = new_service.ptr_;
+    new_service.ptr_ = 0;
+    return first_service_;
+  }
+
+  // Add a service object. Returns false on error, in which case ownership of
+  // the object is retained by the caller.
+  bool do_add_service(
+      const asio::io_service::service::key& key,
+      asio::io_service::service* new_service)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    // Check if there is an existing service object with the given key.
+    asio::io_service::service* service = first_service_;
+    while (service)
+    {
+      if (keys_match(service->key_, key))
+        return false;
+      service = service->next_;
+    }
+
+    // Take ownership of the service object.
+    new_service->key_ = key;
+    new_service->next_ = first_service_;
+    first_service_ = new_service;
+
+    return true;
+  }
+
+  // Check whether a service object with the specified key already exists.
+  bool do_has_service(const asio::io_service::service::key& key) const
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    asio::io_service::service* service = first_service_;
+    while (service)
+    {
+      if (keys_match(service->key_, key))
+        return true;
+      service = service->next_;
+    }
+
+    return false;
+  }
+
+  // Mutex to protect access to internal data.
+  mutable asio::detail::mutex mutex_;
+
+  // The owner of this service registry and the services it contains.
+  asio::io_service& owner_;
+
+  // The first service in the list of contained services.
+  asio::io_service::service* first_service_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SERVICE_REGISTRY_HPP
diff --git a/ext/asio/detail/service_registry_fwd.hpp b/ext/asio/detail/service_registry_fwd.hpp
new file mode 100644
index 0000000000..423bb4beef
--- /dev/null
+++ b/ext/asio/detail/service_registry_fwd.hpp
@@ -0,0 +1,30 @@
+//
+// service_registry_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SERVICE_REGISTRY_FWD_HPP
+#define ASIO_DETAIL_SERVICE_REGISTRY_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class service_registry;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SERVICE_REGISTRY_FWD_HPP
diff --git a/ext/asio/detail/signal_blocker.hpp b/ext/asio/detail/signal_blocker.hpp
new file mode 100644
index 0000000000..52f70c8578
--- /dev/null
+++ b/ext/asio/detail/signal_blocker.hpp
@@ -0,0 +1,50 @@
+//
+// signal_blocker.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SIGNAL_BLOCKER_HPP
+#define ASIO_DETAIL_SIGNAL_BLOCKER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+# include "asio/detail/null_signal_blocker.hpp"
+#elif defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# include "asio/detail/win_signal_blocker.hpp"
+#elif defined(BOOST_HAS_PTHREADS)
+# include "asio/detail/posix_signal_blocker.hpp"
+#else
+# error Only Windows and POSIX are supported!
+#endif
+
+namespace asio {
+namespace detail {
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+typedef null_signal_blocker signal_blocker;
+#elif defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+typedef win_signal_blocker signal_blocker;
+#elif defined(BOOST_HAS_PTHREADS)
+typedef posix_signal_blocker signal_blocker;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SIGNAL_BLOCKER_HPP
diff --git a/ext/asio/detail/signal_init.hpp b/ext/asio/detail/signal_init.hpp
new file mode 100644
index 0000000000..12f17d37ac
--- /dev/null
+++ b/ext/asio/detail/signal_init.hpp
@@ -0,0 +1,51 @@
+//
+// signal_init.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SIGNAL_INIT_HPP
+#define ASIO_DETAIL_SIGNAL_INIT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/push_options.hpp"
+#include <csignal>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <int Signal = SIGPIPE>
+class signal_init
+{
+public:
+  // Constructor.
+  signal_init()
+  {
+    std::signal(Signal, SIG_IGN);
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SIGNAL_INIT_HPP
diff --git a/ext/asio/detail/socket_holder.hpp b/ext/asio/detail/socket_holder.hpp
new file mode 100644
index 0000000000..82a38848a5
--- /dev/null
+++ b/ext/asio/detail/socket_holder.hpp
@@ -0,0 +1,95 @@
+//
+// socket_holder.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SOCKET_HOLDER_HPP
+#define ASIO_DETAIL_SOCKET_HOLDER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_ops.hpp"
+
+namespace asio {
+namespace detail {
+
+// Implement the resource acquisition is initialisation idiom for sockets.
+class socket_holder
+  : private noncopyable
+{
+public:
+  // Construct as an uninitialised socket.
+  socket_holder()
+    : socket_(invalid_socket)
+  {
+  }
+
+  // Construct to take ownership of the specified socket.
+  explicit socket_holder(socket_type s)
+    : socket_(s)
+  {
+  }
+
+  // Destructor.
+  ~socket_holder()
+  {
+    if (socket_ != invalid_socket)
+    {
+      asio::error_code ec;
+      socket_ops::close(socket_, ec);
+    }
+  }
+
+  // Get the underlying socket.
+  socket_type get() const
+  {
+    return socket_;
+  }
+
+  // Reset to an uninitialised socket.
+  void reset()
+  {
+    if (socket_ != invalid_socket)
+    {
+      asio::error_code ec;
+      socket_ops::close(socket_, ec);
+      socket_ = invalid_socket;
+    }
+  }
+
+  // Reset to take ownership of the specified socket.
+  void reset(socket_type s)
+  {
+    reset();
+    socket_ = s;
+  }
+
+  // Release ownership of the socket.
+  socket_type release()
+  {
+    socket_type tmp = socket_;
+    socket_ = invalid_socket;
+    return tmp;
+  }
+
+private:
+  // The underlying socket.
+  socket_type socket_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SOCKET_HOLDER_HPP
diff --git a/ext/asio/detail/socket_ops.hpp b/ext/asio/detail/socket_ops.hpp
new file mode 100644
index 0000000000..1a863a9175
--- /dev/null
+++ b/ext/asio/detail/socket_ops.hpp
@@ -0,0 +1,1912 @@
+//
+// socket_ops.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SOCKET_OPS_HPP
+#define ASIO_DETAIL_SOCKET_OPS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/assert.hpp>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <cerrno>
+#include <boost/detail/workaround.hpp>
+#include <new>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+namespace socket_ops {
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+struct msghdr { int msg_namelen; };
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#if defined(__hpux)
+// HP-UX doesn't declare these functions extern "C", so they are declared again
+// here to avoid linker errors about undefined symbols.
+extern "C" char* if_indextoname(unsigned int, char*);
+extern "C" unsigned int if_nametoindex(const char*);
+#endif // defined(__hpux)
+
+inline void clear_error(asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  WSASetLastError(0);
+#else
+  errno = 0;
+#endif
+  ec = asio::error_code();
+}
+
+template <typename ReturnType>
+inline ReturnType error_wrapper(ReturnType return_value,
+    asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  ec = asio::error_code(WSAGetLastError(),
+      asio::error::get_system_category());
+#else
+  ec = asio::error_code(errno,
+      asio::error::get_system_category());
+#endif
+  return return_value;
+}
+
+template <typename SockLenType>
+inline socket_type call_accept(SockLenType msghdr::*,
+    socket_type s, socket_addr_type* addr, std::size_t* addrlen)
+{
+  SockLenType tmp_addrlen = addrlen ? (SockLenType)*addrlen : 0;
+  socket_type result = ::accept(s, addr, addrlen ? &tmp_addrlen : 0);
+  if (addrlen)
+    *addrlen = (std::size_t)tmp_addrlen;
+  return result;
+}
+
+inline socket_type accept(socket_type s, socket_addr_type* addr,
+    std::size_t* addrlen, asio::error_code& ec)
+{
+  clear_error(ec);
+
+  socket_type new_s = error_wrapper(call_accept(
+        &msghdr::msg_namelen, s, addr, addrlen), ec);
+  if (new_s == invalid_socket)
+    return new_s;
+
+#if defined(__MACH__) && defined(__APPLE__) || defined(__FreeBSD__)
+  int optval = 1;
+  int result = error_wrapper(::setsockopt(new_s,
+        SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)), ec);
+  if (result != 0)
+  {
+    ::close(new_s);
+    return invalid_socket;
+  }
+#endif
+
+  clear_error(ec);
+  return new_s;
+}
+
+template <typename SockLenType>
+inline int call_bind(SockLenType msghdr::*,
+    socket_type s, const socket_addr_type* addr, std::size_t addrlen)
+{
+  return ::bind(s, addr, (SockLenType)addrlen);
+}
+
+inline int bind(socket_type s, const socket_addr_type* addr,
+    std::size_t addrlen, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(call_bind(
+        &msghdr::msg_namelen, s, addr, addrlen), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int close(socket_type s, asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  int result = error_wrapper(::closesocket(s), ec);
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  int result = error_wrapper(::close(s), ec);
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int shutdown(socket_type s, int what, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::shutdown(s, what), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+template <typename SockLenType>
+inline int call_connect(SockLenType msghdr::*,
+    socket_type s, const socket_addr_type* addr, std::size_t addrlen)
+{
+  return ::connect(s, addr, (SockLenType)addrlen);
+}
+
+inline int connect(socket_type s, const socket_addr_type* addr,
+    std::size_t addrlen, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(call_connect(
+        &msghdr::msg_namelen, s, addr, addrlen), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int socketpair(int af, int type, int protocol,
+    socket_type sv[2], asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  (void)(af);
+  (void)(type);
+  (void)(protocol);
+  (void)(sv);
+  ec = asio::error::operation_not_supported;
+  return -1;
+#else
+  clear_error(ec);
+  int result = error_wrapper(::socketpair(af, type, protocol, sv), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+#endif
+}
+
+inline int listen(socket_type s, int backlog, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::listen(s, backlog), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+inline void init_buf_iov_base(void*& base, void* addr)
+{
+  base = addr;
+}
+
+template <typename T>
+inline void init_buf_iov_base(T& base, void* addr)
+{
+  base = static_cast<T>(addr);
+}
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+typedef WSABUF buf;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+typedef iovec buf;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+inline void init_buf(buf& b, void* data, size_t size)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  b.buf = static_cast<char*>(data);
+  b.len = static_cast<u_long>(size);
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  init_buf_iov_base(b.iov_base, data);
+  b.iov_len = size;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline void init_buf(buf& b, const void* data, size_t size)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  b.buf = static_cast<char*>(const_cast<void*>(data));
+  b.len = static_cast<u_long>(size);
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  init_buf_iov_base(b.iov_base, const_cast<void*>(data));
+  b.iov_len = size;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline void init_msghdr_msg_name(void*& name, socket_addr_type* addr)
+{
+  name = addr;
+}
+
+inline void init_msghdr_msg_name(void*& name, const socket_addr_type* addr)
+{
+  name = const_cast<socket_addr_type*>(addr);
+}
+
+template <typename T>
+inline void init_msghdr_msg_name(T& name, socket_addr_type* addr)
+{
+  name = reinterpret_cast<T>(addr);
+}
+
+template <typename T>
+inline void init_msghdr_msg_name(T& name, const socket_addr_type* addr)
+{
+  name = reinterpret_cast<T>(const_cast<socket_addr_type*>(addr));
+}
+
+inline int recv(socket_type s, buf* bufs, size_t count, int flags,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  // Receive some data.
+  DWORD recv_buf_count = static_cast<DWORD>(count);
+  DWORD bytes_transferred = 0;
+  DWORD recv_flags = flags;
+  int result = error_wrapper(::WSARecv(s, bufs,
+        recv_buf_count, &bytes_transferred, &recv_flags, 0, 0), ec);
+  if (result != 0)
+    return -1;
+  clear_error(ec);
+  return bytes_transferred;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  msghdr msg = msghdr();
+  msg.msg_iov = bufs;
+  msg.msg_iovlen = count;
+  int result = error_wrapper(::recvmsg(s, &msg, flags), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline int recvfrom(socket_type s, buf* bufs, size_t count, int flags,
+    socket_addr_type* addr, std::size_t* addrlen,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  // Receive some data.
+  DWORD recv_buf_count = static_cast<DWORD>(count);
+  DWORD bytes_transferred = 0;
+  DWORD recv_flags = flags;
+  int tmp_addrlen = (int)*addrlen;
+  int result = error_wrapper(::WSARecvFrom(s, bufs, recv_buf_count,
+        &bytes_transferred, &recv_flags, addr, &tmp_addrlen, 0, 0), ec);
+  *addrlen = (std::size_t)tmp_addrlen;
+  if (result != 0)
+    return -1;
+  clear_error(ec);
+  return bytes_transferred;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  msghdr msg = msghdr();
+  init_msghdr_msg_name(msg.msg_name, addr);
+  msg.msg_namelen = *addrlen;
+  msg.msg_iov = bufs;
+  msg.msg_iovlen = count;
+  int result = error_wrapper(::recvmsg(s, &msg, flags), ec);
+  *addrlen = msg.msg_namelen;
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline int send(socket_type s, const buf* bufs, size_t count, int flags,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  // Send the data.
+  DWORD send_buf_count = static_cast<DWORD>(count);
+  DWORD bytes_transferred = 0;
+  DWORD send_flags = flags;
+  int result = error_wrapper(::WSASend(s, const_cast<buf*>(bufs),
+        send_buf_count, &bytes_transferred, send_flags, 0, 0), ec);
+  if (result != 0)
+    return -1;
+  clear_error(ec);
+  return bytes_transferred;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  msghdr msg = msghdr();
+  msg.msg_iov = const_cast<buf*>(bufs);
+  msg.msg_iovlen = count;
+#if defined(__linux__)
+  flags |= MSG_NOSIGNAL;
+#endif // defined(__linux__)
+  int result = error_wrapper(::sendmsg(s, &msg, flags), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline int sendto(socket_type s, const buf* bufs, size_t count, int flags,
+    const socket_addr_type* addr, std::size_t addrlen,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  // Send the data.
+  DWORD send_buf_count = static_cast<DWORD>(count);
+  DWORD bytes_transferred = 0;
+  int result = error_wrapper(::WSASendTo(s, const_cast<buf*>(bufs),
+        send_buf_count, &bytes_transferred, flags, addr,
+        static_cast<int>(addrlen), 0, 0), ec);
+  if (result != 0)
+    return -1;
+  clear_error(ec);
+  return bytes_transferred;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  msghdr msg = msghdr();
+  init_msghdr_msg_name(msg.msg_name, addr);
+  msg.msg_namelen = addrlen;
+  msg.msg_iov = const_cast<buf*>(bufs);
+  msg.msg_iovlen = count;
+#if defined(__linux__)
+  flags |= MSG_NOSIGNAL;
+#endif // defined(__linux__)
+  int result = error_wrapper(::sendmsg(s, &msg, flags), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline socket_type socket(int af, int type, int protocol,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  socket_type s = error_wrapper(::WSASocket(af, type, protocol, 0, 0,
+        WSA_FLAG_OVERLAPPED), ec);
+  if (s == invalid_socket)
+    return s;
+
+  if (af == AF_INET6)
+  {
+    // Try to enable the POSIX default behaviour of having IPV6_V6ONLY set to
+    // false. This will only succeed on Windows Vista and later versions of
+    // Windows, where a dual-stack IPv4/v6 implementation is available.
+    DWORD optval = 0;
+    ::setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
+        reinterpret_cast<const char*>(&optval), sizeof(optval));
+  }
+
+  clear_error(ec);
+
+  return s;
+#elif defined(__MACH__) && defined(__APPLE__) || defined(__FreeBSD__)
+  socket_type s = error_wrapper(::socket(af, type, protocol), ec);
+  if (s == invalid_socket)
+    return s;
+
+  int optval = 1;
+  int result = error_wrapper(::setsockopt(s,
+        SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)), ec);
+  if (result != 0)
+  {
+    ::close(s);
+    return invalid_socket;
+  }
+
+  return s;
+#else
+  int s = error_wrapper(::socket(af, type, protocol), ec);
+  if (s >= 0)
+    clear_error(ec);
+  return s;
+#endif
+}
+
+template <typename SockLenType>
+inline int call_setsockopt(SockLenType msghdr::*,
+    socket_type s, int level, int optname,
+    const void* optval, std::size_t optlen)
+{
+  return ::setsockopt(s, level, optname,
+      (const char*)optval, (SockLenType)optlen);
+}
+
+inline int setsockopt(socket_type s, int level, int optname,
+    const void* optval, std::size_t optlen, asio::error_code& ec)
+{
+  if (level == custom_socket_option_level && optname == always_fail_option)
+  {
+    ec = asio::error::invalid_argument;
+    return -1;
+  }
+
+#if defined(__BORLANDC__)
+  // Mysteriously, using the getsockopt and setsockopt functions directly with
+  // Borland C++ results in incorrect values being set and read. The bug can be
+  // worked around by using function addresses resolved with GetProcAddress.
+  if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
+  {
+    typedef int (WSAAPI *sso_t)(SOCKET, int, int, const char*, int);
+    if (sso_t sso = (sso_t)::GetProcAddress(winsock_module, "setsockopt"))
+    {
+      clear_error(ec);
+      return error_wrapper(sso(s, level, optname,
+            reinterpret_cast<const char*>(optval),
+            static_cast<int>(optlen)), ec);
+    }
+  }
+  ec = asio::error::fault;
+  return -1;
+#else // defined(__BORLANDC__)
+  clear_error(ec);
+  int result = error_wrapper(call_setsockopt(&msghdr::msg_namelen,
+        s, level, optname, optval, optlen), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+#endif // defined(__BORLANDC__)
+}
+
+template <typename SockLenType>
+inline int call_getsockopt(SockLenType msghdr::*,
+    socket_type s, int level, int optname,
+    void* optval, std::size_t* optlen)
+{
+  SockLenType tmp_optlen = (SockLenType)*optlen;
+  int result = ::getsockopt(s, level, optname, (char*)optval, &tmp_optlen);
+  *optlen = (std::size_t)tmp_optlen;
+  return result;
+}
+
+inline int getsockopt(socket_type s, int level, int optname, void* optval,
+    size_t* optlen, asio::error_code& ec)
+{
+  if (level == custom_socket_option_level && optname == always_fail_option)
+  {
+    ec = asio::error::invalid_argument;
+    return -1;
+  }
+
+#if defined(__BORLANDC__)
+  // Mysteriously, using the getsockopt and setsockopt functions directly with
+  // Borland C++ results in incorrect values being set and read. The bug can be
+  // worked around by using function addresses resolved with GetProcAddress.
+  if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
+  {
+    typedef int (WSAAPI *gso_t)(SOCKET, int, int, char*, int*);
+    if (gso_t gso = (gso_t)::GetProcAddress(winsock_module, "getsockopt"))
+    {
+      clear_error(ec);
+      int tmp_optlen = static_cast<int>(*optlen);
+      int result = error_wrapper(gso(s, level, optname,
+            reinterpret_cast<char*>(optval), &tmp_optlen), ec);
+      *optlen = static_cast<size_t>(tmp_optlen);
+      if (result != 0 && level == IPPROTO_IPV6 && optname == IPV6_V6ONLY
+          && ec.value() == WSAENOPROTOOPT && *optlen == sizeof(DWORD))
+      {
+        // Dual-stack IPv4/v6 sockets, and the IPV6_V6ONLY socket option, are
+        // only supported on Windows Vista and later. To simplify program logic
+        // we will fake success of getting this option and specify that the
+        // value is non-zero (i.e. true). This corresponds to the behavior of
+        // IPv6 sockets on Windows platforms pre-Vista.
+        *static_cast<DWORD*>(optval) = 1;
+        clear_error(ec);
+      }
+      return result;
+    }
+  }
+  ec = asio::error::fault;
+  return -1;
+#elif defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  clear_error(ec);
+  int result = error_wrapper(call_getsockopt(&msghdr::msg_namelen,
+        s, level, optname, optval, optlen), ec);
+  if (result != 0 && level == IPPROTO_IPV6 && optname == IPV6_V6ONLY
+      && ec.value() == WSAENOPROTOOPT && *optlen == sizeof(DWORD))
+  {
+    // Dual-stack IPv4/v6 sockets, and the IPV6_V6ONLY socket option, are only
+    // supported on Windows Vista and later. To simplify program logic we will
+    // fake success of getting this option and specify that the value is
+    // non-zero (i.e. true). This corresponds to the behavior of IPv6 sockets
+    // on Windows platforms pre-Vista.
+    *static_cast<DWORD*>(optval) = 1;
+    clear_error(ec);
+  }
+  if (result == 0)
+    clear_error(ec);
+  return result;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  clear_error(ec);
+  int result = error_wrapper(call_getsockopt(&msghdr::msg_namelen,
+        s, level, optname, optval, optlen), ec);
+#if defined(__linux__)
+  if (result == 0 && level == SOL_SOCKET && *optlen == sizeof(int)
+      && (optname == SO_SNDBUF || optname == SO_RCVBUF))
+  {
+    // On Linux, setting SO_SNDBUF or SO_RCVBUF to N actually causes the kernel
+    // to set the buffer size to N*2. Linux puts additional stuff into the
+    // buffers so that only about half is actually available to the application.
+    // The retrieved value is divided by 2 here to make it appear as though the
+    // correct value has been set.
+    *static_cast<int*>(optval) /= 2;
+  }
+#endif // defined(__linux__)
+  if (result == 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+template <typename SockLenType>
+inline int call_getpeername(SockLenType msghdr::*,
+    socket_type s, socket_addr_type* addr, std::size_t* addrlen)
+{
+  SockLenType tmp_addrlen = (SockLenType)*addrlen;
+  int result = ::getpeername(s, addr, &tmp_addrlen);
+  *addrlen = (std::size_t)tmp_addrlen;
+  return result;
+}
+
+inline int getpeername(socket_type s, socket_addr_type* addr,
+    std::size_t* addrlen, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(call_getpeername(
+        &msghdr::msg_namelen, s, addr, addrlen), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+template <typename SockLenType>
+inline int call_getsockname(SockLenType msghdr::*,
+    socket_type s, socket_addr_type* addr, std::size_t* addrlen)
+{
+  SockLenType tmp_addrlen = (SockLenType)*addrlen;
+  int result = ::getsockname(s, addr, &tmp_addrlen);
+  *addrlen = (std::size_t)tmp_addrlen;
+  return result;
+}
+
+inline int getsockname(socket_type s, socket_addr_type* addr,
+    std::size_t* addrlen, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(call_getsockname(
+        &msghdr::msg_namelen, s, addr, addrlen), ec);
+  if (result == 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int ioctl(socket_type s, long cmd, ioctl_arg_type* arg,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  int result = error_wrapper(::ioctlsocket(s, cmd, arg), ec);
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  int result = error_wrapper(::ioctl(s, cmd, arg), ec);
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+}
+
+inline int select(int nfds, fd_set* readfds, fd_set* writefds,
+    fd_set* exceptfds, timeval* timeout, asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  if (!readfds && !writefds && !exceptfds && timeout)
+  {
+    DWORD milliseconds = timeout->tv_sec * 1000 + timeout->tv_usec / 1000;
+    if (milliseconds == 0)
+      milliseconds = 1; // Force context switch.
+    ::Sleep(milliseconds);
+    ec = asio::error_code();
+    return 0;
+  }
+
+  // The select() call allows timeout values measured in microseconds, but the
+  // system clock (as wrapped by boost::posix_time::microsec_clock) typically
+  // has a resolution of 10 milliseconds. This can lead to a spinning select
+  // reactor, meaning increased CPU usage, when waiting for the earliest
+  // scheduled timeout if it's less than 10 milliseconds away. To avoid a tight
+  // spin we'll use a minimum timeout of 1 millisecond.
+  if (timeout && timeout->tv_sec == 0
+      && timeout->tv_usec > 0 && timeout->tv_usec < 1000)
+    timeout->tv_usec = 1000;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#if defined(__hpux) && defined(__HP_aCC)
+  timespec ts;
+  ts.tv_sec = timeout ? timeout->tv_sec : 0;
+  ts.tv_nsec = timeout ? timeout->tv_usec * 1000 : 0;
+  return error_wrapper(::pselect(nfds, readfds,
+        writefds, exceptfds, timeout ? &ts : 0, 0), ec);
+#else
+  int result = error_wrapper(::select(nfds, readfds,
+        writefds, exceptfds, timeout), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif
+}
+
+inline int poll_read(socket_type s, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  FD_SET fds;
+  FD_ZERO(&fds);
+  FD_SET(s, &fds);
+  clear_error(ec);
+  int result = error_wrapper(::select(s, &fds, 0, 0, 0), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  pollfd fds;
+  fds.fd = s;
+  fds.events = POLLIN;
+  fds.revents = 0;
+  clear_error(ec);
+  int result = error_wrapper(::poll(&fds, 1, -1), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline int poll_write(socket_type s, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  FD_SET fds;
+  FD_ZERO(&fds);
+  FD_SET(s, &fds);
+  clear_error(ec);
+  int result = error_wrapper(::select(s, 0, &fds, 0, 0), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  pollfd fds;
+  fds.fd = s;
+  fds.events = POLLOUT;
+  fds.revents = 0;
+  clear_error(ec);
+  int result = error_wrapper(::poll(&fds, 1, -1), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline int poll_connect(socket_type s, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  FD_SET write_fds;
+  FD_ZERO(&write_fds);
+  FD_SET(s, &write_fds);
+  FD_SET except_fds;
+  FD_ZERO(&except_fds);
+  FD_SET(s, &except_fds);
+  clear_error(ec);
+  int result = error_wrapper(::select(s, 0, &write_fds, &except_fds, 0), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  pollfd fds;
+  fds.fd = s;
+  fds.events = POLLOUT;
+  fds.revents = 0;
+  clear_error(ec);
+  int result = error_wrapper(::poll(&fds, 1, -1), ec);
+  if (result >= 0)
+    clear_error(ec);
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline const char* inet_ntop(int af, const void* src, char* dest, size_t length,
+    unsigned long scope_id, asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  using namespace std; // For memcpy.
+
+  if (af != AF_INET && af != AF_INET6)
+  {
+    ec = asio::error::address_family_not_supported;
+    return 0;
+  }
+
+  union
+  {
+    socket_addr_type base;
+    sockaddr_storage_type storage;
+    sockaddr_in4_type v4;
+    sockaddr_in6_type v6;
+  } address;
+  DWORD address_length;
+  if (af == AF_INET)
+  {
+    address_length = sizeof(sockaddr_in4_type);
+    address.v4.sin_family = AF_INET;
+    address.v4.sin_port = 0;
+    memcpy(&address.v4.sin_addr, src, sizeof(in4_addr_type));
+  }
+  else // AF_INET6
+  {
+    address_length = sizeof(sockaddr_in6_type);
+    address.v6.sin6_family = AF_INET6;
+    address.v6.sin6_port = 0;
+    address.v6.sin6_flowinfo = 0;
+    address.v6.sin6_scope_id = scope_id;
+    memcpy(&address.v6.sin6_addr, src, sizeof(in6_addr_type));
+  }
+
+  DWORD string_length = static_cast<DWORD>(length);
+#if defined(BOOST_NO_ANSI_APIS)
+  LPWSTR string_buffer = (LPWSTR)_alloca(length * sizeof(WCHAR));
+  int result = error_wrapper(::WSAAddressToStringW(&address.base,
+        address_length, 0, string_buffer, &string_length), ec);
+  ::WideCharToMultiByte(CP_ACP, 0, string_buffer, -1, dest, length, 0, 0);
+#else
+  int result = error_wrapper(::WSAAddressToStringA(
+        &address.base, address_length, 0, dest, &string_length), ec);
+#endif
+
+  // Windows may set error code on success.
+  if (result != socket_error_retval)
+    clear_error(ec);
+
+  // Windows may not set an error code on failure.
+  else if (result == socket_error_retval && !ec)
+    ec = asio::error::invalid_argument;
+
+  return result == socket_error_retval ? 0 : dest;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  const char* result = error_wrapper(::inet_ntop(af, src, dest, length), ec);
+  if (result == 0 && !ec)
+    ec = asio::error::invalid_argument;
+  if (result != 0 && af == AF_INET6 && scope_id != 0)
+  {
+    using namespace std; // For strcat and sprintf.
+    char if_name[IF_NAMESIZE + 1] = "%";
+    const in6_addr_type* ipv6_address = static_cast<const in6_addr_type*>(src);
+    bool is_link_local = IN6_IS_ADDR_LINKLOCAL(ipv6_address);
+    if (!is_link_local || if_indextoname(scope_id, if_name + 1) == 0)
+      sprintf(if_name + 1, "%lu", scope_id);
+    strcat(dest, if_name);
+  }
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline int inet_pton(int af, const char* src, void* dest,
+    unsigned long* scope_id, asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  using namespace std; // For memcpy and strcmp.
+
+  if (af != AF_INET && af != AF_INET6)
+  {
+    ec = asio::error::address_family_not_supported;
+    return -1;
+  }
+
+  union
+  {
+    socket_addr_type base;
+    sockaddr_storage_type storage;
+    sockaddr_in4_type v4;
+    sockaddr_in6_type v6;
+  } address;
+  int address_length = sizeof(sockaddr_storage_type);
+#if defined(BOOST_NO_ANSI_APIS)
+  int num_wide_chars = strlen(src) + 1;
+  LPWSTR wide_buffer = (LPWSTR)_alloca(num_wide_chars * sizeof(WCHAR));
+  ::MultiByteToWideChar(CP_ACP, 0, src, -1, wide_buffer, num_wide_chars);
+  int result = error_wrapper(::WSAStringToAddressW(
+        wide_buffer, af, 0, &address.base, &address_length), ec);
+#else
+  int result = error_wrapper(::WSAStringToAddressA(
+        const_cast<char*>(src), af, 0, &address.base, &address_length), ec);
+#endif
+
+  if (af == AF_INET)
+  {
+    if (result != socket_error_retval)
+    {
+      memcpy(dest, &address.v4.sin_addr, sizeof(in4_addr_type));
+      clear_error(ec);
+    }
+    else if (strcmp(src, "255.255.255.255") == 0)
+    {
+      static_cast<in4_addr_type*>(dest)->s_addr = INADDR_NONE;
+      clear_error(ec);
+    }
+  }
+  else // AF_INET6
+  {
+    if (result != socket_error_retval)
+    {
+      memcpy(dest, &address.v6.sin6_addr, sizeof(in6_addr_type));
+      if (scope_id)
+        *scope_id = address.v6.sin6_scope_id;
+      clear_error(ec);
+    }
+  }
+
+  // Windows may not set an error code on failure.
+  if (result == socket_error_retval && !ec)
+    ec = asio::error::invalid_argument;
+
+  if (result != socket_error_retval)
+    clear_error(ec);
+
+  return result == socket_error_retval ? -1 : 1;
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  int result = error_wrapper(::inet_pton(af, src, dest), ec);
+  if (result <= 0 && !ec)
+    ec = asio::error::invalid_argument;
+  if (result > 0 && af == AF_INET6 && scope_id)
+  {
+    using namespace std; // For strchr and atoi.
+    *scope_id = 0;
+    if (const char* if_name = strchr(src, '%'))
+    {
+      in6_addr_type* ipv6_address = static_cast<in6_addr_type*>(dest);
+      bool is_link_local = IN6_IS_ADDR_LINKLOCAL(ipv6_address);
+      if (is_link_local)
+        *scope_id = if_nametoindex(if_name + 1);
+      if (*scope_id == 0)
+        *scope_id = atoi(if_name + 1);
+    }
+  }
+  return result;
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+}
+
+inline int gethostname(char* name, int namelen, asio::error_code& ec)
+{
+  clear_error(ec);
+  int result = error_wrapper(::gethostname(name, namelen), ec);
+#if defined(BOOST_WINDOWS)
+  if (result == 0)
+    clear_error(ec);
+#endif
+  return result;
+}
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__) \
+  || defined(__MACH__) && defined(__APPLE__)
+
+// The following functions are only needed for emulation of getaddrinfo and
+// getnameinfo.
+
+inline asio::error_code translate_netdb_error(int error)
+{
+  switch (error)
+  {
+  case 0:
+    return asio::error_code();
+  case HOST_NOT_FOUND:
+    return asio::error::host_not_found;
+  case TRY_AGAIN:
+    return asio::error::host_not_found_try_again;
+  case NO_RECOVERY:
+    return asio::error::no_recovery;
+  case NO_DATA:
+    return asio::error::no_data;
+  default:
+    BOOST_ASSERT(false);
+    return asio::error::invalid_argument;
+  }
+}
+
+inline hostent* gethostbyaddr(const char* addr, int length, int af,
+    hostent* result, char* buffer, int buflength, asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  (void)(buffer);
+  (void)(buflength);
+  hostent* retval = error_wrapper(::gethostbyaddr(addr, length, af), ec);
+  if (!retval)
+    return 0;
+  clear_error(ec);
+  *result = *retval;
+  return retval;
+#elif defined(__sun) || defined(__QNX__)
+  int error = 0;
+  hostent* retval = error_wrapper(::gethostbyaddr_r(addr, length, af, result,
+        buffer, buflength, &error), ec);
+  if (error)
+    ec = translate_netdb_error(error);
+  return retval;
+#elif defined(__MACH__) && defined(__APPLE__)
+  (void)(buffer);
+  (void)(buflength);
+  int error = 0;
+  hostent* retval = error_wrapper(::getipnodebyaddr(
+        addr, length, af, &error), ec);
+  if (error)
+    ec = translate_netdb_error(error);
+  if (!retval)
+    return 0;
+  *result = *retval;
+  return retval;
+#else
+  hostent* retval = 0;
+  int error = 0;
+  error_wrapper(::gethostbyaddr_r(addr, length, af, result, buffer,
+        buflength, &retval, &error), ec);
+  if (error)
+    ec = translate_netdb_error(error);
+  return retval;
+#endif
+}
+
+inline hostent* gethostbyname(const char* name, int af, struct hostent* result,
+    char* buffer, int buflength, int ai_flags, asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  (void)(buffer);
+  (void)(buflength);
+  (void)(ai_flags);
+  if (af != AF_INET)
+  {
+    ec = asio::error::address_family_not_supported;
+    return 0;
+  }
+  hostent* retval = error_wrapper(::gethostbyname(name), ec);
+  if (!retval)
+    return 0;
+  clear_error(ec);
+  *result = *retval;
+  return result;
+#elif defined(__sun) || defined(__QNX__)
+  (void)(ai_flags);
+  if (af != AF_INET)
+  {
+    ec = asio::error::address_family_not_supported;
+    return 0;
+  }
+  int error = 0;
+  hostent* retval = error_wrapper(::gethostbyname_r(name, result, buffer,
+        buflength, &error), ec);
+  if (error)
+    ec = translate_netdb_error(error);
+  return retval;
+#elif defined(__MACH__) && defined(__APPLE__)
+  (void)(buffer);
+  (void)(buflength);
+  int error = 0;
+  hostent* retval = error_wrapper(::getipnodebyname(
+        name, af, ai_flags, &error), ec);
+  if (error)
+    ec = translate_netdb_error(error);
+  if (!retval)
+    return 0;
+  *result = *retval;
+  return retval;
+#else
+  (void)(ai_flags);
+  if (af != AF_INET)
+  {
+    ec = asio::error::address_family_not_supported;
+    return 0;
+  }
+  hostent* retval = 0;
+  int error = 0;
+  error_wrapper(::gethostbyname_r(name, result,
+        buffer, buflength, &retval, &error), ec);
+  if (error)
+    ec = translate_netdb_error(error);
+  return retval;
+#endif
+}
+
+inline void freehostent(hostent* h)
+{
+#if defined(__MACH__) && defined(__APPLE__)
+  if (h)
+    ::freehostent(h);
+#else
+  (void)(h);
+#endif
+}
+
+// Emulation of getaddrinfo based on implementation in:
+// Stevens, W. R., UNIX Network Programming Vol. 1, 2nd Ed., Prentice-Hall 1998.
+
+struct gai_search
+{
+  const char* host;
+  int family;
+};
+
+inline int gai_nsearch(const char* host,
+    const addrinfo_type* hints, gai_search (&search)[2])
+{
+  int search_count = 0;
+  if (host == 0 || host[0] == '\0')
+  {
+    if (hints->ai_flags & AI_PASSIVE)
+    {
+      // No host and AI_PASSIVE implies wildcard bind.
+      switch (hints->ai_family)
+      {
+      case AF_INET:
+        search[search_count].host = "0.0.0.0";
+        search[search_count].family = AF_INET;
+        ++search_count;
+        break;
+      case AF_INET6:
+        search[search_count].host = "0::0";
+        search[search_count].family = AF_INET6;
+        ++search_count;
+        break;
+      case AF_UNSPEC:
+        search[search_count].host = "0::0";
+        search[search_count].family = AF_INET6;
+        ++search_count;
+        search[search_count].host = "0.0.0.0";
+        search[search_count].family = AF_INET;
+        ++search_count;
+        break;
+      default:
+        break;
+      }
+    }
+    else
+    {
+      // No host and not AI_PASSIVE means connect to local host.
+      switch (hints->ai_family)
+      {
+      case AF_INET:
+        search[search_count].host = "localhost";
+        search[search_count].family = AF_INET;
+        ++search_count;
+        break;
+      case AF_INET6:
+        search[search_count].host = "localhost";
+        search[search_count].family = AF_INET6;
+        ++search_count;
+        break;
+      case AF_UNSPEC:
+        search[search_count].host = "localhost";
+        search[search_count].family = AF_INET6;
+        ++search_count;
+        search[search_count].host = "localhost";
+        search[search_count].family = AF_INET;
+        ++search_count;
+        break;
+      default:
+        break;
+      }
+    }
+  }
+  else
+  {
+    // Host is specified.
+    switch (hints->ai_family)
+    {
+    case AF_INET:
+      search[search_count].host = host;
+      search[search_count].family = AF_INET;
+      ++search_count;
+      break;
+    case AF_INET6:
+      search[search_count].host = host;
+      search[search_count].family = AF_INET6;
+      ++search_count;
+      break;
+    case AF_UNSPEC:
+      search[search_count].host = host;
+      search[search_count].family = AF_INET6;
+      ++search_count;
+      search[search_count].host = host;
+      search[search_count].family = AF_INET;
+      ++search_count;
+      break;
+    default:
+      break;
+    }
+  }
+  return search_count;
+}
+
+template <typename T>
+inline T* gai_alloc(std::size_t size = sizeof(T))
+{
+  using namespace std;
+  T* p = static_cast<T*>(::operator new(size, std::nothrow));
+  if (p)
+    memset(p, 0, size);
+  return p;
+}
+
+inline void gai_free(void* p)
+{
+  ::operator delete(p);
+}
+
+inline void gai_strcpy(char* target, const char* source, std::size_t max_size)
+{
+  using namespace std;
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) && !defined(UNDER_CE)
+  strcpy_s(target, max_size, source);
+#else
+  *target = 0;
+  strncat(target, source, max_size);
+#endif
+}
+
+enum { gai_clone_flag = 1 << 30 };
+
+inline int gai_aistruct(addrinfo_type*** next, const addrinfo_type* hints,
+    const void* addr, int family)
+{
+  using namespace std;
+
+  addrinfo_type* ai = gai_alloc<addrinfo_type>();
+  if (ai == 0)
+    return EAI_MEMORY;
+
+  ai->ai_next = 0;
+  **next = ai;
+  *next = &ai->ai_next;
+
+  ai->ai_canonname = 0;
+  ai->ai_socktype = hints->ai_socktype;
+  if (ai->ai_socktype == 0)
+    ai->ai_flags |= gai_clone_flag;
+  ai->ai_protocol = hints->ai_protocol;
+  ai->ai_family = family;
+
+  switch (ai->ai_family)
+  {
+  case AF_INET:
+    {
+      sockaddr_in4_type* sinptr = gai_alloc<sockaddr_in4_type>();
+      if (sinptr == 0)
+        return EAI_MEMORY;
+      sinptr->sin_family = AF_INET;
+      memcpy(&sinptr->sin_addr, addr, sizeof(in4_addr_type));
+      ai->ai_addr = reinterpret_cast<sockaddr*>(sinptr);
+      ai->ai_addrlen = sizeof(sockaddr_in4_type);
+      break;
+    }
+  case AF_INET6:
+    {
+      sockaddr_in6_type* sin6ptr = gai_alloc<sockaddr_in6_type>();
+      if (sin6ptr == 0)
+        return EAI_MEMORY;
+      sin6ptr->sin6_family = AF_INET6;
+      memcpy(&sin6ptr->sin6_addr, addr, sizeof(in6_addr_type));
+      ai->ai_addr = reinterpret_cast<sockaddr*>(sin6ptr);
+      ai->ai_addrlen = sizeof(sockaddr_in6_type);
+      break;
+    }
+  default:
+    break;
+  }
+
+  return 0;
+}
+
+inline addrinfo_type* gai_clone(addrinfo_type* ai)
+{
+  using namespace std;
+
+  addrinfo_type* new_ai = gai_alloc<addrinfo_type>();
+  if (new_ai == 0)
+    return new_ai;
+
+  new_ai->ai_next = ai->ai_next;
+  ai->ai_next = new_ai;
+
+  new_ai->ai_flags = 0;
+  new_ai->ai_family = ai->ai_family;
+  new_ai->ai_socktype = ai->ai_socktype;
+  new_ai->ai_protocol = ai->ai_protocol;
+  new_ai->ai_canonname = 0;
+  new_ai->ai_addrlen = ai->ai_addrlen;
+  new_ai->ai_addr = gai_alloc<sockaddr>(ai->ai_addrlen);
+  memcpy(new_ai->ai_addr, ai->ai_addr, ai->ai_addrlen);
+
+  return new_ai;
+}
+
+inline int gai_port(addrinfo_type* aihead, int port, int socktype)
+{
+  int num_found = 0;
+
+  for (addrinfo_type* ai = aihead; ai; ai = ai->ai_next)
+  {
+    if (ai->ai_flags & gai_clone_flag)
+    {
+      if (ai->ai_socktype != 0)
+      {
+        ai = gai_clone(ai);
+        if (ai == 0)
+          return -1;
+        // ai now points to newly cloned entry.
+      }
+    }
+    else if (ai->ai_socktype != socktype)
+    {
+      // Ignore if mismatch on socket type.
+      continue;
+    }
+
+    ai->ai_socktype = socktype;
+
+    switch (ai->ai_family)
+    {
+    case AF_INET:
+      {
+        sockaddr_in4_type* sinptr =
+          reinterpret_cast<sockaddr_in4_type*>(ai->ai_addr);
+        sinptr->sin_port = port;
+        ++num_found;
+        break;
+      }
+    case AF_INET6:
+      {
+        sockaddr_in6_type* sin6ptr =
+          reinterpret_cast<sockaddr_in6_type*>(ai->ai_addr);
+        sin6ptr->sin6_port = port;
+        ++num_found;
+        break;
+      }
+    default:
+      break;
+    }
+  }
+
+  return num_found;
+}
+
+inline int gai_serv(addrinfo_type* aihead,
+    const addrinfo_type* hints, const char* serv)
+{
+  using namespace std;
+
+  int num_found = 0;
+
+  if (
+#if defined(AI_NUMERICSERV)
+      (hints->ai_flags & AI_NUMERICSERV) ||
+#endif
+      isdigit(serv[0]))
+  {
+    int port = htons(atoi(serv));
+    if (hints->ai_socktype)
+    {
+      // Caller specifies socket type.
+      int rc = gai_port(aihead, port, hints->ai_socktype);
+      if (rc < 0)
+        return EAI_MEMORY;
+      num_found += rc;
+    }
+    else
+    {
+      // Caller does not specify socket type.
+      int rc = gai_port(aihead, port, SOCK_STREAM);
+      if (rc < 0)
+        return EAI_MEMORY;
+      num_found += rc;
+      rc = gai_port(aihead, port, SOCK_DGRAM);
+      if (rc < 0)
+        return EAI_MEMORY;
+      num_found += rc;
+    }
+  }
+  else
+  {
+    // Try service name with TCP first, then UDP.
+    if (hints->ai_socktype == 0 || hints->ai_socktype == SOCK_STREAM)
+    {
+      servent* sptr = getservbyname(serv, "tcp");
+      if (sptr != 0)
+      {
+        int rc = gai_port(aihead, sptr->s_port, SOCK_STREAM);
+        if (rc < 0)
+          return EAI_MEMORY;
+        num_found += rc;
+      }
+    }
+    if (hints->ai_socktype == 0 || hints->ai_socktype == SOCK_DGRAM)
+    {
+      servent* sptr = getservbyname(serv, "udp");
+      if (sptr != 0)
+      {
+        int rc = gai_port(aihead, sptr->s_port, SOCK_DGRAM);
+        if (rc < 0)
+          return EAI_MEMORY;
+        num_found += rc;
+      }
+    }
+  }
+
+  if (num_found == 0)
+  {
+    if (hints->ai_socktype == 0)
+    {
+      // All calls to getservbyname() failed.
+      return EAI_NONAME;
+    }
+    else
+    {
+      // Service not supported for socket type.
+      return EAI_SERVICE;
+    }
+  }
+
+  return 0;
+}
+
+inline int gai_echeck(const char* host, const char* service,
+    int flags, int family, int socktype, int protocol)
+{
+  (void)(flags);
+  (void)(protocol);
+
+  // Host or service must be specified.
+  if (host == 0 || host[0] == '\0')
+    if (service == 0 || service[0] == '\0')
+      return EAI_NONAME;
+
+  // Check combination of family and socket type.
+  switch (family)
+  {
+  case AF_UNSPEC:
+    break;
+  case AF_INET:
+  case AF_INET6:
+    if (service != 0 && service[0] != '\0')
+      if (socktype != 0 && socktype != SOCK_STREAM && socktype != SOCK_DGRAM)
+        return EAI_SOCKTYPE;
+    break;
+  default:
+    return EAI_FAMILY;
+  }
+
+  return 0;
+}
+
+inline void freeaddrinfo_emulation(addrinfo_type* aihead)
+{
+  addrinfo_type* ai = aihead;
+  while (ai)
+  {
+    gai_free(ai->ai_addr);
+    gai_free(ai->ai_canonname);
+    addrinfo_type* ainext = ai->ai_next;
+    gai_free(ai);
+    ai = ainext;
+  }
+}
+
+inline int getaddrinfo_emulation(const char* host, const char* service,
+    const addrinfo_type* hintsp, addrinfo_type** result)
+{
+  // Set up linked list of addrinfo structures.
+  addrinfo_type* aihead = 0;
+  addrinfo_type** ainext = &aihead;
+  char* canon = 0;
+
+  // Supply default hints if not specified by caller.
+  addrinfo_type hints = addrinfo_type();
+  hints.ai_family = AF_UNSPEC;
+  if (hintsp)
+    hints = *hintsp;
+
+  // If the resolution is not specifically for AF_INET6, remove the AI_V4MAPPED
+  // and AI_ALL flags.
+#if defined(AI_V4MAPPED)
+  if (hints.ai_family != AF_INET6)
+    hints.ai_flags &= ~AI_V4MAPPED;
+#endif
+#if defined(AI_ALL)
+  if (hints.ai_family != AF_INET6)
+    hints.ai_flags &= ~AI_ALL;
+#endif
+
+  // Basic error checking.
+  int rc = gai_echeck(host, service, hints.ai_flags, hints.ai_family,
+      hints.ai_socktype, hints.ai_protocol);
+  if (rc != 0)
+  {
+    freeaddrinfo_emulation(aihead);
+    return rc;
+  }
+
+  gai_search search[2];
+  int search_count = gai_nsearch(host, &hints, search);
+  for (gai_search* sptr = search; sptr < search + search_count; ++sptr)
+  {
+    // Check for IPv4 dotted decimal string.
+    in4_addr_type inaddr;
+    asio::error_code ec;
+    if (socket_ops::inet_pton(AF_INET, sptr->host, &inaddr, 0, ec) == 1)
+    {
+      if (hints.ai_family != AF_UNSPEC && hints.ai_family != AF_INET)
+      {
+        freeaddrinfo_emulation(aihead);
+        gai_free(canon);
+        return EAI_FAMILY;
+      }
+      if (sptr->family == AF_INET)
+      {
+        rc = gai_aistruct(&ainext, &hints, &inaddr, AF_INET);
+        if (rc != 0)
+        {
+          freeaddrinfo_emulation(aihead);
+          gai_free(canon);
+          return rc;
+        }
+      }
+      continue;
+    }
+
+    // Check for IPv6 hex string.
+    in6_addr_type in6addr;
+    if (socket_ops::inet_pton(AF_INET6, sptr->host, &in6addr, 0, ec) == 1)
+    {
+      if (hints.ai_family != AF_UNSPEC && hints.ai_family != AF_INET6)
+      {
+        freeaddrinfo_emulation(aihead);
+        gai_free(canon);
+        return EAI_FAMILY;
+      }
+      if (sptr->family == AF_INET6)
+      {
+        rc = gai_aistruct(&ainext, &hints, &in6addr, AF_INET6);
+        if (rc != 0)
+        {
+          freeaddrinfo_emulation(aihead);
+          gai_free(canon);
+          return rc;
+        }
+      }
+      continue;
+    }
+
+    // Look up hostname.
+    hostent hent;
+    char hbuf[8192] = "";
+    hostent* hptr = socket_ops::gethostbyname(sptr->host,
+        sptr->family, &hent, hbuf, sizeof(hbuf), hints.ai_flags, ec);
+    if (hptr == 0)
+    {
+      if (search_count == 2)
+      {
+        // Failure is OK if there are multiple searches.
+        continue;
+      }
+      freeaddrinfo_emulation(aihead);
+      gai_free(canon);
+      if (ec == asio::error::host_not_found)
+        return EAI_NONAME;
+      if (ec == asio::error::host_not_found_try_again)
+        return EAI_AGAIN;
+      if (ec == asio::error::no_recovery)
+        return EAI_FAIL;
+      if (ec == asio::error::no_data)
+        return EAI_NONAME;
+      return EAI_NONAME;
+    }
+
+    // Check for address family mismatch if one was specified.
+    if (hints.ai_family != AF_UNSPEC && hints.ai_family != hptr->h_addrtype)
+    {
+      freeaddrinfo_emulation(aihead);
+      gai_free(canon);
+      socket_ops::freehostent(hptr);
+      return EAI_FAMILY;
+    }
+
+    // Save canonical name first time.
+    if (host != 0 && host[0] != '\0' && hptr->h_name && hptr->h_name[0]
+        && (hints.ai_flags & AI_CANONNAME) && canon == 0)
+    {
+      std::size_t canon_len = strlen(hptr->h_name) + 1;
+      canon = gai_alloc<char>(canon_len);
+      if (canon == 0)
+      {
+        freeaddrinfo_emulation(aihead);
+        socket_ops::freehostent(hptr);
+        return EAI_MEMORY;
+      }
+      gai_strcpy(canon, hptr->h_name, canon_len);
+    }
+
+    // Create an addrinfo structure for each returned address.
+    for (char** ap = hptr->h_addr_list; *ap; ++ap)
+    {
+      rc = gai_aistruct(&ainext, &hints, *ap, hptr->h_addrtype);
+      if (rc != 0)
+      {
+        freeaddrinfo_emulation(aihead);
+        gai_free(canon);
+        socket_ops::freehostent(hptr);
+        return EAI_FAMILY;
+      }
+    }
+
+    socket_ops::freehostent(hptr);
+  }
+
+  // Check if we found anything.
+  if (aihead == 0)
+  {
+    gai_free(canon);
+    return EAI_NONAME;
+  }
+
+  // Return canonical name in first entry.
+  if (host != 0 && host[0] != '\0' && (hints.ai_flags & AI_CANONNAME))
+  {
+    if (canon)
+    {
+      aihead->ai_canonname = canon;
+      canon = 0;
+    }
+    else
+    {
+      std::size_t canonname_len = strlen(search[0].host) + 1;
+      aihead->ai_canonname = gai_alloc<char>(canonname_len);
+      if (aihead->ai_canonname == 0)
+      {
+        freeaddrinfo_emulation(aihead);
+        return EAI_MEMORY;
+      }
+      gai_strcpy(aihead->ai_canonname, search[0].host, canonname_len);
+    }
+  }
+  gai_free(canon);
+
+  // Process the service name.
+  if (service != 0 && service[0] != '\0')
+  {
+    rc = gai_serv(aihead, &hints, service);
+    if (rc != 0)
+    {
+      freeaddrinfo_emulation(aihead);
+      return rc;
+    }
+  }
+
+  // Return result to caller.
+  *result = aihead;
+  return 0;
+}
+
+inline asio::error_code getnameinfo_emulation(
+    const socket_addr_type* sa, std::size_t salen, char* host,
+    std::size_t hostlen, char* serv, std::size_t servlen, int flags,
+    asio::error_code& ec)
+{
+  using namespace std;
+
+  const char* addr;
+  size_t addr_len;
+  unsigned short port;
+  switch (sa->sa_family)
+  {
+  case AF_INET:
+    if (salen != sizeof(sockaddr_in4_type))
+    {
+      return ec = asio::error::invalid_argument;
+    }
+    addr = reinterpret_cast<const char*>(
+        &reinterpret_cast<const sockaddr_in4_type*>(sa)->sin_addr);
+    addr_len = sizeof(in4_addr_type);
+    port = reinterpret_cast<const sockaddr_in4_type*>(sa)->sin_port;
+    break;
+  case AF_INET6:
+    if (salen != sizeof(sockaddr_in6_type))
+    {
+      return ec = asio::error::invalid_argument;
+    }
+    addr = reinterpret_cast<const char*>(
+        &reinterpret_cast<const sockaddr_in6_type*>(sa)->sin6_addr);
+    addr_len = sizeof(in6_addr_type);
+    port = reinterpret_cast<const sockaddr_in6_type*>(sa)->sin6_port;
+    break;
+  default:
+    return ec = asio::error::address_family_not_supported;
+  }
+
+  if (host && hostlen > 0)
+  {
+    if (flags & NI_NUMERICHOST)
+    {
+      if (socket_ops::inet_ntop(sa->sa_family, addr, host, hostlen, 0, ec) == 0)
+      {
+        return ec;
+      }
+    }
+    else
+    {
+      hostent hent;
+      char hbuf[8192] = "";
+      hostent* hptr = socket_ops::gethostbyaddr(addr,
+          static_cast<int>(addr_len), sa->sa_family,
+          &hent, hbuf, sizeof(hbuf), ec);
+      if (hptr && hptr->h_name && hptr->h_name[0] != '\0')
+      {
+        if (flags & NI_NOFQDN)
+        {
+          char* dot = strchr(hptr->h_name, '.');
+          if (dot)
+          {
+            *dot = 0;
+          }
+        }
+        gai_strcpy(host, hptr->h_name, hostlen);
+        socket_ops::freehostent(hptr);
+      }
+      else
+      {
+        socket_ops::freehostent(hptr);
+        if (flags & NI_NAMEREQD)
+        {
+          return ec = asio::error::host_not_found;
+        }
+        if (socket_ops::inet_ntop(sa->sa_family,
+              addr, host, hostlen, 0, ec) == 0)
+        {
+          return ec;
+        }
+      }
+    }
+  }
+
+  if (serv && servlen > 0)
+  {
+    if (flags & NI_NUMERICSERV)
+    {
+      if (servlen < 6)
+      {
+        return ec = asio::error::no_buffer_space;
+      }
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) && !defined(UNDER_CE)
+      sprintf_s(serv, servlen, "%u", ntohs(port));
+#else
+      sprintf(serv, "%u", ntohs(port));
+#endif
+    }
+    else
+    {
+#if defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
+      static ::pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+      ::pthread_mutex_lock(&mutex);
+#endif // defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
+      servent* sptr = ::getservbyport(port, (flags & NI_DGRAM) ? "udp" : 0);
+      if (sptr && sptr->s_name && sptr->s_name[0] != '\0')
+      {
+        gai_strcpy(serv, sptr->s_name, servlen);
+      }
+      else
+      {
+        if (servlen < 6)
+        {
+          return ec = asio::error::no_buffer_space;
+        }
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) && !defined(UNDER_CE)
+        sprintf_s(serv, servlen, "%u", ntohs(port));
+#else
+        sprintf(serv, "%u", ntohs(port));
+#endif
+      }
+#if defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
+      ::pthread_mutex_unlock(&mutex);
+#endif // defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
+    }
+  }
+
+  clear_error(ec);
+  return ec;
+}
+
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+       //   || defined(__MACH__) && defined(__APPLE__)
+
+inline asio::error_code translate_addrinfo_error(int error)
+{
+  switch (error)
+  {
+  case 0:
+    return asio::error_code();
+  case EAI_AGAIN:
+    return asio::error::host_not_found_try_again;
+  case EAI_BADFLAGS:
+    return asio::error::invalid_argument;
+  case EAI_FAIL:
+    return asio::error::no_recovery;
+  case EAI_FAMILY:
+    return asio::error::address_family_not_supported;
+  case EAI_MEMORY:
+    return asio::error::no_memory;
+  case EAI_NONAME:
+#if defined(EAI_ADDRFAMILY)
+  case EAI_ADDRFAMILY:
+#endif
+#if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
+  case EAI_NODATA:
+#endif
+    return asio::error::host_not_found;
+  case EAI_SERVICE:
+    return asio::error::service_not_found;
+  case EAI_SOCKTYPE:
+    return asio::error::socket_type_not_supported;
+  default: // Possibly the non-portable EAI_SYSTEM.
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+    return asio::error_code(
+        WSAGetLastError(), asio::error::get_system_category());
+#else
+    return asio::error_code(
+        errno, asio::error::get_system_category());
+#endif
+  }
+}
+
+inline asio::error_code getaddrinfo(const char* host,
+    const char* service, const addrinfo_type* hints, addrinfo_type** result,
+    asio::error_code& ec)
+{
+  clear_error(ec);
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501) || defined(UNDER_CE)
+  // Building for Windows XP, Windows Server 2003, or later.
+  int error = ::getaddrinfo(host, service, hints, result);
+  return ec = translate_addrinfo_error(error);
+# else
+  // Building for Windows 2000 or earlier.
+  typedef int (WSAAPI *gai_t)(const char*,
+      const char*, const addrinfo_type*, addrinfo_type**);
+  if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
+  {
+    if (gai_t gai = (gai_t)::GetProcAddress(winsock_module, "getaddrinfo"))
+    {
+      int error = gai(host, service, hints, result);
+      return ec = translate_addrinfo_error(error);
+    }
+  }
+  int error = getaddrinfo_emulation(host, service, hints, result);
+  return ec = translate_addrinfo_error(error);
+# endif
+#elif defined(__MACH__) && defined(__APPLE__)
+  int error = getaddrinfo_emulation(host, service, hints, result);
+  return ec = translate_addrinfo_error(error);
+#else
+  int error = ::getaddrinfo(host, service, hints, result);
+  return ec = translate_addrinfo_error(error);
+#endif
+}
+
+inline void freeaddrinfo(addrinfo_type* ai)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501) || defined(UNDER_CE)
+  // Building for Windows XP, Windows Server 2003, or later.
+  ::freeaddrinfo(ai);
+# else
+  // Building for Windows 2000 or earlier.
+  typedef int (WSAAPI *fai_t)(addrinfo_type*);
+  if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
+  {
+    if (fai_t fai = (fai_t)::GetProcAddress(winsock_module, "freeaddrinfo"))
+    {
+      fai(ai);
+      return;
+    }
+  }
+  freeaddrinfo_emulation(ai);
+# endif
+#elif defined(__MACH__) && defined(__APPLE__)
+  freeaddrinfo_emulation(ai);
+#else
+  ::freeaddrinfo(ai);
+#endif
+}
+
+inline asio::error_code getnameinfo(const socket_addr_type* addr,
+    std::size_t addrlen, char* host, std::size_t hostlen,
+    char* serv, std::size_t servlen, int flags, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501) || defined(UNDER_CE)
+  // Building for Windows XP, Windows Server 2003, or later.
+  clear_error(ec);
+  int error = ::getnameinfo(addr, static_cast<socklen_t>(addrlen),
+      host, static_cast<DWORD>(hostlen),
+      serv, static_cast<DWORD>(servlen), flags);
+  return ec = translate_addrinfo_error(error);
+# else
+  // Building for Windows 2000 or earlier.
+  typedef int (WSAAPI *gni_t)(const socket_addr_type*,
+      int, char*, DWORD, char*, DWORD, int);
+  if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
+  {
+    if (gni_t gni = (gni_t)::GetProcAddress(winsock_module, "getnameinfo"))
+    {
+      clear_error(ec);
+      int error = gni(addr, static_cast<int>(addrlen),
+          host, static_cast<DWORD>(hostlen),
+          serv, static_cast<DWORD>(servlen), flags);
+      return ec = translate_addrinfo_error(error);
+    }
+  }
+  clear_error(ec);
+  return getnameinfo_emulation(addr, addrlen,
+      host, hostlen, serv, servlen, flags, ec);
+# endif
+#elif defined(__MACH__) && defined(__APPLE__)
+  using namespace std; // For memcpy.
+  sockaddr_storage_type tmp_addr;
+  memcpy(&tmp_addr, addr, addrlen);
+  tmp_addr.ss_len = addrlen;
+  addr = reinterpret_cast<socket_addr_type*>(&tmp_addr);
+  clear_error(ec);
+  return getnameinfo_emulation(addr, addrlen,
+      host, hostlen, serv, servlen, flags, ec);
+#else
+  clear_error(ec);
+  int error = ::getnameinfo(addr, addrlen, host, hostlen, serv, servlen, flags);
+  return ec = translate_addrinfo_error(error);
+#endif
+}
+
+inline u_long_type network_to_host_long(u_long_type value)
+{
+  return ntohl(value);
+}
+
+inline u_long_type host_to_network_long(u_long_type value)
+{
+  return htonl(value);
+}
+
+inline u_short_type network_to_host_short(u_short_type value)
+{
+  return ntohs(value);
+}
+
+inline u_short_type host_to_network_short(u_short_type value)
+{
+  return htons(value);
+}
+
+} // namespace socket_ops
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SOCKET_OPS_HPP
diff --git a/ext/asio/detail/socket_option.hpp b/ext/asio/detail/socket_option.hpp
new file mode 100644
index 0000000000..ac070b7018
--- /dev/null
+++ b/ext/asio/detail/socket_option.hpp
@@ -0,0 +1,319 @@
+//
+// socket_option.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SOCKET_OPTION_HPP
+#define ASIO_DETAIL_SOCKET_OPTION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <stdexcept>
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+namespace socket_option {
+
+// Helper template for implementing boolean-based options.
+template <int Level, int Name>
+class boolean
+{
+public:
+  // Default constructor.
+  boolean()
+    : value_(0)
+  {
+  }
+
+  // Construct with a specific option value.
+  explicit boolean(bool v)
+    : value_(v ? 1 : 0)
+  {
+  }
+
+  // Set the current value of the boolean.
+  boolean& operator=(bool v)
+  {
+    value_ = v ? 1 : 0;
+    return *this;
+  }
+
+  // Get the current value of the boolean.
+  bool value() const
+  {
+    return !!value_;
+  }
+
+  // Convert to bool.
+  operator bool() const
+  {
+    return !!value_;
+  }
+
+  // Test for false.
+  bool operator!() const
+  {
+    return !value_;
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol&) const
+  {
+    return Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol&) const
+  {
+    return Name;
+  }
+
+  // Get the address of the boolean data.
+  template <typename Protocol>
+  int* data(const Protocol&)
+  {
+    return &value_;
+  }
+
+  // Get the address of the boolean data.
+  template <typename Protocol>
+  const int* data(const Protocol&) const
+  {
+    return &value_;
+  }
+
+  // Get the size of the boolean data.
+  template <typename Protocol>
+  std::size_t size(const Protocol&) const
+  {
+    return sizeof(value_);
+  }
+
+  // Set the size of the boolean data.
+  template <typename Protocol>
+  void resize(const Protocol&, std::size_t s)
+  {
+    // On some platforms (e.g. Windows Vista), the getsockopt function will
+    // return the size of a boolean socket option as one byte, even though a
+    // four byte integer was passed in.
+    switch (s)
+    {
+    case sizeof(char):
+      value_ = *reinterpret_cast<char*>(&value_) ? 1 : 0;
+      break;
+    case sizeof(value_):
+      break;
+    default:
+      {
+        std::length_error ex("boolean socket option resize");
+        boost::throw_exception(ex);
+      }
+    }
+  }
+
+private:
+  int value_;
+};
+
+// Helper template for implementing integer options.
+template <int Level, int Name>
+class integer
+{
+public:
+  // Default constructor.
+  integer()
+    : value_(0)
+  {
+  }
+
+  // Construct with a specific option value.
+  explicit integer(int v)
+    : value_(v)
+  {
+  }
+
+  // Set the value of the int option.
+  integer& operator=(int v)
+  {
+    value_ = v;
+    return *this;
+  }
+
+  // Get the current value of the int option.
+  int value() const
+  {
+    return value_;
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol&) const
+  {
+    return Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol&) const
+  {
+    return Name;
+  }
+
+  // Get the address of the int data.
+  template <typename Protocol>
+  int* data(const Protocol&)
+  {
+    return &value_;
+  }
+
+  // Get the address of the int data.
+  template <typename Protocol>
+  const int* data(const Protocol&) const
+  {
+    return &value_;
+  }
+
+  // Get the size of the int data.
+  template <typename Protocol>
+  std::size_t size(const Protocol&) const
+  {
+    return sizeof(value_);
+  }
+
+  // Set the size of the int data.
+  template <typename Protocol>
+  void resize(const Protocol&, std::size_t s)
+  {
+    if (s != sizeof(value_))
+    {
+      std::length_error ex("integer socket option resize");
+      boost::throw_exception(ex);
+    }
+  }
+
+private:
+  int value_;
+};
+
+// Helper template for implementing linger options.
+template <int Level, int Name>
+class linger
+{
+public:
+  // Default constructor.
+  linger()
+  {
+    value_.l_onoff = 0;
+    value_.l_linger = 0;
+  }
+
+  // Construct with specific option values.
+  linger(bool e, int t)
+  {
+    enabled(e);
+    timeout BOOST_PREVENT_MACRO_SUBSTITUTION(t);
+  }
+
+  // Set the value for whether linger is enabled.
+  void enabled(bool value)
+  {
+    value_.l_onoff = value ? 1 : 0;
+  }
+
+  // Get the value for whether linger is enabled.
+  bool enabled() const
+  {
+    return value_.l_onoff != 0;
+  }
+
+  // Set the value for the linger timeout.
+  void timeout BOOST_PREVENT_MACRO_SUBSTITUTION(int value)
+  {
+#if defined(WIN32)
+    value_.l_linger = static_cast<u_short>(value);
+#else
+    value_.l_linger = value;
+#endif
+  }
+
+  // Get the value for the linger timeout.
+  int timeout BOOST_PREVENT_MACRO_SUBSTITUTION() const
+  {
+    return static_cast<int>(value_.l_linger);
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol&) const
+  {
+    return Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol&) const
+  {
+    return Name;
+  }
+
+  // Get the address of the linger data.
+  template <typename Protocol>
+  ::linger* data(const Protocol&)
+  {
+    return &value_;
+  }
+
+  // Get the address of the linger data.
+  template <typename Protocol>
+  const ::linger* data(const Protocol&) const
+  {
+    return &value_;
+  }
+
+  // Get the size of the linger data.
+  template <typename Protocol>
+  std::size_t size(const Protocol&) const
+  {
+    return sizeof(value_);
+  }
+
+  // Set the size of the int data.
+  template <typename Protocol>
+  void resize(const Protocol&, std::size_t s)
+  {
+    if (s != sizeof(value_))
+    {
+      std::length_error ex("linger socket option resize");
+      boost::throw_exception(ex);
+    }
+  }
+
+private:
+  ::linger value_;
+};
+
+} // namespace socket_option
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SOCKET_OPTION_HPP
diff --git a/ext/asio/detail/socket_select_interrupter.hpp b/ext/asio/detail/socket_select_interrupter.hpp
new file mode 100644
index 0000000000..62e1063e30
--- /dev/null
+++ b/ext/asio/detail/socket_select_interrupter.hpp
@@ -0,0 +1,192 @@
+//
+// socket_select_interrupter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
+#define ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstdlib>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/socket_holder.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+class socket_select_interrupter
+{
+public:
+  // Constructor.
+  socket_select_interrupter()
+  {
+    asio::error_code ec;
+    socket_holder acceptor(socket_ops::socket(
+          AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
+    if (acceptor.get() == invalid_socket)
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    int opt = 1;
+    socket_ops::setsockopt(acceptor.get(),
+        SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt), ec);
+
+    using namespace std; // For memset.
+    sockaddr_in4_type addr;
+    std::size_t addr_len = sizeof(addr);
+    memset(&addr, 0, sizeof(addr));
+    addr.sin_family = AF_INET;
+    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+    addr.sin_port = 0;
+    if (socket_ops::bind(acceptor.get(), (const socket_addr_type*)&addr,
+          addr_len, ec) == socket_error_retval)
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    if (socket_ops::getsockname(acceptor.get(), (socket_addr_type*)&addr,
+          &addr_len, ec) == socket_error_retval)
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    // Some broken firewalls on Windows will intermittently cause getsockname to
+    // return 0.0.0.0 when the socket is actually bound to 127.0.0.1. We
+    // explicitly specify the target address here to work around this problem.
+    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+
+    if (socket_ops::listen(acceptor.get(),
+          SOMAXCONN, ec) == socket_error_retval)
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    socket_holder client(socket_ops::socket(
+          AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
+    if (client.get() == invalid_socket)
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    if (socket_ops::connect(client.get(), (const socket_addr_type*)&addr,
+          addr_len, ec) == socket_error_retval)
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    socket_holder server(socket_ops::accept(acceptor.get(), 0, 0, ec));
+    if (server.get() == invalid_socket)
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+    
+    ioctl_arg_type non_blocking = 1;
+    if (socket_ops::ioctl(client.get(), FIONBIO, &non_blocking, ec))
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    opt = 1;
+    socket_ops::setsockopt(client.get(),
+        IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
+
+    non_blocking = 1;
+    if (socket_ops::ioctl(server.get(), FIONBIO, &non_blocking, ec))
+    {
+      asio::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    opt = 1;
+    socket_ops::setsockopt(server.get(),
+        IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
+
+    read_descriptor_ = server.release();
+    write_descriptor_ = client.release();
+  }
+
+  // Destructor.
+  ~socket_select_interrupter()
+  {
+    asio::error_code ec;
+    if (read_descriptor_ != invalid_socket)
+      socket_ops::close(read_descriptor_, ec);
+    if (write_descriptor_ != invalid_socket)
+      socket_ops::close(write_descriptor_, ec);
+  }
+
+  // Interrupt the select call.
+  void interrupt()
+  {
+    char byte = 0;
+    socket_ops::buf b;
+    socket_ops::init_buf(b, &byte, 1);
+    asio::error_code ec;
+    socket_ops::send(write_descriptor_, &b, 1, 0, ec);
+  }
+
+  // Reset the select interrupt. Returns true if the call was interrupted.
+  bool reset()
+  {
+    char data[1024];
+    socket_ops::buf b;
+    socket_ops::init_buf(b, data, sizeof(data));
+    asio::error_code ec;
+    int bytes_read = socket_ops::recv(read_descriptor_, &b, 1, 0, ec);
+    bool was_interrupted = (bytes_read > 0);
+    while (bytes_read == sizeof(data))
+      bytes_read = socket_ops::recv(read_descriptor_, &b, 1, 0, ec);
+    return was_interrupted;
+  }
+
+  // Get the read descriptor to be passed to select.
+  socket_type read_descriptor() const
+  {
+    return read_descriptor_;
+  }
+
+private:
+  // The read end of a connection used to interrupt the select call. This file
+  // descriptor is passed to select such that when it is time to stop, a single
+  // byte will be written on the other end of the connection and this
+  // descriptor will become readable.
+  socket_type read_descriptor_;
+
+  // The write end of a connection used to interrupt the select call. A single
+  // byte may be written to this to wake up the select which is waiting for the
+  // other end to become readable.
+  socket_type write_descriptor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
diff --git a/ext/asio/detail/socket_types.hpp b/ext/asio/detail/socket_types.hpp
new file mode 100644
index 0000000000..34b3d3e631
--- /dev/null
+++ b/ext/asio/detail/socket_types.hpp
@@ -0,0 +1,216 @@
+//
+// socket_types.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SOCKET_TYPES_HPP
+#define ASIO_DETAIL_SOCKET_TYPES_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# if defined(_WINSOCKAPI_) && !defined(_WINSOCK2API_)
+#  error WinSock.h has already been included
+# endif // defined(_WINSOCKAPI_) && !defined(_WINSOCK2API_)
+# if !defined(_WIN32_WINNT) && !defined(_WIN32_WINDOWS)
+#  if defined(_MSC_VER) || defined(__BORLANDC__)
+#   pragma message( \
+  "Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. For example:\n"\
+  "- add -D_WIN32_WINNT=0x0501 to the compiler command line; or\n"\
+  "- add _WIN32_WINNT=0x0501 to your project's Preprocessor Definitions.\n"\
+  "Assuming _WIN32_WINNT=0x0501 (i.e. Windows XP target).")
+#  else // defined(_MSC_VER) || defined(__BORLANDC__)
+#   warning Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately.
+#   warning For example, add -D_WIN32_WINNT=0x0501 to the compiler command line.
+#   warning Assuming _WIN32_WINNT=0x0501 (i.e. Windows XP target).
+#  endif // defined(_MSC_VER) || defined(__BORLANDC__)
+#  define _WIN32_WINNT 0x0501
+# endif // !defined(_WIN32_WINNT) && !defined(_WIN32_WINDOWS)
+# if defined(_MSC_VER)
+#  if defined(_WIN32) && !defined(WIN32)
+#   if !defined(_WINSOCK2API_)
+#    define WIN32 // Needed for correct types in winsock2.h
+#   else // !defined(_WINSOCK2API_)
+#    error Please define the macro WIN32 in your compiler options
+#   endif // !defined(_WINSOCK2API_)
+#  endif // defined(_WIN32) && !defined(WIN32)
+# endif // defined(_MSC_VER)
+# if defined(__BORLANDC__)
+#  include <stdlib.h> // Needed for __errno
+#  if defined(__WIN32__) && !defined(WIN32)
+#   if !defined(_WINSOCK2API_)
+#    define WIN32 // Needed for correct types in winsock2.h
+#   else // !defined(_WINSOCK2API_)
+#    error Please define the macro WIN32 in your compiler options
+#   endif // !defined(_WINSOCK2API_)
+#  endif // defined(__WIN32__) && !defined(WIN32)
+#  if !defined(_WSPIAPI_H_)
+#   define _WSPIAPI_H_
+#   define ASIO_WSPIAPI_H_DEFINED
+#  endif // !defined(_WSPIAPI_H_)
+# endif // defined(__BORLANDC__)
+# if !defined(ASIO_NO_WIN32_LEAN_AND_MEAN)
+#  if !defined(WIN32_LEAN_AND_MEAN)
+#   define WIN32_LEAN_AND_MEAN
+#  endif // !defined(WIN32_LEAN_AND_MEAN)
+# endif // !defined(ASIO_NO_WIN32_LEAN_AND_MEAN)
+# if !defined(ASIO_NO_NOMINMAX)
+#  if !defined(NOMINMAX)
+#   define NOMINMAX 1
+#  endif // !defined(NOMINMAX)
+# endif // !defined(ASIO_NO_NOMINMAX)
+# if defined(__CYGWIN__)
+#  if !defined(__USE_W32_SOCKETS)
+#   error You must add -D__USE_W32_SOCKETS to your compiler options.
+#  endif // !defined(__USE_W32_SOCKETS)
+# endif // defined(__CYGWIN__)
+# include <winsock2.h>
+# include <ws2tcpip.h>
+# include <mswsock.h>
+# if defined(ASIO_WSPIAPI_H_DEFINED)
+#  undef _WSPIAPI_H_
+#  undef ASIO_WSPIAPI_H_DEFINED
+# endif // defined(ASIO_WSPIAPI_H_DEFINED)
+# if !defined(ASIO_NO_DEFAULT_LINKED_LIBS)
+#  if defined(UNDER_CE)
+#   pragma comment(lib, "ws2.lib")
+#  elif defined(_MSC_VER) || defined(__BORLANDC__)
+#   pragma comment(lib, "ws2_32.lib")
+#   pragma comment(lib, "mswsock.lib")
+#  endif // defined(_MSC_VER) || defined(__BORLANDC__)
+# endif // !defined(ASIO_NO_DEFAULT_LINKED_LIBS)
+# include "asio/detail/old_win_sdk_compat.hpp"
+#else
+# include <sys/ioctl.h>
+# include <sys/poll.h>
+# include <sys/types.h>
+# if defined(__hpux) && !defined(__HP_aCC)
+#  include <sys/time.h>
+# else
+#  include <sys/select.h>
+# endif
+# include <sys/socket.h>
+# include <sys/uio.h>
+# include <sys/un.h>
+# include <netinet/in.h>
+# include <netinet/tcp.h>
+# include <arpa/inet.h>
+# include <netdb.h>
+# include <net/if.h>
+# include <limits.h>
+# if defined(__sun)
+#  include <sys/filio.h>
+#  include <sys/sockio.h>
+# endif
+#endif
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+typedef SOCKET socket_type;
+const SOCKET invalid_socket = INVALID_SOCKET;
+const int socket_error_retval = SOCKET_ERROR;
+const int max_addr_v4_str_len = 256;
+const int max_addr_v6_str_len = 256;
+typedef sockaddr socket_addr_type;
+typedef in_addr in4_addr_type;
+typedef ip_mreq in4_mreq_type;
+typedef sockaddr_in sockaddr_in4_type;
+# if defined(ASIO_HAS_OLD_WIN_SDK)
+typedef in6_addr_emulation in6_addr_type;
+typedef ipv6_mreq_emulation in6_mreq_type;
+typedef sockaddr_in6_emulation sockaddr_in6_type;
+typedef sockaddr_storage_emulation sockaddr_storage_type;
+typedef addrinfo_emulation addrinfo_type;
+# else
+typedef in6_addr in6_addr_type;
+typedef ipv6_mreq in6_mreq_type;
+typedef sockaddr_in6 sockaddr_in6_type;
+typedef sockaddr_storage sockaddr_storage_type;
+typedef addrinfo addrinfo_type;
+# endif
+typedef unsigned long ioctl_arg_type;
+typedef u_long u_long_type;
+typedef u_short u_short_type;
+const int shutdown_receive = SD_RECEIVE;
+const int shutdown_send = SD_SEND;
+const int shutdown_both = SD_BOTH;
+const int message_peek = MSG_PEEK;
+const int message_out_of_band = MSG_OOB;
+const int message_do_not_route = MSG_DONTROUTE;
+# if defined (_WIN32_WINNT)
+const int max_iov_len = 64;
+# else
+const int max_iov_len = 16;
+# endif
+#else
+typedef int socket_type;
+const int invalid_socket = -1;
+const int socket_error_retval = -1;
+const int max_addr_v4_str_len = INET_ADDRSTRLEN;
+#if defined(INET6_ADDRSTRLEN)
+const int max_addr_v6_str_len = INET6_ADDRSTRLEN + 1 + IF_NAMESIZE;
+#else // defined(INET6_ADDRSTRLEN)
+const int max_addr_v6_str_len = 256;
+#endif // defined(INET6_ADDRSTRLEN)
+typedef sockaddr socket_addr_type;
+typedef in_addr in4_addr_type;
+# if defined(__hpux)
+// HP-UX doesn't provide ip_mreq when _XOPEN_SOURCE_EXTENDED is defined.
+struct in4_mreq_type
+{
+  struct in_addr imr_multiaddr;
+  struct in_addr imr_interface;
+};
+# else
+typedef ip_mreq in4_mreq_type;
+# endif
+typedef sockaddr_in sockaddr_in4_type;
+typedef in6_addr in6_addr_type;
+typedef ipv6_mreq in6_mreq_type;
+typedef sockaddr_in6 sockaddr_in6_type;
+typedef sockaddr_storage sockaddr_storage_type;
+typedef sockaddr_un sockaddr_un_type;
+typedef addrinfo addrinfo_type;
+typedef int ioctl_arg_type;
+typedef uint32_t u_long_type;
+typedef uint16_t u_short_type;
+const int shutdown_receive = SHUT_RD;
+const int shutdown_send = SHUT_WR;
+const int shutdown_both = SHUT_RDWR;
+const int message_peek = MSG_PEEK;
+const int message_out_of_band = MSG_OOB;
+const int message_do_not_route = MSG_DONTROUTE;
+# if defined(IOV_MAX)
+const int max_iov_len = IOV_MAX;
+# else
+// POSIX platforms are not required to define IOV_MAX.
+const int max_iov_len = 16;
+# endif
+#endif
+const int custom_socket_option_level = 0xA5100000;
+const int enable_connection_aborted_option = 1;
+const int always_fail_option = 2;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SOCKET_TYPES_HPP
diff --git a/ext/asio/detail/solaris_fenced_block.hpp b/ext/asio/detail/solaris_fenced_block.hpp
new file mode 100644
index 0000000000..d337f3b62e
--- /dev/null
+++ b/ext/asio/detail/solaris_fenced_block.hpp
@@ -0,0 +1,57 @@
+//
+// solaris_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SOLARIS_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_SOLARIS_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(__sun)
+
+#include "asio/detail/push_options.hpp"
+#include <atomic.h>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class solaris_fenced_block
+  : private noncopyable
+{
+public:
+  // Constructor.
+  solaris_fenced_block()
+  {
+    membar_consumer();
+  }
+
+  // Destructor.
+  ~solaris_fenced_block()
+  {
+    membar_producer();
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(__sun)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_SOLARIS_FENCED_BLOCK_HPP
diff --git a/ext/asio/detail/strand_service.hpp b/ext/asio/detail/strand_service.hpp
new file mode 100644
index 0000000000..ea50f412a1
--- /dev/null
+++ b/ext/asio/detail/strand_service.hpp
@@ -0,0 +1,276 @@
+//
+// strand_service.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_STRAND_SERVICE_HPP
+#define ASIO_DETAIL_STRAND_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/functional/hash.hpp>
+#include <boost/scoped_ptr.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/call_stack.hpp"
+#include "asio/detail/completion_handler.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/operation.hpp"
+#include "asio/detail/service_base.hpp"
+
+namespace asio {
+namespace detail {
+
+// Default service implementation for a strand.
+class strand_service
+  : public asio::detail::service_base<strand_service>
+{
+private:
+  struct on_do_complete_exit;
+  struct on_dispatch_exit;
+
+public:
+
+  // The underlying implementation of a strand.
+  class strand_impl
+    : public operation
+  {
+  public:
+    strand_impl()
+      : operation(&strand_service::do_complete),
+        count_(0)
+    {
+    }
+
+  private:
+    // Only this service will have access to the internal values.
+    friend class strand_service;
+    friend struct on_do_complete_exit;
+    friend struct on_dispatch_exit;
+
+    // Mutex to protect access to internal data.
+    asio::detail::mutex mutex_;
+
+    // The count of handlers in the strand, including the upcall (if any).
+    std::size_t count_;
+
+    // The handlers waiting on the strand.
+    op_queue<operation> queue_;
+  };
+
+  typedef strand_impl* implementation_type;
+
+  // Construct a new strand service for the specified io_service.
+  explicit strand_service(asio::io_service& io_service)
+    : asio::detail::service_base<strand_service>(io_service),
+      io_service_(asio::use_service<io_service_impl>(io_service)),
+      mutex_(),
+      salt_(0)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    op_queue<operation> ops;
+
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    for (std::size_t i = 0; i < num_implementations; ++i)
+      if (strand_impl* impl = implementations_[i].get())
+        ops.push(impl->queue_);
+  }
+
+  // Construct a new strand implementation.
+  void construct(implementation_type& impl)
+  {
+    std::size_t index = boost::hash_value(&impl);
+    boost::hash_combine(index, salt_++);
+    index = index % num_implementations;
+
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    if (!implementations_[index])
+      implementations_[index].reset(new strand_impl);
+    impl = implementations_[index].get();
+  }
+
+  // Destroy a strand implementation.
+  void destroy(implementation_type& impl)
+  {
+    impl = 0;
+  }
+
+  // Request the io_service to invoke the given handler.
+  template <typename Handler>
+  void dispatch(implementation_type& impl, Handler handler)
+  {
+    // If we are already in the strand then the handler can run immediately.
+    if (call_stack<strand_impl>::contains(impl))
+    {
+      asio::detail::fenced_block b;
+      asio_handler_invoke_helpers::invoke(handler, handler);
+      return;
+    }
+
+    // Allocate and construct an object to wrap the handler.
+    typedef completion_handler<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    // If we are running inside the io_service, and no other handler is queued
+    // or running, then the handler can run immediately.
+    bool can_dispatch = call_stack<io_service_impl>::contains(&io_service_);
+    impl->mutex_.lock();
+    bool first = (++impl->count_ == 1);
+    if (can_dispatch && first)
+    {
+      // Immediate invocation is allowed.
+      impl->mutex_.unlock();
+
+      // Memory must be releaesed before any upcall is made.
+      ptr.reset();
+
+      // Indicate that this strand is executing on the current thread.
+      call_stack<strand_impl>::context ctx(impl);
+
+      // Ensure the next handler, if any, is scheduled on block exit.
+      on_dispatch_exit on_exit = { &io_service_, impl };
+      (void)on_exit;
+
+      asio::detail::fenced_block b;
+      asio_handler_invoke_helpers::invoke(handler, handler);
+      return;
+    }
+
+    // Immediate invocation is not allowed, so enqueue for later.
+    impl->queue_.push(ptr.get());
+    impl->mutex_.unlock();
+    ptr.release();
+
+    // The first handler to be enqueued is responsible for scheduling the
+    // strand.
+    if (first)
+      io_service_.post_immediate_completion(impl);
+  }
+
+  // Request the io_service to invoke the given handler and return immediately.
+  template <typename Handler>
+  void post(implementation_type& impl, Handler handler)
+  {
+    // Allocate and construct an object to wrap the handler.
+    typedef completion_handler<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    // Add the handler to the queue.
+    impl->mutex_.lock();
+    bool first = (++impl->count_ == 1);
+    impl->queue_.push(ptr.get());
+    impl->mutex_.unlock();
+    ptr.release();
+
+    // The first handler to be enqueue is responsible for scheduling the strand.
+    if (first)
+      io_service_.post_immediate_completion(impl);
+  }
+
+private:
+  static void do_complete(io_service_impl* owner, operation* base,
+      asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+  {
+    if (owner)
+    {
+      strand_impl* impl = static_cast<strand_impl*>(base);
+
+      // Get the next handler to be executed.
+      impl->mutex_.lock();
+      operation* o = impl->queue_.front();
+      impl->queue_.pop();
+      impl->mutex_.unlock();
+
+      // Indicate that this strand is executing on the current thread.
+      call_stack<strand_impl>::context ctx(impl);
+
+      // Ensure the next handler, if any, is scheduled on block exit.
+      on_do_complete_exit on_exit = { owner, impl };
+      (void)on_exit;
+
+      o->complete(*owner);
+    }
+  }
+
+  // Helper class to re-post the strand on exit.
+  struct on_do_complete_exit
+  {
+    io_service_impl* owner_;
+    strand_impl* impl_;
+
+    ~on_do_complete_exit()
+    {
+      impl_->mutex_.lock();
+      bool more_handlers = (--impl_->count_ > 0);
+      impl_->mutex_.unlock();
+
+      if (more_handlers)
+        owner_->post_immediate_completion(impl_);
+    }
+  };
+
+  // Helper class to re-post the strand on exit.
+  struct on_dispatch_exit
+  {
+    io_service_impl* io_service_;
+    strand_impl* impl_;
+
+    ~on_dispatch_exit()
+    {
+      impl_->mutex_.lock();
+      bool more_handlers = (--impl_->count_ > 0);
+      impl_->mutex_.unlock();
+
+      if (more_handlers)
+        io_service_->post_immediate_completion(impl_);
+    }
+  };
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_;
+
+  // Mutex to protect access to the array of implementations.
+  asio::detail::mutex mutex_;
+
+  // Number of implementations shared between all strand objects.
+  enum { num_implementations = 193 };
+
+  // The head of a linked list of all implementations.
+  boost::scoped_ptr<strand_impl> implementations_[num_implementations];
+
+  // Extra value used when hashing to prevent recycled memory locations from
+  // getting the same strand implementation.
+  std::size_t salt_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_STRAND_SERVICE_HPP
diff --git a/ext/asio/detail/task_io_service.hpp b/ext/asio/detail/task_io_service.hpp
new file mode 100644
index 0000000000..eb77c1d8de
--- /dev/null
+++ b/ext/asio/detail/task_io_service.hpp
@@ -0,0 +1,465 @@
+//
+// task_io_service.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TASK_IO_SERVICE_HPP
+#define ASIO_DETAIL_TASK_IO_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/error_code.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/call_stack.hpp"
+#include "asio/detail/completion_handler.hpp"
+#include "asio/detail/event.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/task_io_service_fwd.hpp"
+#include "asio/detail/task_io_service_operation.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/detail/atomic_count.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Task>
+class task_io_service
+  : public asio::detail::service_base<task_io_service<Task> >
+{
+public:
+  typedef task_io_service_operation<Task> operation;
+
+  // Constructor.
+  task_io_service(asio::io_service& io_service)
+    : asio::detail::service_base<task_io_service<Task> >(io_service),
+      mutex_(),
+      task_(0),
+      task_interrupted_(true),
+      outstanding_work_(0),
+      stopped_(false),
+      shutdown_(false),
+      first_idle_thread_(0)
+  {
+  }
+
+  void init(size_t /*concurrency_hint*/)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    shutdown_ = true;
+    lock.unlock();
+
+    // Destroy handler objects.
+    while (!op_queue_.empty())
+    {
+      operation* o = op_queue_.front();
+      op_queue_.pop();
+      if (o != &task_operation_)
+        o->destroy();
+    }
+
+    // Reset to initial state.
+    task_ = 0;
+  }
+
+  // Initialise the task, if required.
+  void init_task()
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    if (!shutdown_ && !task_)
+    {
+      task_ = &use_service<Task>(this->get_io_service());
+      op_queue_.push(&task_operation_);
+      wake_one_thread_and_unlock(lock);
+    }
+  }
+
+  // Run the event loop until interrupted or no more work.
+  size_t run(asio::error_code& ec)
+  {
+    ec = asio::error_code();
+    if (outstanding_work_ == 0)
+    {
+      stop();
+      return 0;
+    }
+
+    typename call_stack<task_io_service>::context ctx(this);
+
+    idle_thread_info this_idle_thread;
+    this_idle_thread.next = 0;
+
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    size_t n = 0;
+    for (; do_one(lock, &this_idle_thread); lock.lock())
+      if (n != (std::numeric_limits<size_t>::max)())
+        ++n;
+    return n;
+  }
+
+  // Run until interrupted or one operation is performed.
+  size_t run_one(asio::error_code& ec)
+  {
+    ec = asio::error_code();
+    if (outstanding_work_ == 0)
+    {
+      stop();
+      return 0;
+    }
+
+    typename call_stack<task_io_service>::context ctx(this);
+
+    idle_thread_info this_idle_thread;
+    this_idle_thread.next = 0;
+
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    return do_one(lock, &this_idle_thread);
+  }
+
+  // Poll for operations without blocking.
+  size_t poll(asio::error_code& ec)
+  {
+    if (outstanding_work_ == 0)
+    {
+      stop();
+      ec = asio::error_code();
+      return 0;
+    }
+
+    typename call_stack<task_io_service>::context ctx(this);
+
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    size_t n = 0;
+    for (; do_one(lock, 0); lock.lock())
+      if (n != (std::numeric_limits<size_t>::max)())
+        ++n;
+    return n;
+  }
+
+  // Poll for one operation without blocking.
+  size_t poll_one(asio::error_code& ec)
+  {
+    ec = asio::error_code();
+    if (outstanding_work_ == 0)
+    {
+      stop();
+      return 0;
+    }
+
+    typename call_stack<task_io_service>::context ctx(this);
+
+    asio::detail::mutex::scoped_lock lock(mutex_);
+
+    return do_one(lock, 0);
+  }
+
+  // Interrupt the event processing loop.
+  void stop()
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    stop_all_threads(lock);
+  }
+
+  // Reset in preparation for a subsequent run invocation.
+  void reset()
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    stopped_ = false;
+  }
+
+  // Notify that some work has started.
+  void work_started()
+  {
+    ++outstanding_work_;
+  }
+
+  // Notify that some work has finished.
+  void work_finished()
+  {
+    if (--outstanding_work_ == 0)
+      stop();
+  }
+
+  // Request invocation of the given handler.
+  template <typename Handler>
+  void dispatch(Handler handler)
+  {
+    if (call_stack<task_io_service>::contains(this))
+    {
+      asio::detail::fenced_block b;
+      asio_handler_invoke_helpers::invoke(handler, handler);
+    }
+    else
+      post(handler);
+  }
+
+  // Request invocation of the given handler and return immediately.
+  template <typename Handler>
+  void post(Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef completion_handler<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    post_immediate_completion(ptr.get());
+    ptr.release();
+  }
+
+  // Request invocation of the given operation and return immediately. Assumes
+  // that work_started() has not yet been called for the operation.
+  void post_immediate_completion(operation* op)
+  {
+    work_started();
+    post_deferred_completion(op);
+  }
+
+  // Request invocation of the given operation and return immediately. Assumes
+  // that work_started() was previously called for the operation.
+  void post_deferred_completion(operation* op)
+  {
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    op_queue_.push(op);
+    wake_one_thread_and_unlock(lock);
+  }
+
+  // Request invocation of the given operations and return immediately. Assumes
+  // that work_started() was previously called for each operation.
+  void post_deferred_completions(op_queue<operation>& ops)
+  {
+    if (!ops.empty())
+    {
+      asio::detail::mutex::scoped_lock lock(mutex_);
+      op_queue_.push(ops);
+      wake_one_thread_and_unlock(lock);
+    }
+  }
+
+private:
+  struct idle_thread_info;
+
+  size_t do_one(asio::detail::mutex::scoped_lock& lock,
+      idle_thread_info* this_idle_thread)
+  {
+    bool polling = !this_idle_thread;
+    bool task_has_run = false;
+    while (!stopped_)
+    {
+      if (!op_queue_.empty())
+      {
+        // Prepare to execute first handler from queue.
+        operation* o = op_queue_.front();
+        op_queue_.pop();
+        bool more_handlers = (!op_queue_.empty());
+
+        if (o == &task_operation_)
+        {
+          task_interrupted_ = more_handlers || polling;
+
+          // If the task has already run and we're polling then we're done.
+          if (task_has_run && polling)
+          {
+            task_interrupted_ = true;
+            op_queue_.push(&task_operation_);
+            return 0;
+          }
+          task_has_run = true;
+
+          if (!more_handlers || !wake_one_idle_thread_and_unlock(lock))
+            lock.unlock();
+
+          op_queue<operation> completed_ops;
+          task_cleanup c = { this, &lock, &completed_ops };
+          (void)c;
+
+          // Run the task. May throw an exception. Only block if the operation
+          // queue is empty and we're not polling, otherwise we want to return
+          // as soon as possible.
+          task_->run(!more_handlers && !polling, completed_ops);
+        }
+        else
+        {
+          if (more_handlers)
+            wake_one_thread_and_unlock(lock);
+          else
+            lock.unlock();
+
+          // Ensure the count of outstanding work is decremented on block exit.
+          work_finished_on_block_exit on_exit = { this };
+          (void)on_exit;
+
+          // Complete the operation. May throw an exception.
+          o->complete(*this); // deletes the operation object
+
+          return 1;
+        }
+      }
+      else if (this_idle_thread)
+      {
+        // Nothing to run right now, so just wait for work to do.
+        this_idle_thread->next = first_idle_thread_;
+        first_idle_thread_ = this_idle_thread;
+        this_idle_thread->wakeup_event.clear(lock);
+        this_idle_thread->wakeup_event.wait(lock);
+      }
+      else
+      {
+        return 0;
+      }
+    }
+
+    return 0;
+  }
+
+  // Stop the task and all idle threads.
+  void stop_all_threads(
+      asio::detail::mutex::scoped_lock& lock)
+  {
+    stopped_ = true;
+
+    while (first_idle_thread_)
+    {
+      idle_thread_info* idle_thread = first_idle_thread_;
+      first_idle_thread_ = idle_thread->next;
+      idle_thread->next = 0;
+      idle_thread->wakeup_event.signal(lock);
+    }
+
+    if (!task_interrupted_ && task_)
+    {
+      task_interrupted_ = true;
+      task_->interrupt();
+    }
+  }
+
+  // Wakes a single idle thread and unlocks the mutex. Returns true if an idle
+  // thread was found. If there is no idle thread, returns false and leaves the
+  // mutex locked.
+  bool wake_one_idle_thread_and_unlock(
+      asio::detail::mutex::scoped_lock& lock)
+  {
+    if (first_idle_thread_)
+    {
+      idle_thread_info* idle_thread = first_idle_thread_;
+      first_idle_thread_ = idle_thread->next;
+      idle_thread->next = 0;
+      idle_thread->wakeup_event.signal_and_unlock(lock);
+      return true;
+    }
+    return false;
+  }
+
+  // Wake a single idle thread, or the task, and always unlock the mutex.
+  void wake_one_thread_and_unlock(
+      asio::detail::mutex::scoped_lock& lock)
+  {
+    if (!wake_one_idle_thread_and_unlock(lock))
+    {
+      if (!task_interrupted_ && task_)
+      {
+        task_interrupted_ = true;
+        task_->interrupt();
+      }
+      lock.unlock();
+    }
+  }
+
+  // Helper class to perform task-related operations on block exit.
+  struct task_cleanup;
+  friend struct task_cleanup;
+  struct task_cleanup
+  {
+    ~task_cleanup()
+    {
+      // Enqueue the completed operations and reinsert the task at the end of
+      // the operation queue.
+      lock_->lock();
+      task_io_service_->task_interrupted_ = true;
+      task_io_service_->op_queue_.push(*ops_);
+      task_io_service_->op_queue_.push(&task_io_service_->task_operation_);
+    }
+
+    task_io_service* task_io_service_;
+    asio::detail::mutex::scoped_lock* lock_;
+    op_queue<operation>* ops_;
+  };
+
+  // Helper class to call work_finished() on block exit.
+  struct work_finished_on_block_exit
+  {
+    ~work_finished_on_block_exit()
+    {
+      task_io_service_->work_finished();
+    }
+
+    task_io_service* task_io_service_;
+  };
+
+  // Mutex to protect access to internal data.
+  asio::detail::mutex mutex_;
+
+  // The task to be run by this service.
+  Task* task_;
+
+  // Operation object to represent the position of the task in the queue.
+  struct task_operation : public operation
+  {
+    task_operation() : operation(0) {}
+  } task_operation_;
+
+  // Whether the task has been interrupted.
+  bool task_interrupted_;
+
+  // The count of unfinished work.
+  boost::detail::atomic_count outstanding_work_;
+
+  // The queue of handlers that are ready to be delivered.
+  op_queue<operation> op_queue_;
+
+  // Flag to indicate that the dispatcher has been stopped.
+  bool stopped_;
+
+  // Flag to indicate that the dispatcher has been shut down.
+  bool shutdown_;
+
+  // Structure containing information about an idle thread.
+  struct idle_thread_info
+  {
+    event wakeup_event;
+    idle_thread_info* next;
+  };
+
+  // The threads that are currently idle.
+  idle_thread_info* first_idle_thread_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TASK_IO_SERVICE_HPP
diff --git a/ext/asio/detail/task_io_service_fwd.hpp b/ext/asio/detail/task_io_service_fwd.hpp
new file mode 100644
index 0000000000..5b18d1d700
--- /dev/null
+++ b/ext/asio/detail/task_io_service_fwd.hpp
@@ -0,0 +1,31 @@
+//
+// task_io_service_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TASK_IO_SERVICE_FWD_HPP
+#define ASIO_DETAIL_TASK_IO_SERVICE_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Task>
+class task_io_service;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TASK_IO_SERVICE_FWD_HPP
diff --git a/ext/asio/detail/task_io_service_operation.hpp b/ext/asio/detail/task_io_service_operation.hpp
new file mode 100644
index 0000000000..6776f6992f
--- /dev/null
+++ b/ext/asio/detail/task_io_service_operation.hpp
@@ -0,0 +1,69 @@
+//
+// task_io_service_operation.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TASK_IO_SERVICE_OPERATION_HPP
+#define ASIO_DETAIL_TASK_IO_SERVICE_OPERATION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/error_code.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/task_io_service_fwd.hpp"
+
+namespace asio {
+namespace detail {
+
+// Base class for all operations. A function pointer is used instead of virtual
+// functions to avoid the associated overhead.
+template <typename Task>
+class task_io_service_operation
+{
+public:
+  void complete(task_io_service<Task>& owner)
+  {
+    func_(&owner, this, asio::error_code(), 0);
+  }
+
+  void destroy()
+  {
+    func_(0, this, asio::error_code(), 0);
+  }
+
+protected:
+  typedef void (*func_type)(task_io_service<Task>*,
+      task_io_service_operation*, asio::error_code, std::size_t);
+
+  task_io_service_operation(func_type func)
+    : next_(0),
+      func_(func)
+  {
+  }
+
+  // Prevents deletion through this type.
+  ~task_io_service_operation()
+  {
+  }
+
+private:
+  friend class op_queue_access;
+  task_io_service_operation* next_;
+  func_type func_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TASK_IO_SERVICE_OPERATION_HPP
diff --git a/ext/asio/detail/thread.hpp b/ext/asio/detail/thread.hpp
new file mode 100644
index 0000000000..3c9280bcd3
--- /dev/null
+++ b/ext/asio/detail/thread.hpp
@@ -0,0 +1,58 @@
+//
+// thread.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_THREAD_HPP
+#define ASIO_DETAIL_THREAD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+# include "asio/detail/null_thread.hpp"
+#elif defined(BOOST_WINDOWS)
+# if defined(UNDER_CE)
+#  include "asio/detail/wince_thread.hpp"
+# else
+#  include "asio/detail/win_thread.hpp"
+# endif
+#elif defined(BOOST_HAS_PTHREADS)
+# include "asio/detail/posix_thread.hpp"
+#else
+# error Only Windows and POSIX are supported!
+#endif
+
+namespace asio {
+namespace detail {
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+typedef null_thread thread;
+#elif defined(BOOST_WINDOWS)
+# if defined(UNDER_CE)
+typedef wince_thread thread;
+# else
+typedef win_thread thread;
+# endif
+#elif defined(BOOST_HAS_PTHREADS)
+typedef posix_thread thread;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_THREAD_HPP
diff --git a/ext/asio/detail/throw_error.hpp b/ext/asio/detail/throw_error.hpp
new file mode 100644
index 0000000000..51d6e48f4f
--- /dev/null
+++ b/ext/asio/detail/throw_error.hpp
@@ -0,0 +1,44 @@
+//
+// throw_error.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_THROW_ERROR_HPP
+#define ASIO_DETAIL_THROW_ERROR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error_code.hpp"
+#include "asio/system_error.hpp"
+
+namespace asio {
+namespace detail {
+
+inline void throw_error(const asio::error_code& err)
+{
+  if (err)
+  {
+    asio::system_error e(err);
+    boost::throw_exception(e);
+  }
+}
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_THROW_ERROR_HPP
diff --git a/ext/asio/detail/timer_op.hpp b/ext/asio/detail/timer_op.hpp
new file mode 100644
index 0000000000..bf3c3ae593
--- /dev/null
+++ b/ext/asio/detail/timer_op.hpp
@@ -0,0 +1,44 @@
+//
+// timer_op.hpp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_OP_HPP
+#define ASIO_DETAIL_TIMER_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/operation.hpp"
+
+namespace asio {
+namespace detail {
+
+class timer_op
+  : public operation
+{
+public:
+  // The error code to be passed to the completion handler.
+  asio::error_code ec_;
+
+protected:
+  timer_op(func_type func)
+    : operation(func)
+  {
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_OP_HPP
diff --git a/ext/asio/detail/timer_queue.hpp b/ext/asio/detail/timer_queue.hpp
new file mode 100644
index 0000000000..2e4d2d5d97
--- /dev/null
+++ b/ext/asio/detail/timer_queue.hpp
@@ -0,0 +1,276 @@
+//
+// timer_queue.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_QUEUE_HPP
+#define ASIO_DETAIL_TIMER_QUEUE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <memory>
+#include <vector>
+#include <boost/config.hpp>
+#include <boost/limits.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/hash_map.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/timer_op.hpp"
+#include "asio/detail/timer_queue_base.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Time_Traits>
+class timer_queue
+  : public timer_queue_base
+{
+public:
+  // The time type.
+  typedef typename Time_Traits::time_type time_type;
+
+  // The duration type.
+  typedef typename Time_Traits::duration_type duration_type;
+
+  // Constructor.
+  timer_queue()
+    : timers_(),
+      heap_()
+  {
+  }
+
+  // Add a new timer to the queue. Returns true if this is the timer that is
+  // earliest in the queue, in which case the reactor's event demultiplexing
+  // function call may need to be interrupted and restarted.
+  bool enqueue_timer(const time_type& time, timer_op* op, void* token)
+  {
+    // Ensure that there is space for the timer in the heap. We reserve here so
+    // that the push_back below will not throw due to a reallocation failure.
+    heap_.reserve(heap_.size() + 1);
+
+    // Insert the new timer into the hash.
+    typedef typename hash_map<void*, timer>::iterator iterator;
+    typedef typename hash_map<void*, timer>::value_type value_type;
+    std::pair<iterator, bool> result =
+      timers_.insert(value_type(token, timer()));
+    result.first->second.op_queue_.push(op);
+    if (result.second)
+    {
+      // Put the new timer at the correct position in the heap.
+      result.first->second.time_ = time;
+      result.first->second.heap_index_ = heap_.size();
+      result.first->second.token_ = token;
+      heap_.push_back(&result.first->second);
+      up_heap(heap_.size() - 1);
+    }
+
+    return (heap_[0] == &result.first->second);
+  }
+
+  // Whether there are no timers in the queue.
+  virtual bool empty() const
+  {
+    return heap_.empty();
+  }
+
+  // Get the time for the timer that is earliest in the queue.
+  virtual long wait_duration_msec(long max_duration) const
+  {
+    if (heap_.empty())
+      return max_duration;
+
+    boost::posix_time::time_duration duration = Time_Traits::to_posix_duration(
+        Time_Traits::subtract(heap_[0]->time_, Time_Traits::now()));
+
+    if (duration > boost::posix_time::milliseconds(max_duration))
+      duration = boost::posix_time::milliseconds(max_duration);
+    else if (duration < boost::posix_time::milliseconds(0))
+      duration = boost::posix_time::milliseconds(0);
+
+    return duration.total_milliseconds();
+  }
+
+  // Get the time for the timer that is earliest in the queue.
+  virtual long wait_duration_usec(long max_duration) const
+  {
+    if (heap_.empty())
+      return max_duration;
+
+    boost::posix_time::time_duration duration = Time_Traits::to_posix_duration(
+        Time_Traits::subtract(heap_[0]->time_, Time_Traits::now()));
+
+    if (duration > boost::posix_time::microseconds(max_duration))
+      duration = boost::posix_time::microseconds(max_duration);
+    else if (duration < boost::posix_time::microseconds(0))
+      duration = boost::posix_time::microseconds(0);
+
+    return duration.total_microseconds();
+  }
+
+  // Dequeue all timers not later than the current time.
+  virtual void get_ready_timers(op_queue<operation>& ops)
+  {
+    const time_type now = Time_Traits::now();
+    while (!heap_.empty() && !Time_Traits::less_than(now, heap_[0]->time_))
+    {
+      timer* t = heap_[0];
+      ops.push(t->op_queue_);
+      remove_timer(t);
+    }
+  }
+
+  // Dequeue all timers.
+  virtual void get_all_timers(op_queue<operation>& ops)
+  {
+    typename hash_map<void*, timer>::iterator i = timers_.begin();
+    typename hash_map<void*, timer>::iterator end = timers_.end();
+    while (i != end)
+    {
+      ops.push(i->second.op_queue_);
+      typename hash_map<void*, timer>::iterator old_i = i++;
+      timers_.erase(old_i);
+    }
+
+    heap_.clear();
+    timers_.clear();
+  }
+
+  // Cancel and dequeue the timers with the given token.
+  std::size_t cancel_timer(void* timer_token, op_queue<operation>& ops)
+  {
+    std::size_t num_cancelled = 0;
+    typedef typename hash_map<void*, timer>::iterator iterator;
+    iterator it = timers_.find(timer_token);
+    if (it != timers_.end())
+    {
+      while (timer_op* op = it->second.op_queue_.front())
+      {
+        op->ec_ = asio::error::operation_aborted;
+        it->second.op_queue_.pop();
+        ops.push(op);
+        ++num_cancelled;
+      }
+      remove_timer(&it->second);
+    }
+    return num_cancelled;
+  }
+
+private:
+  // Structure representing a single outstanding timer.
+  struct timer
+  {
+    timer() {}
+    timer(const timer&) {}
+    void operator=(const timer&) {}
+
+    // The time when the timer should fire.
+    time_type time_;
+
+    // The operations waiting on the timer.
+    op_queue<timer_op> op_queue_;
+
+    // The index of the timer in the heap.
+    size_t heap_index_;
+
+    // The token associated with the timer.
+    void* token_;
+  };
+
+  // Move the item at the given index up the heap to its correct position.
+  void up_heap(size_t index)
+  {
+    size_t parent = (index - 1) / 2;
+    while (index > 0
+        && Time_Traits::less_than(heap_[index]->time_, heap_[parent]->time_))
+    {
+      swap_heap(index, parent);
+      index = parent;
+      parent = (index - 1) / 2;
+    }
+  }
+
+  // Move the item at the given index down the heap to its correct position.
+  void down_heap(size_t index)
+  {
+    size_t child = index * 2 + 1;
+    while (child < heap_.size())
+    {
+      size_t min_child = (child + 1 == heap_.size()
+          || Time_Traits::less_than(
+            heap_[child]->time_, heap_[child + 1]->time_))
+        ? child : child + 1;
+      if (Time_Traits::less_than(heap_[index]->time_, heap_[min_child]->time_))
+        break;
+      swap_heap(index, min_child);
+      index = min_child;
+      child = index * 2 + 1;
+    }
+  }
+
+  // Swap two entries in the heap.
+  void swap_heap(size_t index1, size_t index2)
+  {
+    timer* tmp = heap_[index1];
+    heap_[index1] = heap_[index2];
+    heap_[index2] = tmp;
+    heap_[index1]->heap_index_ = index1;
+    heap_[index2]->heap_index_ = index2;
+  }
+
+  // Remove a timer from the heap and list of timers.
+  void remove_timer(timer* t)
+  {
+    // Remove the timer from the heap.
+    size_t index = t->heap_index_;
+    if (!heap_.empty() && index < heap_.size())
+    {
+      if (index == heap_.size() - 1)
+      {
+        heap_.pop_back();
+      }
+      else
+      {
+        swap_heap(index, heap_.size() - 1);
+        heap_.pop_back();
+        size_t parent = (index - 1) / 2;
+        if (index > 0 && Time_Traits::less_than(
+              heap_[index]->time_, heap_[parent]->time_))
+          up_heap(index);
+        else
+          down_heap(index);
+      }
+    }
+
+    // Remove the timer from the hash.
+    typedef typename hash_map<void*, timer>::iterator iterator;
+    iterator it = timers_.find(t->token_);
+    if (it != timers_.end())
+      timers_.erase(it);
+  }
+
+  // A hash of timer token to linked lists of timers.
+  hash_map<void*, timer> timers_;
+
+  // The heap of timers, with the earliest timer at the front.
+  std::vector<timer*> heap_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_QUEUE_HPP
diff --git a/ext/asio/detail/timer_queue_base.hpp b/ext/asio/detail/timer_queue_base.hpp
new file mode 100644
index 0000000000..f978667535
--- /dev/null
+++ b/ext/asio/detail/timer_queue_base.hpp
@@ -0,0 +1,64 @@
+//
+// timer_queue_base.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_QUEUE_BASE_HPP
+#define ASIO_DETAIL_TIMER_QUEUE_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/operation.hpp"
+
+namespace asio {
+namespace detail {
+
+class timer_queue_base
+  : private noncopyable
+{
+public:
+  // Constructor.
+  timer_queue_base() : next_(0) {}
+
+  // Destructor.
+  virtual ~timer_queue_base() {}
+
+  // Whether there are no timers in the queue.
+  virtual bool empty() const = 0;
+
+  // Get the time to wait until the next timer.
+  virtual long wait_duration_msec(long max_duration) const = 0;
+
+  // Get the time to wait until the next timer.
+  virtual long wait_duration_usec(long max_duration) const = 0;
+
+  // Dequeue all ready timers.
+  virtual void get_ready_timers(op_queue<operation>& ops) = 0;
+
+  // Dequeue all timers.
+  virtual void get_all_timers(op_queue<operation>& ops) = 0;
+
+private:
+  friend class timer_queue_set;
+
+  // Next timer queue in the set.
+  timer_queue_base* next_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_QUEUE_BASE_HPP
diff --git a/ext/asio/detail/timer_queue_fwd.hpp b/ext/asio/detail/timer_queue_fwd.hpp
new file mode 100644
index 0000000000..53172448bc
--- /dev/null
+++ b/ext/asio/detail/timer_queue_fwd.hpp
@@ -0,0 +1,31 @@
+//
+// timer_queue_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_QUEUE_FWD_HPP
+#define ASIO_DETAIL_TIMER_QUEUE_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Time_Traits>
+class timer_queue;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_QUEUE_FWD_HPP
diff --git a/ext/asio/detail/timer_queue_set.hpp b/ext/asio/detail/timer_queue_set.hpp
new file mode 100644
index 0000000000..6860867074
--- /dev/null
+++ b/ext/asio/detail/timer_queue_set.hpp
@@ -0,0 +1,115 @@
+//
+// timer_queue_set.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_QUEUE_SET_HPP
+#define ASIO_DETAIL_TIMER_QUEUE_SET_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/timer_queue_base.hpp"
+
+namespace asio {
+namespace detail {
+
+class timer_queue_set
+{
+public:
+  // Constructor.
+  timer_queue_set()
+    : first_(0)
+  {
+  }
+
+  // Add a timer queue to the set.
+  void insert(timer_queue_base* q)
+  {
+    q->next_ = first_;
+    first_ = q;
+  }
+
+  // Remove a timer queue from the set.
+  void erase(timer_queue_base* q)
+  {
+    if (first_)
+    {
+      if (q == first_)
+      {
+        first_ = q->next_;
+        q->next_ = 0;
+        return;
+      }
+
+      for (timer_queue_base* p = first_; p->next_; p = p->next_)
+      {
+        if (p->next_ == q)
+        {
+          p->next_ = q->next_;
+          q->next_ = 0;
+          return;
+        }
+      }
+    }
+  }
+
+  // Determine whether all queues are empty.
+  bool all_empty() const
+  {
+    for (timer_queue_base* p = first_; p; p = p->next_)
+      if (!p->empty())
+        return false;
+    return true;
+  }
+
+  // Get the wait duration in milliseconds.
+  long wait_duration_msec(long max_duration) const
+  {
+    long min_duration = max_duration;
+    for (timer_queue_base* p = first_; p; p = p->next_)
+      min_duration = p->wait_duration_msec(min_duration);
+    return min_duration;
+  }
+
+  // Get the wait duration in microseconds.
+  long wait_duration_usec(long max_duration) const
+  {
+    long min_duration = max_duration;
+    for (timer_queue_base* p = first_; p; p = p->next_)
+      min_duration = p->wait_duration_usec(min_duration);
+    return min_duration;
+  }
+
+  // Dequeue all ready timers.
+  void get_ready_timers(op_queue<operation>& ops)
+  {
+    for (timer_queue_base* p = first_; p; p = p->next_)
+      p->get_ready_timers(ops);
+  }
+
+  // Dequeue all timers.
+  void get_all_timers(op_queue<operation>& ops)
+  {
+    for (timer_queue_base* p = first_; p; p = p->next_)
+      p->get_all_timers(ops);
+  }
+
+private:
+  timer_queue_base* first_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_QUEUE_SET_HPP
diff --git a/ext/asio/detail/timer_scheduler.hpp b/ext/asio/detail/timer_scheduler.hpp
new file mode 100644
index 0000000000..6822d3f793
--- /dev/null
+++ b/ext/asio/detail/timer_scheduler.hpp
@@ -0,0 +1,36 @@
+//
+// timer_scheduler.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_SCHEDULER_HPP
+#define ASIO_DETAIL_TIMER_SCHEDULER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/timer_scheduler_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_io_service.hpp"
+#elif defined(ASIO_HAS_EPOLL)
+# include "asio/detail/epoll_reactor.hpp"
+#elif defined(ASIO_HAS_KQUEUE)
+# include "asio/detail/kqueue_reactor.hpp"
+#elif defined(ASIO_HAS_DEV_POLL)
+# include "asio/detail/dev_poll_reactor.hpp"
+#else
+# include "asio/detail/select_reactor.hpp"
+#endif
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_SCHEDULER_HPP
diff --git a/ext/asio/detail/timer_scheduler_fwd.hpp b/ext/asio/detail/timer_scheduler_fwd.hpp
new file mode 100644
index 0000000000..d766a87fb2
--- /dev/null
+++ b/ext/asio/detail/timer_scheduler_fwd.hpp
@@ -0,0 +1,46 @@
+//
+// timer_scheduler_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_SCHEDULER_FWD_HPP
+#define ASIO_DETAIL_TIMER_SCHEDULER_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/dev_poll_reactor_fwd.hpp"
+#include "asio/detail/epoll_reactor_fwd.hpp"
+#include "asio/detail/kqueue_reactor_fwd.hpp"
+#include "asio/detail/select_reactor_fwd.hpp"
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+namespace asio {
+namespace detail {
+
+#if defined(ASIO_HAS_IOCP)
+typedef win_iocp_io_service timer_scheduler;
+#elif defined(ASIO_HAS_EPOLL)
+typedef epoll_reactor timer_scheduler;
+#elif defined(ASIO_HAS_KQUEUE)
+typedef kqueue_reactor timer_scheduler;
+#elif defined(ASIO_HAS_DEV_POLL)
+typedef dev_poll_reactor timer_scheduler;
+#else
+typedef select_reactor<false> timer_scheduler;
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_SCHEDULER_FWD_HPP
diff --git a/ext/asio/detail/tss_ptr.hpp b/ext/asio/detail/tss_ptr.hpp
new file mode 100644
index 0000000000..ac67d9f0ce
--- /dev/null
+++ b/ext/asio/detail/tss_ptr.hpp
@@ -0,0 +1,65 @@
+//
+// tss_ptr.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TSS_PTR_HPP
+#define ASIO_DETAIL_TSS_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+# include "asio/detail/null_tss_ptr.hpp"
+#elif defined(BOOST_WINDOWS)
+# include "asio/detail/win_tss_ptr.hpp"
+#elif defined(BOOST_HAS_PTHREADS)
+# include "asio/detail/posix_tss_ptr.hpp"
+#else
+# error Only Windows and POSIX are supported!
+#endif
+
+namespace asio {
+namespace detail {
+
+template <typename T>
+class tss_ptr
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+  : public null_tss_ptr<T>
+#elif defined(BOOST_WINDOWS)
+  : public win_tss_ptr<T>
+#elif defined(BOOST_HAS_PTHREADS)
+  : public posix_tss_ptr<T>
+#endif
+{
+public:
+  void operator=(T* value)
+  {
+#if !defined(BOOST_HAS_THREADS) || defined(ASIO_DISABLE_THREADS)
+    null_tss_ptr<T>::operator=(value);
+#elif defined(BOOST_WINDOWS)
+    win_tss_ptr<T>::operator=(value);
+#elif defined(BOOST_HAS_PTHREADS)
+    posix_tss_ptr<T>::operator=(value);
+#endif
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TSS_PTR_HPP
diff --git a/ext/asio/detail/win_event.hpp b/ext/asio/detail/win_event.hpp
new file mode 100644
index 0000000000..cabb2c389c
--- /dev/null
+++ b/ext/asio/detail/win_event.hpp
@@ -0,0 +1,112 @@
+//
+// win_event.hpp
+// ~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_EVENT_HPP
+#define ASIO_DETAIL_WIN_EVENT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS)
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/assert.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class win_event
+  : private noncopyable
+{
+public:
+  // Constructor.
+  win_event()
+    : event_(::CreateEvent(0, true, false, 0))
+  {
+    if (!event_)
+    {
+      DWORD last_error = ::GetLastError();
+      asio::system_error e(
+          asio::error_code(last_error,
+            asio::error::get_system_category()),
+          "event");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~win_event()
+  {
+    ::CloseHandle(event_);
+  }
+
+  // Signal the event.
+  template <typename Lock>
+  void signal(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    (void)lock;
+    ::SetEvent(event_);
+  }
+
+  // Signal the event and unlock the mutex.
+  template <typename Lock>
+  void signal_and_unlock(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    lock.unlock();
+    ::SetEvent(event_);
+  }
+
+  // Reset the event.
+  template <typename Lock>
+  void clear(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    (void)lock;
+    ::ResetEvent(event_);
+  }
+
+  // Wait for the event to become signalled.
+  template <typename Lock>
+  void wait(Lock& lock)
+  {
+    BOOST_ASSERT(lock.locked());
+    lock.unlock();
+    ::WaitForSingleObject(event_, INFINITE);
+    lock.lock();
+  }
+
+private:
+  HANDLE event_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_EVENT_HPP
diff --git a/ext/asio/detail/win_fd_set_adapter.hpp b/ext/asio/detail/win_fd_set_adapter.hpp
new file mode 100644
index 0000000000..012a10ff76
--- /dev/null
+++ b/ext/asio/detail/win_fd_set_adapter.hpp
@@ -0,0 +1,88 @@
+//
+// win_fd_set_adapter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_FD_SET_ADAPTER_HPP
+#define ASIO_DETAIL_WIN_FD_SET_ADAPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/socket_types.hpp"
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+namespace asio {
+namespace detail {
+
+// Adapts the FD_SET type to meet the Descriptor_Set concept's requirements.
+class win_fd_set_adapter
+{
+public:
+  enum { win_fd_set_size = 1024 };
+
+  win_fd_set_adapter()
+    : max_descriptor_(invalid_socket)
+  {
+    fd_set_.fd_count = 0;
+  }
+
+  bool set(socket_type descriptor)
+  {
+    for (u_int i = 0; i < fd_set_.fd_count; ++i)
+      if (fd_set_.fd_array[i] == descriptor)
+        return true;
+    if (fd_set_.fd_count < win_fd_set_size)
+    {
+      fd_set_.fd_array[fd_set_.fd_count++] = descriptor;
+      return true;
+    }
+    return false;
+  }
+
+  bool is_set(socket_type descriptor) const
+  {
+    return !!__WSAFDIsSet(descriptor,
+        const_cast<fd_set*>(reinterpret_cast<const fd_set*>(&fd_set_)));
+  }
+
+  operator fd_set*()
+  {
+    return reinterpret_cast<fd_set*>(&fd_set_);
+  }
+
+  socket_type max_descriptor() const
+  {
+    return max_descriptor_;
+  }
+
+private:
+  // This structure is defined to be compatible with the Windows API fd_set
+  // structure, but without being dependent on the value of FD_SETSIZE.
+  struct win_fd_set
+  {
+    u_int fd_count;
+    SOCKET fd_array[win_fd_set_size];
+  };
+
+  win_fd_set fd_set_;
+  socket_type max_descriptor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_FD_SET_ADAPTER_HPP
diff --git a/ext/asio/detail/win_fenced_block.hpp b/ext/asio/detail/win_fenced_block.hpp
new file mode 100644
index 0000000000..6338488f91
--- /dev/null
+++ b/ext/asio/detail/win_fenced_block.hpp
@@ -0,0 +1,75 @@
+//
+// win_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
+#define ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+class win_fenced_block
+  : private noncopyable
+{
+public:
+  // Constructor.
+  win_fenced_block()
+  {
+#if defined(BOOST_MSVC) && (BOOST_MSVC < 1400)
+# if defined(_M_IX86)
+#  pragma warning(push)
+#  pragma warning(disable:4793)
+    LONG barrier;
+    __asm { xchg barrier, eax }
+#  pragma warning(pop)
+# endif // defined(_M_IX86)
+#else // defined(BOOST_MSVC) && (BOOST_MSVC < 1400)
+    MemoryBarrier();
+#endif // defined(BOOST_MSVC) && (BOOST_MSVC < 1400)
+  }
+
+  // Destructor.
+  ~win_fenced_block()
+  {
+#if defined(BOOST_MSVC) && (BOOST_MSVC < 1400)
+# if defined(_M_IX86)
+#  pragma warning(push)
+#  pragma warning(disable:4793)
+    LONG barrier;
+    __asm { xchg barrier, eax }
+#  pragma warning(pop)
+# endif // defined(_M_IX86)
+#else // defined(BOOST_MSVC) && (BOOST_MSVC < 1400)
+    MemoryBarrier();
+#endif // defined(BOOST_MSVC) && (BOOST_MSVC < 1400)
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
diff --git a/ext/asio/detail/win_iocp_handle_service.hpp b/ext/asio/detail/win_iocp_handle_service.hpp
new file mode 100644
index 0000000000..bfc159ce72
--- /dev/null
+++ b/ext/asio/detail/win_iocp_handle_service.hpp
@@ -0,0 +1,735 @@
+//
+// win_iocp_handle_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_IOCP_HANDLE_SERVICE_HPP
+#define ASIO_DETAIL_WIN_IOCP_HANDLE_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/cstdint.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/operation.hpp"
+#include "asio/detail/win_iocp_io_service.hpp"
+
+namespace asio {
+namespace detail {
+
+class win_iocp_handle_service
+{
+public:
+  // The native type of a stream handle.
+  typedef HANDLE native_type;
+
+  // The implementation type of the stream handle.
+  class implementation_type
+  {
+  public:
+    // Default constructor.
+    implementation_type()
+      : handle_(INVALID_HANDLE_VALUE),
+        safe_cancellation_thread_id_(0),
+        next_(0),
+        prev_(0)
+    {
+    }
+
+  private:
+    // Only this service will have access to the internal values.
+    friend class win_iocp_handle_service;
+
+    // The native stream handle representation.
+    native_type handle_;
+
+    // The ID of the thread from which it is safe to cancel asynchronous
+    // operations. 0 means no asynchronous operations have been started yet.
+    // ~0 means asynchronous operations have been started from more than one
+    // thread, and cancellation is not supported for the handle.
+    DWORD safe_cancellation_thread_id_;
+
+    // Pointers to adjacent handle implementations in linked list.
+    implementation_type* next_;
+    implementation_type* prev_;
+  };
+
+  win_iocp_handle_service(asio::io_service& io_service)
+    : iocp_service_(asio::use_service<win_iocp_io_service>(io_service)),
+      mutex_(),
+      impl_list_(0)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    // Close all implementations, causing all operations to complete.
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    implementation_type* impl = impl_list_;
+    while (impl)
+    {
+      close_for_destruction(*impl);
+      impl = impl->next_;
+    }
+  }
+
+  // Construct a new handle implementation.
+  void construct(implementation_type& impl)
+  {
+    impl.handle_ = INVALID_HANDLE_VALUE;
+    impl.safe_cancellation_thread_id_ = 0;
+
+    // Insert implementation into linked list of all implementations.
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    impl.next_ = impl_list_;
+    impl.prev_ = 0;
+    if (impl_list_)
+      impl_list_->prev_ = &impl;
+    impl_list_ = &impl;
+  }
+
+  // Destroy a handle implementation.
+  void destroy(implementation_type& impl)
+  {
+    close_for_destruction(impl);
+    
+    // Remove implementation from linked list of all implementations.
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    if (impl_list_ == &impl)
+      impl_list_ = impl.next_;
+    if (impl.prev_)
+      impl.prev_->next_ = impl.next_;
+    if (impl.next_)
+      impl.next_->prev_= impl.prev_;
+    impl.next_ = 0;
+    impl.prev_ = 0;
+  }
+
+  // Assign a native handle to a handle implementation.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_handle, asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    if (iocp_service_.register_handle(native_handle, ec))
+      return ec;
+
+    impl.handle_ = native_handle;
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Determine whether the handle is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return impl.handle_ != INVALID_HANDLE_VALUE;
+  }
+
+  // Destroy a handle implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      if (!::CloseHandle(impl.handle_))
+      {
+        DWORD last_error = ::GetLastError();
+        ec = asio::error_code(last_error,
+            asio::error::get_system_category());
+        return ec;
+      }
+
+      impl.handle_ = INVALID_HANDLE_VALUE;
+      impl.safe_cancellation_thread_id_ = 0;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Get the native handle representation.
+  native_type native(const implementation_type& impl) const
+  {
+    return impl.handle_;
+  }
+
+  // Cancel all operations associated with the handle.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+    }
+    else if (FARPROC cancel_io_ex_ptr = ::GetProcAddress(
+          ::GetModuleHandleA("KERNEL32"), "CancelIoEx"))
+    {
+      // The version of Windows supports cancellation from any thread.
+      typedef BOOL (WINAPI* cancel_io_ex_t)(HANDLE, LPOVERLAPPED);
+      cancel_io_ex_t cancel_io_ex = (cancel_io_ex_t)cancel_io_ex_ptr;
+      if (!cancel_io_ex(impl.handle_, 0))
+      {
+        DWORD last_error = ::GetLastError();
+        if (last_error == ERROR_NOT_FOUND)
+        {
+          // ERROR_NOT_FOUND means that there were no operations to be
+          // cancelled. We swallow this error to match the behaviour on other
+          // platforms.
+          ec = asio::error_code();
+        }
+        else
+        {
+          ec = asio::error_code(last_error,
+              asio::error::get_system_category());
+        }
+      }
+      else
+      {
+        ec = asio::error_code();
+      }
+    }
+    else if (impl.safe_cancellation_thread_id_ == 0)
+    {
+      // No operations have been started, so there's nothing to cancel.
+      ec = asio::error_code();
+    }
+    else if (impl.safe_cancellation_thread_id_ == ::GetCurrentThreadId())
+    {
+      // Asynchronous operations have been started from the current thread only,
+      // so it is safe to try to cancel them using CancelIo.
+      if (!::CancelIo(impl.handle_))
+      {
+        DWORD last_error = ::GetLastError();
+        ec = asio::error_code(last_error,
+            asio::error::get_system_category());
+      }
+      else
+      {
+        ec = asio::error_code();
+      }
+    }
+    else
+    {
+      // Asynchronous operations have been started from more than one thread,
+      // so cancellation is not safe.
+      ec = asio::error::operation_not_supported;
+    }
+
+    return ec;
+  }
+
+  class overlapped_wrapper
+    : public OVERLAPPED
+  {
+  public:
+    explicit overlapped_wrapper(asio::error_code& ec)
+    {
+      Internal = 0;
+      InternalHigh = 0;
+      Offset = 0;
+      OffsetHigh = 0;
+
+      // Create a non-signalled manual-reset event, for GetOverlappedResult.
+      hEvent = ::CreateEvent(0, TRUE, FALSE, 0);
+      if (hEvent)
+      {
+        // As documented in GetQueuedCompletionStatus, setting the low order
+        // bit of this event prevents our synchronous writes from being treated
+        // as completion port events.
+        *reinterpret_cast<DWORD_PTR*>(&hEvent) |= 1;
+      }
+      else
+      {
+        DWORD last_error = ::GetLastError();
+        ec = asio::error_code(last_error,
+            asio::error::get_system_category());
+      }
+    }
+
+    ~overlapped_wrapper()
+    {
+      if (hEvent)
+      {
+        ::CloseHandle(hEvent);
+      }
+    }
+  };
+
+  // Write the given data. Returns the number of bytes written.
+  template <typename ConstBufferSequence>
+  size_t write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return write_some_at(impl, 0, buffers, ec);
+  }
+
+  // Write the given data at the specified offset. Returns the number of bytes
+  // written.
+  template <typename ConstBufferSequence>
+  size_t write_some_at(implementation_type& impl, boost::uint64_t offset,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    asio::const_buffer buffer =
+      buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence>::first(buffers);
+
+    // A request to write 0 bytes on a handle is a no-op.
+    if (asio::buffer_size(buffer) == 0)
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    overlapped_wrapper overlapped(ec);
+    if (ec)
+    {
+      return 0;
+    }
+
+    // Write the data. 
+    overlapped.Offset = offset & 0xFFFFFFFF;
+    overlapped.OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
+    BOOL ok = ::WriteFile(impl.handle_,
+        asio::buffer_cast<LPCVOID>(buffer),
+        static_cast<DWORD>(asio::buffer_size(buffer)), 0, &overlapped);
+    if (!ok) 
+    {
+      DWORD last_error = ::GetLastError();
+      if (last_error != ERROR_IO_PENDING)
+      {
+        ec = asio::error_code(last_error,
+            asio::error::get_system_category());
+        return 0;
+      }
+    }
+
+    // Wait for the operation to complete.
+    DWORD bytes_transferred = 0;
+    ok = ::GetOverlappedResult(impl.handle_,
+        &overlapped, &bytes_transferred, TRUE);
+    if (!ok)
+    {
+      DWORD last_error = ::GetLastError();
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return 0;
+    }
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  template <typename ConstBufferSequence, typename Handler>
+  class write_op : public operation
+  {
+  public:
+    write_op(const ConstBufferSequence& buffers, Handler handler)
+      : operation(&write_op::do_complete),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t bytes_transferred)
+    {
+      // Take ownership of the operation object.
+      write_op* o(static_cast<write_op*>(base));
+      typedef handler_alloc_traits<Handler, write_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        // Check whether buffers are still valid.
+        buffer_sequence_adapter<asio::const_buffer,
+            ConstBufferSequence>::validate(o->buffers_);
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, ec, bytes_transferred);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    ConstBufferSequence buffers_;
+    Handler handler_;
+  };
+
+  // Start an asynchronous write. The data being written must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, Handler handler)
+  {
+    async_write_some_at(impl, 0, buffers, handler);
+  }
+
+  // Start an asynchronous write at a specified offset. The data being written
+  // must be valid for the lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_write_some_at(implementation_type& impl, boost::uint64_t offset,
+      const ConstBufferSequence& buffers, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef write_op<ConstBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, buffers, handler);
+
+    start_write_op(impl, offset,
+        buffer_sequence_adapter<asio::const_buffer,
+          ConstBufferSequence>::first(buffers), ptr.get());
+    ptr.release();
+  }
+
+  // Read some data. Returns the number of bytes received.
+  template <typename MutableBufferSequence>
+  size_t read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return read_some_at(impl, 0, buffers, ec);
+  }
+
+  // Read some data at a specified offset. Returns the number of bytes received.
+  template <typename MutableBufferSequence>
+  size_t read_some_at(implementation_type& impl, boost::uint64_t offset,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+    
+    asio::mutable_buffer buffer =
+      buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence>::first(buffers);
+
+    // A request to read 0 bytes on a stream handle is a no-op.
+    if (asio::buffer_size(buffer) == 0)
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    overlapped_wrapper overlapped(ec);
+    if (ec)
+    {
+      return 0;
+    }
+
+    // Read some data.
+    overlapped.Offset = offset & 0xFFFFFFFF;
+    overlapped.OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
+    BOOL ok = ::ReadFile(impl.handle_,
+        asio::buffer_cast<LPVOID>(buffer),
+        static_cast<DWORD>(asio::buffer_size(buffer)), 0, &overlapped);
+    if (!ok) 
+    {
+      DWORD last_error = ::GetLastError();
+      if (last_error != ERROR_IO_PENDING && last_error != ERROR_MORE_DATA)
+      {
+        if (last_error == ERROR_HANDLE_EOF)
+        {
+          ec = asio::error::eof;
+        }
+        else
+        {
+          ec = asio::error_code(last_error,
+              asio::error::get_system_category());
+        }
+        return 0;
+      }
+    }
+
+    // Wait for the operation to complete.
+    DWORD bytes_transferred = 0;
+    ok = ::GetOverlappedResult(impl.handle_,
+        &overlapped, &bytes_transferred, TRUE);
+    if (!ok)
+    {
+      DWORD last_error = ::GetLastError();
+      if (last_error == ERROR_HANDLE_EOF)
+      {
+        ec = asio::error::eof;
+      }
+      else
+      {
+        ec = asio::error_code(last_error,
+            asio::error::get_system_category());
+      }
+      return 0;
+    }
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  template <typename MutableBufferSequence, typename Handler>
+  class read_op : public operation
+  {
+  public:
+    read_op(const MutableBufferSequence& buffers, Handler handler)
+      : operation(&read_op::do_complete),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t bytes_transferred)
+    {
+      // Take ownership of the operation object.
+      read_op* o(static_cast<read_op*>(base));
+      typedef handler_alloc_traits<Handler, read_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        // Check whether buffers are still valid.
+        buffer_sequence_adapter<asio::mutable_buffer,
+            MutableBufferSequence>::validate(o->buffers_);
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+        // Map non-portable errors to their portable counterparts.
+        if (ec.value() == ERROR_HANDLE_EOF)
+        {
+          ec = asio::error::eof;
+        }
+
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, ec, bytes_transferred);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    MutableBufferSequence buffers_;
+    Handler handler_;
+  };
+
+  // Start an asynchronous read. The buffer for the data being received must be
+  // valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, Handler handler)
+  {
+    async_read_some_at(impl, 0, buffers, handler);
+  }
+
+  // Start an asynchronous read at a specified offset. The buffer for the data
+  // being received must be valid for the lifetime of the asynchronous
+  // operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_read_some_at(implementation_type& impl, boost::uint64_t offset,
+      const MutableBufferSequence& buffers, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef read_op<MutableBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, buffers, handler);
+
+    start_read_op(impl, offset,
+        buffer_sequence_adapter<asio::mutable_buffer,
+          MutableBufferSequence>::first(buffers), ptr.get());
+    ptr.release();
+  }
+
+private:
+  // Prevent the use of the null_buffers type with this service.
+  size_t write_some(implementation_type& impl,
+      const null_buffers& buffers, asio::error_code& ec);
+  size_t write_some_at(implementation_type& impl, boost::uint64_t offset,
+      const null_buffers& buffers, asio::error_code& ec);
+  template <typename Handler>
+  void async_write_some(implementation_type& impl,
+      const null_buffers& buffers, Handler handler);
+  template <typename Handler>
+  void async_write_some_at(implementation_type& impl, boost::uint64_t offset,
+      const null_buffers& buffers, Handler handler);
+  size_t read_some(implementation_type& impl,
+      const null_buffers& buffers, asio::error_code& ec);
+  size_t read_some_at(implementation_type& impl, boost::uint64_t offset,
+      const null_buffers& buffers, asio::error_code& ec);
+  template <typename Handler>
+  void async_read_some(implementation_type& impl,
+      const null_buffers& buffers, Handler handler);
+  template <typename Handler>
+  void async_read_some_at(implementation_type& impl, boost::uint64_t offset,
+      const null_buffers& buffers, Handler handler);
+
+  // Helper function to start a write operation.
+  void start_write_op(implementation_type& impl, boost::uint64_t offset,
+      const asio::const_buffer& buffer, operation* op)
+  {
+    update_cancellation_thread_id(impl);
+    iocp_service_.work_started();
+
+    if (!is_open(impl))
+    {
+      iocp_service_.on_completion(op, asio::error::bad_descriptor);
+    }
+    else if (asio::buffer_size(buffer) == 0)
+    {
+      // A request to write 0 bytes on a handle is a no-op.
+      iocp_service_.on_completion(op);
+    }
+    else
+    {
+      DWORD bytes_transferred = 0;
+      op->Offset = offset & 0xFFFFFFFF;
+      op->OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
+      BOOL ok = ::WriteFile(impl.handle_,
+          asio::buffer_cast<LPCVOID>(buffer),
+          static_cast<DWORD>(asio::buffer_size(buffer)),
+          &bytes_transferred, op);
+      DWORD last_error = ::GetLastError();
+      if (!ok && last_error != ERROR_IO_PENDING
+          && last_error != ERROR_MORE_DATA)
+      {
+        iocp_service_.on_completion(op, last_error, bytes_transferred);
+      }
+      else
+      {
+        iocp_service_.on_pending(op);
+      }
+    }
+  }
+
+  // Helper function to start a read operation.
+  void start_read_op(implementation_type& impl, boost::uint64_t offset,
+      const asio::mutable_buffer& buffer, operation* op)
+  {
+    update_cancellation_thread_id(impl);
+    iocp_service_.work_started();
+
+    if (!is_open(impl))
+    {
+      iocp_service_.on_completion(op, asio::error::bad_descriptor);
+    }
+    else if (asio::buffer_size(buffer) == 0)
+    {
+      // A request to read 0 bytes on a handle is a no-op.
+      iocp_service_.on_completion(op);
+    }
+    else
+    {
+      DWORD bytes_transferred = 0;
+      op->Offset = offset & 0xFFFFFFFF;
+      op->OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
+      BOOL ok = ::ReadFile(impl.handle_,
+          asio::buffer_cast<LPVOID>(buffer),
+          static_cast<DWORD>(asio::buffer_size(buffer)),
+          &bytes_transferred, op);
+      DWORD last_error = ::GetLastError();
+      if (!ok && last_error != ERROR_IO_PENDING
+          && last_error != ERROR_MORE_DATA)
+      {
+        iocp_service_.on_completion(op, last_error, bytes_transferred);
+      }
+      else
+      {
+        iocp_service_.on_pending(op);
+      }
+    }
+  }
+
+  // Update the ID of the thread from which cancellation is safe.
+  void update_cancellation_thread_id(implementation_type& impl)
+  {
+#if defined(ASIO_ENABLE_CANCELIO)
+    if (impl.safe_cancellation_thread_id_ == 0)
+      impl.safe_cancellation_thread_id_ = ::GetCurrentThreadId();
+    else if (impl.safe_cancellation_thread_id_ != ::GetCurrentThreadId())
+      impl.safe_cancellation_thread_id_ = ~DWORD(0);
+#else // defined(ASIO_ENABLE_CANCELIO)
+    (void)impl;
+#endif // defined(ASIO_ENABLE_CANCELIO)
+  }
+
+  // Helper function to close a handle when the associated object is being
+  // destroyed.
+  void close_for_destruction(implementation_type& impl)
+  {
+    if (is_open(impl))
+    {
+      ::CloseHandle(impl.handle_);
+      impl.handle_ = INVALID_HANDLE_VALUE;
+      impl.safe_cancellation_thread_id_ = 0;
+    }
+  }
+
+  // The IOCP service used for running asynchronous operations and dispatching
+  // handlers.
+  win_iocp_io_service& iocp_service_;
+
+  // Mutex to protect access to the linked list of implementations.
+  asio::detail::mutex mutex_;
+
+  // The head of a linked list of all implementations.
+  implementation_type* impl_list_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_IOCP_HANDLE_SERVICE_HPP
diff --git a/ext/asio/detail/win_iocp_io_service.hpp b/ext/asio/detail/win_iocp_io_service.hpp
new file mode 100644
index 0000000000..fd899c1146
--- /dev/null
+++ b/ext/asio/detail/win_iocp_io_service.hpp
@@ -0,0 +1,686 @@
+//
+// win_iocp_io_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_IOCP_IO_SERVICE_HPP
+#define ASIO_DETAIL_WIN_IOCP_IO_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/limits.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/call_stack.hpp"
+#include "asio/detail/completion_handler.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/timer_op.hpp"
+#include "asio/detail/timer_queue_base.hpp"
+#include "asio/detail/timer_queue_fwd.hpp"
+#include "asio/detail/timer_queue_set.hpp"
+#include "asio/detail/win_iocp_operation.hpp"
+
+namespace asio {
+namespace detail {
+
+class timer_op;
+
+class win_iocp_io_service
+  : public asio::detail::service_base<win_iocp_io_service>
+{
+public:
+  typedef win_iocp_operation operation;
+
+  // Constructor.
+  win_iocp_io_service(asio::io_service& io_service)
+    : asio::detail::service_base<win_iocp_io_service>(io_service),
+      iocp_(),
+      outstanding_work_(0),
+      stopped_(0),
+      shutdown_(0),
+      timer_thread_(0),
+      timer_interrupt_issued_(false)
+  {
+  }
+
+  void init(size_t concurrency_hint)
+  {
+    iocp_.handle = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, 0, 0,
+        static_cast<DWORD>((std::min<size_t>)(concurrency_hint, DWORD(~0))));
+    if (!iocp_.handle)
+    {
+      DWORD last_error = ::GetLastError();
+      asio::system_error e(
+          asio::error_code(last_error,
+            asio::error::get_system_category()),
+          "iocp");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    ::InterlockedExchange(&shutdown_, 1);
+
+    while (::InterlockedExchangeAdd(&outstanding_work_, 0) > 0)
+    {
+      op_queue<operation> ops;
+      timer_queues_.get_all_timers(ops);
+      ops.push(completed_ops_);
+      if (!ops.empty())
+      {
+        while (operation* op = ops.front())
+        {
+          ops.pop();
+          ::InterlockedDecrement(&outstanding_work_);
+          op->destroy();
+        }
+      }
+      else
+      {
+        DWORD bytes_transferred = 0;
+        dword_ptr_t completion_key = 0;
+        LPOVERLAPPED overlapped = 0;
+        ::GetQueuedCompletionStatus(iocp_.handle, &bytes_transferred,
+            &completion_key, &overlapped, max_timeout);
+        if (overlapped)
+        {
+          ::InterlockedDecrement(&outstanding_work_);
+          static_cast<operation*>(overlapped)->destroy();
+        }
+      }
+    }
+  }
+
+  // Initialise the task. Nothing to do here.
+  void init_task()
+  {
+  }
+
+  // Register a handle with the IO completion port.
+  asio::error_code register_handle(
+      HANDLE handle, asio::error_code& ec)
+  {
+    if (::CreateIoCompletionPort(handle, iocp_.handle, 0, 0) == 0)
+    {
+      DWORD last_error = ::GetLastError();
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+    }
+    else
+    {
+      ec = asio::error_code();
+    }
+    return ec;
+  }
+
+  // Run the event loop until stopped or no more work.
+  size_t run(asio::error_code& ec)
+  {
+    if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0)
+    {
+      stop();
+      ec = asio::error_code();
+      return 0;
+    }
+
+    call_stack<win_iocp_io_service>::context ctx(this);
+
+    size_t n = 0;
+    while (do_one(true, ec))
+      if (n != (std::numeric_limits<size_t>::max)())
+        ++n;
+    return n;
+  }
+
+  // Run until stopped or one operation is performed.
+  size_t run_one(asio::error_code& ec)
+  {
+    if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0)
+    {
+      stop();
+      ec = asio::error_code();
+      return 0;
+    }
+
+    call_stack<win_iocp_io_service>::context ctx(this);
+
+    return do_one(true, ec);
+  }
+
+  // Poll for operations without blocking.
+  size_t poll(asio::error_code& ec)
+  {
+    if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0)
+    {
+      stop();
+      ec = asio::error_code();
+      return 0;
+    }
+
+    call_stack<win_iocp_io_service>::context ctx(this);
+
+    size_t n = 0;
+    while (do_one(false, ec))
+      if (n != (std::numeric_limits<size_t>::max)())
+        ++n;
+    return n;
+  }
+
+  // Poll for one operation without blocking.
+  size_t poll_one(asio::error_code& ec)
+  {
+    if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0)
+    {
+      stop();
+      ec = asio::error_code();
+      return 0;
+    }
+
+    call_stack<win_iocp_io_service>::context ctx(this);
+
+    return do_one(false, ec);
+  }
+
+  // Stop the event processing loop.
+  void stop()
+  {
+    if (::InterlockedExchange(&stopped_, 1) == 0)
+    {
+      if (!::PostQueuedCompletionStatus(iocp_.handle, 0, 0, 0))
+      {
+        DWORD last_error = ::GetLastError();
+        asio::system_error e(
+            asio::error_code(last_error,
+              asio::error::get_system_category()),
+            "pqcs");
+        boost::throw_exception(e);
+      }
+    }
+  }
+
+  // Reset in preparation for a subsequent run invocation.
+  void reset()
+  {
+    ::InterlockedExchange(&stopped_, 0);
+  }
+
+  // Notify that some work has started.
+  void work_started()
+  {
+    ::InterlockedIncrement(&outstanding_work_);
+  }
+
+  // Notify that some work has finished.
+  void work_finished()
+  {
+    if (::InterlockedDecrement(&outstanding_work_) == 0)
+      stop();
+  }
+
+  // Request invocation of the given handler.
+  template <typename Handler>
+  void dispatch(Handler handler)
+  {
+    if (call_stack<win_iocp_io_service>::contains(this))
+    {
+      asio::detail::fenced_block b;
+      asio_handler_invoke_helpers::invoke(handler, handler);
+    }
+    else
+      post(handler);
+  }
+
+  // Request invocation of the given handler and return immediately.
+  template <typename Handler>
+  void post(Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef completion_handler<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    post_immediate_completion(ptr.get());
+    ptr.release();
+  }
+
+  // Request invocation of the given operation and return immediately. Assumes
+  // that work_started() has not yet been called for the operation.
+  void post_immediate_completion(operation* op)
+  {
+    work_started();
+    post_deferred_completion(op);
+  }
+
+  // Request invocation of the given operation and return immediately. Assumes
+  // that work_started() was previously called for the operation.
+  void post_deferred_completion(operation* op)
+  {
+    // Flag the operation as ready.
+    op->ready_ = 1;
+
+    // Enqueue the operation on the I/O completion port.
+    if (!::PostQueuedCompletionStatus(iocp_.handle,
+          0, overlapped_contains_result, op))
+    {
+      // Out of resources. Put on completed queue instead.
+      asio::detail::mutex::scoped_lock lock(timer_mutex_);
+      completed_ops_.push(op);
+    }
+  }
+
+  // Request invocation of the given operation and return immediately. Assumes
+  // that work_started() was previously called for the operations.
+  void post_deferred_completions(op_queue<operation>& ops)
+  {
+    while (operation* op = ops.front())
+    {
+      ops.pop();
+
+      // Flag the operation as ready.
+      op->ready_ = 1;
+
+      // Enqueue the operation on the I/O completion port.
+      if (!::PostQueuedCompletionStatus(iocp_.handle,
+            0, overlapped_contains_result, op))
+      {
+        // Out of resources. Put on completed queue instead.
+        asio::detail::mutex::scoped_lock lock(timer_mutex_);
+        completed_ops_.push(op);
+        completed_ops_.push(ops);
+      }
+    }
+  }
+
+  // Called after starting an overlapped I/O operation that did not complete
+  // immediately. The caller must have already called work_started() prior to
+  // starting the operation.
+  void on_pending(operation* op)
+  {
+    if (::InterlockedCompareExchange(&op->ready_, 1, 0) == 1)
+    {
+      // Enqueue the operation on the I/O completion port.
+      if (!::PostQueuedCompletionStatus(iocp_.handle,
+            0, overlapped_contains_result, op))
+      {
+        // Out of resources. Put on completed queue instead.
+        asio::detail::mutex::scoped_lock lock(timer_mutex_);
+        completed_ops_.push(op);
+      }
+    }
+  }
+
+  // Called after starting an overlapped I/O operation that completed
+  // immediately. The caller must have already called work_started() prior to
+  // starting the operation.
+  void on_completion(operation* op,
+      DWORD last_error = 0, DWORD bytes_transferred = 0)
+  {
+    // Flag that the operation is ready for invocation.
+    op->ready_ = 1;
+
+    // Store results in the OVERLAPPED structure.
+    op->Internal = asio::error::get_system_category();
+    op->Offset = last_error;
+    op->OffsetHigh = bytes_transferred;
+
+    // Enqueue the operation on the I/O completion port.
+    if (!::PostQueuedCompletionStatus(iocp_.handle,
+          0, overlapped_contains_result, op))
+    {
+      // Out of resources. Put on completed queue instead.
+      asio::detail::mutex::scoped_lock lock(timer_mutex_);
+      completed_ops_.push(op);
+    }
+  }
+
+  // Called after starting an overlapped I/O operation that completed
+  // immediately. The caller must have already called work_started() prior to
+  // starting the operation.
+  void on_completion(operation* op,
+      const asio::error_code& ec, DWORD bytes_transferred = 0)
+  {
+    // Flag that the operation is ready for invocation.
+    op->ready_ = 1;
+
+    // Store results in the OVERLAPPED structure.
+    op->Internal = ec.category();
+    op->Offset = ec.value();
+    op->OffsetHigh = bytes_transferred;
+
+    // Enqueue the operation on the I/O completion port.
+    if (!::PostQueuedCompletionStatus(iocp_.handle,
+          0, overlapped_contains_result, op))
+    {
+      // Out of resources. Put on completed queue instead.
+      asio::detail::mutex::scoped_lock lock(timer_mutex_);
+      completed_ops_.push(op);
+    }
+  }
+
+  // Add a new timer queue to the service.
+  template <typename Time_Traits>
+  void add_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    asio::detail::mutex::scoped_lock lock(timer_mutex_);
+    timer_queues_.insert(&timer_queue);
+  }
+
+  // Remove a timer queue from the service.
+  template <typename Time_Traits>
+  void remove_timer_queue(timer_queue<Time_Traits>& timer_queue)
+  {
+    asio::detail::mutex::scoped_lock lock(timer_mutex_);
+    timer_queues_.erase(&timer_queue);
+  }
+
+  // Schedule a new operation in the given timer queue to expire at the
+  // specified absolute time.
+  template <typename Time_Traits>
+  void schedule_timer(timer_queue<Time_Traits>& timer_queue,
+      const typename Time_Traits::time_type& time, timer_op* op, void* token)
+  {
+    // If the service has been shut down we silently discard the timer.
+    if (::InterlockedExchangeAdd(&shutdown_, 0) != 0)
+      return;
+
+    asio::detail::mutex::scoped_lock lock(timer_mutex_);
+    bool interrupt = timer_queue.enqueue_timer(time, op, token);
+    work_started();
+    if (interrupt && !timer_interrupt_issued_)
+    {
+      timer_interrupt_issued_ = true;
+      lock.unlock();
+      ::PostQueuedCompletionStatus(iocp_.handle,
+          0, steal_timer_dispatching, 0);
+    }
+  }
+
+  // Cancel the timer associated with the given token. Returns the number of
+  // handlers that have been posted or dispatched.
+  template <typename Time_Traits>
+  std::size_t cancel_timer(timer_queue<Time_Traits>& timer_queue, void* token)
+  {
+    // If the service has been shut down we silently ignore the cancellation.
+    if (::InterlockedExchangeAdd(&shutdown_, 0) != 0)
+      return 0;
+
+    asio::detail::mutex::scoped_lock lock(timer_mutex_);
+    op_queue<operation> ops;
+    std::size_t n = timer_queue.cancel_timer(token, ops);
+    post_deferred_completions(ops);
+    if (n > 0 && !timer_interrupt_issued_)
+    {
+      timer_interrupt_issued_ = true;
+      lock.unlock();
+      ::PostQueuedCompletionStatus(iocp_.handle,
+          0, steal_timer_dispatching, 0);
+    }
+    return n;
+  }
+
+private:
+#if defined(WINVER) && (WINVER < 0x0500)
+  typedef DWORD dword_ptr_t;
+  typedef ULONG ulong_ptr_t;
+#else // defined(WINVER) && (WINVER < 0x0500)
+  typedef DWORD_PTR dword_ptr_t;
+  typedef ULONG_PTR ulong_ptr_t;
+#endif // defined(WINVER) && (WINVER < 0x0500)
+
+  // Dequeues at most one operation from the I/O completion port, and then
+  // executes it. Returns the number of operations that were dequeued (i.e.
+  // either 0 or 1).
+  size_t do_one(bool block, asio::error_code& ec)
+  {
+    long this_thread_id = static_cast<long>(::GetCurrentThreadId());
+
+    for (;;)
+    {
+      // Try to acquire responsibility for dispatching timers.
+      bool dispatching_timers = (::InterlockedCompareExchange(
+            &timer_thread_, this_thread_id, 0) == 0);
+
+      // Calculate timeout for GetQueuedCompletionStatus call.
+      DWORD timeout = max_timeout;
+      if (dispatching_timers)
+      {
+        asio::detail::mutex::scoped_lock lock(timer_mutex_);
+        timer_interrupt_issued_ = false;
+        timeout = get_timeout();
+      }
+
+      // Get the next operation from the queue.
+      DWORD bytes_transferred = 0;
+      dword_ptr_t completion_key = 0;
+      LPOVERLAPPED overlapped = 0;
+      ::SetLastError(0);
+      BOOL ok = ::GetQueuedCompletionStatus(iocp_.handle, &bytes_transferred,
+          &completion_key, &overlapped, block ? timeout : 0);
+      DWORD last_error = ::GetLastError();
+
+      // Dispatch any pending timers.
+      if (dispatching_timers)
+      {
+        asio::detail::mutex::scoped_lock lock(timer_mutex_);
+        op_queue<operation> ops;
+        ops.push(completed_ops_);
+        timer_queues_.get_ready_timers(ops);
+        post_deferred_completions(ops);
+      }
+
+      if (!ok && overlapped == 0)
+      {
+        if (block && last_error == WAIT_TIMEOUT)
+        {
+          // Relinquish responsibility for dispatching timers.
+          if (dispatching_timers)
+          {
+            ::InterlockedCompareExchange(&timer_thread_, 0, this_thread_id);
+          }
+
+          continue;
+        }
+
+        // Transfer responsibility for dispatching timers to another thread.
+        if (dispatching_timers && ::InterlockedCompareExchange(
+              &timer_thread_, 0, this_thread_id) == this_thread_id)
+        {
+          ::PostQueuedCompletionStatus(iocp_.handle,
+              0, transfer_timer_dispatching, 0);
+        }
+
+        ec = asio::error_code();
+        return 0;
+      }
+      else if (overlapped)
+      {
+        operation* op = static_cast<operation*>(overlapped);
+        asio::error_code result_ec(last_error,
+            asio::error::get_system_category());
+
+        // Transfer responsibility for dispatching timers to another thread.
+        if (dispatching_timers && ::InterlockedCompareExchange(
+              &timer_thread_, 0, this_thread_id) == this_thread_id)
+        {
+          ::PostQueuedCompletionStatus(iocp_.handle,
+              0, transfer_timer_dispatching, 0);
+        }
+
+        // We may have been passed the last_error and bytes_transferred in the
+        // OVERLAPPED structure itself.
+        if (completion_key == overlapped_contains_result)
+        {
+          result_ec = asio::error_code(static_cast<int>(op->Offset),
+              static_cast<asio::error_category>(op->Internal));
+          bytes_transferred = op->OffsetHigh;
+        }
+
+        // Otherwise ensure any result has been saved into the OVERLAPPED
+        // structure.
+        else
+        {
+          op->Internal = result_ec.category();
+          op->Offset = result_ec.value();
+          op->OffsetHigh = bytes_transferred;
+        }
+
+        // Dispatch the operation only if ready. The operation may not be ready
+        // if the initiating function (e.g. a call to WSARecv) has not yet
+        // returned. This is because the initiating function still wants access
+        // to the operation's OVERLAPPED structure.
+        if (::InterlockedCompareExchange(&op->ready_, 1, 0) == 1)
+        {
+          // Ensure the count of outstanding work is decremented on block exit.
+          work_finished_on_block_exit on_exit = { this };
+          (void)on_exit;
+
+          op->complete(*this, result_ec, bytes_transferred);
+          ec = asio::error_code();
+          return 1;
+        }
+      }
+      else if (completion_key == transfer_timer_dispatching)
+      {
+        // Woken up to try to acquire responsibility for dispatching timers.
+        ::InterlockedCompareExchange(&timer_thread_, 0, this_thread_id);
+      }
+      else if (completion_key == steal_timer_dispatching)
+      {
+        // Woken up to steal responsibility for dispatching timers.
+        ::InterlockedExchange(&timer_thread_, 0);
+      }
+      else
+      {
+        // Relinquish responsibility for dispatching timers. If the io_service
+        // is not being stopped then the thread will get an opportunity to
+        // reacquire timer responsibility on the next loop iteration.
+        if (dispatching_timers)
+        {
+          ::InterlockedCompareExchange(&timer_thread_, 0, this_thread_id);
+        }
+
+        // The stopped_ flag is always checked to ensure that any leftover
+        // interrupts from a previous run invocation are ignored.
+        if (::InterlockedExchangeAdd(&stopped_, 0) != 0)
+        {
+          // Wake up next thread that is blocked on GetQueuedCompletionStatus.
+          if (!::PostQueuedCompletionStatus(iocp_.handle, 0, 0, 0))
+          {
+            last_error = ::GetLastError();
+            ec = asio::error_code(last_error,
+                asio::error::get_system_category());
+            return 0;
+          }
+
+          ec = asio::error_code();
+          return 0;
+        }
+      }
+    }
+  }
+
+  // Get the timeout value for the GetQueuedCompletionStatus call. The timeout
+  // value is returned as a number of milliseconds. We will wait no longer than
+  // 1000 milliseconds.
+  DWORD get_timeout()
+  {
+    return timer_queues_.wait_duration_msec(max_timeout);
+  }
+
+  // Helper class to call work_finished() on block exit.
+  struct work_finished_on_block_exit
+  {
+    ~work_finished_on_block_exit()
+    {
+      io_service_->work_finished();
+    }
+
+    win_iocp_io_service* io_service_;
+  };
+
+  // The IO completion port used for queueing operations.
+  struct iocp_holder
+  {
+    HANDLE handle;
+    iocp_holder() : handle(0) {}
+    ~iocp_holder() { if (handle) ::CloseHandle(handle); }
+  } iocp_;
+
+  // The count of unfinished work.
+  long outstanding_work_;
+
+  // Flag to indicate whether the event loop has been stopped.
+  long stopped_;
+
+  // Flag to indicate whether the service has been shut down.
+  long shutdown_;
+
+  enum
+  {
+    // Maximum GetQueuedCompletionStatus timeout, in milliseconds.
+    max_timeout = 500,
+
+    // Completion key value to indicate that responsibility for dispatching
+    // timers is being cooperatively transferred from one thread to another.
+    transfer_timer_dispatching = 1,
+
+    // Completion key value to indicate that responsibility for dispatching
+    // timers should be stolen from another thread.
+    steal_timer_dispatching = 2,
+
+    // Completion key value to indicate that an operation has posted with the
+    // original last_error and bytes_transferred values stored in the fields of
+    // the OVERLAPPED structure.
+    overlapped_contains_result = 3
+  };
+
+  // The thread that's currently in charge of dispatching timers.
+  long timer_thread_;
+
+  // Mutex for protecting access to the timer queues.
+  mutex timer_mutex_;
+
+  // Whether a thread has been interrupted to process a new timeout.
+  bool timer_interrupt_issued_;
+
+  // The timer queues.
+  timer_queue_set timer_queues_;
+
+  // The operations that are ready to dispatch.
+  op_queue<operation> completed_ops_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_IOCP_IO_SERVICE_HPP
diff --git a/ext/asio/detail/win_iocp_io_service_fwd.hpp b/ext/asio/detail/win_iocp_io_service_fwd.hpp
new file mode 100644
index 0000000000..29d2a05481
--- /dev/null
+++ b/ext/asio/detail/win_iocp_io_service_fwd.hpp
@@ -0,0 +1,51 @@
+//
+// win_iocp_io_service_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_IOCP_IO_SERVICE_FWD_HPP
+#define ASIO_DETAIL_WIN_IOCP_IO_SERVICE_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/socket_types.hpp"
+
+// This service is only supported on Win32 (NT4 and later).
+#if !defined(ASIO_DISABLE_IOCP)
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+#if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0400)
+#if !defined(UNDER_CE)
+
+// Define this to indicate that IOCP is supported on the target platform.
+#define ASIO_HAS_IOCP 1
+
+namespace asio {
+namespace detail {
+
+class win_iocp_io_service;
+class win_iocp_overlapped_ptr;
+
+} // namespace detail
+} // namespace asio
+
+#endif // !defined(UNDER_CE)
+#endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0400)
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+#endif // !defined(ASIO_DISABLE_IOCP)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_IOCP_IO_SERVICE_FWD_HPP
diff --git a/ext/asio/detail/win_iocp_operation.hpp b/ext/asio/detail/win_iocp_operation.hpp
new file mode 100644
index 0000000000..ac8106255a
--- /dev/null
+++ b/ext/asio/detail/win_iocp_operation.hpp
@@ -0,0 +1,89 @@
+//
+// win_iocp_operation.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
+#define ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+
+#include "asio/error_code.hpp"
+#include "asio/detail/op_queue.hpp"
+
+namespace asio {
+namespace detail {
+
+// Base class for all operations. A function pointer is used instead of virtual
+// functions to avoid the associated overhead.
+class win_iocp_operation
+  : public OVERLAPPED
+{
+public:
+  void complete(win_iocp_io_service& owner,
+      const asio::error_code& ec = asio::error_code(),
+      std::size_t bytes_transferred = 0)
+  {
+    func_(&owner, this, ec, bytes_transferred);
+  }
+
+  void destroy()
+  {
+    func_(0, this, asio::error_code(), 0);
+  }
+
+protected:
+  typedef void (*func_type)(win_iocp_io_service*,
+      win_iocp_operation*, asio::error_code, std::size_t);
+
+  win_iocp_operation(func_type func)
+    : next_(0),
+      func_(func)
+  {
+    reset();
+  }
+
+  // Prevents deletion through this type.
+  ~win_iocp_operation()
+  {
+  }
+
+  void reset()
+  {
+    Internal = 0;
+    InternalHigh = 0;
+    Offset = 0;
+    OffsetHigh = 0;
+    hEvent = 0;
+    ready_ = 0;
+  }
+
+private:
+  friend class op_queue_access;
+  friend class win_iocp_io_service;
+  win_iocp_operation* next_;
+  func_type func_;
+  long ready_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
diff --git a/ext/asio/detail/win_iocp_overlapped_ptr.hpp b/ext/asio/detail/win_iocp_overlapped_ptr.hpp
new file mode 100644
index 0000000000..47a3f70cf1
--- /dev/null
+++ b/ext/asio/detail/win_iocp_overlapped_ptr.hpp
@@ -0,0 +1,174 @@
+//
+// win_iocp_overlapped_ptr.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
+#define ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/win_iocp_io_service.hpp"
+#include "asio/detail/win_iocp_operation.hpp"
+
+namespace asio {
+namespace detail {
+
+// Wraps a handler to create an OVERLAPPED object for use with overlapped I/O.
+class win_iocp_overlapped_ptr
+  : private noncopyable
+{
+public:
+  // Construct an empty win_iocp_overlapped_ptr.
+  win_iocp_overlapped_ptr()
+    : ptr_(0),
+      iocp_service_(0)
+  {
+  }
+
+  // Construct an win_iocp_overlapped_ptr to contain the specified handler.
+  template <typename Handler>
+  explicit win_iocp_overlapped_ptr(
+      asio::io_service& io_service, Handler handler)
+    : ptr_(0),
+      iocp_service_(0)
+  {
+    this->reset(io_service, handler);
+  }
+
+  // Destructor automatically frees the OVERLAPPED object unless released.
+  ~win_iocp_overlapped_ptr()
+  {
+    reset();
+  }
+
+  // Reset to empty.
+  void reset()
+  {
+    if (ptr_)
+    {
+      ptr_->destroy();
+      ptr_ = 0;
+      iocp_service_->work_finished();
+      iocp_service_ = 0;
+    }
+  }
+
+  // Reset to contain the specified handler, freeing any current OVERLAPPED
+  // object.
+  template <typename Handler>
+  void reset(asio::io_service& io_service, Handler handler)
+  {
+    typedef overlapped_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+    io_service.impl_.work_started();
+    reset();
+    ptr_ = ptr.release();
+    iocp_service_ = &io_service.impl_;
+  }
+
+  // Get the contained OVERLAPPED object.
+  OVERLAPPED* get()
+  {
+    return ptr_;
+  }
+
+  // Get the contained OVERLAPPED object.
+  const OVERLAPPED* get() const
+  {
+    return ptr_;
+  }
+
+  // Release ownership of the OVERLAPPED object.
+  OVERLAPPED* release()
+  {
+    if (ptr_)
+      iocp_service_->on_pending(ptr_);
+
+    OVERLAPPED* tmp = ptr_;
+    ptr_ = 0;
+    iocp_service_ = 0;
+    return tmp;
+  }
+
+  // Post completion notification for overlapped operation. Releases ownership.
+  void complete(const asio::error_code& ec,
+      std::size_t bytes_transferred)
+  {
+    if (ptr_)
+    {
+      iocp_service_->on_completion(ptr_, ec,
+          static_cast<DWORD>(bytes_transferred));
+      ptr_ = 0;
+      iocp_service_ = 0;
+    }
+  }
+
+private:
+  template <typename Handler>
+  struct overlapped_op : public win_iocp_operation
+  {
+    overlapped_op(Handler handler)
+      : win_iocp_operation(&overlapped_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t bytes_transferred)
+    {
+      // Take ownership of the operation object.
+      overlapped_op* o(static_cast<overlapped_op*>(base));
+      typedef handler_alloc_traits<Handler, overlapped_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, ec, bytes_transferred);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  win_iocp_operation* ptr_;
+  win_iocp_io_service* iocp_service_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
diff --git a/ext/asio/detail/win_iocp_serial_port_service.hpp b/ext/asio/detail/win_iocp_serial_port_service.hpp
new file mode 100644
index 0000000000..ed5f75e91c
--- /dev/null
+++ b/ext/asio/detail/win_iocp_serial_port_service.hpp
@@ -0,0 +1,288 @@
+//
+// win_iocp_serial_port_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_IOCP_SERIAL_PORT_SERVICE_HPP
+#define ASIO_DETAIL_WIN_IOCP_SERIAL_PORT_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstring>
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/win_iocp_handle_service.hpp"
+
+namespace asio {
+namespace detail {
+
+// Extend win_iocp_handle_service to provide serial port support.
+class win_iocp_serial_port_service
+{
+public:
+  // The native type of a stream handle.
+  typedef win_iocp_handle_service::native_type native_type;
+
+  // The implementation type of the stream handle.
+  typedef win_iocp_handle_service::implementation_type implementation_type;
+
+  win_iocp_serial_port_service(asio::io_service& io_service)
+    : handle_service_(io_service)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  // Construct a new handle implementation.
+  void construct(implementation_type& impl)
+  {
+    handle_service_.construct(impl);
+  }
+
+  // Destroy a handle implementation.
+  void destroy(implementation_type& impl)
+  {
+    handle_service_.destroy(impl);
+  }
+
+  // Open the serial port using the specified device name.
+  asio::error_code open(implementation_type& impl,
+      const std::string& device, asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    // For convenience, add a leading \\.\ sequence if not already present.
+    std::string name = (device[0] == '\\') ? device : "\\\\.\\" + device;
+
+    // Open a handle to the serial port.
+    ::HANDLE handle = ::CreateFileA(name.c_str(),
+        GENERIC_READ | GENERIC_WRITE, 0, 0,
+        OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
+    if (handle == INVALID_HANDLE_VALUE)
+    {
+      DWORD last_error = ::GetLastError();
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    // Determine the initial serial port parameters.
+    using namespace std; // For memcpy.
+    ::DCB dcb;
+    memset(&dcb, 0, sizeof(DCB));
+    dcb.DCBlength = sizeof(DCB);
+    if (!::GetCommState(handle, &dcb))
+    {
+      DWORD last_error = ::GetLastError();
+      ::CloseHandle(handle);
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    // Set some default serial port parameters. This implementation does not
+    // support changing these, so they might as well be in a known state.
+    dcb.fBinary = TRUE; // Win32 only supports binary mode.
+    dcb.fDsrSensitivity = FALSE;
+    dcb.fNull = FALSE; // Do not ignore NULL characters.
+    dcb.fAbortOnError = FALSE; // Ignore serial framing errors.
+    if (!::SetCommState(handle, &dcb))
+    {
+      DWORD last_error = ::GetLastError();
+      ::CloseHandle(handle);
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    // Set up timeouts so that the serial port will behave similarly to a
+    // network socket. Reads wait for at least one byte, then return with
+    // whatever they have. Writes return once everything is out the door.
+    ::COMMTIMEOUTS timeouts;
+    timeouts.ReadIntervalTimeout = 1;
+    timeouts.ReadTotalTimeoutMultiplier = 0;
+    timeouts.ReadTotalTimeoutConstant = 0;
+    timeouts.WriteTotalTimeoutMultiplier = 0;
+    timeouts.WriteTotalTimeoutConstant = 0;
+    if (!::SetCommTimeouts(handle, &timeouts))
+    {
+      DWORD last_error = ::GetLastError();
+      ::CloseHandle(handle);
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    // We're done. Take ownership of the serial port handle.
+    if (handle_service_.assign(impl, handle, ec))
+      ::CloseHandle(handle);
+    return ec;
+  }
+
+  // Assign a native handle to a handle implementation.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_handle, asio::error_code& ec)
+  {
+    return handle_service_.assign(impl, native_handle, ec);
+  }
+
+  // Determine whether the handle is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return handle_service_.is_open(impl);
+  }
+
+  // Destroy a handle implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return handle_service_.close(impl, ec);
+  }
+
+  // Get the native handle representation.
+  native_type native(implementation_type& impl)
+  {
+    return handle_service_.native(impl);
+  }
+
+  // Cancel all operations associated with the handle.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return handle_service_.cancel(impl, ec);
+  }
+
+  // Set an option on the serial port.
+  template <typename SettableSerialPortOption>
+  asio::error_code set_option(implementation_type& impl,
+      const SettableSerialPortOption& option, asio::error_code& ec)
+  {
+    using namespace std; // For memcpy.
+
+    ::DCB dcb;
+    memset(&dcb, 0, sizeof(DCB));
+    dcb.DCBlength = sizeof(DCB);
+    if (!::GetCommState(handle_service_.native(impl), &dcb))
+    {
+      DWORD last_error = ::GetLastError();
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    if (option.store(dcb, ec))
+      return ec;
+
+    if (!::SetCommState(handle_service_.native(impl), &dcb))
+    {
+      DWORD last_error = ::GetLastError();
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Get an option from the serial port.
+  template <typename GettableSerialPortOption>
+  asio::error_code get_option(const implementation_type& impl,
+      GettableSerialPortOption& option, asio::error_code& ec) const
+  {
+    using namespace std; // For memcpy.
+
+    ::DCB dcb;
+    memset(&dcb, 0, sizeof(DCB));
+    dcb.DCBlength = sizeof(DCB);
+    if (!::GetCommState(handle_service_.native(impl), &dcb))
+    {
+      DWORD last_error = ::GetLastError();
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return ec;
+    }
+
+    return option.load(dcb, ec);
+  }
+
+  // Send a break sequence to the serial port.
+  asio::error_code send_break(implementation_type&,
+      asio::error_code& ec)
+  {
+    ec = asio::error::operation_not_supported;
+    return ec;
+  }
+
+  // Write the given data. Returns the number of bytes sent.
+  template <typename ConstBufferSequence>
+  size_t write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return handle_service_.write_some(impl, buffers, ec);
+  }
+
+  // Start an asynchronous write. The data being written must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, Handler handler)
+  {
+    handle_service_.async_write_some(impl, buffers, handler);
+  }
+
+  // Read some data. Returns the number of bytes received.
+  template <typename MutableBufferSequence>
+  size_t read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return handle_service_.read_some(impl, buffers, ec);
+  }
+
+  // Start an asynchronous read. The buffer for the data being received must be
+  // valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, Handler handler)
+  {
+    handle_service_.async_read_some(impl, buffers, handler);
+  }
+
+private:
+  // The implementation used for initiating asynchronous operations.
+  win_iocp_handle_service handle_service_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_IOCP_SERIAL_PORT_SERVICE_HPP
diff --git a/ext/asio/detail/win_iocp_socket_service.hpp b/ext/asio/detail/win_iocp_socket_service.hpp
new file mode 100644
index 0000000000..cb1d2037de
--- /dev/null
+++ b/ext/asio/detail/win_iocp_socket_service.hpp
@@ -0,0 +1,2010 @@
+//
+// win_iocp_socket_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_HPP
+#define ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/push_options.hpp"
+#include <cstring>
+#include <boost/shared_ptr.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/weak_ptr.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/socket_base.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/null_buffers_op.hpp"
+#include "asio/detail/operation.hpp"
+#include "asio/detail/reactor.hpp"
+#include "asio/detail/reactor_op.hpp"
+#include "asio/detail/socket_holder.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/win_iocp_io_service.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class win_iocp_socket_service
+{
+public:
+  // The protocol type.
+  typedef Protocol protocol_type;
+
+  // The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  struct noop_deleter { void operator()(void*) {} };
+  typedef boost::shared_ptr<void> shared_cancel_token_type;
+  typedef boost::weak_ptr<void> weak_cancel_token_type;
+
+  // The native type of a socket.
+  class native_type
+  {
+  public:
+    native_type(socket_type s)
+      : socket_(s),
+        have_remote_endpoint_(false)
+    {
+    }
+
+    native_type(socket_type s, const endpoint_type& ep)
+      : socket_(s),
+        have_remote_endpoint_(true),
+        remote_endpoint_(ep)
+    {
+    }
+
+    void operator=(socket_type s)
+    {
+      socket_ = s;
+      have_remote_endpoint_ = false;
+      remote_endpoint_ = endpoint_type();
+    }
+
+    operator socket_type() const
+    {
+      return socket_;
+    }
+
+    HANDLE as_handle() const
+    {
+      return reinterpret_cast<HANDLE>(socket_);
+    }
+
+    bool have_remote_endpoint() const
+    {
+      return have_remote_endpoint_;
+    }
+
+    endpoint_type remote_endpoint() const
+    {
+      return remote_endpoint_;
+    }
+
+  private:
+    socket_type socket_;
+    bool have_remote_endpoint_;
+    endpoint_type remote_endpoint_;
+  };
+
+  // The implementation type of the socket.
+  class implementation_type
+  {
+  public:
+    // Default constructor.
+    implementation_type()
+      : socket_(invalid_socket),
+        flags_(0),
+        cancel_token_(),
+        protocol_(endpoint_type().protocol()),
+        next_(0),
+        prev_(0)
+    {
+    }
+
+  private:
+    // Only this service will have access to the internal values.
+    friend class win_iocp_socket_service;
+
+    // The native socket representation.
+    native_type socket_;
+
+    enum
+    {
+      enable_connection_aborted = 1, // User wants connection_aborted errors.
+      close_might_block = 2, // User set linger option for blocking close.
+      user_set_non_blocking = 4 // The user wants a non-blocking socket.
+    };
+
+    // Flags indicating the current state of the socket.
+    unsigned char flags_;
+
+    // We use a shared pointer as a cancellation token here to work around the
+    // broken Windows support for cancellation. MSDN says that when you call
+    // closesocket any outstanding WSARecv or WSASend operations will complete
+    // with the error ERROR_OPERATION_ABORTED. In practice they complete with
+    // ERROR_NETNAME_DELETED, which means you can't tell the difference between
+    // a local cancellation and the socket being hard-closed by the peer.
+    shared_cancel_token_type cancel_token_;
+
+    // The protocol associated with the socket.
+    protocol_type protocol_;
+
+    // Per-descriptor data used by the reactor.
+    reactor::per_descriptor_data reactor_data_;
+
+#if defined(ASIO_ENABLE_CANCELIO)
+    // The ID of the thread from which it is safe to cancel asynchronous
+    // operations. 0 means no asynchronous operations have been started yet.
+    // ~0 means asynchronous operations have been started from more than one
+    // thread, and cancellation is not supported for the socket.
+    DWORD safe_cancellation_thread_id_;
+#endif // defined(ASIO_ENABLE_CANCELIO)
+
+    // Pointers to adjacent socket implementations in linked list.
+    implementation_type* next_;
+    implementation_type* prev_;
+  };
+
+  // Constructor.
+  win_iocp_socket_service(asio::io_service& io_service)
+    : io_service_(io_service),
+      iocp_service_(use_service<win_iocp_io_service>(io_service)),
+      reactor_(0),
+      mutex_(),
+      impl_list_(0)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    // Close all implementations, causing all operations to complete.
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    implementation_type* impl = impl_list_;
+    while (impl)
+    {
+      asio::error_code ignored_ec;
+      close_for_destruction(*impl);
+      impl = impl->next_;
+    }
+  }
+
+  // Construct a new socket implementation.
+  void construct(implementation_type& impl)
+  {
+    impl.socket_ = invalid_socket;
+    impl.flags_ = 0;
+    impl.cancel_token_.reset();
+#if defined(ASIO_ENABLE_CANCELIO)
+    impl.safe_cancellation_thread_id_ = 0;
+#endif // defined(ASIO_ENABLE_CANCELIO)
+
+    // Insert implementation into linked list of all implementations.
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    impl.next_ = impl_list_;
+    impl.prev_ = 0;
+    if (impl_list_)
+      impl_list_->prev_ = &impl;
+    impl_list_ = &impl;
+  }
+
+  // Destroy a socket implementation.
+  void destroy(implementation_type& impl)
+  {
+    close_for_destruction(impl);
+
+    // Remove implementation from linked list of all implementations.
+    asio::detail::mutex::scoped_lock lock(mutex_);
+    if (impl_list_ == &impl)
+      impl_list_ = impl.next_;
+    if (impl.prev_)
+      impl.prev_->next_ = impl.next_;
+    if (impl.next_)
+      impl.next_->prev_= impl.prev_;
+    impl.next_ = 0;
+    impl.prev_ = 0;
+  }
+
+  // Open a new socket implementation.
+  asio::error_code open(implementation_type& impl,
+      const protocol_type& protocol, asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    socket_holder sock(socket_ops::socket(protocol.family(), protocol.type(),
+          protocol.protocol(), ec));
+    if (sock.get() == invalid_socket)
+      return ec;
+
+    HANDLE sock_as_handle = reinterpret_cast<HANDLE>(sock.get());
+    if (iocp_service_.register_handle(sock_as_handle, ec))
+      return ec;
+
+    impl.socket_ = sock.release();
+    impl.flags_ = 0;
+    impl.cancel_token_.reset(static_cast<void*>(0), noop_deleter());
+    impl.protocol_ = protocol;
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Assign a native socket to a socket implementation.
+  asio::error_code assign(implementation_type& impl,
+      const protocol_type& protocol, const native_type& native_socket,
+      asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    if (iocp_service_.register_handle(native_socket.as_handle(), ec))
+      return ec;
+
+    impl.socket_ = native_socket;
+    impl.flags_ = 0;
+    impl.cancel_token_.reset(static_cast<void*>(0), noop_deleter());
+    impl.protocol_ = protocol;
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Determine whether the socket is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return impl.socket_ != invalid_socket;
+  }
+
+  // Destroy a socket implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (is_open(impl))
+    {
+      // Check if the reactor was created, in which case we need to close the
+      // socket on the reactor as well to cancel any operations that might be
+      // running there.
+      reactor* r = static_cast<reactor*>(
+            interlocked_compare_exchange_pointer(
+              reinterpret_cast<void**>(&reactor_), 0, 0));
+      if (r)
+        r->close_descriptor(impl.socket_, impl.reactor_data_);
+
+      if (socket_ops::close(impl.socket_, ec) == socket_error_retval)
+        return ec;
+
+      impl.socket_ = invalid_socket;
+      impl.flags_ = 0;
+      impl.cancel_token_.reset();
+#if defined(ASIO_ENABLE_CANCELIO)
+      impl.safe_cancellation_thread_id_ = 0;
+#endif // defined(ASIO_ENABLE_CANCELIO)
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Get the native socket representation.
+  native_type native(implementation_type& impl)
+  {
+    return impl.socket_;
+  }
+
+  // Cancel all operations associated with the socket.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+    else if (FARPROC cancel_io_ex_ptr = ::GetProcAddress(
+          ::GetModuleHandleA("KERNEL32"), "CancelIoEx"))
+    {
+      // The version of Windows supports cancellation from any thread.
+      typedef BOOL (WINAPI* cancel_io_ex_t)(HANDLE, LPOVERLAPPED);
+      cancel_io_ex_t cancel_io_ex = (cancel_io_ex_t)cancel_io_ex_ptr;
+      socket_type sock = impl.socket_;
+      HANDLE sock_as_handle = reinterpret_cast<HANDLE>(sock);
+      if (!cancel_io_ex(sock_as_handle, 0))
+      {
+        DWORD last_error = ::GetLastError();
+        if (last_error == ERROR_NOT_FOUND)
+        {
+          // ERROR_NOT_FOUND means that there were no operations to be
+          // cancelled. We swallow this error to match the behaviour on other
+          // platforms.
+          ec = asio::error_code();
+        }
+        else
+        {
+          ec = asio::error_code(last_error,
+              asio::error::get_system_category());
+        }
+      }
+      else
+      {
+        ec = asio::error_code();
+      }
+    }
+#if defined(ASIO_ENABLE_CANCELIO)
+    else if (impl.safe_cancellation_thread_id_ == 0)
+    {
+      // No operations have been started, so there's nothing to cancel.
+      ec = asio::error_code();
+    }
+    else if (impl.safe_cancellation_thread_id_ == ::GetCurrentThreadId())
+    {
+      // Asynchronous operations have been started from the current thread only,
+      // so it is safe to try to cancel them using CancelIo.
+      socket_type sock = impl.socket_;
+      HANDLE sock_as_handle = reinterpret_cast<HANDLE>(sock);
+      if (!::CancelIo(sock_as_handle))
+      {
+        DWORD last_error = ::GetLastError();
+        ec = asio::error_code(last_error,
+            asio::error::get_system_category());
+      }
+      else
+      {
+        ec = asio::error_code();
+      }
+    }
+    else
+    {
+      // Asynchronous operations have been started from more than one thread,
+      // so cancellation is not safe.
+      ec = asio::error::operation_not_supported;
+    }
+#else // defined(ASIO_ENABLE_CANCELIO)
+    else
+    {
+      // Cancellation is not supported as CancelIo may not be used.
+      ec = asio::error::operation_not_supported;
+    }
+#endif // defined(ASIO_ENABLE_CANCELIO)
+
+    return ec;
+  }
+
+  // Determine whether the socket is at the out-of-band data mark.
+  bool at_mark(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return false;
+    }
+
+    asio::detail::ioctl_arg_type value = 0;
+    socket_ops::ioctl(impl.socket_, SIOCATMARK, &value, ec);
+    return ec ? false : value != 0;
+  }
+
+  // Determine the number of bytes available for reading.
+  std::size_t available(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    asio::detail::ioctl_arg_type value = 0;
+    socket_ops::ioctl(impl.socket_, FIONREAD, &value, ec);
+    return ec ? static_cast<std::size_t>(0) : static_cast<std::size_t>(value);
+  }
+
+  // Bind the socket to the specified local endpoint.
+  asio::error_code bind(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::bind(impl.socket_, endpoint.data(), endpoint.size(), ec);
+    return ec;
+  }
+
+  // Place the socket into the state where it will listen for new connections.
+  asio::error_code listen(implementation_type& impl, int backlog,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::listen(impl.socket_, backlog, ec);
+    return ec;
+  }
+
+  // Set a socket option.
+  template <typename Option>
+  asio::error_code set_option(implementation_type& impl,
+      const Option& option, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    if (option.level(impl.protocol_) == custom_socket_option_level
+        && option.name(impl.protocol_) == enable_connection_aborted_option)
+    {
+      if (option.size(impl.protocol_) != sizeof(int))
+      {
+        ec = asio::error::invalid_argument;
+      }
+      else
+      {
+        if (*reinterpret_cast<const int*>(option.data(impl.protocol_)))
+          impl.flags_ |= implementation_type::enable_connection_aborted;
+        else
+          impl.flags_ &= ~implementation_type::enable_connection_aborted;
+        ec = asio::error_code();
+      }
+      return ec;
+    }
+    else
+    {
+      if (option.level(impl.protocol_) == SOL_SOCKET
+          && option.name(impl.protocol_) == SO_LINGER)
+      {
+        const ::linger* linger_option =
+          reinterpret_cast<const ::linger*>(option.data(impl.protocol_));
+        if (linger_option->l_onoff != 0 && linger_option->l_linger != 0)
+          impl.flags_ |= implementation_type::close_might_block;
+        else
+          impl.flags_ &= ~implementation_type::close_might_block;
+      }
+
+      socket_ops::setsockopt(impl.socket_,
+          option.level(impl.protocol_), option.name(impl.protocol_),
+          option.data(impl.protocol_), option.size(impl.protocol_), ec);
+      return ec;
+    }
+  }
+
+  // Set a socket option.
+  template <typename Option>
+  asio::error_code get_option(const implementation_type& impl,
+      Option& option, asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    if (option.level(impl.protocol_) == custom_socket_option_level
+        && option.name(impl.protocol_) == enable_connection_aborted_option)
+    {
+      if (option.size(impl.protocol_) != sizeof(int))
+      {
+        ec = asio::error::invalid_argument;
+      }
+      else
+      {
+        int* target = reinterpret_cast<int*>(option.data(impl.protocol_));
+        if (impl.flags_ & implementation_type::enable_connection_aborted)
+          *target = 1;
+        else
+          *target = 0;
+        option.resize(impl.protocol_, sizeof(int));
+        ec = asio::error_code();
+      }
+      return ec;
+    }
+    else
+    {
+      size_t size = option.size(impl.protocol_);
+      socket_ops::getsockopt(impl.socket_,
+          option.level(impl.protocol_), option.name(impl.protocol_),
+          option.data(impl.protocol_), &size, ec);
+      if (!ec)
+        option.resize(impl.protocol_, size);
+      return ec;
+    }
+  }
+
+  // Perform an IO control command on the socket.
+  template <typename IO_Control_Command>
+  asio::error_code io_control(implementation_type& impl,
+      IO_Control_Command& command, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::ioctl(impl.socket_, command.name(),
+        static_cast<ioctl_arg_type*>(command.data()), ec);
+
+    if (!ec && command.name() == static_cast<int>(FIONBIO))
+    {
+      if (*static_cast<ioctl_arg_type*>(command.data()))
+        impl.flags_ |= implementation_type::user_set_non_blocking;
+      else
+        impl.flags_ &= ~implementation_type::user_set_non_blocking;
+    }
+
+    return ec;
+  }
+
+  // Get the local endpoint.
+  endpoint_type local_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return endpoint_type();
+    }
+
+    endpoint_type endpoint;
+    std::size_t addr_len = endpoint.capacity();
+    if (socket_ops::getsockname(impl.socket_, endpoint.data(), &addr_len, ec))
+      return endpoint_type();
+    endpoint.resize(addr_len);
+    return endpoint;
+  }
+
+  // Get the remote endpoint.
+  endpoint_type remote_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return endpoint_type();
+    }
+
+    if (impl.socket_.have_remote_endpoint())
+    {
+      // Check if socket is still connected.
+      DWORD connect_time = 0;
+      size_t connect_time_len = sizeof(connect_time);
+      if (socket_ops::getsockopt(impl.socket_, SOL_SOCKET, SO_CONNECT_TIME,
+            &connect_time, &connect_time_len, ec) == socket_error_retval)
+      {
+        return endpoint_type();
+      }
+      if (connect_time == 0xFFFFFFFF)
+      {
+        ec = asio::error::not_connected;
+        return endpoint_type();
+      }
+
+      ec = asio::error_code();
+      return impl.socket_.remote_endpoint();
+    }
+    else
+    {
+      endpoint_type endpoint;
+      std::size_t addr_len = endpoint.capacity();
+      if (socket_ops::getpeername(impl.socket_, endpoint.data(), &addr_len, ec))
+        return endpoint_type();
+      endpoint.resize(addr_len);
+      return endpoint;
+    }
+  }
+
+  /// Disable sends or receives on the socket.
+  asio::error_code shutdown(implementation_type& impl,
+      socket_base::shutdown_type what, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    socket_ops::shutdown(impl.socket_, what, ec);
+    return ec;
+  }
+
+  // Send the given data to the peer. Returns the number of bytes sent.
+  template <typename ConstBufferSequence>
+  size_t send(implementation_type& impl, const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    // A request to receive 0 bytes on a stream socket is a no-op.
+    if (impl.protocol_.type() == SOCK_STREAM && bufs.all_empty())
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    // Send the data.
+    DWORD bytes_transferred = 0;
+    int result = ::WSASend(impl.socket_, bufs.buffers(),
+        bufs.count(), &bytes_transferred, flags, 0, 0);
+    if (result != 0)
+    {
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_NETNAME_DELETED)
+        last_error = WSAECONNRESET;
+      else if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return 0;
+    }
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  // Wait until data can be sent without blocking.
+  size_t send(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_write(impl.socket_, ec);
+
+    return 0;
+  }
+
+  template <typename ConstBufferSequence, typename Handler>
+  class send_op : public operation
+  {
+  public:
+    send_op(weak_cancel_token_type cancel_token,
+        const ConstBufferSequence& buffers, Handler handler)
+      : operation(&send_op::do_complete),
+        cancel_token_(cancel_token),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t bytes_transferred)
+    {
+      // Take ownership of the operation object.
+      send_op* o(static_cast<send_op*>(base));
+      typedef handler_alloc_traits<Handler, send_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        // Check whether buffers are still valid.
+        buffer_sequence_adapter<asio::const_buffer,
+            ConstBufferSequence>::validate(o->buffers_);
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+        // Map non-portable errors to their portable counterparts.
+        if (ec.value() == ERROR_NETNAME_DELETED)
+        {
+          if (o->cancel_token_.expired())
+            ec = asio::error::operation_aborted;
+          else
+            ec = asio::error::connection_reset;
+        }
+        else if (ec.value() == ERROR_PORT_UNREACHABLE)
+        {
+          ec = asio::error::connection_refused;
+        }
+
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, ec, bytes_transferred);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    weak_cancel_token_type cancel_token_;
+    ConstBufferSequence buffers_;
+    Handler handler_;
+  };
+
+  // Start an asynchronous send. The data being sent must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_send(implementation_type& impl, const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef send_op<ConstBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr,
+        impl.cancel_token_, buffers, handler);
+
+    buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    start_send_op(impl, bufs.buffers(), bufs.count(), flags,
+        impl.protocol_.type() == SOCK_STREAM && bufs.all_empty(), ptr.get());
+    ptr.release();
+  }
+
+  // Start an asynchronous wait until data can be sent without blocking.
+  template <typename Handler>
+  void async_send(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    start_reactor_op(impl, reactor::write_op, ptr.get());
+    ptr.release();
+  }
+
+  // Send a datagram to the specified endpoint. Returns the number of bytes
+  // sent.
+  template <typename ConstBufferSequence>
+  size_t send_to(implementation_type& impl, const ConstBufferSequence& buffers,
+      const endpoint_type& destination, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    // Send the data.
+    DWORD bytes_transferred = 0;
+    int result = ::WSASendTo(impl.socket_, bufs.buffers(), bufs.count(),
+        &bytes_transferred, flags, destination.data(),
+        static_cast<int>(destination.size()), 0, 0);
+    if (result != 0)
+    {
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return 0;
+    }
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  // Wait until data can be sent without blocking.
+  size_t send_to(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, const endpoint_type&,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_write(impl.socket_, ec);
+
+    return 0;
+  }
+
+  template <typename ConstBufferSequence, typename Handler>
+  class send_to_op : public operation
+  {
+  public:
+    send_to_op(weak_cancel_token_type cancel_token,
+        const ConstBufferSequence& buffers, Handler handler)
+      : operation(&send_to_op::do_complete),
+        cancel_token_(cancel_token),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t bytes_transferred)
+    {
+      // Take ownership of the operation object.
+      send_to_op* o(static_cast<send_to_op*>(base));
+      typedef handler_alloc_traits<Handler, send_to_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        // Check whether buffers are still valid.
+        buffer_sequence_adapter<asio::const_buffer,
+            ConstBufferSequence>::validate(o->buffers_);
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+        // Map non-portable errors to their portable counterparts.
+        if (ec.value() == ERROR_PORT_UNREACHABLE)
+        {
+          ec = asio::error::connection_refused;
+        }
+
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, ec, bytes_transferred);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    weak_cancel_token_type cancel_token_;
+    ConstBufferSequence buffers_;
+    Handler handler_;
+  };
+
+  // Start an asynchronous send. The data being sent must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_send_to(implementation_type& impl,
+      const ConstBufferSequence& buffers, const endpoint_type& destination,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef send_to_op<ConstBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr,
+        impl.cancel_token_, buffers, handler);
+
+    buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    start_send_to_op(impl, bufs.buffers(),
+        bufs.count(), destination, flags, ptr.get());
+    ptr.release();
+  }
+
+  // Start an asynchronous wait until data can be sent without blocking.
+  template <typename Handler>
+  void async_send_to(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, const endpoint_type&, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    start_reactor_op(impl, reactor::write_op, ptr.get());
+    ptr.release();
+  }
+
+  // Receive some data from the peer. Returns the number of bytes received.
+  template <typename MutableBufferSequence>
+  size_t receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    // A request to receive 0 bytes on a stream socket is a no-op.
+    if (impl.protocol_.type() == SOCK_STREAM && bufs.all_empty())
+    {
+      ec = asio::error_code();
+      return 0;
+    }
+
+    // Receive some data.
+    DWORD bytes_transferred = 0;
+    DWORD recv_flags = flags;
+    int result = ::WSARecv(impl.socket_, bufs.buffers(),
+        bufs.count(), &bytes_transferred, &recv_flags, 0, 0);
+    if (result != 0)
+    {
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_NETNAME_DELETED)
+        last_error = WSAECONNRESET;
+      else if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return 0;
+    }
+    if (bytes_transferred == 0 && impl.protocol_.type() == SOCK_STREAM)
+    {
+      ec = asio::error::eof;
+      return 0;
+    }
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  // Wait until data can be received without blocking.
+  size_t receive(implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_read(impl.socket_, ec);
+
+    return 0;
+  }
+
+  template <typename MutableBufferSequence, typename Handler>
+  class receive_op : public operation
+  {
+  public:
+    receive_op(int protocol_type, weak_cancel_token_type cancel_token,
+        const MutableBufferSequence& buffers, Handler handler)
+      : operation(&receive_op::do_complete),
+        protocol_type_(protocol_type),
+        cancel_token_(cancel_token),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t bytes_transferred)
+    {
+      // Take ownership of the operation object.
+      receive_op* o(static_cast<receive_op*>(base));
+      typedef handler_alloc_traits<Handler, receive_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        // Check whether buffers are still valid.
+        buffer_sequence_adapter<asio::mutable_buffer,
+            MutableBufferSequence>::validate(o->buffers_);
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+        // Map non-portable errors to their portable counterparts.
+        if (ec.value() == ERROR_NETNAME_DELETED)
+        {
+          if (o->cancel_token_.expired())
+            ec = asio::error::operation_aborted;
+          else
+            ec = asio::error::connection_reset;
+        }
+        else if (ec.value() == ERROR_PORT_UNREACHABLE)
+        {
+          ec = asio::error::connection_refused;
+        }
+
+        // Check for connection closed.
+        else if (!ec && bytes_transferred == 0
+            && o->protocol_type_ == SOCK_STREAM
+            && !buffer_sequence_adapter<asio::mutable_buffer,
+                MutableBufferSequence>::all_empty(o->buffers_)
+            && !boost::is_same<MutableBufferSequence, null_buffers>::value)
+        {
+          ec = asio::error::eof;
+        }
+
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, ec, bytes_transferred);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    int protocol_type_;
+    weak_cancel_token_type cancel_token_;
+    MutableBufferSequence buffers_;
+    Handler handler_;
+  };
+
+  // Start an asynchronous receive. The buffer for the data being received
+  // must be valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef receive_op<MutableBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    int protocol_type = impl.protocol_.type();
+    handler_ptr<alloc_traits> ptr(raw_ptr, protocol_type,
+        impl.cancel_token_, buffers, handler);
+
+    buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    start_receive_op(impl, bufs.buffers(), bufs.count(), flags,
+        protocol_type == SOCK_STREAM && bufs.all_empty(), ptr.get());
+    ptr.release();
+  }
+
+  // Wait until data can be received without blocking.
+  template <typename Handler>
+  void async_receive(implementation_type& impl, const null_buffers& buffers,
+      socket_base::message_flags flags, Handler handler)
+  {
+    if (impl.protocol_.type() == SOCK_STREAM)
+    {
+      // For stream sockets on Windows, we may issue a 0-byte overlapped
+      // WSARecv to wait until there is data available on the socket.
+
+      // Allocate and construct an operation to wrap the handler.
+      typedef receive_op<null_buffers, Handler> value_type;
+      typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+      raw_handler_ptr<alloc_traits> raw_ptr(handler);
+      int protocol_type = impl.protocol_.type();
+      handler_ptr<alloc_traits> ptr(raw_ptr, protocol_type,
+          impl.cancel_token_, buffers, handler);
+
+      ::WSABUF buf = { 0, 0 };
+      start_receive_op(impl, &buf, 1, flags, false, ptr.get());
+      ptr.release();
+    }
+    else
+    {
+      // Allocate and construct an operation to wrap the handler.
+      typedef null_buffers_op<Handler> value_type;
+      typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+      raw_handler_ptr<alloc_traits> raw_ptr(handler);
+      handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+      start_reactor_op(impl,
+          (flags & socket_base::message_out_of_band)
+            ? reactor::except_op : reactor::read_op,
+          ptr.get());
+      ptr.release();
+    }
+  }
+
+  // Receive a datagram with the endpoint of the sender. Returns the number of
+  // bytes received.
+  template <typename MutableBufferSequence>
+  size_t receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      endpoint_type& sender_endpoint, socket_base::message_flags flags,
+      asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    // Receive some data.
+    DWORD bytes_transferred = 0;
+    DWORD recv_flags = flags;
+    int endpoint_size = static_cast<int>(sender_endpoint.capacity());
+    int result = ::WSARecvFrom(impl.socket_, bufs.buffers(),
+        bufs.count(), &bytes_transferred, &recv_flags,
+        sender_endpoint.data(), &endpoint_size, 0, 0);
+    if (result != 0)
+    {
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      ec = asio::error_code(last_error,
+          asio::error::get_system_category());
+      return 0;
+    }
+    if (bytes_transferred == 0 && impl.protocol_.type() == SOCK_STREAM)
+    {
+      ec = asio::error::eof;
+      return 0;
+    }
+
+    sender_endpoint.resize(static_cast<std::size_t>(endpoint_size));
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  // Wait until data can be received without blocking.
+  size_t receive_from(implementation_type& impl,
+      const null_buffers&, endpoint_type& sender_endpoint,
+      socket_base::message_flags, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return 0;
+    }
+
+    // Wait for socket to become ready.
+    socket_ops::poll_read(impl.socket_, ec);
+
+    // Reset endpoint since it can be given no sensible value at this time.
+    sender_endpoint = endpoint_type();
+
+    return 0;
+  }
+
+  template <typename MutableBufferSequence, typename Handler>
+  class receive_from_op : public operation
+  {
+  public:
+    receive_from_op(int protocol_type, endpoint_type& endpoint,
+        const MutableBufferSequence& buffers, Handler handler)
+      : operation(&receive_from_op::do_complete),
+        protocol_type_(protocol_type),
+        endpoint_(endpoint),
+        endpoint_size_(static_cast<int>(endpoint.capacity())),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    int& endpoint_size()
+    {
+      return endpoint_size_;
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t bytes_transferred)
+    {
+      // Take ownership of the operation object.
+      receive_from_op* o(static_cast<receive_from_op*>(base));
+      typedef handler_alloc_traits<Handler, receive_from_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+        // Check whether buffers are still valid.
+        buffer_sequence_adapter<asio::mutable_buffer,
+            MutableBufferSequence>::validate(o->buffers_);
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+        // Map non-portable errors to their portable counterparts.
+        if (ec.value() == ERROR_PORT_UNREACHABLE)
+        {
+          ec = asio::error::connection_refused;
+        }
+
+        // Record the size of the endpoint returned by the operation.
+        o->endpoint_.resize(o->endpoint_size_);
+
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder2<Handler, asio::error_code, std::size_t>
+          handler(o->handler_, ec, bytes_transferred);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    int protocol_type_;
+    endpoint_type& endpoint_;
+    int endpoint_size_;
+    weak_cancel_token_type cancel_token_;
+    MutableBufferSequence buffers_;
+    Handler handler_;
+  };
+
+  // Start an asynchronous receive. The buffer for the data being received and
+  // the sender_endpoint object must both be valid for the lifetime of the
+  // asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers, endpoint_type& sender_endp,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef receive_from_op<MutableBufferSequence, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    int protocol_type = impl.protocol_.type();
+    handler_ptr<alloc_traits> ptr(raw_ptr,
+        protocol_type, sender_endp, buffers, handler);
+
+    buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    start_receive_from_op(impl, bufs.buffers(), bufs.count(),
+        sender_endp, flags, &ptr.get()->endpoint_size(), ptr.get());
+    ptr.release();
+  }
+
+  // Wait until data can be received without blocking.
+  template <typename Handler>
+  void async_receive_from(implementation_type& impl,
+      const null_buffers&, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef null_buffers_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, handler);
+
+    // Reset endpoint since it can be given no sensible value at this time.
+    sender_endpoint = endpoint_type();
+
+    start_reactor_op(impl,
+        (flags & socket_base::message_out_of_band)
+          ? reactor::except_op : reactor::read_op,
+        ptr.get());
+    ptr.release();
+  }
+
+  // Accept a new connection.
+  template <typename Socket>
+  asio::error_code accept(implementation_type& impl, Socket& peer,
+      endpoint_type* peer_endpoint, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    // We cannot accept a socket that is already open.
+    if (peer.is_open())
+    {
+      ec = asio::error::already_open;
+      return ec;
+    }
+
+    for (;;)
+    {
+      socket_holder new_socket;
+      std::size_t addr_len = 0;
+      if (peer_endpoint)
+      {
+        addr_len = peer_endpoint->capacity();
+        new_socket.reset(socket_ops::accept(impl.socket_,
+              peer_endpoint->data(), &addr_len, ec));
+      }
+      else
+      {
+        new_socket.reset(socket_ops::accept(impl.socket_, 0, 0, ec));
+      }
+
+      if (ec)
+      {
+        if (ec == asio::error::connection_aborted
+            && !(impl.flags_ & implementation_type::enable_connection_aborted))
+        {
+          // Retry accept operation.
+          continue;
+        }
+        else
+        {
+          return ec;
+        }
+      }
+
+      if (peer_endpoint)
+        peer_endpoint->resize(addr_len);
+
+      peer.assign(impl.protocol_, new_socket.get(), ec);
+      if (!ec)
+        new_socket.release();
+      return ec;
+    }
+  }
+
+  template <typename Socket, typename Handler>
+  class accept_op : public operation
+  {
+  public:
+    accept_op(win_iocp_io_service& iocp_service, socket_type socket,
+        Socket& peer, const protocol_type& protocol,
+        endpoint_type* peer_endpoint, bool enable_connection_aborted,
+        Handler handler)
+      : operation(&accept_op::do_complete),
+        iocp_service_(iocp_service),
+        socket_(socket),
+        peer_(peer),
+        protocol_(protocol),
+        peer_endpoint_(peer_endpoint),
+        enable_connection_aborted_(enable_connection_aborted),
+        handler_(handler)
+    {
+    }
+
+    socket_holder& new_socket()
+    {
+      return new_socket_;
+    }
+
+    void* output_buffer()
+    {
+      return output_buffer_;
+    }
+
+    DWORD address_length()
+    {
+      return sizeof(sockaddr_storage_type) + 16;
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code ec, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      accept_op* o(static_cast<accept_op*>(base));
+      typedef handler_alloc_traits<Handler, accept_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Map Windows error ERROR_NETNAME_DELETED to connection_aborted.
+        if (ec.value() == ERROR_NETNAME_DELETED)
+        {
+          ec = asio::error::connection_aborted;
+        }
+
+        // Restart the accept operation if we got the connection_aborted error
+        // and the enable_connection_aborted socket option is not set.
+        if (ec == asio::error::connection_aborted
+            && !o->enable_connection_aborted_)
+        {
+          // Reset OVERLAPPED structure.
+          o->reset();
+
+          // Create a new socket for the next connection, since the AcceptEx
+          // call fails with WSAEINVAL if we try to reuse the same socket.
+          o->new_socket_.reset();
+          o->new_socket_.reset(socket_ops::socket(o->protocol_.family(),
+                o->protocol_.type(), o->protocol_.protocol(), ec));
+          if (o->new_socket_.get() != invalid_socket)
+          {
+            // Accept a connection.
+            DWORD bytes_read = 0;
+            BOOL result = ::AcceptEx(o->socket_, o->new_socket_.get(),
+                o->output_buffer(), 0, o->address_length(),
+                o->address_length(), &bytes_read, o);
+            DWORD last_error = ::WSAGetLastError();
+            ec = asio::error_code(last_error,
+                asio::error::get_system_category());
+
+            // Check if the operation completed immediately.
+            if (!result && last_error != WSA_IO_PENDING)
+            {
+              if (last_error == ERROR_NETNAME_DELETED
+                  || last_error == WSAECONNABORTED)
+              {
+                // Post this handler so that operation will be restarted again.
+                o->iocp_service_.work_started();
+                o->iocp_service_.on_completion(o, ec);
+                ptr.release();
+                return;
+              }
+              else
+              {
+                // Operation already complete. Continue with rest of this
+                // handler.
+              }
+            }
+            else
+            {
+              // Asynchronous operation has been successfully restarted.
+              o->iocp_service_.work_started();
+              o->iocp_service_.on_pending(o);
+              ptr.release();
+              return;
+            }
+          }
+        }
+
+        // Get the address of the peer.
+        endpoint_type peer_endpoint;
+        if (!ec)
+        {
+          LPSOCKADDR local_addr = 0;
+          int local_addr_length = 0;
+          LPSOCKADDR remote_addr = 0;
+          int remote_addr_length = 0;
+          GetAcceptExSockaddrs(o->output_buffer(), 0, o->address_length(),
+              o->address_length(), &local_addr, &local_addr_length,
+              &remote_addr, &remote_addr_length);
+          if (static_cast<std::size_t>(remote_addr_length)
+              > peer_endpoint.capacity())
+          {
+            ec = asio::error::invalid_argument;
+          }
+          else
+          {
+            using namespace std; // For memcpy.
+            memcpy(peer_endpoint.data(), remote_addr, remote_addr_length);
+            peer_endpoint.resize(static_cast<std::size_t>(remote_addr_length));
+          }
+        }
+
+        // Need to set the SO_UPDATE_ACCEPT_CONTEXT option so that getsockname
+        // and getpeername will work on the accepted socket.
+        if (!ec)
+        {
+          SOCKET update_ctx_param = o->socket_;
+          socket_ops::setsockopt(o->new_socket_.get(),
+                SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
+                &update_ctx_param, sizeof(SOCKET), ec);
+        }
+
+        // If the socket was successfully accepted, transfer ownership of the
+        // socket to the peer object.
+        if (!ec)
+        {
+          o->peer_.assign(o->protocol_,
+              native_type(o->new_socket_.get(), peer_endpoint), ec);
+          if (!ec)
+            o->new_socket_.release();
+        }
+
+        // Pass endpoint back to caller.
+        if (o->peer_endpoint_)
+          *o->peer_endpoint_ = peer_endpoint;
+
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder1<Handler, asio::error_code>
+          handler(o->handler_, ec);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    win_iocp_io_service& iocp_service_;
+    socket_type socket_;
+    socket_holder new_socket_;
+    Socket& peer_;
+    protocol_type protocol_;
+    endpoint_type* peer_endpoint_;
+    unsigned char output_buffer_[(sizeof(sockaddr_storage_type) + 16) * 2];
+    bool enable_connection_aborted_;
+    Handler handler_;
+  };
+
+  // Start an asynchronous accept. The peer and peer_endpoint objects
+  // must be valid until the accept's handler is invoked.
+  template <typename Socket, typename Handler>
+  void async_accept(implementation_type& impl, Socket& peer,
+      endpoint_type* peer_endpoint, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef accept_op<Socket, Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    bool enable_connection_aborted =
+      (impl.flags_ & implementation_type::enable_connection_aborted);
+    handler_ptr<alloc_traits> ptr(raw_ptr, iocp_service_, impl.socket_, peer,
+        impl.protocol_, peer_endpoint, enable_connection_aborted, handler);
+
+    start_accept_op(impl, peer.is_open(), ptr.get()->new_socket(),
+        ptr.get()->output_buffer(), ptr.get()->address_length(), ptr.get());
+    ptr.release();
+  }
+
+  // Connect the socket to the specified endpoint.
+  asio::error_code connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, asio::error_code& ec)
+  {
+    if (!is_open(impl))
+    {
+      ec = asio::error::bad_descriptor;
+      return ec;
+    }
+
+    // Perform the connect operation.
+    socket_ops::connect(impl.socket_,
+        peer_endpoint.data(), peer_endpoint.size(), ec);
+    return ec;
+  }
+
+  class connect_op_base : public reactor_op
+  {
+  public:
+    connect_op_base(socket_type socket, func_type complete_func)
+      : reactor_op(&connect_op_base::do_perform, complete_func),
+        socket_(socket)
+    {
+    }
+
+    static bool do_perform(reactor_op* base)
+    {
+      connect_op_base* o(static_cast<connect_op_base*>(base));
+
+      // Get the error code from the connect operation.
+      int connect_error = 0;
+      size_t connect_error_len = sizeof(connect_error);
+      if (socket_ops::getsockopt(o->socket_, SOL_SOCKET, SO_ERROR,
+            &connect_error, &connect_error_len, o->ec_) == socket_error_retval)
+        return true;
+
+      // The connection failed so the handler will be posted with an error code.
+      if (connect_error)
+      {
+        o->ec_ = asio::error_code(connect_error,
+            asio::error::get_system_category());
+      }
+
+      return true;
+    }
+
+  private:
+    socket_type socket_;
+  };
+
+  template <typename Handler>
+  class connect_op : public connect_op_base
+  {
+  public:
+    connect_op(socket_type socket, Handler handler)
+      : connect_op_base(socket, &connect_op::do_complete),
+        handler_(handler)
+    {
+    }
+
+    static void do_complete(io_service_impl* owner, operation* base,
+        asio::error_code /*ec*/, std::size_t /*bytes_transferred*/)
+    {
+      // Take ownership of the handler object.
+      connect_op* o(static_cast<connect_op*>(base));
+      typedef handler_alloc_traits<Handler, connect_op> alloc_traits;
+      handler_ptr<alloc_traits> ptr(o->handler_, o);
+
+      // Make the upcall if required.
+      if (owner)
+      {
+        // Make a copy of the handler so that the memory can be deallocated
+        // before the upcall is made. Even if we're not about to make an
+        // upcall, a sub-object of the handler may be the true owner of the
+        // memory associated with the handler. Consequently, a local copy of
+        // the handler is required to ensure that any owning sub-object remains
+        // valid until after we have deallocated the memory here.
+        detail::binder1<Handler, asio::error_code>
+          handler(o->handler_, o->ec_);
+        ptr.reset();
+        asio::detail::fenced_block b;
+        asio_handler_invoke_helpers::invoke(handler, handler);
+      }
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Start an asynchronous connect.
+  template <typename Handler>
+  void async_connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef connect_op<Handler> value_type;
+    typedef handler_alloc_traits<Handler, value_type> alloc_traits;
+    raw_handler_ptr<alloc_traits> raw_ptr(handler);
+    handler_ptr<alloc_traits> ptr(raw_ptr, impl.socket_, handler);
+
+    start_connect_op(impl, ptr.get(), peer_endpoint);
+    ptr.release();
+  }
+
+private:
+  // Helper function to start an asynchronous send operation.
+  void start_send_op(implementation_type& impl, WSABUF* buffers,
+      std::size_t buffer_count, socket_base::message_flags flags,
+      bool noop, operation* op)
+  {
+    update_cancellation_thread_id(impl);
+    iocp_service_.work_started();
+
+    if (noop)
+      iocp_service_.on_completion(op);
+    else if (!is_open(impl))
+      iocp_service_.on_completion(op, asio::error::bad_descriptor);
+    else
+    {
+      DWORD bytes_transferred = 0;
+      int result = ::WSASend(impl.socket_, buffers,
+          buffer_count, &bytes_transferred, flags, op, 0);
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      if (result != 0 && last_error != WSA_IO_PENDING)
+        iocp_service_.on_completion(op, last_error, bytes_transferred);
+      else
+        iocp_service_.on_pending(op);
+    }
+  }
+
+  // Helper function to start an asynchronous send_to operation.
+  void start_send_to_op(implementation_type& impl, WSABUF* buffers,
+      std::size_t buffer_count, const endpoint_type& destination,
+      socket_base::message_flags flags, operation* op)
+  {
+    update_cancellation_thread_id(impl);
+    iocp_service_.work_started();
+
+    if (!is_open(impl))
+      iocp_service_.on_completion(op, asio::error::bad_descriptor);
+    else
+    {
+      DWORD bytes_transferred = 0;
+      int result = ::WSASendTo(impl.socket_, buffers, buffer_count,
+          &bytes_transferred, flags, destination.data(),
+          static_cast<int>(destination.size()), op, 0);
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      if (result != 0 && last_error != WSA_IO_PENDING)
+        iocp_service_.on_completion(op, last_error, bytes_transferred);
+      else
+        iocp_service_.on_pending(op);
+    }
+  }
+
+  // Helper function to start an asynchronous receive operation.
+  void start_receive_op(implementation_type& impl, WSABUF* buffers,
+      std::size_t buffer_count, socket_base::message_flags flags,
+      bool noop, operation* op)
+  {
+    update_cancellation_thread_id(impl);
+    iocp_service_.work_started();
+
+    if (noop)
+      iocp_service_.on_completion(op);
+    else if (!is_open(impl))
+      iocp_service_.on_completion(op, asio::error::bad_descriptor);
+    else
+    {
+      DWORD bytes_transferred = 0;
+      DWORD recv_flags = flags;
+      int result = ::WSARecv(impl.socket_, buffers, buffer_count,
+          &bytes_transferred, &recv_flags, op, 0);
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_NETNAME_DELETED)
+        last_error = WSAECONNRESET;
+      else if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      if (result != 0 && last_error != WSA_IO_PENDING)
+        iocp_service_.on_completion(op, last_error, bytes_transferred);
+      else
+        iocp_service_.on_pending(op);
+    }
+  }
+
+  // Helper function to start an asynchronous receive_from operation.
+  void start_receive_from_op(implementation_type& impl, WSABUF* buffers,
+      std::size_t buffer_count, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, int* endpoint_size, operation* op)
+  {
+    update_cancellation_thread_id(impl);
+    iocp_service_.work_started();
+
+    if (!is_open(impl))
+      iocp_service_.on_completion(op, asio::error::bad_descriptor);
+    else
+    {
+      DWORD bytes_transferred = 0;
+      DWORD recv_flags = flags;
+      int result = ::WSARecvFrom(impl.socket_, buffers,
+          buffer_count, &bytes_transferred, &recv_flags,
+          sender_endpoint.data(), endpoint_size, op, 0);
+      DWORD last_error = ::WSAGetLastError();
+      if (last_error == ERROR_PORT_UNREACHABLE)
+        last_error = WSAECONNREFUSED;
+      if (result != 0 && last_error != WSA_IO_PENDING)
+        iocp_service_.on_completion(op, last_error, bytes_transferred);
+      else
+        iocp_service_.on_pending(op);
+    }
+  }
+
+  // Helper function to start an asynchronous receive_from operation.
+  void start_accept_op(implementation_type& impl,
+      bool peer_is_open, socket_holder& new_socket,
+      void* output_buffer, DWORD address_length, operation* op)
+  {
+    update_cancellation_thread_id(impl);
+    iocp_service_.work_started();
+
+    if (!is_open(impl))
+      iocp_service_.on_completion(op, asio::error::bad_descriptor);
+    else if (peer_is_open)
+      iocp_service_.on_completion(op, asio::error::already_open);
+    else
+    {
+      asio::error_code ec;
+      new_socket.reset(socket_ops::socket(impl.protocol_.family(),
+            impl.protocol_.type(), impl.protocol_.protocol(), ec));
+      if (new_socket.get() == invalid_socket)
+        iocp_service_.on_completion(op, ec);
+      else
+      {
+        DWORD bytes_read = 0;
+        BOOL result = ::AcceptEx(impl.socket_, new_socket.get(), output_buffer,
+            0, address_length, address_length, &bytes_read, op);
+        DWORD last_error = ::WSAGetLastError();
+        if (!result && last_error != WSA_IO_PENDING)
+          iocp_service_.on_completion(op, last_error);
+        else
+          iocp_service_.on_pending(op);
+      }
+    }
+  }
+
+  // Start an asynchronous read or write operation using the the reactor.
+  void start_reactor_op(implementation_type& impl, int op_type, reactor_op* op)
+  {
+    reactor& r = get_reactor();
+    update_cancellation_thread_id(impl);
+
+    if (is_open(impl))
+    {
+      r.start_op(op_type, impl.socket_, impl.reactor_data_, op, false);
+      return;
+    }
+    else
+      op->ec_ = asio::error::bad_descriptor;
+
+    iocp_service_.post_immediate_completion(op);
+  }
+
+  // Start the asynchronous connect operation using the reactor.
+  void start_connect_op(implementation_type& impl,
+      reactor_op* op, const endpoint_type& peer_endpoint)
+  {
+    reactor& r = get_reactor();
+    update_cancellation_thread_id(impl);
+
+    if (is_open(impl))
+    {
+      ioctl_arg_type non_blocking = 1;
+      if (!socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, op->ec_))
+      {
+        if (socket_ops::connect(impl.socket_, peer_endpoint.data(),
+              peer_endpoint.size(), op->ec_) != 0)
+        {
+          if (!op->ec_
+              && !(impl.flags_ & implementation_type::user_set_non_blocking))
+          {
+            non_blocking = 0;
+            socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, op->ec_);
+          }
+
+          if (op->ec_ == asio::error::in_progress
+              || op->ec_ == asio::error::would_block)
+          {
+            op->ec_ = asio::error_code();
+            r.start_op(reactor::connect_op, impl.socket_,
+                impl.reactor_data_, op, true);
+            return;
+          }
+        }
+      }
+    }
+    else
+      op->ec_ = asio::error::bad_descriptor;
+
+    iocp_service_.post_immediate_completion(op);
+  }
+
+  // Helper function to close a socket when the associated object is being
+  // destroyed.
+  void close_for_destruction(implementation_type& impl)
+  {
+    if (is_open(impl))
+    {
+      // Check if the reactor was created, in which case we need to close the
+      // socket on the reactor as well to cancel any operations that might be
+      // running there.
+      reactor* r = static_cast<reactor*>(
+            interlocked_compare_exchange_pointer(
+              reinterpret_cast<void**>(&reactor_), 0, 0));
+      if (r)
+        r->close_descriptor(impl.socket_, impl.reactor_data_);
+
+      // The socket destructor must not block. If the user has changed the
+      // linger option to block in the foreground, we will change it back to the
+      // default so that the closure is performed in the background.
+      if (impl.flags_ & implementation_type::close_might_block)
+      {
+        ::linger opt;
+        opt.l_onoff = 0;
+        opt.l_linger = 0;
+        asio::error_code ignored_ec;
+        socket_ops::setsockopt(impl.socket_,
+            SOL_SOCKET, SO_LINGER, &opt, sizeof(opt), ignored_ec);
+      }
+
+      asio::error_code ignored_ec;
+      socket_ops::close(impl.socket_, ignored_ec);
+      impl.socket_ = invalid_socket;
+      impl.flags_ = 0;
+      impl.cancel_token_.reset();
+#if defined(ASIO_ENABLE_CANCELIO)
+      impl.safe_cancellation_thread_id_ = 0;
+#endif // defined(ASIO_ENABLE_CANCELIO)
+    }
+  }
+
+  // Update the ID of the thread from which cancellation is safe.
+  void update_cancellation_thread_id(implementation_type& impl)
+  {
+#if defined(ASIO_ENABLE_CANCELIO)
+    if (impl.safe_cancellation_thread_id_ == 0)
+      impl.safe_cancellation_thread_id_ = ::GetCurrentThreadId();
+    else if (impl.safe_cancellation_thread_id_ != ::GetCurrentThreadId())
+      impl.safe_cancellation_thread_id_ = ~DWORD(0);
+#else // defined(ASIO_ENABLE_CANCELIO)
+    (void)impl;
+#endif // defined(ASIO_ENABLE_CANCELIO)
+  }
+
+  // Helper function to get the reactor. If no reactor has been created yet, a
+  // new one is obtained from the io_service and a pointer to it is cached in
+  // this service.
+  reactor& get_reactor()
+  {
+    reactor* r = static_cast<reactor*>(
+          interlocked_compare_exchange_pointer(
+            reinterpret_cast<void**>(&reactor_), 0, 0));
+    if (!r)
+    {
+      r = &(use_service<reactor>(io_service_));
+      interlocked_exchange_pointer(reinterpret_cast<void**>(&reactor_), r);
+    }
+    return *r;
+  }
+
+  // Helper function to emulate InterlockedCompareExchangePointer functionality
+  // for:
+  // - very old Platform SDKs; and
+  // - platform SDKs where MSVC's /Wp64 option causes spurious warnings.
+  void* interlocked_compare_exchange_pointer(void** dest, void* exch, void* cmp)
+  {
+#if defined(_M_IX86)
+    return reinterpret_cast<void*>(InterlockedCompareExchange(
+          reinterpret_cast<PLONG>(dest), reinterpret_cast<LONG>(exch),
+          reinterpret_cast<LONG>(cmp)));
+#else
+    return InterlockedCompareExchangePointer(dest, exch, cmp);
+#endif
+  }
+
+  // Helper function to emulate InterlockedExchangePointer functionality for:
+  // - very old Platform SDKs; and
+  // - platform SDKs where MSVC's /Wp64 option causes spurious warnings.
+  void* interlocked_exchange_pointer(void** dest, void* val)
+  {
+#if defined(_M_IX86)
+    return reinterpret_cast<void*>(InterlockedExchange(
+          reinterpret_cast<PLONG>(dest), reinterpret_cast<LONG>(val)));
+#else
+    return InterlockedExchangePointer(dest, val);
+#endif
+  }
+
+  // The io_service used to obtain the reactor, if required.
+  asio::io_service& io_service_;
+
+  // The IOCP service used for running asynchronous operations and dispatching
+  // handlers.
+  win_iocp_io_service& iocp_service_;
+
+  // The reactor used for performing connect operations. This object is created
+  // only if needed.
+  reactor* reactor_;
+
+  // Mutex to protect access to the linked list of implementations. 
+  asio::detail::mutex mutex_;
+
+  // The head of a linked list of all implementations.
+  implementation_type* impl_list_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_HPP
diff --git a/ext/asio/detail/win_mutex.hpp b/ext/asio/detail/win_mutex.hpp
new file mode 100644
index 0000000000..1280a4e402
--- /dev/null
+++ b/ext/asio/detail/win_mutex.hpp
@@ -0,0 +1,121 @@
+//
+// win_mutex.hpp
+// ~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_MUTEX_HPP
+#define ASIO_DETAIL_WIN_MUTEX_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS)
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/scoped_lock.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class win_mutex
+  : private noncopyable
+{
+public:
+  typedef asio::detail::scoped_lock<win_mutex> scoped_lock;
+
+  // Constructor.
+  win_mutex()
+  {
+    int error = do_init();
+    if (error != 0)
+    {
+      asio::system_error e(
+          asio::error_code(error,
+            asio::error::get_system_category()),
+          "mutex");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~win_mutex()
+  {
+    ::DeleteCriticalSection(&crit_section_);
+  }
+
+  // Lock the mutex.
+  void lock()
+  {
+    ::EnterCriticalSection(&crit_section_);
+  }
+
+  // Unlock the mutex.
+  void unlock()
+  {
+    ::LeaveCriticalSection(&crit_section_);
+  }
+
+private:
+  // Initialisation must be performed in a separate function to the constructor
+  // since the compiler does not support the use of structured exceptions and
+  // C++ exceptions in the same function.
+  int do_init()
+  {
+#if defined(__MINGW32__)
+    // Not sure if MinGW supports structured exception handling, so for now
+    // we'll just call the Windows API and hope.
+# if defined(UNDER_CE)
+    ::InitializeCriticalSection(&crit_section_);
+# else
+    ::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000);
+# endif
+    return 0;
+#else
+    __try
+    {
+# if defined(UNDER_CE)
+      ::InitializeCriticalSection(&crit_section_);
+# else
+      ::InitializeCriticalSectionAndSpinCount(&crit_section_, 0x80000000);
+# endif
+    }
+    __except(GetExceptionCode() == STATUS_NO_MEMORY
+        ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
+    {
+      return ERROR_OUTOFMEMORY;
+    }
+
+    return 0;
+#endif
+  }
+
+  ::CRITICAL_SECTION crit_section_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_MUTEX_HPP
diff --git a/ext/asio/detail/win_signal_blocker.hpp b/ext/asio/detail/win_signal_blocker.hpp
new file mode 100644
index 0000000000..50d16b8a2b
--- /dev/null
+++ b/ext/asio/detail/win_signal_blocker.hpp
@@ -0,0 +1,67 @@
+//
+// win_signal_blocker.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_SIGNAL_BLOCKER_HPP
+#define ASIO_DETAIL_WIN_SIGNAL_BLOCKER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/noncopyable.hpp"
+
+namespace asio {
+namespace detail {
+
+class win_signal_blocker
+  : private noncopyable
+{
+public:
+  // Constructor blocks all signals for the calling thread.
+  win_signal_blocker()
+  {
+    // No-op.
+  }
+
+  // Destructor restores the previous signal mask.
+  ~win_signal_blocker()
+  {
+    // No-op.
+  }
+
+  // Block all signals for the calling thread.
+  void block()
+  {
+    // No-op.
+  }
+
+  // Restore the previous signal mask.
+  void unblock()
+  {
+    // No-op.
+  }
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_SIGNAL_BLOCKER_HPP
diff --git a/ext/asio/detail/win_thread.hpp b/ext/asio/detail/win_thread.hpp
new file mode 100644
index 0000000000..9bf0665c5e
--- /dev/null
+++ b/ext/asio/detail/win_thread.hpp
@@ -0,0 +1,232 @@
+//
+// win_thread.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_THREAD_HPP
+#define ASIO_DETAIL_WIN_THREAD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include <memory>
+#include <process.h>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+unsigned int __stdcall win_thread_function(void* arg);
+
+#if defined(WINVER) && (WINVER < 0x0500)
+void __stdcall apc_function(ULONG data);
+#else
+void __stdcall apc_function(ULONG_PTR data);
+#endif
+
+template <typename T>
+class win_thread_base
+{
+public:
+  static bool terminate_threads()
+  {
+    return ::InterlockedExchangeAdd(&terminate_threads_, 0) != 0;
+  }
+
+  static void set_terminate_threads(bool b)
+  {
+    ::InterlockedExchange(&terminate_threads_, b ? 1 : 0);
+  }
+
+private:
+  static long terminate_threads_;
+};
+
+template <typename T>
+long win_thread_base<T>::terminate_threads_ = 0;
+
+class win_thread
+  : private noncopyable,
+    public win_thread_base<win_thread>
+{
+public:
+  // Constructor.
+  template <typename Function>
+  win_thread(Function f)
+    : exit_event_(0)
+  {
+    std::auto_ptr<func_base> arg(new func<Function>(f));
+
+    ::HANDLE entry_event = 0;
+    arg->entry_event_ = entry_event = ::CreateEvent(0, true, false, 0);
+    if (!entry_event)
+    {
+      DWORD last_error = ::GetLastError();
+      asio::system_error e(
+          asio::error_code(last_error,
+            asio::error::get_system_category()),
+          "thread.entry_event");
+      boost::throw_exception(e);
+    }
+
+    arg->exit_event_ = exit_event_ = ::CreateEvent(0, true, false, 0);
+    if (!exit_event_)
+    {
+      DWORD last_error = ::GetLastError();
+      ::CloseHandle(entry_event);
+      asio::system_error e(
+          asio::error_code(last_error,
+            asio::error::get_system_category()),
+          "thread.exit_event");
+      boost::throw_exception(e);
+    }
+
+    unsigned int thread_id = 0;
+    thread_ = reinterpret_cast<HANDLE>(::_beginthreadex(0, 0,
+          win_thread_function, arg.get(), 0, &thread_id));
+    if (!thread_)
+    {
+      DWORD last_error = ::GetLastError();
+      if (entry_event)
+        ::CloseHandle(entry_event);
+      if (exit_event_)
+        ::CloseHandle(exit_event_);
+      asio::system_error e(
+          asio::error_code(last_error,
+            asio::error::get_system_category()),
+          "thread");
+      boost::throw_exception(e);
+    }
+    arg.release();
+
+    if (entry_event)
+    {
+      ::WaitForSingleObject(entry_event, INFINITE);
+      ::CloseHandle(entry_event);
+    }
+  }
+
+  // Destructor.
+  ~win_thread()
+  {
+    ::CloseHandle(thread_);
+
+    // The exit_event_ handle is deliberately allowed to leak here since it
+    // is an error for the owner of an internal thread not to join() it.
+  }
+
+  // Wait for the thread to exit.
+  void join()
+  {
+    ::WaitForSingleObject(exit_event_, INFINITE);
+    ::CloseHandle(exit_event_);
+    if (terminate_threads())
+    {
+      ::TerminateThread(thread_, 0);
+    }
+    else
+    {
+      ::QueueUserAPC(apc_function, thread_, 0);
+      ::WaitForSingleObject(thread_, INFINITE);
+    }
+  }
+
+private:
+  friend unsigned int __stdcall win_thread_function(void* arg);
+
+#if defined(WINVER) && (WINVER < 0x0500)
+  friend void __stdcall apc_function(ULONG);
+#else
+  friend void __stdcall apc_function(ULONG_PTR);
+#endif
+
+  class func_base
+  {
+  public:
+    virtual ~func_base() {}
+    virtual void run() = 0;
+    ::HANDLE entry_event_;
+    ::HANDLE exit_event_;
+  };
+
+  template <typename Function>
+  class func
+    : public func_base
+  {
+  public:
+    func(Function f)
+      : f_(f)
+    {
+    }
+
+    virtual void run()
+    {
+      f_();
+    }
+
+  private:
+    Function f_;
+  };
+
+  ::HANDLE thread_;
+  ::HANDLE exit_event_;
+};
+
+inline unsigned int __stdcall win_thread_function(void* arg)
+{
+  std::auto_ptr<win_thread::func_base> func(
+      static_cast<win_thread::func_base*>(arg));
+
+  ::SetEvent(func->entry_event_);
+
+  func->run();
+
+  // Signal that the thread has finished its work, but rather than returning go
+  // to sleep to put the thread into a well known state. If the thread is being
+  // joined during global object destruction then it may be killed using
+  // TerminateThread (to avoid a deadlock in DllMain). Otherwise, the SleepEx
+  // call will be interrupted using QueueUserAPC and the thread will shut down
+  // cleanly.
+  HANDLE exit_event = func->exit_event_;
+  func.reset();
+  ::SetEvent(exit_event);
+  ::SleepEx(INFINITE, TRUE);
+
+  return 0;
+}
+
+#if defined(WINVER) && (WINVER < 0x0500)
+inline void __stdcall apc_function(ULONG) {}
+#else
+inline void __stdcall apc_function(ULONG_PTR) {}
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_THREAD_HPP
diff --git a/ext/asio/detail/win_tss_ptr.hpp b/ext/asio/detail/win_tss_ptr.hpp
new file mode 100644
index 0000000000..5a4ed33cc2
--- /dev/null
+++ b/ext/asio/detail/win_tss_ptr.hpp
@@ -0,0 +1,95 @@
+//
+// win_tss_ptr.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WIN_TSS_PTR_HPP
+#define ASIO_DETAIL_WIN_TSS_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS)
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename T>
+class win_tss_ptr
+  : private noncopyable
+{
+public:
+#if defined(UNDER_CE)
+  enum { out_of_indexes = 0xFFFFFFFF };
+#else
+  enum { out_of_indexes = TLS_OUT_OF_INDEXES };
+#endif
+
+  // Constructor.
+  win_tss_ptr()
+  {
+    tss_key_ = ::TlsAlloc();
+    if (tss_key_ == out_of_indexes)
+    {
+      DWORD last_error = ::GetLastError();
+      asio::system_error e(
+          asio::error_code(last_error,
+            asio::error::get_system_category()),
+          "tss");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~win_tss_ptr()
+  {
+    ::TlsFree(tss_key_);
+  }
+
+  // Get the value.
+  operator T*() const
+  {
+    return static_cast<T*>(::TlsGetValue(tss_key_));
+  }
+
+  // Set the value.
+  void operator=(T* value)
+  {
+    ::TlsSetValue(tss_key_, value);
+  }
+
+private:
+  // Thread-specific storage to allow unlocked access to determine whether a
+  // thread is a member of the pool.
+  DWORD tss_key_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WIN_TSS_PTR_HPP
diff --git a/ext/asio/detail/wince_thread.hpp b/ext/asio/detail/wince_thread.hpp
new file mode 100644
index 0000000000..0b6de488a2
--- /dev/null
+++ b/ext/asio/detail/wince_thread.hpp
@@ -0,0 +1,124 @@
+//
+// wince_thread.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WINCE_THREAD_HPP
+#define ASIO_DETAIL_WINCE_THREAD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) && defined(UNDER_CE)
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include <memory>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace detail {
+
+DWORD WINAPI wince_thread_function(LPVOID arg);
+
+class wince_thread
+  : private noncopyable
+{
+public:
+  // Constructor.
+  template <typename Function>
+  wince_thread(Function f)
+  {
+    std::auto_ptr<func_base> arg(new func<Function>(f));
+    DWORD thread_id = 0;
+    thread_ = ::CreateThread(0, 0, wince_thread_function,
+        arg.get(), 0, &thread_id);
+    if (!thread_)
+    {
+      DWORD last_error = ::GetLastError();
+      asio::system_error e(
+          asio::error_code(last_error,
+            asio::error::get_system_category()),
+          "thread");
+      boost::throw_exception(e);
+    }
+    arg.release();
+  }
+
+  // Destructor.
+  ~wince_thread()
+  {
+    ::CloseHandle(thread_);
+  }
+
+  // Wait for the thread to exit.
+  void join()
+  {
+    ::WaitForSingleObject(thread_, INFINITE);
+  }
+
+private:
+  friend DWORD WINAPI wince_thread_function(LPVOID arg);
+
+  class func_base
+  {
+  public:
+    virtual ~func_base() {}
+    virtual void run() = 0;
+  };
+
+  template <typename Function>
+  class func
+    : public func_base
+  {
+  public:
+    func(Function f)
+      : f_(f)
+    {
+    }
+
+    virtual void run()
+    {
+      f_();
+    }
+
+  private:
+    Function f_;
+  };
+
+  ::HANDLE thread_;
+};
+
+inline DWORD WINAPI wince_thread_function(LPVOID arg)
+{
+  std::auto_ptr<wince_thread::func_base> func(
+      static_cast<wince_thread::func_base*>(arg));
+  func->run();
+  return 0;
+}
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS) && defined(UNDER_CE)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WINCE_THREAD_HPP
diff --git a/ext/asio/detail/winsock_init.hpp b/ext/asio/detail/winsock_init.hpp
new file mode 100644
index 0000000000..ae5c4bf598
--- /dev/null
+++ b/ext/asio/detail/winsock_init.hpp
@@ -0,0 +1,120 @@
+//
+// winsock_init.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WINSOCK_INIT_HPP
+#define ASIO_DETAIL_WINSOCK_INIT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/push_options.hpp"
+#include <boost/shared_ptr.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace detail {
+
+template <int Major = 2, int Minor = 0>
+class winsock_init
+  : private noncopyable
+{
+private:
+  // Structure to perform the actual initialisation.
+  struct do_init
+  {
+    do_init()
+    {
+      WSADATA wsa_data;
+      result_ = ::WSAStartup(MAKEWORD(Major, Minor), &wsa_data);
+    }
+
+    ~do_init()
+    {
+      ::WSACleanup();
+    }
+
+    int result() const
+    {
+      return result_;
+    }
+
+    // Helper function to manage a do_init singleton. The static instance of the
+    // winsock_init object ensures that this function is always called before
+    // main, and therefore before any other threads can get started. The do_init
+    // instance must be static in this function to ensure that it gets
+    // initialised before any other global objects try to use it.
+    static boost::shared_ptr<do_init> instance()
+    {
+      static boost::shared_ptr<do_init> init(new do_init);
+      return init;
+    }
+
+  private:
+    int result_;
+  };
+
+public:
+  // Constructor.
+  winsock_init()
+    : ref_(do_init::instance())
+  {
+    // Check whether winsock was successfully initialised. This check is not
+    // performed for the global instance since there will be nobody around to
+    // catch the exception.
+    if (this != &instance_ && ref_->result() != 0)
+    {
+      asio::system_error e(
+          asio::error_code(ref_->result(),
+            asio::error::get_system_category()),
+          "winsock");
+      boost::throw_exception(e);
+    }
+  }
+
+  // Destructor.
+  ~winsock_init()
+  {
+  }
+
+private:
+  // Instance to force initialisation of winsock at global scope.
+  static winsock_init instance_;
+
+  // Reference to singleton do_init object to ensure that winsock does not get
+  // cleaned up until the last user has finished with it.
+  boost::shared_ptr<do_init> ref_;
+};
+
+template <int Major, int Minor>
+winsock_init<Major, Minor> winsock_init<Major, Minor>::instance_;
+
+} // namespace detail
+} // namespace asio
+
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WINSOCK_INIT_HPP
diff --git a/ext/asio/detail/wrapped_handler.hpp b/ext/asio/detail/wrapped_handler.hpp
new file mode 100644
index 0000000000..e40a7f1585
--- /dev/null
+++ b/ext/asio/detail/wrapped_handler.hpp
@@ -0,0 +1,209 @@
+//
+// wrapped_handler.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_WRAPPED_HANDLER_HPP
+#define ASIO_DETAIL_WRAPPED_HANDLER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/type_traits/add_reference.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Dispatcher, typename Handler>
+class wrapped_handler
+{
+public:
+  typedef void result_type;
+
+  wrapped_handler(
+      typename boost::add_reference<Dispatcher>::type dispatcher,
+      Handler handler)
+    : dispatcher_(dispatcher),
+      handler_(handler)
+  {
+  }
+
+  void operator()()
+  {
+    dispatcher_.dispatch(handler_);
+  }
+
+  void operator()() const
+  {
+    dispatcher_.dispatch(handler_);
+  }
+
+  template <typename Arg1>
+  void operator()(const Arg1& arg1)
+  {
+    dispatcher_.dispatch(detail::bind_handler(handler_, arg1));
+  }
+
+  template <typename Arg1>
+  void operator()(const Arg1& arg1) const
+  {
+    dispatcher_.dispatch(detail::bind_handler(handler_, arg1));
+  }
+
+  template <typename Arg1, typename Arg2>
+  void operator()(const Arg1& arg1, const Arg2& arg2)
+  {
+    dispatcher_.dispatch(detail::bind_handler(handler_, arg1, arg2));
+  }
+
+  template <typename Arg1, typename Arg2>
+  void operator()(const Arg1& arg1, const Arg2& arg2) const
+  {
+    dispatcher_.dispatch(detail::bind_handler(handler_, arg1, arg2));
+  }
+
+  template <typename Arg1, typename Arg2, typename Arg3>
+  void operator()(const Arg1& arg1, const Arg2& arg2, const Arg3& arg3)
+  {
+    dispatcher_.dispatch(detail::bind_handler(handler_, arg1, arg2, arg3));
+  }
+
+  template <typename Arg1, typename Arg2, typename Arg3>
+  void operator()(const Arg1& arg1, const Arg2& arg2, const Arg3& arg3) const
+  {
+    dispatcher_.dispatch(detail::bind_handler(handler_, arg1, arg2, arg3));
+  }
+
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4>
+  void operator()(const Arg1& arg1, const Arg2& arg2, const Arg3& arg3,
+      const Arg4& arg4)
+  {
+    dispatcher_.dispatch(
+        detail::bind_handler(handler_, arg1, arg2, arg3, arg4));
+  }
+
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4>
+  void operator()(const Arg1& arg1, const Arg2& arg2, const Arg3& arg3,
+      const Arg4& arg4) const
+  {
+    dispatcher_.dispatch(
+        detail::bind_handler(handler_, arg1, arg2, arg3, arg4));
+  }
+
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5>
+  void operator()(const Arg1& arg1, const Arg2& arg2, const Arg3& arg3,
+      const Arg4& arg4, const Arg5& arg5)
+  {
+    dispatcher_.dispatch(
+        detail::bind_handler(handler_, arg1, arg2, arg3, arg4, arg5));
+  }
+
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5>
+  void operator()(const Arg1& arg1, const Arg2& arg2, const Arg3& arg3,
+      const Arg4& arg4, const Arg5& arg5) const
+  {
+    dispatcher_.dispatch(
+        detail::bind_handler(handler_, arg1, arg2, arg3, arg4, arg5));
+  }
+
+//private:
+  Dispatcher dispatcher_;
+  Handler handler_;
+};
+
+template <typename Handler, typename Context>
+class rewrapped_handler
+{
+public:
+  explicit rewrapped_handler(const Handler& handler, const Context& context)
+    : handler_(handler),
+      context_(context)
+  {
+  }
+
+  void operator()()
+  {
+    handler_();
+  }
+
+  void operator()() const
+  {
+    handler_();
+  }
+
+//private:
+  Handler handler_;
+  Context context_;
+};
+
+template <typename Dispatcher, typename Handler>
+inline void* asio_handler_allocate(std::size_t size,
+    wrapped_handler<Dispatcher, Handler>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+}
+
+template <typename Dispatcher, typename Handler>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    wrapped_handler<Dispatcher, Handler>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+}
+
+template <typename Function, typename Dispatcher, typename Handler>
+inline void asio_handler_invoke(const Function& function,
+    wrapped_handler<Dispatcher, Handler>* this_handler)
+{
+  this_handler->dispatcher_.dispatch(
+      rewrapped_handler<Function, Handler>(
+        function, this_handler->handler_));
+}
+
+template <typename Handler, typename Context>
+inline void* asio_handler_allocate(std::size_t size,
+    rewrapped_handler<Handler, Context>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->context_);
+}
+
+template <typename Handler, typename Context>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    rewrapped_handler<Handler, Context>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->context_);
+}
+
+template <typename Function, typename Handler, typename Context>
+inline void asio_handler_invoke(const Function& function,
+    rewrapped_handler<Handler, Context>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->context_);
+}
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WRAPPED_HANDLER_HPP
diff --git a/ext/asio/error.hpp b/ext/asio/error.hpp
new file mode 100644
index 0000000000..73caac6abd
--- /dev/null
+++ b/ext/asio/error.hpp
@@ -0,0 +1,260 @@
+//
+// error.hpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_ERROR_HPP
+#define ASIO_ERROR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cerrno>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error_code.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#if defined(GENERATING_DOCUMENTATION)
+/// INTERNAL ONLY.
+# define ASIO_NATIVE_ERROR(e) implementation_defined
+/// INTERNAL ONLY.
+# define ASIO_SOCKET_ERROR(e) implementation_defined
+/// INTERNAL ONLY.
+# define ASIO_NETDB_ERROR(e) implementation_defined
+/// INTERNAL ONLY.
+# define ASIO_GETADDRINFO_ERROR(e) implementation_defined
+/// INTERNAL ONLY.
+# define ASIO_WIN_OR_POSIX(e_win, e_posix) implementation_defined
+#elif defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# define ASIO_NATIVE_ERROR(e) e
+# define ASIO_SOCKET_ERROR(e) WSA ## e
+# define ASIO_NETDB_ERROR(e) WSA ## e
+# define ASIO_GETADDRINFO_ERROR(e) WSA ## e
+# define ASIO_WIN_OR_POSIX(e_win, e_posix) e_win
+#else
+# define ASIO_NATIVE_ERROR(e) e
+# define ASIO_SOCKET_ERROR(e) e
+# define ASIO_NETDB_ERROR(e) e
+# define ASIO_GETADDRINFO_ERROR(e) e
+# define ASIO_WIN_OR_POSIX(e_win, e_posix) e_posix
+#endif
+
+namespace asio {
+namespace error {
+
+enum basic_errors
+{
+  /// Permission denied.
+  access_denied = ASIO_SOCKET_ERROR(EACCES),
+
+  /// Address family not supported by protocol.
+  address_family_not_supported = ASIO_SOCKET_ERROR(EAFNOSUPPORT),
+
+  /// Address already in use.
+  address_in_use = ASIO_SOCKET_ERROR(EADDRINUSE),
+
+  /// Transport endpoint is already connected.
+  already_connected = ASIO_SOCKET_ERROR(EISCONN),
+
+  /// Operation already in progress.
+  already_started = ASIO_SOCKET_ERROR(EALREADY),
+
+  /// Broken pipe.
+  broken_pipe = ASIO_WIN_OR_POSIX(
+      ASIO_NATIVE_ERROR(ERROR_BROKEN_PIPE),
+      ASIO_NATIVE_ERROR(EPIPE)),
+
+  /// A connection has been aborted.
+  connection_aborted = ASIO_SOCKET_ERROR(ECONNABORTED),
+
+  /// Connection refused.
+  connection_refused = ASIO_SOCKET_ERROR(ECONNREFUSED),
+
+  /// Connection reset by peer.
+  connection_reset = ASIO_SOCKET_ERROR(ECONNRESET),
+
+  /// Bad file descriptor.
+  bad_descriptor = ASIO_SOCKET_ERROR(EBADF),
+
+  /// Bad address.
+  fault = ASIO_SOCKET_ERROR(EFAULT),
+
+  /// No route to host.
+  host_unreachable = ASIO_SOCKET_ERROR(EHOSTUNREACH),
+
+  /// Operation now in progress.
+  in_progress = ASIO_SOCKET_ERROR(EINPROGRESS),
+
+  /// Interrupted system call.
+  interrupted = ASIO_SOCKET_ERROR(EINTR),
+
+  /// Invalid argument.
+  invalid_argument = ASIO_SOCKET_ERROR(EINVAL),
+
+  /// Message too long.
+  message_size = ASIO_SOCKET_ERROR(EMSGSIZE),
+
+  /// The name was too long.
+  name_too_long = ASIO_SOCKET_ERROR(ENAMETOOLONG),
+
+  /// Network is down.
+  network_down = ASIO_SOCKET_ERROR(ENETDOWN),
+
+  /// Network dropped connection on reset.
+  network_reset = ASIO_SOCKET_ERROR(ENETRESET),
+
+  /// Network is unreachable.
+  network_unreachable = ASIO_SOCKET_ERROR(ENETUNREACH),
+
+  /// Too many open files.
+  no_descriptors = ASIO_SOCKET_ERROR(EMFILE),
+
+  /// No buffer space available.
+  no_buffer_space = ASIO_SOCKET_ERROR(ENOBUFS),
+
+  /// Cannot allocate memory.
+  no_memory = ASIO_WIN_OR_POSIX(
+      ASIO_NATIVE_ERROR(ERROR_OUTOFMEMORY),
+      ASIO_NATIVE_ERROR(ENOMEM)),
+
+  /// Operation not permitted.
+  no_permission = ASIO_WIN_OR_POSIX(
+      ASIO_NATIVE_ERROR(ERROR_ACCESS_DENIED),
+      ASIO_NATIVE_ERROR(EPERM)),
+
+  /// Protocol not available.
+  no_protocol_option = ASIO_SOCKET_ERROR(ENOPROTOOPT),
+
+  /// Transport endpoint is not connected.
+  not_connected = ASIO_SOCKET_ERROR(ENOTCONN),
+
+  /// Socket operation on non-socket.
+  not_socket = ASIO_SOCKET_ERROR(ENOTSOCK),
+
+  /// Operation cancelled.
+  operation_aborted = ASIO_WIN_OR_POSIX(
+      ASIO_NATIVE_ERROR(ERROR_OPERATION_ABORTED),
+      ASIO_NATIVE_ERROR(ECANCELED)),
+
+  /// Operation not supported.
+  operation_not_supported = ASIO_SOCKET_ERROR(EOPNOTSUPP),
+
+  /// Cannot send after transport endpoint shutdown.
+  shut_down = ASIO_SOCKET_ERROR(ESHUTDOWN),
+
+  /// Connection timed out.
+  timed_out = ASIO_SOCKET_ERROR(ETIMEDOUT),
+
+  /// Resource temporarily unavailable.
+  try_again = ASIO_WIN_OR_POSIX(
+      ASIO_NATIVE_ERROR(ERROR_RETRY),
+      ASIO_NATIVE_ERROR(EAGAIN)),
+
+  /// The socket is marked non-blocking and the requested operation would block.
+  would_block = ASIO_SOCKET_ERROR(EWOULDBLOCK)
+};
+
+enum netdb_errors
+{
+  /// Host not found (authoritative).
+  host_not_found = ASIO_NETDB_ERROR(HOST_NOT_FOUND),
+
+  /// Host not found (non-authoritative).
+  host_not_found_try_again = ASIO_NETDB_ERROR(TRY_AGAIN),
+
+  /// The query is valid but does not have associated address data.
+  no_data = ASIO_NETDB_ERROR(NO_DATA),
+
+  /// A non-recoverable error occurred.
+  no_recovery = ASIO_NETDB_ERROR(NO_RECOVERY)
+};
+
+enum addrinfo_errors
+{
+  /// The service is not supported for the given socket type.
+  service_not_found = ASIO_WIN_OR_POSIX(
+      ASIO_NATIVE_ERROR(WSATYPE_NOT_FOUND),
+      ASIO_GETADDRINFO_ERROR(EAI_SERVICE)),
+
+  /// The socket type is not supported.
+  socket_type_not_supported = ASIO_WIN_OR_POSIX(
+      ASIO_NATIVE_ERROR(WSAESOCKTNOSUPPORT),
+      ASIO_GETADDRINFO_ERROR(EAI_SOCKTYPE))
+};
+
+enum misc_errors
+{
+  /// Already open.
+  already_open = 1,
+
+  /// End of file or stream.
+  eof,
+
+  /// Element not found.
+  not_found,
+
+  /// The descriptor cannot fit into the select system call's fd_set.
+  fd_set_failure
+};
+
+enum ssl_errors
+{
+};
+
+// boostify: error category definitions go here.
+
+inline asio::error_code make_error_code(basic_errors e)
+{
+  return asio::error_code(
+      static_cast<int>(e), get_system_category());
+}
+
+inline asio::error_code make_error_code(netdb_errors e)
+{
+  return asio::error_code(
+      static_cast<int>(e), get_netdb_category());
+}
+
+inline asio::error_code make_error_code(addrinfo_errors e)
+{
+  return asio::error_code(
+      static_cast<int>(e), get_addrinfo_category());
+}
+
+inline asio::error_code make_error_code(misc_errors e)
+{
+  return asio::error_code(
+      static_cast<int>(e), get_misc_category());
+}
+
+inline asio::error_code make_error_code(ssl_errors e)
+{
+  return asio::error_code(
+      static_cast<int>(e), get_ssl_category());
+}
+
+} // namespace error
+} // namespace asio
+
+#undef ASIO_NATIVE_ERROR
+#undef ASIO_SOCKET_ERROR
+#undef ASIO_NETDB_ERROR
+#undef ASIO_GETADDRINFO_ERROR
+#undef ASIO_WIN_OR_POSIX
+
+#include "asio/impl/error_code.ipp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_ERROR_HPP
diff --git a/ext/asio/error_code.hpp b/ext/asio/error_code.hpp
new file mode 100644
index 0000000000..6657f3f2ee
--- /dev/null
+++ b/ext/asio/error_code.hpp
@@ -0,0 +1,164 @@
+//
+// error_code.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_ERROR_CODE_HPP
+#define ASIO_ERROR_CODE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#if defined(GENERATING_DOCUMENTATION)
+# define ASIO_WIN_OR_POSIX(e_win, e_posix) implementation_defined
+#elif defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# define ASIO_WIN_OR_POSIX(e_win, e_posix) e_win
+#else
+# define ASIO_WIN_OR_POSIX(e_win, e_posix) e_posix
+#endif
+
+namespace asio {
+
+namespace error
+{
+  /// Available error code categories.
+  enum error_category
+  {
+    /// System error codes.
+    system_category = ASIO_WIN_OR_POSIX(0, 0),
+
+    /// Error codes from NetDB functions.
+    netdb_category = ASIO_WIN_OR_POSIX(system_category, 1),
+
+    /// Error codes from getaddrinfo.
+    addrinfo_category = ASIO_WIN_OR_POSIX(system_category, 2),
+
+    /// Miscellaneous error codes.
+    misc_category = ASIO_WIN_OR_POSIX(3, 3),
+
+    /// SSL error codes.
+    ssl_category = ASIO_WIN_OR_POSIX(4, 4)
+  };
+
+  // Category getters.
+  inline error_category get_system_category() { return system_category; }
+  inline error_category get_netdb_category() { return netdb_category; }
+  inline error_category get_addrinfo_category() { return addrinfo_category; }
+  inline error_category get_misc_category() { return misc_category; }
+  inline error_category get_ssl_category() { return ssl_category; }
+
+} // namespace error
+
+/// Bring error category type into the asio namespace.
+typedef asio::error::error_category error_category;
+
+/// Class to represent an error code value.
+class error_code
+{
+public:
+  /// The underlying representation of an error code.
+  typedef int value_type;
+
+  /// Default constructor.
+  error_code()
+    : value_(0),
+      category_(error::system_category)
+  {
+  }
+
+  /// Construct with specific error code and category.
+  error_code(value_type v, error_category c)
+    : value_(v),
+      category_(c)
+  {
+  }
+
+  /// Construct from an error code enum.
+  template <typename ErrorEnum>
+  error_code(ErrorEnum e)
+  {
+    *this = make_error_code(e);
+  }
+
+  /// Get the error value.
+  value_type value() const
+  {
+    return value_;
+  }
+
+  /// Get the error category.
+  error_category category() const
+  {
+    return category_;
+  }
+
+  /// Get the message associated with the error.
+  std::string message() const;
+
+  struct unspecified_bool_type_t
+  {
+  };
+
+  typedef void (*unspecified_bool_type)(unspecified_bool_type_t);
+
+  static void unspecified_bool_true(unspecified_bool_type_t)
+  {
+  }
+
+  /// Operator returns non-null if there is a non-success error code.
+  operator unspecified_bool_type() const
+  {
+    if (value_ == 0)
+      return 0;
+    else
+      return &error_code::unspecified_bool_true;
+  }
+
+  /// Operator to test if the error represents success.
+  bool operator!() const
+  {
+    return value_ == 0;
+  }
+
+  /// Equality operator to compare two error objects.
+  friend bool operator==(const error_code& e1, const error_code& e2)
+  {
+    return e1.value_ == e2.value_ && e1.category_ == e2.category_;
+  }
+
+  /// Inequality operator to compare two error objects.
+  friend bool operator!=(const error_code& e1, const error_code& e2)
+  {
+    return e1.value_ != e2.value_ || e1.category_ != e2.category_;
+  }
+
+private:
+  // The value associated with the error code.
+  value_type value_;
+
+  // The category associated with the error code.
+  error_category category_;
+};
+
+} // namespace asio
+
+#undef ASIO_WIN_OR_POSIX
+
+#include "asio/error.hpp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_ERROR_CODE_HPP
diff --git a/ext/asio/handler_alloc_hook.hpp b/ext/asio/handler_alloc_hook.hpp
new file mode 100644
index 0000000000..87783cdfa5
--- /dev/null
+++ b/ext/asio/handler_alloc_hook.hpp
@@ -0,0 +1,88 @@
+//
+// handler_alloc_hook.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_HANDLER_ALLOC_HOOK_HPP
+#define ASIO_HANDLER_ALLOC_HOOK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+
+/// Default allocation function for handlers.
+/**
+ * Asynchronous operations may need to allocate temporary objects. Since
+ * asynchronous operations have a handler function object, these temporary
+ * objects can be said to be associated with the handler.
+ *
+ * Implement asio_handler_allocate and asio_handler_deallocate for your own
+ * handlers to provide custom allocation for these temporary objects.
+ *
+ * This default implementation is simply:
+ * @code
+ * return ::operator new(size);
+ * @endcode
+ *
+ * @note All temporary objects associated with a handler will be deallocated
+ * before the upcall to the handler is performed. This allows the same memory to
+ * be reused for a subsequent asynchronous operation initiated by the handler.
+ *
+ * @par Example
+ * @code
+ * class my_handler;
+ *
+ * void* asio_handler_allocate(std::size_t size, my_handler* context)
+ * {
+ *   return ::operator new(size);
+ * }
+ *
+ * void asio_handler_deallocate(void* pointer, std::size_t size,
+ *     my_handler* context)
+ * {
+ *   ::operator delete(pointer);
+ * }
+ * @endcode
+ */
+inline void* asio_handler_allocate(std::size_t size, ...)
+{
+  return ::operator new(size);
+}
+
+/// Default deallocation function for handlers.
+/**
+ * Implement asio_handler_allocate and asio_handler_deallocate for your own
+ * handlers to provide custom allocation for the associated temporary objects.
+ *
+ * This default implementation is simply:
+ * @code
+ * ::operator delete(pointer);
+ * @endcode
+ *
+ * @sa asio_handler_allocate.
+ */
+inline void asio_handler_deallocate(void* pointer, std::size_t size, ...)
+{
+  (void)(size);
+  ::operator delete(pointer);
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_HANDLER_ALLOC_HOOK_HPP
diff --git a/ext/asio/handler_invoke_hook.hpp b/ext/asio/handler_invoke_hook.hpp
new file mode 100644
index 0000000000..b3d7e45440
--- /dev/null
+++ b/ext/asio/handler_invoke_hook.hpp
@@ -0,0 +1,68 @@
+//
+// handler_invoke_hook.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_HANDLER_INVOKE_HOOK_HPP
+#define ASIO_HANDLER_INVOKE_HOOK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// Default invoke function for handlers.
+/**
+ * Completion handlers for asynchronous operations are invoked by the
+ * io_service associated with the corresponding object (e.g. a socket or
+ * deadline_timer). Certain guarantees are made on when the handler may be
+ * invoked, in particular that a handler can only be invoked from a thread that
+ * is currently calling @c run() on the corresponding io_service object.
+ * Handlers may subsequently be invoked through other objects (such as
+ * io_service::strand objects) that provide additional guarantees.
+ *
+ * When asynchronous operations are composed from other asynchronous
+ * operations, all intermediate handlers should be invoked using the same
+ * method as the final handler. This is required to ensure that user-defined
+ * objects are not accessed in a way that may violate the guarantees. This
+ * hooking function ensures that the invoked method used for the final handler
+ * is accessible at each intermediate step.
+ *
+ * Implement asio_handler_invoke for your own handlers to specify a custom
+ * invocation strategy.
+ *
+ * This default implementation is simply:
+ * @code
+ * function();
+ * @endcode
+ *
+ * @par Example
+ * @code
+ * class my_handler;
+ *
+ * template <typename Function>
+ * void asio_handler_invoke(Function function, my_handler* context)
+ * {
+ *   context->strand_.dispatch(function);
+ * }
+ * @endcode
+ */
+template <typename Function>
+inline void asio_handler_invoke(Function function, ...)
+{
+  function();
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_HANDLER_INVOKE_HOOK_HPP
diff --git a/ext/asio/impl/error_code.ipp b/ext/asio/impl/error_code.ipp
new file mode 100644
index 0000000000..614925dd41
--- /dev/null
+++ b/ext/asio/impl/error_code.ipp
@@ -0,0 +1,105 @@
+//
+// error_code.ipp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_ERROR_CODE_IPP
+#define ASIO_ERROR_CODE_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <cerrno>
+#include <cstring>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/local_free_on_block_exit.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+
+inline std::string error_code::message() const
+{
+  if (*this == error::already_open)
+    return "Already open.";
+  if (*this == error::not_found)
+    return "Not found.";
+  if (*this == error::fd_set_failure)
+    return "The descriptor does not fit into the select call's fd_set.";
+  if (category_ == error::get_ssl_category())
+    return "SSL error.";
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  value_type value = value_;
+  if (category() != error::get_system_category() && *this != error::eof)
+    return "asio error";
+  if (*this == error::eof)
+    value = ERROR_HANDLE_EOF;
+  char* msg = 0;
+  DWORD length = ::FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER
+      | FORMAT_MESSAGE_FROM_SYSTEM
+      | FORMAT_MESSAGE_IGNORE_INSERTS, 0, value,
+      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (char*)&msg, 0, 0);
+  detail::local_free_on_block_exit local_free_obj(msg);
+  if (length && msg[length - 1] == '\n')
+    msg[--length] = '\0';
+  if (length && msg[length - 1] == '\r')
+    msg[--length] = '\0';
+  if (length)
+    return msg;
+  else
+    return "asio error";
+#else // defined(BOOST_WINDOWS)
+  if (*this == error::eof)
+    return "End of file.";
+  if (*this == error::host_not_found)
+    return "Host not found (authoritative).";
+  if (*this == error::host_not_found_try_again)
+    return "Host not found (non-authoritative), try again later.";
+  if (*this == error::no_recovery)
+    return "A non-recoverable error occurred during database lookup.";
+  if (*this == error::no_data)
+    return "The query is valid, but it does not have associated data.";
+  if (*this == error::not_found)
+    return "Element not found.";
+#if !defined(__sun)
+  if (*this == error::operation_aborted)
+    return "Operation aborted.";
+#endif // !defined(__sun)
+  if (*this == error::service_not_found)
+    return "Service not found.";
+  if (*this == error::socket_type_not_supported)
+    return "Socket type not supported.";
+  if (category() != error::get_system_category())
+    return "asio error";
+#if defined(__sun) || defined(__QNX__)
+  using namespace std;
+  return strerror(value_);
+#elif defined(__MACH__) && defined(__APPLE__) \
+|| defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) \
+|| defined(_AIX) || defined(__hpux) || defined(__osf__)
+  char buf[256] = "";
+  strerror_r(value_, buf, sizeof(buf));
+  return buf;
+#else
+  char buf[256] = "";
+  return strerror_r(value_, buf, sizeof(buf));
+#endif
+#endif // defined(BOOST_WINDOWS)
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_ERROR_CODE_IPP
diff --git a/ext/asio/impl/io_service.ipp b/ext/asio/impl/io_service.ipp
new file mode 100644
index 0000000000..c3fed3b820
--- /dev/null
+++ b/ext/asio/impl/io_service.ipp
@@ -0,0 +1,224 @@
+//
+// io_service.ipp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IO_SERVICE_IPP
+#define ASIO_IO_SERVICE_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/limits.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/service_registry.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_io_service.hpp"
+#else
+# include "asio/detail/task_io_service.hpp"
+# include "asio/detail/reactor.hpp"
+#endif
+
+namespace asio {
+
+inline io_service::io_service()
+  : service_registry_(new asio::detail::service_registry(*this)),
+    impl_(service_registry_->use_service<impl_type>())
+{
+  impl_.init((std::numeric_limits<std::size_t>::max)());
+}
+
+inline io_service::io_service(std::size_t concurrency_hint)
+  : service_registry_(new asio::detail::service_registry(*this)),
+    impl_(service_registry_->use_service<impl_type>())
+{
+  impl_.init(concurrency_hint);
+}
+
+inline io_service::~io_service()
+{
+  delete service_registry_;
+}
+
+inline std::size_t io_service::run()
+{
+  asio::error_code ec;
+  std::size_t s = impl_.run(ec);
+  asio::detail::throw_error(ec);
+  return s;
+}
+
+inline std::size_t io_service::run(asio::error_code& ec)
+{
+  return impl_.run(ec);
+}
+
+inline std::size_t io_service::run_one()
+{
+  asio::error_code ec;
+  std::size_t s = impl_.run_one(ec);
+  asio::detail::throw_error(ec);
+  return s;
+}
+
+inline std::size_t io_service::run_one(asio::error_code& ec)
+{
+  return impl_.run_one(ec);
+}
+
+inline std::size_t io_service::poll()
+{
+  asio::error_code ec;
+  std::size_t s = impl_.poll(ec);
+  asio::detail::throw_error(ec);
+  return s;
+}
+
+inline std::size_t io_service::poll(asio::error_code& ec)
+{
+  return impl_.poll(ec);
+}
+
+inline std::size_t io_service::poll_one()
+{
+  asio::error_code ec;
+  std::size_t s = impl_.poll_one(ec);
+  asio::detail::throw_error(ec);
+  return s;
+}
+
+inline std::size_t io_service::poll_one(asio::error_code& ec)
+{
+  return impl_.poll_one(ec);
+}
+
+inline void io_service::stop()
+{
+  impl_.stop();
+}
+
+inline void io_service::reset()
+{
+  impl_.reset();
+}
+
+template <typename Handler>
+inline void io_service::dispatch(Handler handler)
+{
+  impl_.dispatch(handler);
+}
+
+template <typename Handler>
+inline void io_service::post(Handler handler)
+{
+  impl_.post(handler);
+}
+
+template <typename Handler>
+#if defined(GENERATING_DOCUMENTATION)
+unspecified
+#else
+inline detail::wrapped_handler<io_service&, Handler>
+#endif
+io_service::wrap(Handler handler)
+{
+  return detail::wrapped_handler<io_service&, Handler>(*this, handler);
+}
+
+inline io_service::work::work(asio::io_service& io_service)
+  : io_service_(io_service)
+{
+  io_service_.impl_.work_started();
+}
+
+inline io_service::work::work(const work& other)
+  : io_service_(other.io_service_)
+{
+  io_service_.impl_.work_started();
+}
+
+inline io_service::work::~work()
+{
+  io_service_.impl_.work_finished();
+}
+
+inline asio::io_service& io_service::work::io_service()
+{
+  return io_service_;
+}
+
+inline asio::io_service& io_service::work::get_io_service()
+{
+  return io_service_;
+}
+
+inline io_service::service::service(asio::io_service& owner)
+  : owner_(owner),
+    next_(0)
+{
+}
+
+inline io_service::service::~service()
+{
+}
+
+inline asio::io_service& io_service::service::io_service()
+{
+  return owner_;
+}
+
+inline asio::io_service& io_service::service::get_io_service()
+{
+  return owner_;
+}
+
+template <typename Service>
+inline Service& use_service(io_service& ios)
+{
+  // Check that Service meets the necessary type requirements.
+  (void)static_cast<io_service::service*>(static_cast<Service*>(0));
+  (void)static_cast<const io_service::id*>(&Service::id);
+
+  return ios.service_registry_->template use_service<Service>();
+}
+
+template <typename Service>
+void add_service(io_service& ios, Service* svc)
+{
+  // Check that Service meets the necessary type requirements.
+  (void)static_cast<io_service::service*>(static_cast<Service*>(0));
+  (void)static_cast<const io_service::id*>(&Service::id);
+
+  if (&ios != &svc->io_service())
+    boost::throw_exception(invalid_service_owner());
+  if (!ios.service_registry_->template add_service<Service>(svc))
+    boost::throw_exception(service_already_exists());
+}
+
+template <typename Service>
+bool has_service(io_service& ios)
+{
+  // Check that Service meets the necessary type requirements.
+  (void)static_cast<io_service::service*>(static_cast<Service*>(0));
+  (void)static_cast<const io_service::id*>(&Service::id);
+
+  return ios.service_registry_->template has_service<Service>();
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IO_SERVICE_IPP
diff --git a/ext/asio/impl/read.ipp b/ext/asio/impl/read.ipp
new file mode 100644
index 0000000000..85f651b850
--- /dev/null
+++ b/ext/asio/impl/read.ipp
@@ -0,0 +1,401 @@
+//
+// read.ipp
+// ~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_READ_IPP
+#define ASIO_READ_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <algorithm>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/completion_condition.hpp"
+#include "asio/error.hpp"
+#include "asio/detail/base_from_completion_cond.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/consuming_buffers.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+template <typename SyncReadStream, typename MutableBufferSequence,
+    typename CompletionCondition>
+std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  ec = asio::error_code();
+  asio::detail::consuming_buffers<
+    mutable_buffer, MutableBufferSequence> tmp(buffers);
+  std::size_t total_transferred = 0;
+  tmp.prepare(detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred)));
+  while (tmp.begin() != tmp.end())
+  {
+    std::size_t bytes_transferred = s.read_some(tmp, ec);
+    tmp.consume(bytes_transferred);
+    total_transferred += bytes_transferred;
+    tmp.prepare(detail::adapt_completion_condition_result(
+          completion_condition(ec, total_transferred)));
+  }
+  return total_transferred;
+}
+
+template <typename SyncReadStream, typename MutableBufferSequence>
+inline std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read(s, buffers, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncReadStream, typename MutableBufferSequence,
+    typename CompletionCondition>
+inline std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read(s, buffers, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+template <typename SyncReadStream, typename Allocator,
+    typename CompletionCondition>
+std::size_t read(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  ec = asio::error_code();
+  std::size_t total_transferred = 0;
+  std::size_t max_size = detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred));
+  std::size_t bytes_available = std::min<std::size_t>(512,
+      std::min<std::size_t>(max_size, b.max_size() - b.size()));
+  while (bytes_available > 0)
+  {
+    std::size_t bytes_transferred = s.read_some(b.prepare(bytes_available), ec);
+    b.commit(bytes_transferred);
+    total_transferred += bytes_transferred;
+    max_size = detail::adapt_completion_condition_result(
+          completion_condition(ec, total_transferred));
+    bytes_available = std::min<std::size_t>(512,
+        std::min<std::size_t>(max_size, b.max_size() - b.size()));
+  }
+  return total_transferred;
+}
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read(s, b, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncReadStream, typename Allocator,
+    typename CompletionCondition>
+inline std::size_t read(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read(s, b, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename MutableBufferSequence,
+      typename CompletionCondition, typename ReadHandler>
+  class read_op
+    : detail::base_from_completion_cond<CompletionCondition>
+  {
+  public:
+    read_op(AsyncReadStream& stream, const MutableBufferSequence& buffers,
+        CompletionCondition completion_condition, ReadHandler handler)
+      : detail::base_from_completion_cond<
+          CompletionCondition>(completion_condition),
+        stream_(stream),
+        buffers_(buffers),
+        total_transferred_(0),
+        handler_(handler),
+        start_(true)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      switch (start_)
+      {
+        case true: start_ = false;
+        buffers_.prepare(this->check(ec, total_transferred_));
+        for (;;)
+        {
+          stream_.async_read_some(buffers_, *this);
+          return; default:
+          total_transferred_ += bytes_transferred;
+          buffers_.consume(bytes_transferred);
+          buffers_.prepare(this->check(ec, total_transferred_));
+          if ((!ec && bytes_transferred == 0)
+              || buffers_.begin() == buffers_.end())
+            break;
+        }
+
+        handler_(ec, total_transferred_);
+      }
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    asio::detail::consuming_buffers<
+      mutable_buffer, MutableBufferSequence> buffers_;
+    std::size_t total_transferred_;
+    ReadHandler handler_;
+    bool start_;
+  };
+
+  template <typename AsyncReadStream,
+      typename CompletionCondition, typename ReadHandler>
+  class read_op<AsyncReadStream, asio::mutable_buffers_1,
+      CompletionCondition, ReadHandler>
+    : detail::base_from_completion_cond<CompletionCondition>
+  {
+  public:
+    read_op(AsyncReadStream& stream,
+        const asio::mutable_buffers_1& buffers,
+        CompletionCondition completion_condition,
+        ReadHandler handler)
+      : detail::base_from_completion_cond<
+          CompletionCondition>(completion_condition),
+        stream_(stream),
+        buffer_(buffers),
+        total_transferred_(0),
+        handler_(handler),
+        start_(true)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      std::size_t n = 0;
+      switch (start_)
+      {
+        case true: start_ = false;
+        n = this->check(ec, total_transferred_);
+        for (;;)
+        {
+          stream_.async_read_some(asio::buffer(
+                buffer_ + total_transferred_, n), *this);
+          return; default:
+          total_transferred_ += bytes_transferred;
+          if ((!ec && bytes_transferred == 0)
+              || (n = this->check(ec, total_transferred_)) == 0
+              || total_transferred_ == asio::buffer_size(buffer_))
+            break;
+        }
+
+        handler_(ec, total_transferred_);
+      }
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    asio::mutable_buffer buffer_;
+    std::size_t total_transferred_;
+    ReadHandler handler_;
+    bool start_;
+  };
+
+  template <typename AsyncReadStream, typename MutableBufferSequence,
+      typename CompletionCondition, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_op<AsyncReadStream, MutableBufferSequence,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename MutableBufferSequence,
+      typename CompletionCondition, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_op<AsyncReadStream, MutableBufferSequence,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename MutableBufferSequence, typename CompletionCondition,
+      typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_op<AsyncReadStream, MutableBufferSequence,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename MutableBufferSequence,
+    typename CompletionCondition, typename ReadHandler>
+inline void async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, ReadHandler handler)
+{
+  detail::read_op<AsyncReadStream, MutableBufferSequence,
+    CompletionCondition, ReadHandler>(
+      s, buffers, completion_condition, handler)(
+        asio::error_code(), 0);
+}
+
+template <typename AsyncReadStream, typename MutableBufferSequence,
+    typename ReadHandler>
+inline void async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
+    ReadHandler handler)
+{
+  async_read(s, buffers, transfer_all(), handler);
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename Allocator,
+      typename CompletionCondition, typename ReadHandler>
+  class read_streambuf_op
+    : detail::base_from_completion_cond<CompletionCondition>
+  {
+  public:
+    read_streambuf_op(AsyncReadStream& stream,
+        basic_streambuf<Allocator>& streambuf,
+        CompletionCondition completion_condition, ReadHandler handler)
+      : detail::base_from_completion_cond<
+          CompletionCondition>(completion_condition),
+        stream_(stream),
+        streambuf_(streambuf),
+        total_transferred_(0),
+        handler_(handler),
+        start_(true)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      std::size_t max_size, bytes_available;
+      switch (start_)
+      {
+        case true: start_ = false;
+        max_size = this->check(ec, total_transferred_);
+        bytes_available = std::min<std::size_t>(512,
+            std::min<std::size_t>(max_size,
+              streambuf_.max_size() - streambuf_.size()));
+        for (;;)
+        {
+          stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
+          return; default:
+          total_transferred_ += bytes_transferred;
+          streambuf_.commit(bytes_transferred);
+          max_size = this->check(ec, total_transferred_);
+          bytes_available = std::min<std::size_t>(512,
+              std::min<std::size_t>(max_size,
+                streambuf_.max_size() - streambuf_.size()));
+          if ((!ec && bytes_transferred == 0) || bytes_available == 0)
+            break;
+        }
+
+        handler_(ec, total_transferred_);
+      }
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    asio::basic_streambuf<Allocator>& streambuf_;
+    std::size_t total_transferred_;
+    ReadHandler handler_;
+    bool start_;
+  };
+
+  template <typename AsyncReadStream, typename Allocator,
+      typename CompletionCondition, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_streambuf_op<AsyncReadStream, Allocator,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename Allocator,
+      typename CompletionCondition, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_streambuf_op<AsyncReadStream, Allocator,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename Allocator, typename CompletionCondition, typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_streambuf_op<AsyncReadStream, Allocator,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator,
+    typename CompletionCondition, typename ReadHandler>
+inline void async_read(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, ReadHandler handler)
+{
+  detail::read_streambuf_op<AsyncReadStream,
+    Allocator, CompletionCondition, ReadHandler>(
+      s, b, completion_condition, handler)(
+        asio::error_code(), 0);
+}
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+inline void async_read(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, ReadHandler handler)
+{
+  async_read(s, b, transfer_all(), handler);
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_READ_IPP
diff --git a/ext/asio/impl/read_at.ipp b/ext/asio/impl/read_at.ipp
new file mode 100644
index 0000000000..7f35750c43
--- /dev/null
+++ b/ext/asio/impl/read_at.ipp
@@ -0,0 +1,373 @@
+//
+// read_at.ipp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_READ_AT_IPP
+#define ASIO_READ_AT_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <algorithm>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/completion_condition.hpp"
+#include "asio/error.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/consuming_buffers.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  ec = asio::error_code();
+  asio::detail::consuming_buffers<
+    mutable_buffer, MutableBufferSequence> tmp(buffers);
+  std::size_t total_transferred = 0;
+  tmp.prepare(detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred)));
+  while (tmp.begin() != tmp.end())
+  {
+    std::size_t bytes_transferred = d.read_some_at(
+        offset + total_transferred, tmp, ec);
+    tmp.consume(bytes_transferred);
+    total_transferred += bytes_transferred;
+    tmp.prepare(detail::adapt_completion_condition_result(
+          completion_condition(ec, total_transferred)));
+  }
+  return total_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_at(
+      d, offset, buffers, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename CompletionCondition>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_at(
+      d, offset, buffers, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+    typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  std::size_t total_transferred = 0;
+  for (;;)
+  {
+    std::size_t bytes_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    std::size_t bytes_transferred = d.read_some_at(
+        offset + total_transferred, b.prepare(bytes_available), ec);
+    b.commit(bytes_transferred);
+    total_transferred += bytes_transferred;
+    if (b.size() == b.max_size()
+        || completion_condition(ec, total_transferred))
+      return total_transferred;
+  }
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_at(
+      d, offset, b, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+    typename CompletionCondition>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_at(
+      d, offset, b, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncRandomAccessReadDevice,
+      typename MutableBufferSequence, typename CompletionCondition,
+      typename ReadHandler>
+  class read_at_handler
+  {
+  public:
+    typedef asio::detail::consuming_buffers<
+      mutable_buffer, MutableBufferSequence> buffers_type;
+
+    read_at_handler(AsyncRandomAccessReadDevice& stream,
+        boost::uint64_t offset, const buffers_type& buffers,
+        CompletionCondition completion_condition, ReadHandler handler)
+      : stream_(stream),
+        offset_(offset),
+        buffers_(buffers),
+        total_transferred_(0),
+        completion_condition_(completion_condition),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      total_transferred_ += bytes_transferred;
+      buffers_.consume(bytes_transferred);
+      buffers_.prepare(detail::adapt_completion_condition_result(
+            completion_condition_(ec, total_transferred_)));
+      if (buffers_.begin() == buffers_.end())
+      {
+        handler_(ec, total_transferred_);
+      }
+      else
+      {
+        stream_.async_read_some_at(
+            offset_ + total_transferred_, buffers_, *this);
+      }
+    }
+
+  //private:
+    AsyncRandomAccessReadDevice& stream_;
+    boost::uint64_t offset_;
+    buffers_type buffers_;
+    std::size_t total_transferred_;
+    CompletionCondition completion_condition_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncRandomAccessReadDevice,
+      typename MutableBufferSequence, typename CompletionCondition,
+      typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_at_handler<AsyncRandomAccessReadDevice, MutableBufferSequence,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncRandomAccessReadDevice,
+      typename MutableBufferSequence, typename CompletionCondition,
+      typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_at_handler<AsyncRandomAccessReadDevice, MutableBufferSequence,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncRandomAccessReadDevice,
+      typename MutableBufferSequence, typename CompletionCondition,
+      typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_at_handler<AsyncRandomAccessReadDevice, MutableBufferSequence,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename CompletionCondition, typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, ReadHandler handler)
+{
+  asio::detail::consuming_buffers<
+    mutable_buffer, MutableBufferSequence> tmp(buffers);
+
+  asio::error_code ec;
+  std::size_t total_transferred = 0;
+  tmp.prepare(detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred)));
+  if (tmp.begin() == tmp.end())
+  {
+    d.get_io_service().post(detail::bind_handler(
+          handler, ec, total_transferred));
+    return;
+  }
+
+  d.async_read_some_at(offset, tmp,
+      detail::read_at_handler<AsyncRandomAccessReadDevice,
+        MutableBufferSequence, CompletionCondition, ReadHandler>(
+          d, offset, tmp, completion_condition, handler));
+}
+
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers,
+    ReadHandler handler)
+{
+  async_read_at(d, offset, buffers, transfer_all(), handler);
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncRandomAccessReadDevice, typename Allocator,
+      typename CompletionCondition, typename ReadHandler>
+  class read_at_streambuf_handler
+  {
+  public:
+    read_at_streambuf_handler(AsyncRandomAccessReadDevice& stream,
+        boost::uint64_t offset, basic_streambuf<Allocator>& streambuf,
+        CompletionCondition completion_condition, ReadHandler handler)
+      : stream_(stream),
+        offset_(offset),
+        streambuf_(streambuf),
+        total_transferred_(0),
+        completion_condition_(completion_condition),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      total_transferred_ += bytes_transferred;
+      streambuf_.commit(bytes_transferred);
+      std::size_t max_size = detail::adapt_completion_condition_result(
+            completion_condition_(ec, total_transferred_));
+      std::size_t bytes_available = std::min<std::size_t>(512,
+          std::min<std::size_t>(max_size,
+            streambuf_.max_size() - streambuf_.size()));
+      if (bytes_available == 0)
+      {
+        handler_(ec, total_transferred_);
+      }
+      else
+      {
+        stream_.async_read_some_at(offset_ + total_transferred_,
+            streambuf_.prepare(bytes_available), *this);
+      }
+    }
+
+  //private:
+    AsyncRandomAccessReadDevice& stream_;
+    boost::uint64_t offset_;
+    asio::basic_streambuf<Allocator>& streambuf_;
+    std::size_t total_transferred_;
+    CompletionCondition completion_condition_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncRandomAccessReadDevice, typename Allocator,
+      typename CompletionCondition, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncRandomAccessReadDevice, typename Allocator,
+      typename CompletionCondition, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncRandomAccessReadDevice,
+      typename Allocator, typename CompletionCondition, typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+        CompletionCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+    typename CompletionCondition, typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, ReadHandler handler)
+{
+  asio::error_code ec;
+  std::size_t total_transferred = 0;
+  std::size_t max_size = detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred));
+  std::size_t bytes_available = std::min<std::size_t>(512,
+      std::min<std::size_t>(max_size, b.max_size() - b.size()));
+  if (bytes_available == 0)
+  {
+    d.get_io_service().post(detail::bind_handler(
+          handler, ec, total_transferred));
+    return;
+  }
+
+  d.async_read_some_at(offset, b.prepare(bytes_available),
+      detail::read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+        CompletionCondition, ReadHandler>(
+          d, offset, b, completion_condition, handler));
+}
+
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+    typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    ReadHandler handler)
+{
+  async_read_at(d, offset, b, transfer_all(), handler);
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_READ_AT_IPP
diff --git a/ext/asio/impl/read_until.ipp b/ext/asio/impl/read_until.ipp
new file mode 100644
index 0000000000..df5130af88
--- /dev/null
+++ b/ext/asio/impl/read_until.ipp
@@ -0,0 +1,987 @@
+//
+// read_until.ipp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_READ_UNTIL_IPP
+#define ASIO_READ_UNTIL_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <algorithm>
+#include <string>
+#include <utility>
+#include <boost/limits.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/buffers_iterator.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, char delim)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s, b, delim, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, char delim,
+    asio::error_code& ec)
+{
+  std::size_t next_search_start = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename asio::basic_streambuf<
+      Allocator>::const_buffers_type const_buffers_type;
+    typedef asio::buffers_iterator<const_buffers_type> iterator;
+    const_buffers_type buffers = b.data();
+    iterator begin = iterator::begin(buffers);
+    iterator start = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    iterator iter = std::find(start, end, delim);
+    if (iter != end)
+    {
+      // Found a match. We're done.
+      ec = asio::error_code();
+      return iter - begin + 1;
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      next_search_start = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const std::string& delim)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s, b, delim, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+namespace detail
+{
+  // Algorithm that finds a subsequence of equal values in a sequence. Returns
+  // (iterator,true) if a full match was found, in which case the iterator
+  // points to the beginning of the match. Returns (iterator,false) if a
+  // partial match was found at the end of the first sequence, in which case
+  // the iterator points to the beginning of the partial match. Returns
+  // (last1,false) if no full or partial match was found.
+  template <typename Iterator1, typename Iterator2>
+  std::pair<Iterator1, bool> partial_search(
+      Iterator1 first1, Iterator1 last1, Iterator2 first2, Iterator2 last2)
+  {
+    for (Iterator1 iter1 = first1; iter1 != last1; ++iter1)
+    {
+      Iterator1 test_iter1 = iter1;
+      Iterator2 test_iter2 = first2;
+      for (;; ++test_iter1, ++test_iter2)
+      {
+        if (test_iter2 == last2)
+          return std::make_pair(iter1, true);
+        if (test_iter1 == last1)
+        {
+          if (test_iter2 != first2)
+            return std::make_pair(iter1, false);
+          else
+            break;
+        }
+        if (*test_iter1 != *test_iter2)
+          break;
+      }
+    }
+    return std::make_pair(last1, false);
+  }
+} // namespace detail
+
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const std::string& delim,
+    asio::error_code& ec)
+{
+  std::size_t next_search_start = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename asio::basic_streambuf<
+      Allocator>::const_buffers_type const_buffers_type;
+    typedef asio::buffers_iterator<const_buffers_type> iterator;
+    const_buffers_type buffers = b.data();
+    iterator begin = iterator::begin(buffers);
+    iterator start = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    std::pair<iterator, bool> result = asio::detail::partial_search(
+        start, end, delim.begin(), delim.end());
+    if (result.first != end)
+    {
+      if (result.second)
+      {
+        // Full match. We're done.
+        ec = asio::error_code();
+        return result.first - begin + delim.length();
+      }
+      else
+      {
+        // Partial match. Next search needs to start from beginning of match.
+        next_search_start = result.first - begin;
+      }
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      next_search_start = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+template <typename SyncReadStream, typename Allocator>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s, b, expr, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
+    asio::error_code& ec)
+{
+  std::size_t next_search_start = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename asio::basic_streambuf<
+      Allocator>::const_buffers_type const_buffers_type;
+    typedef asio::buffers_iterator<const_buffers_type> iterator;
+    const_buffers_type buffers = b.data();
+    iterator begin = iterator::begin(buffers);
+    iterator start = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    boost::match_results<iterator> match_results;
+    if (boost::regex_search(start, end, match_results, expr,
+          boost::match_default | boost::match_partial))
+    {
+      if (match_results[0].matched)
+      {
+        // Full match. We're done.
+        ec = asio::error_code();
+        return match_results[0].second - begin;
+      }
+      else
+      {
+        // Partial match. Next search needs to start from beginning of match.
+        next_search_start = match_results[0].first - begin;
+      }
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      next_search_start = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+template <typename SyncReadStream, typename Allocator, typename MatchCondition>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    MatchCondition match_condition, asio::error_code& ec,
+    typename boost::enable_if<is_match_condition<MatchCondition> >::type*)
+{
+  std::size_t next_search_start = 0;
+  for (;;)
+  {
+    // Determine the range of the data to be searched.
+    typedef typename asio::basic_streambuf<
+      Allocator>::const_buffers_type const_buffers_type;
+    typedef asio::buffers_iterator<const_buffers_type> iterator;
+    const_buffers_type buffers = b.data();
+    iterator begin = iterator::begin(buffers);
+    iterator start = begin + next_search_start;
+    iterator end = iterator::end(buffers);
+
+    // Look for a match.
+    std::pair<iterator, bool> result = match_condition(start, end);
+    if (result.second)
+    {
+      // Full match. We're done.
+      ec = asio::error_code();
+      return result.first - begin;
+    }
+    else if (result.first != end)
+    {
+      // Partial match. Next search needs to start from beginning of match.
+      next_search_start = result.first - begin;
+    }
+    else
+    {
+      // No match. Next search can start with the new data.
+      next_search_start = end - begin;
+    }
+
+    // Check if buffer is full.
+    if (b.size() == b.max_size())
+    {
+      ec = error::not_found;
+      return 0;
+    }
+
+    // Need more data.
+    std::size_t bytes_available =
+      std::min<std::size_t>(512, b.max_size() - b.size());
+    b.commit(s.read_some(b.prepare(bytes_available), ec));
+    if (ec)
+      return 0;
+  }
+}
+
+template <typename SyncReadStream, typename Allocator, typename MatchCondition>
+inline std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, MatchCondition match_condition,
+    typename boost::enable_if<is_match_condition<MatchCondition> >::type*)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = read_until(s, b, match_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  class read_until_delim_handler
+  {
+  public:
+    read_until_delim_handler(AsyncReadStream& stream,
+        asio::basic_streambuf<Allocator>& streambuf, char delim,
+        std::size_t next_search_start, ReadHandler handler)
+      : stream_(stream),
+        streambuf_(streambuf),
+        delim_(delim),
+        next_search_start_(next_search_start),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      // Check for errors.
+      if (ec)
+      {
+        std::size_t bytes = 0;
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Commit received data to streambuf's get area.
+      streambuf_.commit(bytes_transferred);
+
+      // Determine the range of the data to be searched.
+      typedef typename asio::basic_streambuf<
+        Allocator>::const_buffers_type const_buffers_type;
+      typedef asio::buffers_iterator<const_buffers_type> iterator;
+      const_buffers_type buffers = streambuf_.data();
+      iterator begin = iterator::begin(buffers);
+      iterator start = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      iterator iter = std::find(start, end, delim_);
+      if (iter != end)
+      {
+        // Found a match. We're done.
+        std::size_t bytes = iter - begin + 1;
+        handler_(ec, bytes);
+        return;
+      }
+
+      // No match. Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        asio::error_code ec(error::not_found);
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Next search can start with the new data.
+      next_search_start_ = end - begin;
+
+      // Start a new asynchronous read operation to obtain more data.
+      std::size_t bytes_available =
+        std::min<std::size_t>(512, streambuf_.max_size() - streambuf_.size());
+      stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    asio::basic_streambuf<Allocator>& streambuf_;
+    char delim_;
+    std::size_t next_search_start_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_delim_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_delim_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream, typename Allocator,
+      typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_delim_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, char delim, ReadHandler handler)
+{
+  // Determine the range of the data to be searched.
+  typedef typename asio::basic_streambuf<
+    Allocator>::const_buffers_type const_buffers_type;
+  typedef asio::buffers_iterator<const_buffers_type> iterator;
+  const_buffers_type buffers = b.data();
+  iterator begin = iterator::begin(buffers);
+  iterator end = iterator::end(buffers);
+
+  // Look for a match.
+  iterator iter = std::find(begin, end, delim);
+  if (iter != end)
+  {
+    // Found a match. We're done.
+    asio::error_code ec;
+    std::size_t bytes = iter - begin + 1;
+    s.get_io_service().post(detail::bind_handler(handler, ec, bytes));
+    return;
+  }
+
+  // No match. Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    asio::error_code ec(error::not_found);
+    s.get_io_service().post(detail::bind_handler(handler, ec, 0));
+    return;
+  }
+
+  // Start a new asynchronous read operation to obtain more data.
+  std::size_t bytes_available =
+    std::min<std::size_t>(512, b.max_size() - b.size());
+  s.async_read_some(b.prepare(bytes_available),
+      detail::read_until_delim_handler<AsyncReadStream, Allocator, ReadHandler>(
+        s, b, delim, end - begin, handler));
+}
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  class read_until_delim_string_handler
+  {
+  public:
+    read_until_delim_string_handler(AsyncReadStream& stream,
+        asio::basic_streambuf<Allocator>& streambuf,
+        const std::string& delim, std::size_t next_search_start,
+        ReadHandler handler)
+      : stream_(stream),
+        streambuf_(streambuf),
+        delim_(delim),
+        next_search_start_(next_search_start),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      // Check for errors.
+      if (ec)
+      {
+        std::size_t bytes = 0;
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Commit received data to streambuf's get area.
+      streambuf_.commit(bytes_transferred);
+
+      // Determine the range of the data to be searched.
+      typedef typename asio::basic_streambuf<
+        Allocator>::const_buffers_type const_buffers_type;
+      typedef asio::buffers_iterator<const_buffers_type> iterator;
+      const_buffers_type buffers = streambuf_.data();
+      iterator begin = iterator::begin(buffers);
+      iterator start = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      std::pair<iterator, bool> result = asio::detail::partial_search(
+          start, end, delim_.begin(), delim_.end());
+      if (result.first != end)
+      {
+        if (result.second)
+        {
+          // Full match. We're done.
+          std::size_t bytes = result.first - begin + delim_.length();
+          handler_(ec, bytes);
+          return;
+        }
+        else
+        {
+          // Partial match. Next search needs to start from beginning of match.
+          next_search_start_ = result.first - begin;
+        }
+      }
+      else
+      {
+        // No match. Next search can start with the new data.
+        next_search_start_ = end - begin;
+      }
+
+      // Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        asio::error_code ec2(error::not_found);
+        handler_(ec2, bytes);
+        return;
+      }
+
+      // Start a new asynchronous read operation to obtain more data.
+      std::size_t bytes_available =
+        std::min<std::size_t>(512, streambuf_.max_size() - streambuf_.size());
+      stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    asio::basic_streambuf<Allocator>& streambuf_;
+    std::string delim_;
+    std::size_t next_search_start_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_delim_string_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_delim_string_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream,
+      typename Allocator, typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_delim_string_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const std::string& delim,
+    ReadHandler handler)
+{
+  // Determine the range of the data to be searched.
+  typedef typename asio::basic_streambuf<
+    Allocator>::const_buffers_type const_buffers_type;
+  typedef asio::buffers_iterator<const_buffers_type> iterator;
+  const_buffers_type buffers = b.data();
+  iterator begin = iterator::begin(buffers);
+  iterator end = iterator::end(buffers);
+
+  // Look for a match.
+  std::size_t next_search_start;
+  std::pair<iterator, bool> result = asio::detail::partial_search(
+      begin, end, delim.begin(), delim.end());
+  if (result.first != end)
+  {
+    if (result.second)
+    {
+      // Full match. We're done.
+      asio::error_code ec;
+      std::size_t bytes = result.first - begin + delim.length();
+      s.get_io_service().post(detail::bind_handler(handler, ec, bytes));
+      return;
+    }
+    else
+    {
+      // Partial match. Next search needs to start from beginning of match.
+      next_search_start = result.first - begin;
+    }
+  }
+  else
+  {
+    // No match. Next search can start with the new data.
+    next_search_start = end - begin;
+  }
+
+  // Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    asio::error_code ec(error::not_found);
+    s.get_io_service().post(detail::bind_handler(handler, ec, 0));
+    return;
+  }
+
+  // Start a new asynchronous read operation to obtain more data.
+  std::size_t bytes_available =
+    std::min<std::size_t>(512, b.max_size() - b.size());
+  s.async_read_some(b.prepare(bytes_available),
+      detail::read_until_delim_string_handler<
+        AsyncReadStream, Allocator, ReadHandler>(
+          s, b, delim, next_search_start, handler));
+}
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  class read_until_expr_handler
+  {
+  public:
+    read_until_expr_handler(AsyncReadStream& stream,
+        asio::basic_streambuf<Allocator>& streambuf,
+        const boost::regex& expr, std::size_t next_search_start,
+        ReadHandler handler)
+      : stream_(stream),
+        streambuf_(streambuf),
+        expr_(expr),
+        next_search_start_(next_search_start),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      // Check for errors.
+      if (ec)
+      {
+        std::size_t bytes = 0;
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Commit received data to streambuf's get area.
+      streambuf_.commit(bytes_transferred);
+
+      // Determine the range of the data to be searched.
+      typedef typename asio::basic_streambuf<
+        Allocator>::const_buffers_type const_buffers_type;
+      typedef asio::buffers_iterator<const_buffers_type> iterator;
+      const_buffers_type buffers = streambuf_.data();
+      iterator begin = iterator::begin(buffers);
+      iterator start = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      boost::match_results<iterator> match_results;
+      if (boost::regex_search(start, end, match_results, expr_,
+            boost::match_default | boost::match_partial))
+      {
+        if (match_results[0].matched)
+        {
+          // Full match. We're done.
+          std::size_t bytes = match_results[0].second - begin;
+          handler_(ec, bytes);
+          return;
+        }
+        else
+        {
+          // Partial match. Next search needs to start from beginning of match.
+          next_search_start_ = match_results[0].first - begin;
+        }
+      }
+      else
+      {
+        // No match. Next search can start with the new data.
+        next_search_start_ = end - begin;
+      }
+
+      // Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        asio::error_code ec(error::not_found);
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Start a new asynchronous read operation to obtain more data.
+      std::size_t bytes_available =
+        std::min<std::size_t>(512, streambuf_.max_size() - streambuf_.size());
+      stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    asio::basic_streambuf<Allocator>& streambuf_;
+    boost::regex expr_;
+    std::size_t next_search_start_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_expr_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_expr_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream, typename Allocator,
+      typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_expr_handler<AsyncReadStream,
+        Allocator, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
+    ReadHandler handler)
+{
+  // Determine the range of the data to be searched.
+  typedef typename asio::basic_streambuf<
+    Allocator>::const_buffers_type const_buffers_type;
+  typedef asio::buffers_iterator<const_buffers_type> iterator;
+  const_buffers_type buffers = b.data();
+  iterator begin = iterator::begin(buffers);
+  iterator end = iterator::end(buffers);
+
+  // Look for a match.
+  std::size_t next_search_start;
+  boost::match_results<iterator> match_results;
+  if (boost::regex_search(begin, end, match_results, expr,
+        boost::match_default | boost::match_partial))
+  {
+    if (match_results[0].matched)
+    {
+      // Full match. We're done.
+      asio::error_code ec;
+      std::size_t bytes = match_results[0].second - begin;
+      s.get_io_service().post(detail::bind_handler(handler, ec, bytes));
+      return;
+    }
+    else
+    {
+      // Partial match. Next search needs to start from beginning of match.
+      next_search_start = match_results[0].first - begin;
+    }
+  }
+  else
+  {
+    // No match. Next search can start with the new data.
+    next_search_start = end - begin;
+  }
+
+  // Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    asio::error_code ec(error::not_found);
+    s.get_io_service().post(detail::bind_handler(handler, ec, 0));
+    return;
+  }
+
+  // Start a new asynchronous read operation to obtain more data.
+  std::size_t bytes_available =
+    std::min<std::size_t>(512, b.max_size() - b.size());
+  s.async_read_some(b.prepare(bytes_available),
+      detail::read_until_expr_handler<AsyncReadStream, Allocator, ReadHandler>(
+        s, b, expr, next_search_start, handler));
+}
+
+namespace detail
+{
+  template <typename AsyncReadStream, typename Allocator,
+      typename MatchCondition, typename ReadHandler>
+  class read_until_match_handler
+  {
+  public:
+    read_until_match_handler(AsyncReadStream& stream,
+        asio::basic_streambuf<Allocator>& streambuf,
+        MatchCondition match_condition, std::size_t next_search_start,
+        ReadHandler handler)
+      : stream_(stream),
+        streambuf_(streambuf),
+        match_condition_(match_condition),
+        next_search_start_(next_search_start),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      // Check for errors.
+      if (ec)
+      {
+        std::size_t bytes = 0;
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Commit received data to streambuf's get area.
+      streambuf_.commit(bytes_transferred);
+
+      // Determine the range of the data to be searched.
+      typedef typename asio::basic_streambuf<
+        Allocator>::const_buffers_type const_buffers_type;
+      typedef asio::buffers_iterator<const_buffers_type> iterator;
+      const_buffers_type buffers = streambuf_.data();
+      iterator begin = iterator::begin(buffers);
+      iterator start = begin + next_search_start_;
+      iterator end = iterator::end(buffers);
+
+      // Look for a match.
+      std::pair<iterator, bool> result = match_condition_(start, end);
+      if (result.second)
+      {
+        // Full match. We're done.
+        std::size_t bytes = result.first - begin;
+        handler_(ec, bytes);
+        return;
+      }
+      else if (result.first != end)
+      {
+        // Partial match. Next search needs to start from beginning of match.
+        next_search_start_ = result.first - begin;
+      }
+      else
+      {
+        // No match. Next search can start with the new data.
+        next_search_start_ = end - begin;
+      }
+
+      // Check if buffer is full.
+      if (streambuf_.size() == streambuf_.max_size())
+      {
+        std::size_t bytes = 0;
+        asio::error_code ec(error::not_found);
+        handler_(ec, bytes);
+        return;
+      }
+
+      // Start a new asynchronous read operation to obtain more data.
+      std::size_t bytes_available =
+        std::min<std::size_t>(512, streambuf_.max_size() - streambuf_.size());
+      stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
+    }
+
+  //private:
+    AsyncReadStream& stream_;
+    asio::basic_streambuf<Allocator>& streambuf_;
+    MatchCondition match_condition_;
+    std::size_t next_search_start_;
+    ReadHandler handler_;
+  };
+
+  template <typename AsyncReadStream, typename Allocator,
+      typename MatchCondition, typename ReadHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      read_until_match_handler<AsyncReadStream,
+        Allocator, MatchCondition, ReadHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncReadStream, typename Allocator,
+      typename MatchCondition, typename ReadHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      read_until_match_handler<AsyncReadStream,
+        Allocator, MatchCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncReadStream, typename Allocator,
+      typename MatchCondition, typename ReadHandler>
+  inline void asio_handler_invoke(const Function& function,
+      read_until_match_handler<AsyncReadStream,
+        Allocator, MatchCondition, ReadHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncReadStream, typename Allocator,
+    typename MatchCondition, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    MatchCondition match_condition, ReadHandler handler,
+    typename boost::enable_if<is_match_condition<MatchCondition> >::type*)
+{
+  // Determine the range of the data to be searched.
+  typedef typename asio::basic_streambuf<
+    Allocator>::const_buffers_type const_buffers_type;
+  typedef asio::buffers_iterator<const_buffers_type> iterator;
+  const_buffers_type buffers = b.data();
+  iterator begin = iterator::begin(buffers);
+  iterator end = iterator::end(buffers);
+
+  // Look for a match.
+  std::size_t next_search_start;
+  std::pair<iterator, bool> result = match_condition(begin, end);
+  if (result.second)
+  {
+    // Full match. We're done.
+    asio::error_code ec;
+    std::size_t bytes = result.first - begin;
+    s.get_io_service().post(detail::bind_handler(handler, ec, bytes));
+    return;
+  }
+  else if (result.first != end)
+  {
+    // Partial match. Next search needs to start from beginning of match.
+    next_search_start = result.first - begin;
+  }
+  else
+  {
+    // No match. Next search can start with the new data.
+    next_search_start = end - begin;
+  }
+
+  // Check if buffer is full.
+  if (b.size() == b.max_size())
+  {
+    asio::error_code ec(error::not_found);
+    s.get_io_service().post(detail::bind_handler(handler, ec, 0));
+    return;
+  }
+
+  // Start a new asynchronous read operation to obtain more data.
+  std::size_t bytes_available =
+    std::min<std::size_t>(512, b.max_size() - b.size());
+  s.async_read_some(b.prepare(bytes_available),
+      detail::read_until_match_handler<
+        AsyncReadStream, Allocator, MatchCondition, ReadHandler>(
+          s, b, match_condition, next_search_start, handler));
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_READ_UNTIL_IPP
diff --git a/ext/asio/impl/serial_port_base.ipp b/ext/asio/impl/serial_port_base.ipp
new file mode 100644
index 0000000000..64ab6a45a0
--- /dev/null
+++ b/ext/asio/impl/serial_port_base.ipp
@@ -0,0 +1,557 @@
+//
+// serial_port_base.ipp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SERIAL_PORT_BASE_IPP
+#define ASIO_SERIAL_PORT_BASE_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+
+inline serial_port_base::baud_rate::baud_rate(unsigned int rate)
+  : value_(rate)
+{
+}
+
+inline unsigned int serial_port_base::baud_rate::value() const
+{
+  return value_;
+}
+
+inline asio::error_code serial_port_base::baud_rate::store(
+    ASIO_OPTION_STORAGE& storage, asio::error_code& ec) const
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  storage.BaudRate = value_;
+#else
+  speed_t baud;
+  switch (value_)
+  {
+  // Do POSIX-specified rates first.
+  case 0: baud = B0; break;
+  case 50: baud = B50; break;
+  case 75: baud = B75; break;
+  case 110: baud = B110; break;
+  case 134: baud = B134; break;
+  case 150: baud = B150; break;
+  case 200: baud = B200; break;
+  case 300: baud = B300; break;
+  case 600: baud = B600; break;
+  case 1200: baud = B1200; break;
+  case 1800: baud = B1800; break;
+  case 2400: baud = B2400; break;
+  case 4800: baud = B4800; break;
+  case 9600: baud = B9600; break;
+  case 19200: baud = B19200; break;
+  case 38400: baud = B38400; break;
+  // And now the extended ones conditionally.
+# ifdef B7200
+  case 7200: baud = B7200; break;
+# endif
+# ifdef B14400
+  case 14400: baud = B14400; break;
+# endif
+# ifdef B57600
+  case 57600: baud = B57600; break;
+# endif
+# ifdef B115200
+  case 115200: baud = B115200; break;
+# endif
+# ifdef B230400
+  case 230400: baud = B230400; break;
+# endif
+# ifdef B460800
+  case 460800: baud = B460800; break;
+# endif
+# ifdef B500000
+  case 500000: baud = B500000; break;
+# endif
+# ifdef B576000
+  case 576000: baud = B576000; break;
+# endif
+# ifdef B921600
+  case 921600: baud = B921600; break;
+# endif
+# ifdef B1000000
+  case 1000000: baud = B1000000; break;
+# endif
+# ifdef B1152000
+  case 1152000: baud = B1152000; break;
+# endif
+# ifdef B2000000
+  case 2000000: baud = B2000000; break;
+# endif
+# ifdef B3000000
+  case 3000000: baud = B3000000; break;
+# endif
+# ifdef B3500000
+  case 3500000: baud = B3500000; break;
+# endif
+# ifdef B4000000
+  case 4000000: baud = B4000000; break;
+# endif
+  default:
+    baud = B0;
+    ec = asio::error::invalid_argument;
+    return ec;
+  }
+# if defined(_BSD_SOURCE)
+  ::cfsetspeed(&storage, baud);
+# else
+  ::cfsetispeed(&storage, baud);
+  ::cfsetospeed(&storage, baud);
+# endif
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline asio::error_code serial_port_base::baud_rate::load(
+    const ASIO_OPTION_STORAGE& storage, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  value_ = storage.BaudRate;
+#else
+  speed_t baud = ::cfgetospeed(&storage);
+  switch (baud)
+  {
+  // First do those specified by POSIX.
+  case B0: value_ = 0; break;
+  case B50: value_ = 50; break;
+  case B75: value_ = 75; break;
+  case B110: value_ = 110; break;
+  case B134: value_ = 134; break;
+  case B150: value_ = 150; break;
+  case B200: value_ = 200; break;
+  case B300: value_ = 300; break;
+  case B600: value_ = 600; break;
+  case B1200: value_ = 1200; break;
+  case B1800: value_ = 1800; break;
+  case B2400: value_ = 2400; break;
+  case B4800: value_ = 4800; break;
+  case B9600: value_ = 9600; break;
+  case B19200: value_ = 19200; break;
+  case B38400: value_ = 38400; break;
+  // Now conditionally handle a bunch of extended rates.
+# ifdef B7200
+  case B7200: value_ = 7200; break;
+# endif
+# ifdef B14400
+  case B14400: value_ = 14400; break;
+# endif
+# ifdef B57600
+  case B57600: value_ = 57600; break;
+# endif
+# ifdef B115200
+  case B115200: value_ = 115200; break;
+# endif
+# ifdef B230400
+  case B230400: value_ = 230400; break;
+# endif
+# ifdef B460800
+  case B460800: value_ = 460800; break;
+# endif
+# ifdef B500000
+  case B500000: value_ = 500000; break;
+# endif
+# ifdef B576000
+  case B576000: value_ = 576000; break;
+# endif
+# ifdef B921600
+  case B921600: value_ = 921600; break;
+# endif
+# ifdef B1000000
+  case B1000000: value_ = 1000000; break;
+# endif
+# ifdef B1152000
+  case B1152000: value_ = 1152000; break;
+# endif
+# ifdef B2000000
+  case B2000000: value_ = 2000000; break;
+# endif
+# ifdef B3000000
+  case B3000000: value_ = 3000000; break;
+# endif
+# ifdef B3500000
+  case B3500000: value_ = 3500000; break;
+# endif
+# ifdef B4000000
+  case B4000000: value_ = 4000000; break;
+# endif
+  default:
+    value_ = 0;
+    ec = asio::error::invalid_argument;
+    return ec;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline serial_port_base::flow_control::flow_control(
+    serial_port_base::flow_control::type t)
+  : value_(t)
+{
+  if (t != none && t != software && t != hardware)
+  {
+    std::out_of_range ex("invalid flow_control value");
+    boost::throw_exception(ex);
+  }
+}
+
+inline serial_port_base::flow_control::type
+serial_port_base::flow_control::value() const
+{
+  return value_;
+}
+
+inline asio::error_code serial_port_base::flow_control::store(
+    ASIO_OPTION_STORAGE& storage, asio::error_code& ec) const
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  storage.fOutxCtsFlow = FALSE;
+  storage.fOutxDsrFlow = FALSE;
+  storage.fTXContinueOnXoff = TRUE;
+  storage.fDtrControl = DTR_CONTROL_ENABLE;
+  storage.fDsrSensitivity = FALSE;
+  storage.fOutX = FALSE;
+  storage.fInX = FALSE;
+  storage.fRtsControl = RTS_CONTROL_ENABLE;
+  switch (value_)
+  {
+  case none:
+    break;
+  case software:
+    storage.fOutX = TRUE;
+    storage.fInX = TRUE;
+    break;
+  case hardware:
+    storage.fOutxCtsFlow = TRUE;
+    storage.fRtsControl = RTS_CONTROL_HANDSHAKE;
+    break;
+  default:
+    break;
+  }
+#else
+  switch (value_)
+  {
+  case none:
+    storage.c_iflag &= ~(IXOFF | IXON);
+# if defined(_BSD_SOURCE)
+    storage.c_cflag &= ~CRTSCTS;
+# endif
+    break;
+  case software:
+    storage.c_iflag |= IXOFF | IXON;
+# if defined(_BSD_SOURCE)
+    storage.c_cflag &= ~CRTSCTS;
+# endif
+    break;
+  case hardware:
+# if defined(_BSD_SOURCE)
+    storage.c_iflag &= ~(IXOFF | IXON);
+    storage.c_cflag |= CRTSCTS;
+    break;
+# else
+    ec = asio::error::operation_not_supported;
+    return ec;
+# endif
+  default:
+    break;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline asio::error_code serial_port_base::flow_control::load(
+    const ASIO_OPTION_STORAGE& storage, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  if (storage.fOutX && storage.fInX)
+  {
+    value_ = software;
+  }
+  else if (storage.fOutxCtsFlow && storage.fRtsControl == RTS_CONTROL_HANDSHAKE)
+  {
+    value_ = hardware;
+  }
+  else
+  {
+    value_ = none;
+  }
+#else
+  if (storage.c_iflag & (IXOFF | IXON))
+  {
+    value_ = software;
+  }
+# if defined(_BSD_SOURCE)
+  else if (storage.c_cflag & CRTSCTS)
+  {
+    value_ = hardware;
+  }
+# endif
+  else
+  {
+    value_ = none;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline serial_port_base::parity::parity(serial_port_base::parity::type t)
+  : value_(t)
+{
+  if (t != none && t != odd && t != even)
+  {
+    std::out_of_range ex("invalid parity value");
+    boost::throw_exception(ex);
+  }
+}
+
+inline serial_port_base::parity::type serial_port_base::parity::value() const
+{
+  return value_;
+}
+
+inline asio::error_code serial_port_base::parity::store(
+    ASIO_OPTION_STORAGE& storage, asio::error_code& ec) const
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  switch (value_)
+  {
+  case none:
+    storage.fParity = FALSE;
+    storage.Parity = NOPARITY;
+    break;
+  case odd:
+    storage.fParity = TRUE;
+    storage.Parity = ODDPARITY;
+    break;
+  case even:
+    storage.fParity = TRUE;
+    storage.Parity = EVENPARITY;
+    break;
+  default:
+    break;
+  }
+#else
+  switch (value_)
+  {
+  case none:
+    storage.c_iflag |= IGNPAR;
+    storage.c_cflag &= ~(PARENB | PARODD);
+    break;
+  case even:
+    storage.c_iflag &= ~(IGNPAR | PARMRK);
+    storage.c_iflag |= INPCK;
+    storage.c_cflag |= PARENB;
+    storage.c_cflag &= ~PARODD;
+    break;
+  case odd:
+    storage.c_iflag &= ~(IGNPAR | PARMRK);
+    storage.c_iflag |= INPCK;
+    storage.c_cflag |= (PARENB | PARODD);
+    break;
+  default:
+    break;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline asio::error_code serial_port_base::parity::load(
+    const ASIO_OPTION_STORAGE& storage, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  if (storage.Parity == EVENPARITY)
+  {
+    value_ = even;
+  }
+  else if (storage.Parity == ODDPARITY)
+  {
+    value_ = odd;
+  }
+  else
+  {
+    value_ = none;
+  }
+#else
+  if (storage.c_cflag & PARENB)
+  {
+    if (storage.c_cflag & PARODD)
+    {
+      value_ = odd;
+    }
+    else
+    {
+      value_ = even;
+    }
+  }
+  else
+  {
+    value_ = none;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline serial_port_base::stop_bits::stop_bits(
+    serial_port_base::stop_bits::type t)
+  : value_(t)
+{
+  if (t != one && t != onepointfive && t != two)
+  {
+    std::out_of_range ex("invalid stop_bits value");
+    boost::throw_exception(ex);
+  }
+}
+
+inline serial_port_base::stop_bits::type
+serial_port_base::stop_bits::value() const
+{
+  return value_;
+}
+
+inline asio::error_code serial_port_base::stop_bits::store(
+    ASIO_OPTION_STORAGE& storage, asio::error_code& ec) const
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  switch (value_)
+  {
+  case one:
+    storage.StopBits = ONESTOPBIT;
+    break;
+  case onepointfive:
+    storage.StopBits = ONE5STOPBITS;
+    break;
+  case two:
+    storage.StopBits = TWOSTOPBITS;
+    break;
+  default:
+    break;
+  }
+#else
+  switch (value_)
+  {
+  case one:
+    storage.c_cflag &= ~CSTOPB;
+    break;
+  case two:
+    storage.c_cflag |= CSTOPB;
+    break;
+  default:
+    ec = asio::error::operation_not_supported;
+    return ec;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline asio::error_code serial_port_base::stop_bits::load(
+    const ASIO_OPTION_STORAGE& storage, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  if (storage.StopBits == ONESTOPBIT)
+  {
+    value_ = one;
+  }
+  else if (storage.StopBits == ONE5STOPBITS)
+  {
+    value_ = onepointfive;
+  }
+  else if (storage.StopBits == TWOSTOPBITS)
+  {
+    value_ = two;
+  }
+  else
+  {
+    value_ = one;
+  }
+#else
+  value_ = (storage.c_cflag & CSTOPB) ? two : one;
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline serial_port_base::character_size::character_size(unsigned int t)
+  : value_(t)
+{
+  if (t < 5 || t > 8)
+  {
+    std::out_of_range ex("invalid character_size value");
+    boost::throw_exception(ex);
+  }
+}
+
+inline unsigned int serial_port_base::character_size::value() const
+{
+  return value_;
+}
+
+inline asio::error_code serial_port_base::character_size::store(
+    ASIO_OPTION_STORAGE& storage, asio::error_code& ec) const
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  storage.ByteSize = value_;
+#else
+  storage.c_cflag &= ~CSIZE;
+  switch (value_)
+  {
+  case 5: storage.c_cflag |= CS5; break;
+  case 6: storage.c_cflag |= CS6; break;
+  case 7: storage.c_cflag |= CS7; break;
+  case 8: storage.c_cflag |= CS8; break;
+  default: break;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+inline asio::error_code serial_port_base::character_size::load(
+    const ASIO_OPTION_STORAGE& storage, asio::error_code& ec)
+{
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  value_ = storage.ByteSize;
+#else
+  if ((storage.c_cflag & CSIZE) == CS5) { value_ = 5; }
+  else if ((storage.c_cflag & CSIZE) == CS6) { value_ = 6; }
+  else if ((storage.c_cflag & CSIZE) == CS7) { value_ = 7; }
+  else if ((storage.c_cflag & CSIZE) == CS8) { value_ = 8; }
+  else
+  {
+    // Hmmm, use 8 for now.
+    value_ = 8;
+  }
+#endif
+  ec = asio::error_code();
+  return ec;
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SERIAL_PORT_BASE_IPP
diff --git a/ext/asio/impl/write.ipp b/ext/asio/impl/write.ipp
new file mode 100644
index 0000000000..82e7a3ebb3
--- /dev/null
+++ b/ext/asio/impl/write.ipp
@@ -0,0 +1,402 @@
+//
+// write.ipp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WRITE_IPP
+#define ASIO_WRITE_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/completion_condition.hpp"
+#include "asio/detail/base_from_completion_cond.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/consuming_buffers.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+template <typename SyncWriteStream, typename ConstBufferSequence,
+    typename CompletionCondition>
+std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  ec = asio::error_code();
+  asio::detail::consuming_buffers<
+    const_buffer, ConstBufferSequence> tmp(buffers);
+  std::size_t total_transferred = 0;
+  tmp.prepare(detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred)));
+  while (tmp.begin() != tmp.end())
+  {
+    std::size_t bytes_transferred = s.write_some(tmp, ec);
+    tmp.consume(bytes_transferred);
+    total_transferred += bytes_transferred;
+    tmp.prepare(detail::adapt_completion_condition_result(
+          completion_condition(ec, total_transferred)));
+  }
+  return total_transferred;
+}
+
+template <typename SyncWriteStream, typename ConstBufferSequence>
+inline std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write(s, buffers, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncWriteStream, typename ConstBufferSequence,
+    typename CompletionCondition>
+inline std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write(s, buffers, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+template <typename SyncWriteStream, typename Allocator,
+    typename CompletionCondition>
+std::size_t write(SyncWriteStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  std::size_t bytes_transferred = write(s, b.data(), completion_condition, ec);
+  b.consume(bytes_transferred);
+  return bytes_transferred;
+}
+
+template <typename SyncWriteStream, typename Allocator>
+inline std::size_t write(SyncWriteStream& s,
+    asio::basic_streambuf<Allocator>& b)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write(s, b, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncWriteStream, typename Allocator,
+    typename CompletionCondition>
+inline std::size_t write(SyncWriteStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write(s, b, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncWriteStream, typename ConstBufferSequence,
+      typename CompletionCondition, typename WriteHandler>
+  class write_op
+    : detail::base_from_completion_cond<CompletionCondition>
+  {
+  public:
+    write_op(AsyncWriteStream& stream, const ConstBufferSequence& buffers,
+        CompletionCondition completion_condition, WriteHandler handler)
+      : detail::base_from_completion_cond<
+          CompletionCondition>(completion_condition),
+        stream_(stream),
+        buffers_(buffers),
+        total_transferred_(0),
+        handler_(handler),
+        start_(true)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      switch (start_)
+      {
+        case true: start_ = false;
+        buffers_.prepare(this->check(ec, total_transferred_));
+        for (;;)
+        {
+          stream_.async_write_some(buffers_, *this);
+          return; default:
+          total_transferred_ += bytes_transferred;
+          buffers_.consume(bytes_transferred);
+          buffers_.prepare(this->check(ec, total_transferred_));
+          if ((!ec && bytes_transferred == 0)
+              || buffers_.begin() == buffers_.end())
+            break;
+        }
+
+        handler_(ec, total_transferred_);
+      }
+    }
+
+  //private:
+    AsyncWriteStream& stream_;
+    asio::detail::consuming_buffers<
+      const_buffer, ConstBufferSequence> buffers_;
+    std::size_t total_transferred_;
+    WriteHandler handler_;
+    bool start_;
+  };
+
+  template <typename AsyncWriteStream,
+      typename CompletionCondition, typename WriteHandler>
+  class write_op<AsyncWriteStream, asio::mutable_buffers_1,
+      CompletionCondition, WriteHandler>
+    : detail::base_from_completion_cond<CompletionCondition>
+  {
+  public:
+    write_op(AsyncWriteStream& stream,
+        const asio::mutable_buffers_1& buffers,
+        CompletionCondition completion_condition,
+        WriteHandler handler)
+      : detail::base_from_completion_cond<
+          CompletionCondition>(completion_condition),
+        stream_(stream),
+        buffer_(buffers),
+        total_transferred_(0),
+        handler_(handler),
+        start_(true)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      std::size_t n = 0;
+      switch (start_)
+      {
+        case true: start_ = false;
+        n = this->check(ec, total_transferred_);
+        for (;;)
+        {
+          stream_.async_write_some(asio::buffer(
+                buffer_ + total_transferred_, n), *this);
+          return; default:
+          total_transferred_ += bytes_transferred;
+          if ((!ec && bytes_transferred == 0)
+              || (n = this->check(ec, total_transferred_)) == 0
+              || total_transferred_ == asio::buffer_size(buffer_))
+            break;
+        }
+
+        handler_(ec, total_transferred_);
+      }
+    }
+
+  //private:
+    AsyncWriteStream& stream_;
+    asio::mutable_buffer buffer_;
+    std::size_t total_transferred_;
+    WriteHandler handler_;
+    bool start_;
+  };
+
+  template <typename AsyncWriteStream,
+      typename CompletionCondition, typename WriteHandler>
+  class write_op<AsyncWriteStream, asio::const_buffers_1,
+      CompletionCondition, WriteHandler>
+    : detail::base_from_completion_cond<CompletionCondition>
+  {
+  public:
+    write_op(AsyncWriteStream& stream,
+        const asio::const_buffers_1& buffers,
+        CompletionCondition completion_condition,
+        WriteHandler handler)
+      : detail::base_from_completion_cond<
+          CompletionCondition>(completion_condition),
+        stream_(stream),
+        buffer_(buffers),
+        total_transferred_(0),
+        handler_(handler),
+        start_(true)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      std::size_t n = 0;
+      switch (start_)
+      {
+        case true: start_ = false;
+        n = this->check(ec, total_transferred_);
+        for (;;)
+        {
+          stream_.async_write_some(asio::buffer(
+                buffer_ + total_transferred_, n), *this);
+          return; default:
+          total_transferred_ += bytes_transferred;
+          if ((!ec && bytes_transferred == 0)
+              || (n = this->check(ec, total_transferred_)) == 0
+              || total_transferred_ == asio::buffer_size(buffer_))
+            break;
+        }
+
+        handler_(ec, total_transferred_);
+      }
+    }
+
+  //private:
+    AsyncWriteStream& stream_;
+    asio::const_buffer buffer_;
+    std::size_t total_transferred_;
+    WriteHandler handler_;
+    bool start_;
+  };
+
+  template <typename AsyncWriteStream, typename ConstBufferSequence,
+      typename CompletionCondition, typename WriteHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      write_op<AsyncWriteStream, ConstBufferSequence,
+        CompletionCondition, WriteHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncWriteStream, typename ConstBufferSequence,
+      typename CompletionCondition, typename WriteHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      write_op<AsyncWriteStream, ConstBufferSequence,
+        CompletionCondition, WriteHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncWriteStream,
+      typename ConstBufferSequence, typename CompletionCondition,
+      typename WriteHandler>
+  inline void asio_handler_invoke(const Function& function,
+      write_op<AsyncWriteStream, ConstBufferSequence,
+        CompletionCondition, WriteHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncWriteStream, typename ConstBufferSequence,
+  typename CompletionCondition, typename WriteHandler>
+inline void async_write(AsyncWriteStream& s, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, WriteHandler handler)
+{
+  detail::write_op<AsyncWriteStream, ConstBufferSequence,
+    CompletionCondition, WriteHandler>(
+      s, buffers, completion_condition, handler)(
+        asio::error_code(), 0);
+}
+
+template <typename AsyncWriteStream, typename ConstBufferSequence,
+    typename WriteHandler>
+inline void async_write(AsyncWriteStream& s, const ConstBufferSequence& buffers,
+    WriteHandler handler)
+{
+  async_write(s, buffers, transfer_all(), handler);
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncWriteStream, typename Allocator,
+      typename WriteHandler>
+  class write_streambuf_handler
+  {
+  public:
+    write_streambuf_handler(asio::basic_streambuf<Allocator>& streambuf,
+        WriteHandler handler)
+      : streambuf_(streambuf),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      streambuf_.consume(bytes_transferred);
+      handler_(ec, bytes_transferred);
+    }
+
+  //private:
+    asio::basic_streambuf<Allocator>& streambuf_;
+    WriteHandler handler_;
+  };
+
+  template <typename AsyncWriteStream, typename Allocator,
+      typename WriteHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      write_streambuf_handler<AsyncWriteStream,
+        Allocator, WriteHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncWriteStream, typename Allocator,
+      typename WriteHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      write_streambuf_handler<AsyncWriteStream,
+        Allocator, WriteHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncWriteStream, typename Allocator,
+      typename WriteHandler>
+  inline void asio_handler_invoke(const Function& function,
+      write_streambuf_handler<AsyncWriteStream,
+        Allocator, WriteHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncWriteStream, typename Allocator,
+    typename CompletionCondition, typename WriteHandler>
+inline void async_write(AsyncWriteStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, WriteHandler handler)
+{
+  async_write(s, b.data(), completion_condition,
+      detail::write_streambuf_handler<
+        AsyncWriteStream, Allocator, WriteHandler>(b, handler));
+}
+
+template <typename AsyncWriteStream, typename Allocator, typename WriteHandler>
+inline void async_write(AsyncWriteStream& s,
+    asio::basic_streambuf<Allocator>& b, WriteHandler handler)
+{
+  async_write(s, b, transfer_all(), handler);
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WRITE_IPP
diff --git a/ext/asio/impl/write_at.ipp b/ext/asio/impl/write_at.ipp
new file mode 100644
index 0000000000..12fb3f458d
--- /dev/null
+++ b/ext/asio/impl/write_at.ipp
@@ -0,0 +1,319 @@
+//
+// write_at.ipp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WRITE_AT_IPP
+#define ASIO_WRITE_AT_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/completion_condition.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/consuming_buffers.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+
+template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename CompletionCondition>
+std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  ec = asio::error_code();
+  asio::detail::consuming_buffers<
+    const_buffer, ConstBufferSequence> tmp(buffers);
+  std::size_t total_transferred = 0;
+  tmp.prepare(detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred)));
+  while (tmp.begin() != tmp.end())
+  {
+    std::size_t bytes_transferred = d.write_some_at(
+        offset + total_transferred, tmp, ec);
+    tmp.consume(bytes_transferred);
+    total_transferred += bytes_transferred;
+    tmp.prepare(detail::adapt_completion_condition_result(
+          completion_condition(ec, total_transferred)));
+  }
+  return total_transferred;
+}
+
+template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence>
+inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write_at(
+      d, offset, buffers, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename CompletionCondition>
+inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write_at(
+      d, offset, buffers, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+template <typename SyncRandomAccessWriteDevice, typename Allocator,
+    typename CompletionCondition>
+std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, asio::error_code& ec)
+{
+  std::size_t bytes_transferred = write_at(
+      d, offset, b.data(), completion_condition, ec);
+  b.consume(bytes_transferred);
+  return bytes_transferred;
+}
+
+template <typename SyncRandomAccessWriteDevice, typename Allocator>
+inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write_at(d, offset, b, transfer_all(), ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+template <typename SyncRandomAccessWriteDevice, typename Allocator,
+    typename CompletionCondition>
+inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition)
+{
+  asio::error_code ec;
+  std::size_t bytes_transferred = write_at(
+      d, offset, b, completion_condition, ec);
+  asio::detail::throw_error(ec);
+  return bytes_transferred;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
+      typename CompletionCondition, typename WriteHandler>
+  class write_at_handler
+  {
+  public:
+    typedef asio::detail::consuming_buffers<
+      const_buffer, ConstBufferSequence> buffers_type;
+
+    write_at_handler(AsyncRandomAccessWriteDevice& stream,
+        boost::uint64_t offset, const buffers_type& buffers,
+        CompletionCondition completion_condition, WriteHandler handler)
+      : stream_(stream),
+        buffers_(buffers),
+        offset_(offset),
+        total_transferred_(0),
+        completion_condition_(completion_condition),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      total_transferred_ += bytes_transferred;
+      buffers_.consume(bytes_transferred);
+      buffers_.prepare(detail::adapt_completion_condition_result(
+            completion_condition_(ec, total_transferred_)));
+      if (buffers_.begin() == buffers_.end())
+      {
+        handler_(ec, total_transferred_);
+      }
+      else
+      {
+        stream_.async_write_some_at(
+            offset_ + total_transferred_, buffers_, *this);
+      }
+    }
+
+  //private:
+    AsyncRandomAccessWriteDevice& stream_;
+    buffers_type buffers_;
+    boost::uint64_t offset_;
+    std::size_t total_transferred_;
+    CompletionCondition completion_condition_;
+    WriteHandler handler_;
+  };
+
+  template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
+      typename CompletionCondition, typename WriteHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      write_at_handler<AsyncRandomAccessWriteDevice, ConstBufferSequence,
+        CompletionCondition, WriteHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
+      typename CompletionCondition, typename WriteHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      write_at_handler<AsyncRandomAccessWriteDevice, ConstBufferSequence,
+        CompletionCondition, WriteHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncRandomAccessWriteDevice,
+      typename ConstBufferSequence, typename CompletionCondition,
+      typename WriteHandler>
+  inline void asio_handler_invoke(const Function& function,
+      write_at_handler<AsyncRandomAccessWriteDevice, ConstBufferSequence,
+        CompletionCondition, WriteHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename CompletionCondition, typename WriteHandler>
+inline void async_write_at(AsyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, WriteHandler handler)
+{
+  asio::detail::consuming_buffers<
+    const_buffer, ConstBufferSequence> tmp(buffers);
+
+  asio::error_code ec;
+  std::size_t total_transferred = 0;
+  tmp.prepare(detail::adapt_completion_condition_result(
+        completion_condition(ec, total_transferred)));
+  if (tmp.begin() == tmp.end())
+  {
+    d.get_io_service().post(detail::bind_handler(
+          handler, ec, total_transferred));
+    return;
+  }
+
+  d.async_write_some_at(offset, tmp,
+      detail::write_at_handler<AsyncRandomAccessWriteDevice,
+      ConstBufferSequence, CompletionCondition, WriteHandler>(
+          d, offset, tmp, completion_condition, handler));
+}
+
+template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename WriteHandler>
+inline void async_write_at(AsyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers,
+    WriteHandler handler)
+{
+  async_write_at(d, offset, buffers, transfer_all(), handler);
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+  template <typename AsyncRandomAccessWriteDevice, typename Allocator,
+      typename WriteHandler>
+  class write_at_streambuf_handler
+  {
+  public:
+    write_at_streambuf_handler(
+        asio::basic_streambuf<Allocator>& streambuf,
+        WriteHandler handler)
+      : streambuf_(streambuf),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const asio::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      streambuf_.consume(bytes_transferred);
+      handler_(ec, bytes_transferred);
+    }
+
+  //private:
+    asio::basic_streambuf<Allocator>& streambuf_;
+    WriteHandler handler_;
+  };
+
+  template <typename AsyncRandomAccessWriteDevice, typename Allocator,
+      typename WriteHandler>
+  inline void* asio_handler_allocate(std::size_t size,
+      write_at_streambuf_handler<AsyncRandomAccessWriteDevice,
+        Allocator, WriteHandler>* this_handler)
+  {
+    return asio_handler_alloc_helpers::allocate(
+        size, this_handler->handler_);
+  }
+
+  template <typename AsyncRandomAccessWriteDevice, typename Allocator,
+      typename WriteHandler>
+  inline void asio_handler_deallocate(void* pointer, std::size_t size,
+      write_at_streambuf_handler<AsyncRandomAccessWriteDevice,
+        Allocator, WriteHandler>* this_handler)
+  {
+    asio_handler_alloc_helpers::deallocate(
+        pointer, size, this_handler->handler_);
+  }
+
+  template <typename Function, typename AsyncRandomAccessWriteDevice,
+      typename Allocator, typename WriteHandler>
+  inline void asio_handler_invoke(const Function& function,
+      write_at_streambuf_handler<AsyncRandomAccessWriteDevice,
+        Allocator, WriteHandler>* this_handler)
+  {
+    asio_handler_invoke_helpers::invoke(
+        function, this_handler->handler_);
+  }
+} // namespace detail
+
+template <typename AsyncRandomAccessWriteDevice, typename Allocator,
+    typename CompletionCondition, typename WriteHandler>
+inline void async_write_at(AsyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, WriteHandler handler)
+{
+  async_write_at(d, offset, b.data(), completion_condition,
+      detail::write_at_streambuf_handler<
+        AsyncRandomAccessWriteDevice, Allocator, WriteHandler>(b, handler));
+}
+
+template <typename AsyncRandomAccessWriteDevice, typename Allocator,
+    typename WriteHandler>
+inline void async_write_at(AsyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, asio::basic_streambuf<Allocator>& b,
+    WriteHandler handler)
+{
+  async_write_at(d, offset, b, transfer_all(), handler);
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WRITE_AT_IPP
diff --git a/ext/asio/io_service.hpp b/ext/asio/io_service.hpp
new file mode 100644
index 0000000000..62d9e54f9c
--- /dev/null
+++ b/ext/asio/io_service.hpp
@@ -0,0 +1,658 @@
+//
+// io_service.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IO_SERVICE_HPP
+#define ASIO_IO_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <stdexcept>
+#include <typeinfo>
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error_code.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/reactor_fwd.hpp"
+#include "asio/detail/service_registry_fwd.hpp"
+#include "asio/detail/signal_init.hpp"
+#include "asio/detail/task_io_service_fwd.hpp"
+#include "asio/detail/win_iocp_io_service_fwd.hpp"
+#include "asio/detail/winsock_init.hpp"
+#include "asio/detail/wrapped_handler.hpp"
+
+namespace asio {
+
+class io_service;
+template <typename Service> Service& use_service(io_service& ios);
+template <typename Service> void add_service(io_service& ios, Service* svc);
+template <typename Service> bool has_service(io_service& ios);
+
+#if defined(ASIO_HAS_IOCP)
+namespace detail { typedef win_iocp_io_service io_service_impl; }
+#else
+namespace detail { typedef task_io_service<reactor> io_service_impl; }
+#endif
+
+/// Provides core I/O functionality.
+/**
+ * The io_service class provides the core I/O functionality for users of the
+ * asynchronous I/O objects, including:
+ *
+ * @li asio::ip::tcp::socket
+ * @li asio::ip::tcp::acceptor
+ * @li asio::ip::udp::socket
+ * @li asio::deadline_timer.
+ *
+ * The io_service class also includes facilities intended for developers of
+ * custom asynchronous services.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe, with the exception that calling reset() while
+ * there are unfinished run(), run_one(), poll() or poll_one() calls results in
+ * undefined behaviour.
+ *
+ * @par Concepts:
+ * Dispatcher.
+ *
+ * @par Synchronous and asynchronous operations
+ *
+ * Synchronous operations on I/O objects implicitly run the io_service object
+ * for an individual operation. The io_service functions run(), run_one(),
+ * poll() or poll_one() must be called for the io_service to perform
+ * asynchronous operations on behalf of a C++ program. Notification that an
+ * asynchronous operation has completed is delivered by invocation of the
+ * associated handler. Handlers are invoked only by a thread that is currently
+ * calling any overload of run(), run_one(), poll() or poll_one() for the
+ * io_service.
+ *
+ * @par Effect of exceptions thrown from handlers
+ *
+ * If an exception is thrown from a handler, the exception is allowed to
+ * propagate through the throwing thread's invocation of run(), run_one(),
+ * poll() or poll_one(). No other threads that are calling any of these
+ * functions are affected. It is then the responsibility of the application to
+ * catch the exception.
+ *
+ * After the exception has been caught, the run(), run_one(), poll() or
+ * poll_one() call may be restarted @em without the need for an intervening
+ * call to reset(). This allows the thread to rejoin the io_service object's
+ * thread pool without impacting any other threads in the pool.
+ *
+ * For example:
+ *
+ * @code
+ * asio::io_service io_service;
+ * ...
+ * for (;;)
+ * {
+ *   try
+ *   {
+ *     io_service.run();
+ *     break; // run() exited normally
+ *   }
+ *   catch (my_exception& e)
+ *   {
+ *     // Deal with exception as appropriate.
+ *   }
+ * }
+ * @endcode
+ *
+ * @par Stopping the io_service from running out of work
+ *
+ * Some applications may need to prevent an io_service object's run() call from
+ * returning when there is no more work to do. For example, the io_service may
+ * be being run in a background thread that is launched prior to the
+ * application's asynchronous operations. The run() call may be kept running by
+ * creating an object of type asio::io_service::work:
+ *
+ * @code asio::io_service io_service;
+ * asio::io_service::work work(io_service);
+ * ... @endcode
+ *
+ * To effect a shutdown, the application will then need to call the io_service
+ * object's stop() member function. This will cause the io_service run() call
+ * to return as soon as possible, abandoning unfinished operations and without
+ * permitting ready handlers to be dispatched.
+ *
+ * Alternatively, if the application requires that all operations and handlers
+ * be allowed to finish normally, the work object may be explicitly destroyed.
+ *
+ * @code asio::io_service io_service;
+ * auto_ptr<asio::io_service::work> work(
+ *     new asio::io_service::work(io_service));
+ * ...
+ * work.reset(); // Allow run() to exit. @endcode
+ *
+ * @par The io_service class and I/O services
+ *
+ * Class io_service implements an extensible, type-safe, polymorphic set of I/O
+ * services, indexed by service type. An object of class io_service must be
+ * initialised before I/O objects such as sockets, resolvers and timers can be
+ * used. These I/O objects are distinguished by having constructors that accept
+ * an @c io_service& parameter.
+ *
+ * I/O services exist to manage the logical interface to the operating system on
+ * behalf of the I/O objects. In particular, there are resources that are shared
+ * across a class of I/O objects. For example, timers may be implemented in
+ * terms of a single timer queue. The I/O services manage these shared
+ * resources.
+ *
+ * Access to the services of an io_service is via three function templates,
+ * use_service(), add_service() and has_service().
+ *
+ * In a call to @c use_service<Service>(), the type argument chooses a service,
+ * making available all members of the named type. If @c Service is not present
+ * in an io_service, an object of type @c Service is created and added to the
+ * io_service. A C++ program can check if an io_service implements a
+ * particular service with the function template @c has_service<Service>().
+ *
+ * Service objects may be explicitly added to an io_service using the function
+ * template @c add_service<Service>(). If the @c Service is already present, the
+ * service_already_exists exception is thrown. If the owner of the service is
+ * not the same object as the io_service parameter, the invalid_service_owner
+ * exception is thrown.
+ *
+ * Once a service reference is obtained from an io_service object by calling
+ * use_service(), that reference remains usable as long as the owning io_service
+ * object exists.
+ *
+ * All I/O service implementations have io_service::service as a public base
+ * class. Custom I/O services may be implemented by deriving from this class and
+ * then added to an io_service using the facilities described above.
+ */
+class io_service
+  : private noncopyable
+{
+private:
+  typedef detail::io_service_impl impl_type;
+#if defined(ASIO_HAS_IOCP)
+  friend class detail::win_iocp_overlapped_ptr;
+#endif
+
+public:
+  class work;
+  friend class work;
+
+  class id;
+
+  class service;
+
+  class strand;
+
+  /// Constructor.
+  io_service();
+
+  /// Constructor.
+  /**
+   * Construct with a hint about the required level of concurrency.
+   *
+   * @param concurrency_hint A suggestion to the implementation on how many
+   * threads it should allow to run simultaneously.
+   */
+  explicit io_service(std::size_t concurrency_hint);
+
+  /// Destructor.
+  /**
+   * On destruction, the io_service performs the following sequence of
+   * operations:
+   *
+   * @li For each service object @c svc in the io_service set, in reverse order
+   * of the beginning of service object lifetime, performs
+   * @c svc->shutdown_service().
+   *
+   * @li Uninvoked handler objects that were scheduled for deferred invocation
+   * on the io_service, or any associated strand, are destroyed.
+   *
+   * @li For each service object @c svc in the io_service set, in reverse order
+   * of the beginning of service object lifetime, performs
+   * <tt>delete static_cast<io_service::service*>(svc)</tt>.
+   *
+   * @note The destruction sequence described above permits programs to
+   * simplify their resource management by using @c shared_ptr<>. Where an
+   * object's lifetime is tied to the lifetime of a connection (or some other
+   * sequence of asynchronous operations), a @c shared_ptr to the object would
+   * be bound into the handlers for all asynchronous operations associated with
+   * it. This works as follows:
+   *
+   * @li When a single connection ends, all associated asynchronous operations
+   * complete. The corresponding handler objects are destroyed, and all
+   * @c shared_ptr references to the objects are destroyed.
+   *
+   * @li To shut down the whole program, the io_service function stop() is
+   * called to terminate any run() calls as soon as possible. The io_service
+   * destructor defined above destroys all handlers, causing all @c shared_ptr
+   * references to all connection objects to be destroyed.
+   */
+  ~io_service();
+
+  /// Run the io_service object's event processing loop.
+  /**
+   * The run() function blocks until all work has finished and there are no
+   * more handlers to be dispatched, or until the io_service has been stopped.
+   *
+   * Multiple threads may call the run() function to set up a pool of threads
+   * from which the io_service may execute handlers. All threads that are
+   * waiting in the pool are equivalent and the io_service may choose any one
+   * of them to invoke a handler.
+   *
+   * The run() function may be safely called again once it has completed only
+   * after a call to reset().
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The run() function must not be called from a thread that is currently
+   * calling one of run(), run_one(), poll() or poll_one() on the same
+   * io_service object.
+   *
+   * The poll() function may also be used to dispatch ready handlers, but
+   * without blocking.
+   */
+  std::size_t run();
+
+  /// Run the io_service object's event processing loop.
+  /**
+   * The run() function blocks until all work has finished and there are no
+   * more handlers to be dispatched, or until the io_service has been stopped.
+   *
+   * Multiple threads may call the run() function to set up a pool of threads
+   * from which the io_service may execute handlers. All threads that are
+   * waiting in the pool are equivalent and the io_service may choose any one
+   * of them to invoke a handler.
+   *
+   * The run() function may be safely called again once it has completed only
+   * after a call to reset().
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @note The run() function must not be called from a thread that is currently
+   * calling one of run(), run_one(), poll() or poll_one() on the same
+   * io_service object.
+   *
+   * The poll() function may also be used to dispatch ready handlers, but
+   * without blocking.
+   */
+  std::size_t run(asio::error_code& ec);
+
+  /// Run the io_service object's event processing loop to execute at most one
+  /// handler.
+  /**
+   * The run_one() function blocks until one handler has been dispatched, or
+   * until the io_service has been stopped.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  std::size_t run_one();
+
+  /// Run the io_service object's event processing loop to execute at most one
+  /// handler.
+  /**
+   * The run_one() function blocks until one handler has been dispatched, or
+   * until the io_service has been stopped.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   */
+  std::size_t run_one(asio::error_code& ec);
+
+  /// Run the io_service object's event processing loop to execute ready
+  /// handlers.
+  /**
+   * The poll() function runs handlers that are ready to run, without blocking,
+   * until the io_service has been stopped or there are no more ready handlers.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  std::size_t poll();
+
+  /// Run the io_service object's event processing loop to execute ready
+  /// handlers.
+  /**
+   * The poll() function runs handlers that are ready to run, without blocking,
+   * until the io_service has been stopped or there are no more ready handlers.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   */
+  std::size_t poll(asio::error_code& ec);
+
+  /// Run the io_service object's event processing loop to execute one ready
+  /// handler.
+  /**
+   * The poll_one() function runs at most one handler that is ready to run,
+   * without blocking.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  std::size_t poll_one();
+
+  /// Run the io_service object's event processing loop to execute one ready
+  /// handler.
+  /**
+   * The poll_one() function runs at most one handler that is ready to run,
+   * without blocking.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   */
+  std::size_t poll_one(asio::error_code& ec);
+
+  /// Stop the io_service object's event processing loop.
+  /**
+   * This function does not block, but instead simply signals the io_service to
+   * stop. All invocations of its run() or run_one() member functions should
+   * return as soon as possible. Subsequent calls to run(), run_one(), poll()
+   * or poll_one() will return immediately until reset() is called.
+   */
+  void stop();
+
+  /// Reset the io_service in preparation for a subsequent run() invocation.
+  /**
+   * This function must be called prior to any second or later set of
+   * invocations of the run(), run_one(), poll() or poll_one() functions when a
+   * previous invocation of these functions returned due to the io_service
+   * being stopped or running out of work. This function allows the io_service
+   * to reset any internal state, such as a "stopped" flag.
+   *
+   * This function must not be called while there are any unfinished calls to
+   * the run(), run_one(), poll() or poll_one() functions.
+   */
+  void reset();
+
+  /// Request the io_service to invoke the given handler.
+  /**
+   * This function is used to ask the io_service to execute the given handler.
+   *
+   * The io_service guarantees that the handler will only be called in a thread
+   * in which the run(), run_one(), poll() or poll_one() member functions is
+   * currently being invoked. The handler may be executed inside this function
+   * if the guarantee can be met.
+   *
+   * @param handler The handler to be called. The io_service will make
+   * a copy of the handler object as required. The function signature of the
+   * handler must be: @code void handler(); @endcode
+   *
+   * @note This function throws an exception only if:
+   *
+   * @li the handler's @c asio_handler_allocate function; or
+   *
+   * @li the handler's copy constructor
+   *
+   * throws an exception.
+   */
+  template <typename CompletionHandler>
+  void dispatch(CompletionHandler handler);
+
+  /// Request the io_service to invoke the given handler and return immediately.
+  /**
+   * This function is used to ask the io_service to execute the given handler,
+   * but without allowing the io_service to call the handler from inside this
+   * function.
+   *
+   * The io_service guarantees that the handler will only be called in a thread
+   * in which the run(), run_one(), poll() or poll_one() member functions is
+   * currently being invoked.
+   *
+   * @param handler The handler to be called. The io_service will make
+   * a copy of the handler object as required. The function signature of the
+   * handler must be: @code void handler(); @endcode
+   *
+   * @note This function throws an exception only if:
+   *
+   * @li the handler's @c asio_handler_allocate function; or
+   *
+   * @li the handler's copy constructor
+   *
+   * throws an exception.
+   */
+  template <typename CompletionHandler>
+  void post(CompletionHandler handler);
+
+  /// Create a new handler that automatically dispatches the wrapped handler
+  /// on the io_service.
+  /**
+   * This function is used to create a new handler function object that, when
+   * invoked, will automatically pass the wrapped handler to the io_service
+   * object's dispatch function.
+   *
+   * @param handler The handler to be wrapped. The io_service will make a copy
+   * of the handler object as required. The function signature of the handler
+   * must be: @code void handler(A1 a1, ... An an); @endcode
+   *
+   * @return A function object that, when invoked, passes the wrapped handler to
+   * the io_service object's dispatch function. Given a function object with the
+   * signature:
+   * @code R f(A1 a1, ... An an); @endcode
+   * If this function object is passed to the wrap function like so:
+   * @code io_service.wrap(f); @endcode
+   * then the return value is a function object with the signature
+   * @code void g(A1 a1, ... An an); @endcode
+   * that, when invoked, executes code equivalent to:
+   * @code io_service.dispatch(boost::bind(f, a1, ... an)); @endcode
+   */
+  template <typename Handler>
+#if defined(GENERATING_DOCUMENTATION)
+  unspecified
+#else
+  detail::wrapped_handler<io_service&, Handler>
+#endif
+  wrap(Handler handler);
+
+  /// Obtain the service object corresponding to the given type.
+  /**
+   * This function is used to locate a service object that corresponds to
+   * the given service type. If there is no existing implementation of the
+   * service, then the io_service will create a new instance of the service.
+   *
+   * @param ios The io_service object that owns the service.
+   *
+   * @return The service interface implementing the specified service type.
+   * Ownership of the service interface is not transferred to the caller.
+   */
+  template <typename Service>
+  friend Service& use_service(io_service& ios);
+
+  /// Add a service object to the io_service.
+  /**
+   * This function is used to add a service to the io_service.
+   *
+   * @param ios The io_service object that owns the service.
+   *
+   * @param svc The service object. On success, ownership of the service object
+   * is transferred to the io_service. When the io_service object is destroyed,
+   * it will destroy the service object by performing:
+   * @code delete static_cast<io_service::service*>(svc) @endcode
+   *
+   * @throws asio::service_already_exists Thrown if a service of the
+   * given type is already present in the io_service.
+   *
+   * @throws asio::invalid_service_owner Thrown if the service's owning
+   * io_service is not the io_service object specified by the ios parameter.
+   */
+  template <typename Service>
+  friend void add_service(io_service& ios, Service* svc);
+
+  /// Determine if an io_service contains a specified service type.
+  /**
+   * This function is used to determine whether the io_service contains a
+   * service object corresponding to the given service type.
+   *
+   * @param ios The io_service object that owns the service.
+   *
+   * @return A boolean indicating whether the io_service contains the service.
+   */
+  template <typename Service>
+  friend bool has_service(io_service& ios);
+
+private:
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  detail::winsock_init<> init_;
+#elif defined(__sun) || defined(__QNX__) || defined(__hpux) || defined(_AIX) \
+  || defined(__osf__)
+  detail::signal_init<> init_;
+#endif
+
+  // The service registry.
+  asio::detail::service_registry* service_registry_;
+
+  // The implementation.
+  impl_type& impl_;
+};
+
+/// Class to inform the io_service when it has work to do.
+/**
+ * The work class is used to inform the io_service when work starts and
+ * finishes. This ensures that the io_service object's run() function will not
+ * exit while work is underway, and that it does exit when there is no
+ * unfinished work remaining.
+ *
+ * The work class is copy-constructible so that it may be used as a data member
+ * in a handler class. It is not assignable.
+ */
+class io_service::work
+{
+public:
+  /// Constructor notifies the io_service that work is starting.
+  /**
+   * The constructor is used to inform the io_service that some work has begun.
+   * This ensures that the io_service object's run() function will not exit
+   * while the work is underway.
+   */
+  explicit work(asio::io_service& io_service);
+
+  /// Copy constructor notifies the io_service that work is starting.
+  /**
+   * The constructor is used to inform the io_service that some work has begun.
+   * This ensures that the io_service object's run() function will not exit
+   * while the work is underway.
+   */
+  work(const work& other);
+
+  /// Destructor notifies the io_service that the work is complete.
+  /**
+   * The destructor is used to inform the io_service that some work has
+   * finished. Once the count of unfinished work reaches zero, the io_service
+   * object's run() function is permitted to exit.
+   */
+  ~work();
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with the
+  /// work.
+  asio::io_service& io_service();
+
+  /// Get the io_service associated with the work.
+  asio::io_service& get_io_service();
+
+private:
+  // Prevent assignment.
+  void operator=(const work& other);
+
+  // The io_service.
+  asio::io_service& io_service_;
+};
+
+/// Class used to uniquely identify a service.
+class io_service::id
+  : private noncopyable
+{
+public:
+  /// Constructor.
+  id() {}
+};
+
+/// Base class for all io_service services.
+class io_service::service
+  : private noncopyable
+{
+public:
+  /// (Deprecated: use get_io_service().) Get the io_service object that owns
+  /// the service.
+  asio::io_service& io_service();
+
+  /// Get the io_service object that owns the service.
+  asio::io_service& get_io_service();
+
+protected:
+  /// Constructor.
+  /**
+   * @param owner The io_service object that owns the service.
+   */
+  service(asio::io_service& owner);
+
+  /// Destructor.
+  virtual ~service();
+
+private:
+  /// Destroy all user-defined handler objects owned by the service.
+  virtual void shutdown_service() = 0;
+
+  friend class asio::detail::service_registry;
+  struct key
+  {
+    key() : type_info_(0), id_(0) {}
+    const std::type_info* type_info_;
+    const asio::io_service::id* id_;
+  } key_;
+
+  asio::io_service& owner_;
+  service* next_;
+};
+
+/// Exception thrown when trying to add a duplicate service to an io_service.
+class service_already_exists
+  : public std::logic_error
+{
+public:
+  service_already_exists()
+    : std::logic_error("Service already exists.")
+  {
+  }
+};
+
+/// Exception thrown when trying to add a service object to an io_service where
+/// the service has a different owner.
+class invalid_service_owner
+  : public std::logic_error
+{
+public:
+  invalid_service_owner()
+    : std::logic_error("Invalid service owner.")
+  {
+  }
+};
+
+} // namespace asio
+
+#include "asio/impl/io_service.ipp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IO_SERVICE_HPP
diff --git a/ext/asio/ip/address.hpp b/ext/asio/ip/address.hpp
new file mode 100644
index 0000000000..92ee4ae43d
--- /dev/null
+++ b/ext/asio/ip/address.hpp
@@ -0,0 +1,284 @@
+//
+// address.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_ADDRESS_HPP
+#define ASIO_IP_ADDRESS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_IOSTREAM)
+# include <iosfwd>
+#endif // !defined(BOOST_NO_IOSTREAM)
+#include <string>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/ip/address_v4.hpp"
+#include "asio/ip/address_v6.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Implements version-independent IP addresses.
+/**
+ * The asio::ip::address class provides the ability to use either IP
+ * version 4 or version 6 addresses.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class address
+{
+public:
+  /// Default constructor.
+  address()
+    : type_(ipv4),
+      ipv4_address_(),
+      ipv6_address_()
+  {
+  }
+
+  /// Construct an address from an IPv4 address.
+  address(const asio::ip::address_v4& ipv4_address)
+    : type_(ipv4),
+      ipv4_address_(ipv4_address),
+      ipv6_address_()
+  {
+  }
+
+  /// Construct an address from an IPv6 address.
+  address(const asio::ip::address_v6& ipv6_address)
+    : type_(ipv6),
+      ipv4_address_(),
+      ipv6_address_(ipv6_address)
+  {
+  }
+
+  /// Copy constructor.
+  address(const address& other)
+    : type_(other.type_),
+      ipv4_address_(other.ipv4_address_),
+      ipv6_address_(other.ipv6_address_)
+  {
+  }
+
+  /// Assign from another address.
+  address& operator=(const address& other)
+  {
+    type_ = other.type_;
+    ipv4_address_ = other.ipv4_address_;
+    ipv6_address_ = other.ipv6_address_;
+    return *this;
+  }
+
+  /// Assign from an IPv4 address.
+  address& operator=(const asio::ip::address_v4& ipv4_address)
+  {
+    type_ = ipv4;
+    ipv4_address_ = ipv4_address;
+    ipv6_address_ = asio::ip::address_v6();
+    return *this;
+  }
+
+  /// Assign from an IPv6 address.
+  address& operator=(const asio::ip::address_v6& ipv6_address)
+  {
+    type_ = ipv6;
+    ipv4_address_ = asio::ip::address_v4();
+    ipv6_address_ = ipv6_address;
+    return *this;
+  }
+
+  /// Get whether the address is an IP version 4 address.
+  bool is_v4() const
+  {
+    return type_ == ipv4;
+  }
+
+  /// Get whether the address is an IP version 6 address.
+  bool is_v6() const
+  {
+    return type_ == ipv6;
+  }
+
+  /// Get the address as an IP version 4 address.
+  asio::ip::address_v4 to_v4() const
+  {
+    if (type_ != ipv4)
+    {
+      asio::system_error e(
+          asio::error::address_family_not_supported);
+      boost::throw_exception(e);
+    }
+    return ipv4_address_;
+  }
+
+  /// Get the address as an IP version 6 address.
+  asio::ip::address_v6 to_v6() const
+  {
+    if (type_ != ipv6)
+    {
+      asio::system_error e(
+          asio::error::address_family_not_supported);
+      boost::throw_exception(e);
+    }
+    return ipv6_address_;
+  }
+
+  /// Get the address as a string in dotted decimal format.
+  std::string to_string() const
+  {
+    if (type_ == ipv6)
+      return ipv6_address_.to_string();
+    return ipv4_address_.to_string();
+  }
+
+  /// Get the address as a string in dotted decimal format.
+  std::string to_string(asio::error_code& ec) const
+  {
+    if (type_ == ipv6)
+      return ipv6_address_.to_string(ec);
+    return ipv4_address_.to_string(ec);
+  }
+
+  /// Create an address from an IPv4 address string in dotted decimal form,
+  /// or from an IPv6 address in hexadecimal notation.
+  static address from_string(const char* str)
+  {
+    asio::error_code ec;
+    address addr = from_string(str, ec);
+    asio::detail::throw_error(ec);
+    return addr;
+  }
+
+  /// Create an address from an IPv4 address string in dotted decimal form,
+  /// or from an IPv6 address in hexadecimal notation.
+  static address from_string(const char* str, asio::error_code& ec)
+  {
+    asio::ip::address_v6 ipv6_address =
+      asio::ip::address_v6::from_string(str, ec);
+    if (!ec)
+    {
+      address tmp;
+      tmp.type_ = ipv6;
+      tmp.ipv6_address_ = ipv6_address;
+      return tmp;
+    }
+
+    asio::ip::address_v4 ipv4_address =
+      asio::ip::address_v4::from_string(str, ec);
+    if (!ec)
+    {
+      address tmp;
+      tmp.type_ = ipv4;
+      tmp.ipv4_address_ = ipv4_address;
+      return tmp;
+    }
+
+    return address();
+  }
+
+  /// Create an address from an IPv4 address string in dotted decimal form,
+  /// or from an IPv6 address in hexadecimal notation.
+  static address from_string(const std::string& str)
+  {
+    return from_string(str.c_str());
+  }
+
+  /// Create an address from an IPv4 address string in dotted decimal form,
+  /// or from an IPv6 address in hexadecimal notation.
+  static address from_string(const std::string& str,
+      asio::error_code& ec)
+  {
+    return from_string(str.c_str(), ec);
+  }
+
+  /// Compare two addresses for equality.
+  friend bool operator==(const address& a1, const address& a2)
+  {
+    if (a1.type_ != a2.type_)
+      return false;
+    if (a1.type_ == ipv6)
+      return a1.ipv6_address_ == a2.ipv6_address_;
+    return a1.ipv4_address_ == a2.ipv4_address_;
+  }
+
+  /// Compare two addresses for inequality.
+  friend bool operator!=(const address& a1, const address& a2)
+  {
+    if (a1.type_ != a2.type_)
+      return true;
+    if (a1.type_ == ipv6)
+      return a1.ipv6_address_ != a2.ipv6_address_;
+    return a1.ipv4_address_ != a2.ipv4_address_;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<(const address& a1, const address& a2)
+  {
+    if (a1.type_ < a2.type_)
+      return true;
+    if (a1.type_ > a2.type_)
+      return false;
+    if (a1.type_ == ipv6)
+      return a1.ipv6_address_ < a2.ipv6_address_;
+    return a1.ipv4_address_ < a2.ipv4_address_;
+  }
+
+private:
+  // The type of the address.
+  enum { ipv4, ipv6 } type_;
+
+  // The underlying IPv4 address.
+  asio::ip::address_v4 ipv4_address_;
+
+  // The underlying IPv6 address.
+  asio::ip::address_v6 ipv6_address_;
+};
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Output an address as a string.
+/**
+ * Used to output a human-readable string for a specified address.
+ *
+ * @param os The output stream to which the string will be written.
+ *
+ * @param addr The address to be written.
+ *
+ * @return The output stream.
+ *
+ * @relates asio::ip::address
+ */
+template <typename Elem, typename Traits>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os, const address& addr)
+{
+  os << addr.to_string();
+  return os;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_ADDRESS_HPP
diff --git a/ext/asio/ip/address_v4.hpp b/ext/asio/ip/address_v4.hpp
new file mode 100644
index 0000000000..1b495560fe
--- /dev/null
+++ b/ext/asio/ip/address_v4.hpp
@@ -0,0 +1,315 @@
+//
+// address_v4.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_ADDRESS_V4_HPP
+#define ASIO_IP_ADDRESS_V4_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_IOSTREAM)
+# include <iosfwd>
+#endif // !defined(BOOST_NO_IOSTREAM)
+#include <climits>
+#include <string>
+#include <stdexcept>
+#include <boost/array.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Implements IP version 4 style addresses.
+/**
+ * The asio::ip::address_v4 class provides the ability to use and
+ * manipulate IP version 4 addresses.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class address_v4
+{
+public:
+  /// The type used to represent an address as an array of bytes.
+  typedef boost::array<unsigned char, 4> bytes_type;
+
+  /// Default constructor.
+  address_v4()
+  {
+    addr_.s_addr = 0;
+  }
+
+  /// Construct an address from raw bytes.
+  explicit address_v4(const bytes_type& bytes)
+  {
+#if UCHAR_MAX > 0xFF
+    if (bytes[0] > 0xFF || bytes[1] > 0xFF
+        || bytes[2] > 0xFF || bytes[3] > 0xFF)
+    {
+      std::out_of_range ex("address_v4 from bytes_type");
+      boost::throw_exception(ex);
+    }
+#endif // UCHAR_MAX > 0xFF
+
+    using namespace std; // For memcpy.
+    memcpy(&addr_.s_addr, bytes.elems, 4);
+  }
+
+  /// Construct an address from a unsigned long in host byte order.
+  explicit address_v4(unsigned long addr)
+  {
+#if ULONG_MAX > 0xFFFFFFFF
+    if (addr > 0xFFFFFFFF)
+    {
+      std::out_of_range ex("address_v4 from unsigned long");
+      boost::throw_exception(ex);
+    }
+#endif // ULONG_MAX > 0xFFFFFFFF
+
+    addr_.s_addr = asio::detail::socket_ops::host_to_network_long(addr);
+  }
+
+  /// Copy constructor.
+  address_v4(const address_v4& other)
+    : addr_(other.addr_)
+  {
+  }
+
+  /// Assign from another address.
+  address_v4& operator=(const address_v4& other)
+  {
+    addr_ = other.addr_;
+    return *this;
+  }
+
+  /// Get the address in bytes, in network byte order.
+  bytes_type to_bytes() const
+  {
+    using namespace std; // For memcpy.
+    bytes_type bytes;
+    memcpy(bytes.elems, &addr_.s_addr, 4);
+    return bytes;
+  }
+
+  /// Get the address as an unsigned long in host byte order
+  unsigned long to_ulong() const
+  {
+    return asio::detail::socket_ops::network_to_host_long(addr_.s_addr);
+  }
+
+  /// Get the address as a string in dotted decimal format.
+  std::string to_string() const
+  {
+    asio::error_code ec;
+    std::string addr = to_string(ec);
+    asio::detail::throw_error(ec);
+    return addr;
+  }
+
+  /// Get the address as a string in dotted decimal format.
+  std::string to_string(asio::error_code& ec) const
+  {
+    char addr_str[asio::detail::max_addr_v4_str_len];
+    const char* addr =
+      asio::detail::socket_ops::inet_ntop(AF_INET, &addr_, addr_str,
+          asio::detail::max_addr_v4_str_len, 0, ec);
+    if (addr == 0)
+      return std::string();
+    return addr;
+  }
+
+  /// Create an address from an IP address string in dotted decimal form.
+  static address_v4 from_string(const char* str)
+  {
+    asio::error_code ec;
+    address_v4 addr = from_string(str, ec);
+    asio::detail::throw_error(ec);
+    return addr;
+  }
+
+  /// Create an address from an IP address string in dotted decimal form.
+  static address_v4 from_string(const char* str, asio::error_code& ec)
+  {
+    address_v4 tmp;
+    if (asio::detail::socket_ops::inet_pton(
+          AF_INET, str, &tmp.addr_, 0, ec) <= 0)
+      return address_v4();
+    return tmp;
+  }
+
+  /// Create an address from an IP address string in dotted decimal form.
+  static address_v4 from_string(const std::string& str)
+  {
+    return from_string(str.c_str());
+  }
+
+  /// Create an address from an IP address string in dotted decimal form.
+  static address_v4 from_string(const std::string& str,
+      asio::error_code& ec)
+  {
+    return from_string(str.c_str(), ec);
+  }
+
+  /// Determine whether the address is a class A address.
+  bool is_class_a() const
+  {
+    return IN_CLASSA(to_ulong());
+  }
+
+  /// Determine whether the address is a class B address.
+  bool is_class_b() const
+  {
+    return IN_CLASSB(to_ulong());
+  }
+
+  /// Determine whether the address is a class C address.
+  bool is_class_c() const
+  {
+    return IN_CLASSC(to_ulong());
+  }
+
+  /// Determine whether the address is a multicast address.
+  bool is_multicast() const
+  {
+    return IN_MULTICAST(to_ulong());
+  }
+
+  /// Compare two addresses for equality.
+  friend bool operator==(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.addr_.s_addr == a2.addr_.s_addr;
+  }
+
+  /// Compare two addresses for inequality.
+  friend bool operator!=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.addr_.s_addr != a2.addr_.s_addr;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_ulong() < a2.to_ulong();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_ulong() > a2.to_ulong();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_ulong() <= a2.to_ulong();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_ulong() >= a2.to_ulong();
+  }
+
+  /// Obtain an address object that represents any address.
+  static address_v4 any()
+  {
+    return address_v4(static_cast<unsigned long>(INADDR_ANY));
+  }
+
+  /// Obtain an address object that represents the loopback address.
+  static address_v4 loopback()
+  {
+    return address_v4(static_cast<unsigned long>(INADDR_LOOPBACK));
+  }
+
+  /// Obtain an address object that represents the broadcast address.
+  static address_v4 broadcast()
+  {
+    return address_v4(static_cast<unsigned long>(INADDR_BROADCAST));
+  }
+
+  /// Obtain an address object that represents the broadcast address that
+  /// corresponds to the specified address and netmask.
+  static address_v4 broadcast(const address_v4& addr, const address_v4& mask)
+  {
+    return address_v4(addr.to_ulong() | ~mask.to_ulong());
+  }
+
+  /// Obtain the netmask that corresponds to the address, based on its address
+  /// class.
+  static address_v4 netmask(const address_v4& addr)
+  {
+    if (addr.is_class_a())
+      return address_v4(0xFF000000);
+    if (addr.is_class_b())
+      return address_v4(0xFFFF0000);
+    if (addr.is_class_c())
+      return address_v4(0xFFFFFF00);
+    return address_v4(0xFFFFFFFF);
+  }
+
+private:
+  // The underlying IPv4 address.
+  asio::detail::in4_addr_type addr_;
+};
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Output an address as a string.
+/**
+ * Used to output a human-readable string for a specified address.
+ *
+ * @param os The output stream to which the string will be written.
+ *
+ * @param addr The address to be written.
+ *
+ * @return The output stream.
+ *
+ * @relates asio::ip::address_v4
+ */
+template <typename Elem, typename Traits>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os, const address_v4& addr)
+{
+  asio::error_code ec;
+  std::string s = addr.to_string(ec);
+  if (ec)
+  {
+    if (os.exceptions() & std::ios::failbit)
+      asio::detail::throw_error(ec);
+    else
+      os.setstate(std::ios_base::failbit);
+  }
+  else
+    for (std::string::iterator i = s.begin(); i != s.end(); ++i)
+      os << os.widen(*i);
+  return os;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_ADDRESS_V4_HPP
diff --git a/ext/asio/ip/address_v6.hpp b/ext/asio/ip/address_v6.hpp
new file mode 100644
index 0000000000..8d2c08393d
--- /dev/null
+++ b/ext/asio/ip/address_v6.hpp
@@ -0,0 +1,429 @@
+//
+// address_v6.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_ADDRESS_V6_HPP
+#define ASIO_IP_ADDRESS_V6_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_IOSTREAM)
+# include <iosfwd>
+#endif // !defined(BOOST_NO_IOSTREAM)
+#include <cstring>
+#include <string>
+#include <stdexcept>
+#include <typeinfo>
+#include <boost/array.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/throw_error.hpp"
+#include "asio/ip/address_v4.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Implements IP version 6 style addresses.
+/**
+ * The asio::ip::address_v6 class provides the ability to use and
+ * manipulate IP version 6 addresses.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class address_v6
+{
+public:
+  /// The type used to represent an address as an array of bytes.
+  typedef boost::array<unsigned char, 16> bytes_type;
+
+  /// Default constructor.
+  address_v6()
+    : scope_id_(0)
+  {
+    asio::detail::in6_addr_type tmp_addr = IN6ADDR_ANY_INIT;
+    addr_ = tmp_addr;
+  }
+
+  /// Construct an address from raw bytes and scope ID.
+  explicit address_v6(const bytes_type& bytes, unsigned long scope_id = 0)
+    : scope_id_(scope_id)
+  {
+#if UCHAR_MAX > 0xFF
+    for (std::size_t i = 0; i < bytes.size(); ++i)
+    {
+      if (bytes[i] > 0xFF)
+      {
+        std::out_of_range ex("address_v6 from bytes_type");
+        boost::throw_exception(ex);
+      }
+    }
+#endif // UCHAR_MAX > 0xFF
+
+    using namespace std; // For memcpy.
+    memcpy(addr_.s6_addr, bytes.elems, 16);
+  }
+
+  /// Copy constructor.
+  address_v6(const address_v6& other)
+    : addr_(other.addr_),
+      scope_id_(other.scope_id_)
+  {
+  }
+
+  /// Assign from another address.
+  address_v6& operator=(const address_v6& other)
+  {
+    addr_ = other.addr_;
+    scope_id_ = other.scope_id_;
+    return *this;
+  }
+
+  /// The scope ID of the address.
+  /**
+   * Returns the scope ID associated with the IPv6 address.
+   */
+  unsigned long scope_id() const
+  {
+    return scope_id_;
+  }
+
+  /// The scope ID of the address.
+  /**
+   * Modifies the scope ID associated with the IPv6 address.
+   */
+  void scope_id(unsigned long id)
+  {
+    scope_id_ = id;
+  }
+
+  /// Get the address in bytes, in network byte order.
+  bytes_type to_bytes() const
+  {
+    using namespace std; // For memcpy.
+    bytes_type bytes;
+    memcpy(bytes.elems, addr_.s6_addr, 16);
+    return bytes;
+  }
+
+  /// Get the address as a string.
+  std::string to_string() const
+  {
+    asio::error_code ec;
+    std::string addr = to_string(ec);
+    asio::detail::throw_error(ec);
+    return addr;
+  }
+
+  /// Get the address as a string.
+  std::string to_string(asio::error_code& ec) const
+  {
+    char addr_str[asio::detail::max_addr_v6_str_len];
+    const char* addr =
+      asio::detail::socket_ops::inet_ntop(AF_INET6, &addr_, addr_str,
+          asio::detail::max_addr_v6_str_len, scope_id_, ec);
+    if (addr == 0)
+      return std::string();
+    return addr;
+  }
+
+  /// Create an address from an IP address string.
+  static address_v6 from_string(const char* str)
+  {
+    asio::error_code ec;
+    address_v6 addr = from_string(str, ec);
+    asio::detail::throw_error(ec);
+    return addr;
+  }
+
+  /// Create an address from an IP address string.
+  static address_v6 from_string(const char* str, asio::error_code& ec)
+  {
+    address_v6 tmp;
+    if (asio::detail::socket_ops::inet_pton(
+          AF_INET6, str, &tmp.addr_, &tmp.scope_id_, ec) <= 0)
+      return address_v6();
+    return tmp;
+  }
+
+  /// Create an address from an IP address string.
+  static address_v6 from_string(const std::string& str)
+  {
+    return from_string(str.c_str());
+  }
+
+  /// Create an address from an IP address string.
+  static address_v6 from_string(const std::string& str,
+      asio::error_code& ec)
+  {
+    return from_string(str.c_str(), ec);
+  }
+
+  /// Converts an IPv4-mapped or IPv4-compatible address to an IPv4 address.
+  address_v4 to_v4() const
+  {
+    if (!is_v4_mapped() && !is_v4_compatible())
+    {
+      std::bad_cast ex;
+      boost::throw_exception(ex);
+    }
+
+    address_v4::bytes_type v4_bytes = { { addr_.s6_addr[12],
+      addr_.s6_addr[13], addr_.s6_addr[14], addr_.s6_addr[15] } };
+    return address_v4(v4_bytes);
+  }
+
+  /// Determine whether the address is a loopback address.
+  bool is_loopback() const
+  {
+#if defined(__BORLANDC__)
+    return ((addr_.s6_addr[0] == 0) && (addr_.s6_addr[1] == 0)
+        && (addr_.s6_addr[2] == 0) && (addr_.s6_addr[3] == 0)
+        && (addr_.s6_addr[4] == 0) && (addr_.s6_addr[5] == 0)
+        && (addr_.s6_addr[6] == 0) && (addr_.s6_addr[7] == 0)
+        && (addr_.s6_addr[8] == 0) && (addr_.s6_addr[9] == 0)
+        && (addr_.s6_addr[10] == 0) && (addr_.s6_addr[11] == 0)
+        && (addr_.s6_addr[12] == 0) && (addr_.s6_addr[13] == 0)
+        && (addr_.s6_addr[14] == 0) && (addr_.s6_addr[15] == 1));
+#else
+    using namespace asio::detail;
+    return IN6_IS_ADDR_LOOPBACK(&addr_) != 0;
+#endif
+  }
+
+  /// Determine whether the address is unspecified.
+  bool is_unspecified() const
+  {
+#if defined(__BORLANDC__)
+    return ((addr_.s6_addr[0] == 0) && (addr_.s6_addr[1] == 0)
+        && (addr_.s6_addr[2] == 0) && (addr_.s6_addr[3] == 0)
+        && (addr_.s6_addr[4] == 0) && (addr_.s6_addr[5] == 0)
+        && (addr_.s6_addr[6] == 0) && (addr_.s6_addr[7] == 0)
+        && (addr_.s6_addr[8] == 0) && (addr_.s6_addr[9] == 0)
+        && (addr_.s6_addr[10] == 0) && (addr_.s6_addr[11] == 0)
+        && (addr_.s6_addr[12] == 0) && (addr_.s6_addr[13] == 0)
+        && (addr_.s6_addr[14] == 0) && (addr_.s6_addr[15] == 0));
+#else
+    using namespace asio::detail;
+    return IN6_IS_ADDR_UNSPECIFIED(&addr_) != 0;
+#endif
+  }
+
+  /// Determine whether the address is link local.
+  bool is_link_local() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_LINKLOCAL(&addr_) != 0;
+  }
+
+  /// Determine whether the address is site local.
+  bool is_site_local() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_SITELOCAL(&addr_) != 0;
+  }
+
+  /// Determine whether the address is a mapped IPv4 address.
+  bool is_v4_mapped() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_V4MAPPED(&addr_) != 0;
+  }
+
+  /// Determine whether the address is an IPv4-compatible address.
+  bool is_v4_compatible() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_V4COMPAT(&addr_) != 0;
+  }
+
+  /// Determine whether the address is a multicast address.
+  bool is_multicast() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_MULTICAST(&addr_) != 0;
+  }
+
+  /// Determine whether the address is a global multicast address.
+  bool is_multicast_global() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_MC_GLOBAL(&addr_) != 0;
+  }
+
+  /// Determine whether the address is a link-local multicast address.
+  bool is_multicast_link_local() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_MC_LINKLOCAL(&addr_) != 0;
+  }
+
+  /// Determine whether the address is a node-local multicast address.
+  bool is_multicast_node_local() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_MC_NODELOCAL(&addr_) != 0;
+  }
+
+  /// Determine whether the address is a org-local multicast address.
+  bool is_multicast_org_local() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_MC_ORGLOCAL(&addr_) != 0;
+  }
+
+  /// Determine whether the address is a site-local multicast address.
+  bool is_multicast_site_local() const
+  {
+    using namespace asio::detail;
+    return IN6_IS_ADDR_MC_SITELOCAL(&addr_) != 0;
+  }
+
+  /// Compare two addresses for equality.
+  friend bool operator==(const address_v6& a1, const address_v6& a2)
+  {
+    using namespace std; // For memcmp.
+    return memcmp(&a1.addr_, &a2.addr_,
+        sizeof(asio::detail::in6_addr_type)) == 0
+      && a1.scope_id_ == a2.scope_id_;
+  }
+
+  /// Compare two addresses for inequality.
+  friend bool operator!=(const address_v6& a1, const address_v6& a2)
+  {
+    using namespace std; // For memcmp.
+    return memcmp(&a1.addr_, &a2.addr_,
+        sizeof(asio::detail::in6_addr_type)) != 0
+      || a1.scope_id_ != a2.scope_id_;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<(const address_v6& a1, const address_v6& a2)
+  {
+    using namespace std; // For memcmp.
+    int memcmp_result = memcmp(&a1.addr_, &a2.addr_,
+        sizeof(asio::detail::in6_addr_type));
+    if (memcmp_result < 0)
+      return true;
+    if (memcmp_result > 0)
+      return false;
+    return a1.scope_id_ < a2.scope_id_;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>(const address_v6& a1, const address_v6& a2)
+  {
+    return a2 < a1;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<=(const address_v6& a1, const address_v6& a2)
+  {
+    return !(a2 < a1);
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>=(const address_v6& a1, const address_v6& a2)
+  {
+    return !(a1 < a2);
+  }
+
+  /// Obtain an address object that represents any address.
+  static address_v6 any()
+  {
+    return address_v6();
+  }
+
+  /// Obtain an address object that represents the loopback address.
+  static address_v6 loopback()
+  {
+    address_v6 tmp;
+    asio::detail::in6_addr_type tmp_addr = IN6ADDR_LOOPBACK_INIT;
+    tmp.addr_ = tmp_addr;
+    return tmp;
+  }
+
+  /// Create an IPv4-mapped IPv6 address.
+  static address_v6 v4_mapped(const address_v4& addr)
+  {
+    address_v4::bytes_type v4_bytes = addr.to_bytes();
+    bytes_type v6_bytes = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF,
+      v4_bytes[0], v4_bytes[1], v4_bytes[2], v4_bytes[3] } };
+    return address_v6(v6_bytes);
+  }
+
+  /// Create an IPv4-compatible IPv6 address.
+  static address_v6 v4_compatible(const address_v4& addr)
+  {
+    address_v4::bytes_type v4_bytes = addr.to_bytes();
+    bytes_type v6_bytes = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+      v4_bytes[0], v4_bytes[1], v4_bytes[2], v4_bytes[3] } };
+    return address_v6(v6_bytes);
+  }
+
+private:
+  // The underlying IPv6 address.
+  asio::detail::in6_addr_type addr_;
+
+  // The scope ID associated with the address.
+  unsigned long scope_id_;
+};
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Output an address as a string.
+/**
+ * Used to output a human-readable string for a specified address.
+ *
+ * @param os The output stream to which the string will be written.
+ *
+ * @param addr The address to be written.
+ *
+ * @return The output stream.
+ *
+ * @relates asio::ip::address_v6
+ */
+template <typename Elem, typename Traits>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os, const address_v6& addr)
+{
+  asio::error_code ec;
+  std::string s = addr.to_string(ec);
+  if (ec)
+  {
+    if (os.exceptions() & std::ios::failbit)
+      asio::detail::throw_error(ec);
+    else
+      os.setstate(std::ios_base::failbit);
+  }
+  else
+    for (std::string::iterator i = s.begin(); i != s.end(); ++i)
+      os << os.widen(*i);
+  return os;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_ADDRESS_V6_HPP
diff --git a/ext/asio/ip/basic_endpoint.hpp b/ext/asio/ip/basic_endpoint.hpp
new file mode 100644
index 0000000000..4ad3f682b7
--- /dev/null
+++ b/ext/asio/ip/basic_endpoint.hpp
@@ -0,0 +1,382 @@
+//
+// basic_endpoint.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_BASIC_ENDPOINT_HPP
+#define ASIO_IP_BASIC_ENDPOINT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/detail/workaround.hpp>
+#include <cstring>
+#if !defined(BOOST_NO_IOSTREAM)
+# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+#  include <ostream>
+# endif // BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+# include <sstream>
+#endif // !defined(BOOST_NO_IOSTREAM)
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/ip/address.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Describes an endpoint for a version-independent IP socket.
+/**
+ * The asio::ip::basic_endpoint class template describes an endpoint that
+ * may be associated with a particular socket.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * Endpoint.
+ */
+template <typename InternetProtocol>
+class basic_endpoint
+{
+public:
+  /// The protocol type associated with the endpoint.
+  typedef InternetProtocol protocol_type;
+
+  /// The type of the endpoint structure. This type is dependent on the
+  /// underlying implementation of the socket layer.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined data_type;
+#else
+  typedef asio::detail::socket_addr_type data_type;
+#endif
+
+  /// Default constructor.
+  basic_endpoint()
+    : data_()
+  {
+    data_.v4.sin_family = AF_INET;
+    data_.v4.sin_port = 0;
+    data_.v4.sin_addr.s_addr = INADDR_ANY;
+  }
+
+  /// Construct an endpoint using a port number, specified in the host's byte
+  /// order. The IP address will be the any address (i.e. INADDR_ANY or
+  /// in6addr_any). This constructor would typically be used for accepting new
+  /// connections.
+  /**
+   * @par Examples
+   * To initialise an IPv4 TCP endpoint for port 1234, use:
+   * @code
+   * asio::ip::tcp::endpoint ep(asio::ip::tcp::v4(), 1234);
+   * @endcode
+   *
+   * To specify an IPv6 UDP endpoint for port 9876, use:
+   * @code
+   * asio::ip::udp::endpoint ep(asio::ip::udp::v6(), 9876);
+   * @endcode
+   */
+  basic_endpoint(const InternetProtocol& protocol, unsigned short port_num)
+    : data_()
+  {
+    using namespace std; // For memcpy.
+    if (protocol.family() == PF_INET)
+    {
+      data_.v4.sin_family = AF_INET;
+      data_.v4.sin_port =
+        asio::detail::socket_ops::host_to_network_short(port_num);
+      data_.v4.sin_addr.s_addr = INADDR_ANY;
+    }
+    else
+    {
+      data_.v6.sin6_family = AF_INET6;
+      data_.v6.sin6_port =
+        asio::detail::socket_ops::host_to_network_short(port_num);
+      data_.v6.sin6_flowinfo = 0;
+      asio::detail::in6_addr_type tmp_addr = IN6ADDR_ANY_INIT;
+      data_.v6.sin6_addr = tmp_addr;
+      data_.v6.sin6_scope_id = 0;
+    }
+  }
+
+  /// Construct an endpoint using a port number and an IP address. This
+  /// constructor may be used for accepting connections on a specific interface
+  /// or for making a connection to a remote endpoint.
+  basic_endpoint(const asio::ip::address& addr, unsigned short port_num)
+    : data_()
+  {
+    using namespace std; // For memcpy.
+    if (addr.is_v4())
+    {
+      data_.v4.sin_family = AF_INET;
+      data_.v4.sin_port =
+        asio::detail::socket_ops::host_to_network_short(port_num);
+      data_.v4.sin_addr.s_addr =
+        asio::detail::socket_ops::host_to_network_long(
+            addr.to_v4().to_ulong());
+    }
+    else
+    {
+      data_.v6.sin6_family = AF_INET6;
+      data_.v6.sin6_port =
+        asio::detail::socket_ops::host_to_network_short(port_num);
+      data_.v6.sin6_flowinfo = 0;
+      asio::ip::address_v6 v6_addr = addr.to_v6();
+      asio::ip::address_v6::bytes_type bytes = v6_addr.to_bytes();
+      memcpy(data_.v6.sin6_addr.s6_addr, bytes.elems, 16);
+      data_.v6.sin6_scope_id = v6_addr.scope_id();
+    }
+  }
+
+  /// Copy constructor.
+  basic_endpoint(const basic_endpoint& other)
+    : data_(other.data_)
+  {
+  }
+
+  /// Assign from another endpoint.
+  basic_endpoint& operator=(const basic_endpoint& other)
+  {
+    data_ = other.data_;
+    return *this;
+  }
+
+  /// The protocol associated with the endpoint.
+  protocol_type protocol() const
+  {
+    if (is_v4())
+      return InternetProtocol::v4();
+    return InternetProtocol::v6();
+  }
+
+  /// Get the underlying endpoint in the native type.
+  data_type* data()
+  {
+    return &data_.base;
+  }
+
+  /// Get the underlying endpoint in the native type.
+  const data_type* data() const
+  {
+    return &data_.base;
+  }
+
+  /// Get the underlying size of the endpoint in the native type.
+  std::size_t size() const
+  {
+    if (is_v4())
+      return sizeof(asio::detail::sockaddr_in4_type);
+    else
+      return sizeof(asio::detail::sockaddr_in6_type);
+  }
+
+  /// Set the underlying size of the endpoint in the native type.
+  void resize(std::size_t size)
+  {
+    if (size > sizeof(asio::detail::sockaddr_storage_type))
+    {
+      asio::system_error e(asio::error::invalid_argument);
+      boost::throw_exception(e);
+    }
+  }
+
+  /// Get the capacity of the endpoint in the native type.
+  std::size_t capacity() const
+  {
+    return sizeof(asio::detail::sockaddr_storage_type);
+  }
+
+  /// Get the port associated with the endpoint. The port number is always in
+  /// the host's byte order.
+  unsigned short port() const
+  {
+    if (is_v4())
+    {
+      return asio::detail::socket_ops::network_to_host_short(
+          data_.v4.sin_port);
+    }
+    else
+    {
+      return asio::detail::socket_ops::network_to_host_short(
+          data_.v6.sin6_port);
+    }
+  }
+
+  /// Set the port associated with the endpoint. The port number is always in
+  /// the host's byte order.
+  void port(unsigned short port_num)
+  {
+    if (is_v4())
+    {
+      data_.v4.sin_port
+        = asio::detail::socket_ops::host_to_network_short(port_num);
+    }
+    else
+    {
+      data_.v6.sin6_port
+        = asio::detail::socket_ops::host_to_network_short(port_num);
+    }
+  }
+
+  /// Get the IP address associated with the endpoint.
+  asio::ip::address address() const
+  {
+    using namespace std; // For memcpy.
+    if (is_v4())
+    {
+      return asio::ip::address_v4(
+          asio::detail::socket_ops::network_to_host_long(
+            data_.v4.sin_addr.s_addr));
+    }
+    else
+    {
+      asio::ip::address_v6::bytes_type bytes;
+      memcpy(bytes.elems, data_.v6.sin6_addr.s6_addr, 16);
+      return asio::ip::address_v6(bytes, data_.v6.sin6_scope_id);
+    }
+  }
+
+  /// Set the IP address associated with the endpoint.
+  void address(const asio::ip::address& addr)
+  {
+    basic_endpoint<InternetProtocol> tmp_endpoint(addr, port());
+    data_ = tmp_endpoint.data_;
+  }
+
+  /// Compare two endpoints for equality.
+  friend bool operator==(const basic_endpoint<InternetProtocol>& e1,
+      const basic_endpoint<InternetProtocol>& e2)
+  {
+    return e1.address() == e2.address() && e1.port() == e2.port();
+  }
+
+  /// Compare two endpoints for inequality.
+  friend bool operator!=(const basic_endpoint<InternetProtocol>& e1,
+      const basic_endpoint<InternetProtocol>& e2)
+  {
+    return e1.address() != e2.address() || e1.port() != e2.port();
+  }
+
+  /// Compare endpoints for ordering.
+  friend bool operator<(const basic_endpoint<InternetProtocol>& e1,
+      const basic_endpoint<InternetProtocol>& e2)
+  {
+    if (e1.address() < e2.address())
+      return true;
+    if (e1.address() != e2.address())
+      return false;
+    return e1.port() < e2.port();
+  }
+
+private:
+  // Helper function to determine whether the endpoint is IPv4.
+  bool is_v4() const
+  {
+    return data_.base.sa_family == AF_INET;
+  }
+
+  // The underlying IP socket address.
+  union data_union
+  {
+    asio::detail::socket_addr_type base;
+    asio::detail::sockaddr_storage_type storage;
+    asio::detail::sockaddr_in4_type v4;
+    asio::detail::sockaddr_in6_type v6;
+  } data_;
+};
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Output an endpoint as a string.
+/**
+ * Used to output a human-readable string for a specified endpoint.
+ *
+ * @param os The output stream to which the string will be written.
+ *
+ * @param endpoint The endpoint to be written.
+ *
+ * @return The output stream.
+ *
+ * @relates asio::ip::basic_endpoint
+ */
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+template <typename InternetProtocol>
+std::ostream& operator<<(std::ostream& os,
+    const basic_endpoint<InternetProtocol>& endpoint)
+{
+  const address& addr = endpoint.address();
+  asio::error_code ec;
+  std::string a = addr.to_string(ec);
+  if (ec)
+  {
+    if (os.exceptions() & std::ios::failbit)
+      asio::detail::throw_error(ec);
+    else
+      os.setstate(std::ios_base::failbit);
+  }
+  else
+  {
+    std::ostringstream tmp_os;
+    tmp_os.imbue(std::locale::classic());
+    if (addr.is_v4())
+      tmp_os << a;
+    else
+      tmp_os << '[' << a << ']';
+    tmp_os << ':' << endpoint.port();
+    os << tmp_os.str();
+  }
+  return os;
+}
+#else // BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+template <typename Elem, typename Traits, typename InternetProtocol>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os,
+    const basic_endpoint<InternetProtocol>& endpoint)
+{
+  const address& addr = endpoint.address();
+  asio::error_code ec;
+  std::string a = addr.to_string(ec);
+  if (ec)
+  {
+    if (os.exceptions() & std::ios::failbit)
+      asio::detail::throw_error(ec);
+    else
+      os.setstate(std::ios_base::failbit);
+  }
+  else
+  {
+    std::ostringstream tmp_os;
+    tmp_os.imbue(std::locale::classic());
+    if (addr.is_v4())
+      tmp_os << a;
+    else
+      tmp_os << '[' << a << ']';
+    tmp_os << ':' << endpoint.port();
+    os << tmp_os.str();
+  }
+  return os;
+}
+#endif // BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_BASIC_ENDPOINT_HPP
diff --git a/ext/asio/ip/basic_resolver.hpp b/ext/asio/ip/basic_resolver.hpp
new file mode 100644
index 0000000000..43a37af392
--- /dev/null
+++ b/ext/asio/ip/basic_resolver.hpp
@@ -0,0 +1,248 @@
+//
+// basic_resolver.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_BASIC_RESOLVER_HPP
+#define ASIO_IP_BASIC_RESOLVER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_io_object.hpp"
+#include "asio/error.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/ip/resolver_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Provides endpoint resolution functionality.
+/**
+ * The basic_resolver class template provides the ability to resolve a query
+ * to a list of endpoints.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename InternetProtocol,
+    typename ResolverService = resolver_service<InternetProtocol> >
+class basic_resolver
+  : public basic_io_object<ResolverService>
+{
+public:
+  /// The protocol type.
+  typedef InternetProtocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename InternetProtocol::endpoint endpoint_type;
+
+  /// The query type.
+  typedef basic_resolver_query<InternetProtocol> query;
+
+  /// The iterator type.
+  typedef basic_resolver_iterator<InternetProtocol> iterator;
+
+  /// Constructor.
+  /**
+   * This constructor creates a basic_resolver.
+   *
+   * @param io_service The io_service object that the resolver will use to
+   * dispatch handlers for any asynchronous operations performed on the timer.
+   */
+  explicit basic_resolver(asio::io_service& io_service)
+    : basic_io_object<ResolverService>(io_service)
+  {
+  }
+
+  /// Cancel any asynchronous operations that are waiting on the resolver.
+  /**
+   * This function forces the completion of any pending asynchronous
+   * operations on the host resolver. The handler for each cancelled operation
+   * will be invoked with the asio::error::operation_aborted error code.
+   */
+  void cancel()
+  {
+    return this->service.cancel(this->implementation);
+  }
+
+  /// Perform forward resolution of a query to a list of entries.
+  /**
+   * This function is used to resolve a query into a list of endpoint entries.
+   *
+   * @param q A query object that determines what endpoints will be returned.
+   *
+   * @returns A forward-only iterator that can be used to traverse the list
+   * of endpoint entries.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note A default constructed iterator represents the end of the list.
+   *
+   * A successful call to this function is guaranteed to return at least one
+   * entry.
+   */
+  iterator resolve(const query& q)
+  {
+    asio::error_code ec;
+    iterator i = this->service.resolve(this->implementation, q, ec);
+    asio::detail::throw_error(ec);
+    return i;
+  }
+
+  /// Perform forward resolution of a query to a list of entries.
+  /**
+   * This function is used to resolve a query into a list of endpoint entries.
+   *
+   * @param q A query object that determines what endpoints will be returned.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns A forward-only iterator that can be used to traverse the list
+   * of endpoint entries. Returns a default constructed iterator if an error
+   * occurs.
+   *
+   * @note A default constructed iterator represents the end of the list.
+   *
+   * A successful call to this function is guaranteed to return at least one
+   * entry.
+   */
+  iterator resolve(const query& q, asio::error_code& ec)
+  {
+    return this->service.resolve(this->implementation, q, ec);
+  }
+
+  /// Asynchronously perform forward resolution of a query to a list of entries.
+  /**
+   * This function is used to asynchronously resolve a query into a list of
+   * endpoint entries.
+   *
+   * @param q A query object that determines what endpoints will be returned.
+   *
+   * @param handler The handler to be called when the resolve operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   resolver::iterator iterator             // Forward-only iterator that can
+   *                                           // be used to traverse the list
+   *                                           // of endpoint entries.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note A default constructed iterator represents the end of the list.
+   *
+   * A successful resolve operation is guaranteed to pass at least one entry to
+   * the handler.
+   */
+  template <typename ResolveHandler>
+  void async_resolve(const query& q, ResolveHandler handler)
+  {
+    return this->service.async_resolve(this->implementation, q, handler);
+  }
+
+  /// Perform reverse resolution of an endpoint to a list of entries.
+  /**
+   * This function is used to resolve an endpoint into a list of endpoint
+   * entries.
+   *
+   * @param e An endpoint object that determines what endpoints will be
+   * returned.
+   *
+   * @returns A forward-only iterator that can be used to traverse the list
+   * of endpoint entries.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note A default constructed iterator represents the end of the list.
+   *
+   * A successful call to this function is guaranteed to return at least one
+   * entry.
+   */
+  iterator resolve(const endpoint_type& e)
+  {
+    asio::error_code ec;
+    iterator i = this->service.resolve(this->implementation, e, ec);
+    asio::detail::throw_error(ec);
+    return i;
+  }
+
+  /// Perform reverse resolution of an endpoint to a list of entries.
+  /**
+   * This function is used to resolve an endpoint into a list of endpoint
+   * entries.
+   *
+   * @param e An endpoint object that determines what endpoints will be
+   * returned.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns A forward-only iterator that can be used to traverse the list
+   * of endpoint entries. Returns a default constructed iterator if an error
+   * occurs.
+   *
+   * @note A default constructed iterator represents the end of the list.
+   *
+   * A successful call to this function is guaranteed to return at least one
+   * entry.
+   */
+  iterator resolve(const endpoint_type& e, asio::error_code& ec)
+  {
+    return this->service.resolve(this->implementation, e, ec);
+  }
+
+  /// Asynchronously perform reverse resolution of an endpoint to a list of
+  /// entries.
+  /**
+   * This function is used to asynchronously resolve an endpoint into a list of
+   * endpoint entries.
+   *
+   * @param e An endpoint object that determines what endpoints will be
+   * returned.
+   *
+   * @param handler The handler to be called when the resolve operation
+   * completes. Copies will be made of the handler as required. The function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   resolver::iterator iterator             // Forward-only iterator that can
+   *                                           // be used to traverse the list
+   *                                           // of endpoint entries.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note A default constructed iterator represents the end of the list.
+   *
+   * A successful resolve operation is guaranteed to pass at least one entry to
+   * the handler.
+   */
+  template <typename ResolveHandler>
+  void async_resolve(const endpoint_type& e, ResolveHandler handler)
+  {
+    return this->service.async_resolve(this->implementation, e, handler);
+  }
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_BASIC_RESOLVER_HPP
diff --git a/ext/asio/ip/basic_resolver_entry.hpp b/ext/asio/ip/basic_resolver_entry.hpp
new file mode 100644
index 0000000000..09b144b117
--- /dev/null
+++ b/ext/asio/ip/basic_resolver_entry.hpp
@@ -0,0 +1,95 @@
+//
+// basic_resolver_entry.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_BASIC_RESOLVER_ENTRY_HPP
+#define ASIO_IP_BASIC_RESOLVER_ENTRY_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace ip {
+
+/// An entry produced by a resolver.
+/**
+ * The asio::ip::basic_resolver_entry class template describes an entry
+ * as returned by a resolver.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename InternetProtocol>
+class basic_resolver_entry
+{
+public:
+  /// The protocol type associated with the endpoint entry.
+  typedef InternetProtocol protocol_type;
+
+  /// The endpoint type associated with the endpoint entry.
+  typedef typename InternetProtocol::endpoint endpoint_type;
+
+  /// Default constructor.
+  basic_resolver_entry()
+  {
+  }
+
+  /// Construct with specified endpoint, host name and service name.
+  basic_resolver_entry(const endpoint_type& endpoint,
+      const std::string& host_name, const std::string& service_name)
+    : endpoint_(endpoint),
+      host_name_(host_name),
+      service_name_(service_name)
+  {
+  }
+
+  /// Get the endpoint associated with the entry.
+  endpoint_type endpoint() const
+  {
+    return endpoint_;
+  }
+
+  /// Convert to the endpoint associated with the entry.
+  operator endpoint_type() const
+  {
+    return endpoint_;
+  }
+
+  /// Get the host name associated with the entry.
+  std::string host_name() const
+  {
+    return host_name_;
+  }
+
+  /// Get the service name associated with the entry.
+  std::string service_name() const
+  {
+    return service_name_;
+  }
+
+private:
+  endpoint_type endpoint_;
+  std::string host_name_;
+  std::string service_name_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_BASIC_RESOLVER_ENTRY_HPP
diff --git a/ext/asio/ip/basic_resolver_iterator.hpp b/ext/asio/ip/basic_resolver_iterator.hpp
new file mode 100644
index 0000000000..1982d62512
--- /dev/null
+++ b/ext/asio/ip/basic_resolver_iterator.hpp
@@ -0,0 +1,188 @@
+//
+// basic_resolver_iterator.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP
+#define ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/iterator.hpp>
+#include <boost/shared_ptr.hpp>
+#include <cstring>
+#include <string>
+#include <vector>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/ip/basic_resolver_entry.hpp"
+
+namespace asio {
+namespace ip {
+
+/// An iterator over the entries produced by a resolver.
+/**
+ * The asio::ip::basic_resolver_iterator class template is used to define
+ * iterators over the results returned by a resolver.
+ *
+ * The iterator's value_type, obtained when the iterator is dereferenced, is:
+ * @code const basic_resolver_entry<InternetProtocol> @endcode
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename InternetProtocol>
+class basic_resolver_iterator
+#if defined(GENERATING_DOCUMENTATION)
+  : public std::iterator<
+#else // defined(GENERATING_DOCUMENTATION)
+  : public boost::iterator<
+#endif // defined(GENERATING_DOCUMENTATION)
+      std::forward_iterator_tag,
+      const basic_resolver_entry<InternetProtocol> >
+{
+public:
+  /// Default constructor creates an end iterator.
+  basic_resolver_iterator()
+    : index_(0)
+  {
+  }
+
+  /// Create an iterator from an addrinfo list returned by getaddrinfo.
+  static basic_resolver_iterator create(
+      asio::detail::addrinfo_type* address_info,
+      const std::string& host_name, const std::string& service_name)
+  {
+    basic_resolver_iterator iter;
+    if (!address_info)
+      return iter;
+
+    std::string actual_host_name = host_name;
+    if (address_info->ai_canonname)
+      actual_host_name = address_info->ai_canonname;
+
+    iter.values_.reset(new values_type);
+
+    while (address_info)
+    {
+      if (address_info->ai_family == PF_INET
+          || address_info->ai_family == PF_INET6)
+      {
+        using namespace std; // For memcpy.
+        typename InternetProtocol::endpoint endpoint;
+        endpoint.resize(static_cast<std::size_t>(address_info->ai_addrlen));
+        memcpy(endpoint.data(), address_info->ai_addr,
+            address_info->ai_addrlen);
+        iter.values_->push_back(
+            basic_resolver_entry<InternetProtocol>(endpoint,
+              actual_host_name, service_name));
+      }
+      address_info = address_info->ai_next;
+    }
+
+    return iter;
+  }
+
+  /// Create an iterator from an endpoint, host name and service name.
+  static basic_resolver_iterator create(
+      const typename InternetProtocol::endpoint& endpoint,
+      const std::string& host_name, const std::string& service_name)
+  {
+    basic_resolver_iterator iter;
+    iter.values_.reset(new values_type);
+    iter.values_->push_back(
+        basic_resolver_entry<InternetProtocol>(
+          endpoint, host_name, service_name));
+    return iter;
+  }
+
+  /// Dereference an iterator.
+  const basic_resolver_entry<InternetProtocol>& operator*() const
+  {
+    return dereference();
+  }
+
+  /// Dereference an iterator.
+  const basic_resolver_entry<InternetProtocol>* operator->() const
+  {
+    return &dereference();
+  }
+
+  /// Increment operator (prefix).
+  basic_resolver_iterator& operator++()
+  {
+    increment();
+    return *this;
+  }
+
+  /// Increment operator (postfix).
+  basic_resolver_iterator operator++(int)
+  {
+    basic_resolver_iterator tmp(*this);
+    ++*this;
+    return tmp;
+  }
+
+  /// Test two iterators for equality.
+  friend bool operator==(const basic_resolver_iterator& a,
+      const basic_resolver_iterator& b)
+  {
+    return a.equal(b);
+  }
+
+  /// Test two iterators for inequality.
+  friend bool operator!=(const basic_resolver_iterator& a,
+      const basic_resolver_iterator& b)
+  {
+    return !a.equal(b);
+  }
+
+private:
+  void increment()
+  {
+    if (++index_ == values_->size())
+    {
+      // Reset state to match a default constructed end iterator.
+      values_.reset();
+      index_ = 0;
+    }
+  }
+
+  bool equal(const basic_resolver_iterator& other) const
+  {
+    if (!values_ && !other.values_)
+      return true;
+    if (values_ != other.values_)
+      return false;
+    return index_ == other.index_;
+  }
+
+  const basic_resolver_entry<InternetProtocol>& dereference() const
+  {
+    return (*values_)[index_];
+  }
+
+  typedef std::vector<basic_resolver_entry<InternetProtocol> > values_type;
+  boost::shared_ptr<values_type> values_;
+  std::size_t index_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP
diff --git a/ext/asio/ip/basic_resolver_query.hpp b/ext/asio/ip/basic_resolver_query.hpp
new file mode 100644
index 0000000000..3cbb335ca5
--- /dev/null
+++ b/ext/asio/ip/basic_resolver_query.hpp
@@ -0,0 +1,248 @@
+//
+// basic_resolver_query.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_BASIC_RESOLVER_QUERY_HPP
+#define ASIO_IP_BASIC_RESOLVER_QUERY_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/socket_ops.hpp"
+#include "asio/ip/resolver_query_base.hpp"
+
+namespace asio {
+namespace ip {
+
+/// An query to be passed to a resolver.
+/**
+ * The asio::ip::basic_resolver_query class template describes a query
+ * that can be passed to a resolver.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename InternetProtocol>
+class basic_resolver_query
+  : public resolver_query_base
+{
+public:
+  /// The protocol type associated with the endpoint query.
+  typedef InternetProtocol protocol_type;
+
+  /// Construct with specified service name for any protocol.
+  /**
+   * This constructor is typically used to perform name resolution for local
+   * service binding.
+   *
+   * @param service_name A string identifying the requested service. This may
+   * be a descriptive name or a numeric string corresponding to a port number.
+   *
+   * @param resolve_flags A set of flags that determine how name resolution
+   * should be performed. The default flags are suitable for local service
+   * binding.
+   *
+   * @note On POSIX systems, service names are typically defined in the file
+   * <tt>/etc/services</tt>. On Windows, service names may be found in the file
+   * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems
+   * may use additional locations when resolving service names.
+   */
+  basic_resolver_query(const std::string& service_name,
+      resolver_query_base::flags resolve_flags = passive | address_configured)
+    : hints_(),
+      host_name_(),
+      service_name_(service_name)
+  {
+    typename InternetProtocol::endpoint endpoint;
+    hints_.ai_flags = static_cast<int>(resolve_flags);
+    hints_.ai_family = PF_UNSPEC;
+    hints_.ai_socktype = endpoint.protocol().type();
+    hints_.ai_protocol = endpoint.protocol().protocol();
+    hints_.ai_addrlen = 0;
+    hints_.ai_canonname = 0;
+    hints_.ai_addr = 0;
+    hints_.ai_next = 0;
+  }
+
+  /// Construct with specified service name for a given protocol.
+  /**
+   * This constructor is typically used to perform name resolution for local
+   * service binding with a specific protocol version.
+   *
+   * @param protocol A protocol object, normally representing either the IPv4 or
+   * IPv6 version of an internet protocol.
+   *
+   * @param service_name A string identifying the requested service. This may
+   * be a descriptive name or a numeric string corresponding to a port number.
+   *
+   * @param resolve_flags A set of flags that determine how name resolution
+   * should be performed. The default flags are suitable for local service
+   * binding.
+   *
+   * @note On POSIX systems, service names are typically defined in the file
+   * <tt>/etc/services</tt>. On Windows, service names may be found in the file
+   * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems
+   * may use additional locations when resolving service names.
+   */
+  basic_resolver_query(const protocol_type& protocol,
+      const std::string& service_name,
+      resolver_query_base::flags resolve_flags = passive | address_configured)
+    : hints_(),
+      host_name_(),
+      service_name_(service_name)
+  {
+    hints_.ai_flags = static_cast<int>(resolve_flags);
+    hints_.ai_family = protocol.family();
+    hints_.ai_socktype = protocol.type();
+    hints_.ai_protocol = protocol.protocol();
+    hints_.ai_addrlen = 0;
+    hints_.ai_canonname = 0;
+    hints_.ai_addr = 0;
+    hints_.ai_next = 0;
+  }
+
+  /// Construct with specified host name and service name for any protocol.
+  /**
+   * This constructor is typically used to perform name resolution for
+   * communication with remote hosts.
+   *
+   * @param host_name A string identifying a location. May be a descriptive name
+   * or a numeric address string. If an empty string and the passive flag has
+   * been specified, the resolved endpoints are suitable for local service
+   * binding. If an empty string and passive is not specified, the resolved
+   * endpoints will use the loopback address.
+   *
+   * @param service_name A string identifying the requested service. This may
+   * be a descriptive name or a numeric string corresponding to a port number.
+   * May be an empty string, in which case all resolved endpoints will have a
+   * port number of 0.
+   *
+   * @param resolve_flags A set of flags that determine how name resolution
+   * should be performed. The default flags are suitable for communication with
+   * remote hosts.
+   *
+   * @note On POSIX systems, host names may be locally defined in the file
+   * <tt>/etc/hosts</tt>. On Windows, host names may be defined in the file
+   * <tt>c:\\windows\\system32\\drivers\\etc\\hosts</tt>. Remote host name
+   * resolution is performed using DNS. Operating systems may use additional
+   * locations when resolving host names (such as NETBIOS names on Windows).
+   *
+   * On POSIX systems, service names are typically defined in the file
+   * <tt>/etc/services</tt>. On Windows, service names may be found in the file
+   * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems
+   * may use additional locations when resolving service names.
+   */
+  basic_resolver_query(const std::string& host_name,
+      const std::string& service_name,
+      resolver_query_base::flags resolve_flags = address_configured)
+    : hints_(),
+      host_name_(host_name),
+      service_name_(service_name)
+  {
+    typename InternetProtocol::endpoint endpoint;
+    hints_.ai_flags = static_cast<int>(resolve_flags);
+    hints_.ai_family = PF_UNSPEC;
+    hints_.ai_socktype = endpoint.protocol().type();
+    hints_.ai_protocol = endpoint.protocol().protocol();
+    hints_.ai_addrlen = 0;
+    hints_.ai_canonname = 0;
+    hints_.ai_addr = 0;
+    hints_.ai_next = 0;
+  }
+
+  /// Construct with specified host name and service name for a given protocol.
+  /**
+   * This constructor is typically used to perform name resolution for
+   * communication with remote hosts.
+   *
+   * @param protocol A protocol object, normally representing either the IPv4 or
+   * IPv6 version of an internet protocol.
+   *
+   * @param host_name A string identifying a location. May be a descriptive name
+   * or a numeric address string. If an empty string and the passive flag has
+   * been specified, the resolved endpoints are suitable for local service
+   * binding. If an empty string and passive is not specified, the resolved
+   * endpoints will use the loopback address.
+   *
+   * @param service_name A string identifying the requested service. This may
+   * be a descriptive name or a numeric string corresponding to a port number.
+   * May be an empty string, in which case all resolved endpoints will have a
+   * port number of 0.
+   *
+   * @param resolve_flags A set of flags that determine how name resolution
+   * should be performed. The default flags are suitable for communication with
+   * remote hosts.
+   *
+   * @note On POSIX systems, host names may be locally defined in the file
+   * <tt>/etc/hosts</tt>. On Windows, host names may be defined in the file
+   * <tt>c:\\windows\\system32\\drivers\\etc\\hosts</tt>. Remote host name
+   * resolution is performed using DNS. Operating systems may use additional
+   * locations when resolving host names (such as NETBIOS names on Windows).
+   *
+   * On POSIX systems, service names are typically defined in the file
+   * <tt>/etc/services</tt>. On Windows, service names may be found in the file
+   * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems
+   * may use additional locations when resolving service names.
+   */
+  basic_resolver_query(const protocol_type& protocol,
+      const std::string& host_name, const std::string& service_name,
+      resolver_query_base::flags resolve_flags = address_configured)
+    : hints_(),
+      host_name_(host_name),
+      service_name_(service_name)
+  {
+    hints_.ai_flags = static_cast<int>(resolve_flags);
+    hints_.ai_family = protocol.family();
+    hints_.ai_socktype = protocol.type();
+    hints_.ai_protocol = protocol.protocol();
+    hints_.ai_addrlen = 0;
+    hints_.ai_canonname = 0;
+    hints_.ai_addr = 0;
+    hints_.ai_next = 0;
+  }
+
+  /// Get the hints associated with the query.
+  const asio::detail::addrinfo_type& hints() const
+  {
+    return hints_;
+  }
+
+  /// Get the host name associated with the query.
+  std::string host_name() const
+  {
+    return host_name_;
+  }
+
+  /// Get the service name associated with the query.
+  std::string service_name() const
+  {
+    return service_name_;
+  }
+
+private:
+  asio::detail::addrinfo_type hints_;
+  std::string host_name_;
+  std::string service_name_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_BASIC_RESOLVER_QUERY_HPP
diff --git a/ext/asio/ip/detail/socket_option.hpp b/ext/asio/ip/detail/socket_option.hpp
new file mode 100644
index 0000000000..00045f86d5
--- /dev/null
+++ b/ext/asio/ip/detail/socket_option.hpp
@@ -0,0 +1,594 @@
+//
+// socket_option.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_DETAIL_SOCKET_OPTION_HPP
+#define ASIO_IP_DETAIL_SOCKET_OPTION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <cstring>
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ip/address.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace ip {
+namespace detail {
+namespace socket_option {
+
+// Helper template for implementing multicast enable loopback options.
+template <int IPv4_Level, int IPv4_Name, int IPv6_Level, int IPv6_Name>
+class multicast_enable_loopback
+{
+public:
+#if defined(__sun) || defined(__osf__)
+  typedef unsigned char ipv4_value_type;
+  typedef unsigned char ipv6_value_type;
+#elif defined(_AIX) || defined(__hpux) || defined(__QNXNTO__) 
+  typedef unsigned char ipv4_value_type;
+  typedef unsigned int ipv6_value_type;
+#else
+  typedef int ipv4_value_type;
+  typedef int ipv6_value_type;
+#endif
+
+  // Default constructor.
+  multicast_enable_loopback()
+    : ipv4_value_(0),
+      ipv6_value_(0)
+  {
+  }
+
+  // Construct with a specific option value.
+  explicit multicast_enable_loopback(bool v)
+    : ipv4_value_(v ? 1 : 0),
+      ipv6_value_(v ? 1 : 0)
+  {
+  }
+
+  // Set the value of the boolean.
+  multicast_enable_loopback& operator=(bool v)
+  {
+    ipv4_value_ = v ? 1 : 0;
+    ipv6_value_ = v ? 1 : 0;
+    return *this;
+  }
+
+  // Get the current value of the boolean.
+  bool value() const
+  {
+    return !!ipv4_value_;
+  }
+
+  // Convert to bool.
+  operator bool() const
+  {
+    return !!ipv4_value_;
+  }
+
+  // Test for false.
+  bool operator!() const
+  {
+    return !ipv4_value_;
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Level;
+    return IPv4_Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Name;
+    return IPv4_Name;
+  }
+
+  // Get the address of the boolean data.
+  template <typename Protocol>
+  void* data(const Protocol& protocol)
+  {
+    if (protocol.family() == PF_INET6)
+      return &ipv6_value_;
+    return &ipv4_value_;
+  }
+
+  // Get the address of the boolean data.
+  template <typename Protocol>
+  const void* data(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return &ipv6_value_;
+    return &ipv4_value_;
+  }
+
+  // Get the size of the boolean data.
+  template <typename Protocol>
+  std::size_t size(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return sizeof(ipv6_value_);
+    return sizeof(ipv4_value_);
+  }
+
+  // Set the size of the boolean data.
+  template <typename Protocol>
+  void resize(const Protocol& protocol, std::size_t s)
+  {
+    if (protocol.family() == PF_INET6)
+    {
+      if (s != sizeof(ipv6_value_))
+      {
+        std::length_error ex("multicast_enable_loopback socket option resize");
+        boost::throw_exception(ex);
+      }
+      ipv4_value_ = ipv6_value_ ? 1 : 0;
+    }
+    else
+    {
+      if (s != sizeof(ipv4_value_))
+      {
+        std::length_error ex("multicast_enable_loopback socket option resize");
+        boost::throw_exception(ex);
+      }
+      ipv6_value_ = ipv4_value_ ? 1 : 0;
+    }
+  }
+
+private:
+  ipv4_value_type ipv4_value_;
+  ipv6_value_type ipv6_value_;
+};
+
+// Helper template for implementing unicast hops options.
+template <int IPv4_Level, int IPv4_Name, int IPv6_Level, int IPv6_Name>
+class unicast_hops
+{
+public:
+  // Default constructor.
+  unicast_hops()
+    : value_(0)
+  {
+  }
+
+  // Construct with a specific option value.
+  explicit unicast_hops(int v)
+    : value_(v)
+  {
+  }
+
+  // Set the value of the option.
+  unicast_hops& operator=(int v)
+  {
+    value_ = v;
+    return *this;
+  }
+
+  // Get the current value of the option.
+  int value() const
+  {
+    return value_;
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Level;
+    return IPv4_Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Name;
+    return IPv4_Name;
+  }
+
+  // Get the address of the data.
+  template <typename Protocol>
+  int* data(const Protocol&)
+  {
+    return &value_;
+  }
+
+  // Get the address of the data.
+  template <typename Protocol>
+  const int* data(const Protocol&) const
+  {
+    return &value_;
+  }
+
+  // Get the size of the data.
+  template <typename Protocol>
+  std::size_t size(const Protocol&) const
+  {
+    return sizeof(value_);
+  }
+
+  // Set the size of the data.
+  template <typename Protocol>
+  void resize(const Protocol&, std::size_t s)
+  {
+    if (s != sizeof(value_))
+    {
+      std::length_error ex("unicast hops socket option resize");
+      boost::throw_exception(ex);
+    }
+#if defined(__hpux)
+    if (value_ < 0)
+      value_ = value_ & 0xFF;
+#endif
+  }
+
+private:
+  int value_;
+};
+
+// Helper template for implementing multicast hops options.
+template <int IPv4_Level, int IPv4_Name, int IPv6_Level, int IPv6_Name>
+class multicast_hops
+{
+public:
+#if defined(BOOST_WINDOWS) && defined(UNDER_CE)
+  typedef int ipv4_value_type;
+#else
+  typedef unsigned char ipv4_value_type;
+#endif
+  typedef int ipv6_value_type;
+
+  // Default constructor.
+  multicast_hops()
+    : ipv4_value_(0),
+      ipv6_value_(0)
+  {
+  }
+
+  // Construct with a specific option value.
+  explicit multicast_hops(int v)
+  {
+    if (v < 0 || v > 255)
+    {
+      std::out_of_range ex("multicast hops value out of range");
+      boost::throw_exception(ex);
+    }
+    ipv4_value_ = (ipv4_value_type)v;
+    ipv6_value_ = v;
+  }
+
+  // Set the value of the option.
+  multicast_hops& operator=(int v)
+  {
+    if (v < 0 || v > 255)
+    {
+      std::out_of_range ex("multicast hops value out of range");
+      boost::throw_exception(ex);
+    }
+    ipv4_value_ = (ipv4_value_type)v;
+    ipv6_value_ = v;
+    return *this;
+  }
+
+  // Get the current value of the option.
+  int value() const
+  {
+    return ipv6_value_;
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Level;
+    return IPv4_Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Name;
+    return IPv4_Name;
+  }
+
+  // Get the address of the data.
+  template <typename Protocol>
+  void* data(const Protocol& protocol)
+  {
+    if (protocol.family() == PF_INET6)
+      return &ipv6_value_;
+    return &ipv4_value_;
+  }
+
+  // Get the address of the data.
+  template <typename Protocol>
+  const void* data(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return &ipv6_value_;
+    return &ipv4_value_;
+  }
+
+  // Get the size of the data.
+  template <typename Protocol>
+  std::size_t size(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return sizeof(ipv6_value_);
+    return sizeof(ipv4_value_);
+  }
+
+  // Set the size of the data.
+  template <typename Protocol>
+  void resize(const Protocol& protocol, std::size_t s)
+  {
+    if (protocol.family() == PF_INET6)
+    {
+      if (s != sizeof(ipv6_value_))
+      {
+        std::length_error ex("multicast hops socket option resize");
+        boost::throw_exception(ex);
+      }
+      if (ipv6_value_ < 0)
+        ipv4_value_ = 0;
+      else if (ipv6_value_ > 255)
+        ipv4_value_ = 255;
+      else
+        ipv4_value_ = (ipv4_value_type)ipv6_value_;
+    }
+    else
+    {
+      if (s != sizeof(ipv4_value_))
+      {
+        std::length_error ex("multicast hops socket option resize");
+        boost::throw_exception(ex);
+      }
+      ipv6_value_ = ipv4_value_;
+    }
+  }
+
+private:
+  ipv4_value_type ipv4_value_;
+  ipv6_value_type ipv6_value_;
+};
+
+// Helper template for implementing ip_mreq-based options.
+template <int IPv4_Level, int IPv4_Name, int IPv6_Level, int IPv6_Name>
+class multicast_request
+{
+public:
+  // Default constructor.
+  multicast_request()
+  {
+    ipv4_value_.imr_multiaddr.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          asio::ip::address_v4::any().to_ulong());
+    ipv4_value_.imr_interface.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          asio::ip::address_v4::any().to_ulong());
+
+    asio::detail::in6_addr_type tmp_addr = IN6ADDR_ANY_INIT;
+    ipv6_value_.ipv6mr_multiaddr = tmp_addr;
+    ipv6_value_.ipv6mr_interface = 0;
+  }
+
+  // Construct with multicast address only.
+  explicit multicast_request(const asio::ip::address& multicast_address)
+  {
+    if (multicast_address.is_v6())
+    {
+      ipv4_value_.imr_multiaddr.s_addr =
+        asio::detail::socket_ops::host_to_network_long(
+            asio::ip::address_v4::any().to_ulong());
+      ipv4_value_.imr_interface.s_addr =
+        asio::detail::socket_ops::host_to_network_long(
+            asio::ip::address_v4::any().to_ulong());
+
+      using namespace std; // For memcpy.
+      asio::ip::address_v6 ipv6_address = multicast_address.to_v6();
+      asio::ip::address_v6::bytes_type bytes = ipv6_address.to_bytes();
+      memcpy(ipv6_value_.ipv6mr_multiaddr.s6_addr, bytes.elems, 16);
+      ipv6_value_.ipv6mr_interface = 0;
+    }
+    else
+    {
+      ipv4_value_.imr_multiaddr.s_addr =
+        asio::detail::socket_ops::host_to_network_long(
+            multicast_address.to_v4().to_ulong());
+      ipv4_value_.imr_interface.s_addr =
+        asio::detail::socket_ops::host_to_network_long(
+            asio::ip::address_v4::any().to_ulong());
+
+      asio::detail::in6_addr_type tmp_addr = IN6ADDR_ANY_INIT;
+      ipv6_value_.ipv6mr_multiaddr = tmp_addr;
+      ipv6_value_.ipv6mr_interface = 0;
+    }
+  }
+
+  // Construct with multicast address and IPv4 address specifying an interface.
+  explicit multicast_request(
+      const asio::ip::address_v4& multicast_address,
+      const asio::ip::address_v4& network_interface
+        = asio::ip::address_v4::any())
+  {
+    ipv4_value_.imr_multiaddr.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          multicast_address.to_ulong());
+    ipv4_value_.imr_interface.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          network_interface.to_ulong());
+
+    asio::detail::in6_addr_type tmp_addr = IN6ADDR_ANY_INIT;
+    ipv6_value_.ipv6mr_multiaddr = tmp_addr;
+    ipv6_value_.ipv6mr_interface = 0;
+  }
+
+  // Construct with multicast address and IPv6 network interface index.
+  explicit multicast_request(
+      const asio::ip::address_v6& multicast_address,
+      unsigned long network_interface = 0)
+  {
+    ipv4_value_.imr_multiaddr.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          asio::ip::address_v4::any().to_ulong());
+    ipv4_value_.imr_interface.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          asio::ip::address_v4::any().to_ulong());
+
+    using namespace std; // For memcpy.
+    asio::ip::address_v6::bytes_type bytes =
+      multicast_address.to_bytes();
+    memcpy(ipv6_value_.ipv6mr_multiaddr.s6_addr, bytes.elems, 16);
+    ipv6_value_.ipv6mr_interface = network_interface;
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Level;
+    return IPv4_Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Name;
+    return IPv4_Name;
+  }
+
+  // Get the address of the option data.
+  template <typename Protocol>
+  const void* data(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return &ipv6_value_;
+    return &ipv4_value_;
+  }
+
+  // Get the size of the option data.
+  template <typename Protocol>
+  std::size_t size(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return sizeof(ipv6_value_);
+    return sizeof(ipv4_value_);
+  }
+
+private:
+  asio::detail::in4_mreq_type ipv4_value_;
+  asio::detail::in6_mreq_type ipv6_value_;
+};
+
+// Helper template for implementing options that specify a network interface.
+template <int IPv4_Level, int IPv4_Name, int IPv6_Level, int IPv6_Name>
+class network_interface
+{
+public:
+  // Default constructor.
+  network_interface()
+  {
+    ipv4_value_.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          asio::ip::address_v4::any().to_ulong());
+    ipv6_value_ = 0;
+  }
+
+  // Construct with IPv4 interface.
+  explicit network_interface(const asio::ip::address_v4& ipv4_interface)
+  {
+    ipv4_value_.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          ipv4_interface.to_ulong());
+    ipv6_value_ = 0;
+  }
+
+  // Construct with IPv6 interface.
+  explicit network_interface(unsigned int ipv6_interface)
+  {
+    ipv4_value_.s_addr =
+      asio::detail::socket_ops::host_to_network_long(
+          asio::ip::address_v4::any().to_ulong());
+    ipv6_value_ = ipv6_interface;
+  }
+
+  // Get the level of the socket option.
+  template <typename Protocol>
+  int level(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Level;
+    return IPv4_Level;
+  }
+
+  // Get the name of the socket option.
+  template <typename Protocol>
+  int name(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return IPv6_Name;
+    return IPv4_Name;
+  }
+
+  // Get the address of the option data.
+  template <typename Protocol>
+  const void* data(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return &ipv6_value_;
+    return &ipv4_value_;
+  }
+
+  // Get the size of the option data.
+  template <typename Protocol>
+  std::size_t size(const Protocol& protocol) const
+  {
+    if (protocol.family() == PF_INET6)
+      return sizeof(ipv6_value_);
+    return sizeof(ipv4_value_);
+  }
+
+private:
+  asio::detail::in4_addr_type ipv4_value_;
+  unsigned int ipv6_value_;
+};
+
+} // namespace socket_option
+} // namespace detail
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_DETAIL_SOCKET_OPTION_HPP
diff --git a/ext/asio/ip/host_name.hpp b/ext/asio/ip/host_name.hpp
new file mode 100644
index 0000000000..f24ce1a223
--- /dev/null
+++ b/ext/asio/ip/host_name.hpp
@@ -0,0 +1,62 @@
+//
+// host_name.hpp
+// ~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_HOST_NAME_HPP
+#define ASIO_IP_HOST_NAME_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Get the current host name.
+std::string host_name();
+
+/// Get the current host name.
+std::string host_name(asio::error_code& ec);
+
+inline std::string host_name()
+{
+  char name[1024];
+  asio::error_code ec;
+  if (asio::detail::socket_ops::gethostname(name, sizeof(name), ec) != 0)
+  {
+    asio::detail::throw_error(ec);
+    return std::string();
+  }
+  return std::string(name);
+}
+
+inline std::string host_name(asio::error_code& ec)
+{
+  char name[1024];
+  if (asio::detail::socket_ops::gethostname(name, sizeof(name), ec) != 0)
+    return std::string();
+  return std::string(name);
+}
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_HOST_NAME_HPP
diff --git a/ext/asio/ip/icmp.hpp b/ext/asio/ip/icmp.hpp
new file mode 100644
index 0000000000..d76b4d1a6d
--- /dev/null
+++ b/ext/asio/ip/icmp.hpp
@@ -0,0 +1,118 @@
+//
+// icmp.hpp
+// ~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_ICMP_HPP
+#define ASIO_IP_ICMP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_raw_socket.hpp"
+#include "asio/ip/basic_endpoint.hpp"
+#include "asio/ip/basic_resolver.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Encapsulates the flags needed for ICMP.
+/**
+ * The asio::ip::icmp class contains flags necessary for ICMP sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Protocol, InternetProtocol.
+ */
+class icmp
+{
+public:
+  /// The type of a ICMP endpoint.
+  typedef basic_endpoint<icmp> endpoint;
+
+  /// (Deprecated: use resolver::query.) The type of a resolver query.
+  typedef basic_resolver_query<icmp> resolver_query;
+
+  /// (Deprecated: use resolver::iterator.) The type of a resolver iterator.
+  typedef basic_resolver_iterator<icmp> resolver_iterator;
+
+  /// Construct to represent the IPv4 ICMP protocol.
+  static icmp v4()
+  {
+    return icmp(IPPROTO_ICMP, PF_INET);
+  }
+
+  /// Construct to represent the IPv6 ICMP protocol.
+  static icmp v6()
+  {
+    return icmp(IPPROTO_ICMPV6, PF_INET6);
+  }
+
+  /// Obtain an identifier for the type of the protocol.
+  int type() const
+  {
+    return SOCK_RAW;
+  }
+
+  /// Obtain an identifier for the protocol.
+  int protocol() const
+  {
+    return protocol_;
+  }
+
+  /// Obtain an identifier for the protocol family.
+  int family() const
+  {
+    return family_;
+  }
+
+  /// The ICMP socket type.
+  typedef basic_raw_socket<icmp> socket;
+
+  /// The ICMP resolver type.
+  typedef basic_resolver<icmp> resolver;
+
+  /// Compare two protocols for equality.
+  friend bool operator==(const icmp& p1, const icmp& p2)
+  {
+    return p1.protocol_ == p2.protocol_ && p1.family_ == p2.family_;
+  }
+
+  /// Compare two protocols for inequality.
+  friend bool operator!=(const icmp& p1, const icmp& p2)
+  {
+    return p1.protocol_ != p2.protocol_ || p1.family_ != p2.family_;
+  }
+
+private:
+  // Construct with a specific family.
+  explicit icmp(int protocol, int family)
+    : protocol_(protocol),
+      family_(family)
+  {
+  }
+
+  int protocol_;
+  int family_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_ICMP_HPP
diff --git a/ext/asio/ip/multicast.hpp b/ext/asio/ip/multicast.hpp
new file mode 100644
index 0000000000..eeedc6ce19
--- /dev/null
+++ b/ext/asio/ip/multicast.hpp
@@ -0,0 +1,181 @@
+//
+// multicast.hpp
+// ~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_MULTICAST_HPP
+#define ASIO_IP_MULTICAST_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ip/detail/socket_option.hpp"
+
+namespace asio {
+namespace ip {
+namespace multicast {
+
+/// Socket option to join a multicast group on a specified interface.
+/**
+ * Implements the IPPROTO_IP/IP_ADD_MEMBERSHIP socket option.
+ *
+ * @par Examples
+ * Setting the option to join a multicast group:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::address multicast_address =
+ *   asio::ip::address::from_string("225.0.0.1");
+ * asio::ip::multicast::join_group option(multicast_address);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par Concepts:
+ * SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined join_group;
+#else
+typedef asio::ip::detail::socket_option::multicast_request<
+  IPPROTO_IP, IP_ADD_MEMBERSHIP, IPPROTO_IPV6, IPV6_JOIN_GROUP> join_group;
+#endif
+
+/// Socket option to leave a multicast group on a specified interface.
+/**
+ * Implements the IPPROTO_IP/IP_DROP_MEMBERSHIP socket option.
+ *
+ * @par Examples
+ * Setting the option to leave a multicast group:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::address multicast_address =
+ *   asio::ip::address::from_string("225.0.0.1");
+ * asio::ip::multicast::leave_group option(multicast_address);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par Concepts:
+ * SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined leave_group;
+#else
+typedef asio::ip::detail::socket_option::multicast_request<
+  IPPROTO_IP, IP_DROP_MEMBERSHIP, IPPROTO_IPV6, IPV6_LEAVE_GROUP> leave_group;
+#endif
+
+/// Socket option for local interface to use for outgoing multicast packets.
+/**
+ * Implements the IPPROTO_IP/IP_MULTICAST_IF socket option.
+ *
+ * @par Examples
+ * Setting the option:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::address_v4 local_interface =
+ *   asio::ip::address_v4::from_string("1.2.3.4");
+ * asio::ip::multicast::outbound_interface option(local_interface);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par Concepts:
+ * SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined outbound_interface;
+#else
+typedef asio::ip::detail::socket_option::network_interface<
+  IPPROTO_IP, IP_MULTICAST_IF, IPPROTO_IPV6, IPV6_MULTICAST_IF>
+  outbound_interface;
+#endif
+
+/// Socket option for time-to-live associated with outgoing multicast packets.
+/**
+ * Implements the IPPROTO_IP/IP_MULTICAST_TTL socket option.
+ *
+ * @par Examples
+ * Setting the option:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::multicast::hops option(4);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par
+ * Getting the current option value:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::multicast::hops option;
+ * socket.get_option(option);
+ * int ttl = option.value();
+ * @endcode
+ *
+ * @par Concepts:
+ * GettableSocketOption, SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined hops;
+#else
+typedef asio::ip::detail::socket_option::multicast_hops<
+  IPPROTO_IP, IP_MULTICAST_TTL, IPPROTO_IPV6, IPV6_MULTICAST_HOPS> hops;
+#endif
+
+/// Socket option determining whether outgoing multicast packets will be
+/// received on the same socket if it is a member of the multicast group.
+/**
+ * Implements the IPPROTO_IP/IP_MULTICAST_LOOP socket option.
+ *
+ * @par Examples
+ * Setting the option:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::multicast::enable_loopback option(true);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par
+ * Getting the current option value:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::multicast::enable_loopback option;
+ * socket.get_option(option);
+ * bool is_set = option.value();
+ * @endcode
+ *
+ * @par Concepts:
+ * GettableSocketOption, SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined enable_loopback;
+#else
+typedef asio::ip::detail::socket_option::multicast_enable_loopback<
+  IPPROTO_IP, IP_MULTICAST_LOOP, IPPROTO_IPV6, IPV6_MULTICAST_LOOP>
+  enable_loopback;
+#endif
+
+} // namespace multicast
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_MULTICAST_HPP
diff --git a/ext/asio/ip/resolver_query_base.hpp b/ext/asio/ip/resolver_query_base.hpp
new file mode 100644
index 0000000000..5a0acea8f3
--- /dev/null
+++ b/ext/asio/ip/resolver_query_base.hpp
@@ -0,0 +1,158 @@
+//
+// resolver_query_base.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_RESOLVER_QUERY_BASE_HPP
+#define ASIO_IP_RESOLVER_QUERY_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace ip {
+
+/// The resolver_query_base class is used as a base for the
+/// basic_resolver_query class templates to provide a common place to define
+/// the flag constants.
+class resolver_query_base
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// A bitmask type (C++ Std [lib.bitmask.types]).
+  typedef unspecified flags;
+
+  /// Determine the canonical name of the host specified in the query.
+  static const flags canonical_name = implementation_defined;
+
+  /// Indicate that returned endpoint is intended for use as a locally bound
+  /// socket endpoint.
+  static const flags passive = implementation_defined;
+
+  /// Host name should be treated as a numeric string defining an IPv4 or IPv6
+  /// address and no name resolution should be attempted.
+  static const flags numeric_host = implementation_defined;
+
+  /// Service name should be treated as a numeric string defining a port number
+  /// and no name resolution should be attempted.
+  static const flags numeric_service = implementation_defined;
+
+  /// If the query protocol family is specified as IPv6, return IPv4-mapped
+  /// IPv6 addresses on finding no IPv6 addresses.
+  static const flags v4_mapped = implementation_defined;
+
+  /// If used with v4_mapped, return all matching IPv6 and IPv4 addresses.
+  static const flags all_matching = implementation_defined;
+
+  /// Only return IPv4 addresses if a non-loopback IPv4 address is configured
+  /// for the system. Only return IPv6 addresses if a non-loopback IPv6 address
+  /// is configured for the system.
+  static const flags address_configured = implementation_defined;
+#else
+  enum flags
+  {
+    canonical_name = AI_CANONNAME,
+    passive = AI_PASSIVE,
+    numeric_host = AI_NUMERICHOST,
+# if defined(AI_NUMERICSERV)
+    numeric_service = AI_NUMERICSERV,
+# else
+    numeric_service = 0,
+# endif
+    // Note: QNX Neutrino 6.3 defines AI_V4MAPPED, AI_ALL and AI_ADDRCONFIG but
+    // does not implement them. Therefore they are specifically excluded here.
+# if defined(AI_V4MAPPED) && !defined(__QNXNTO__)
+    v4_mapped = AI_V4MAPPED,
+# else
+    v4_mapped = 0,
+# endif
+# if defined(AI_ALL) && !defined(__QNXNTO__)
+    all_matching = AI_ALL,
+# else
+    all_matching = 0,
+# endif
+# if defined(AI_ADDRCONFIG) && !defined(__QNXNTO__)
+    address_configured = AI_ADDRCONFIG
+# else
+    address_configured = 0
+# endif
+  };
+
+  // Implement bitmask operations as shown in C++ Std [lib.bitmask.types].
+
+  friend flags operator&(flags x, flags y)
+  {
+    return static_cast<flags>(
+        static_cast<unsigned int>(x) & static_cast<unsigned int>(y));
+  }
+
+  friend flags operator|(flags x, flags y)
+  {
+    return static_cast<flags>(
+        static_cast<unsigned int>(x) | static_cast<unsigned int>(y));
+  }
+
+  friend flags operator^(flags x, flags y)
+  {
+    return static_cast<flags>(
+        static_cast<unsigned int>(x) ^ static_cast<unsigned int>(y));
+  }
+
+  friend flags operator~(flags x)
+  {
+    return static_cast<flags>(static_cast<unsigned int>(~x));
+  }
+
+  friend flags& operator&=(flags& x, flags y)
+  {
+    x = x & y;
+    return x;
+  }
+
+  friend flags& operator|=(flags& x, flags y)
+  {
+    x = x | y;
+    return x;
+  }
+
+  friend flags& operator^=(flags& x, flags y)
+  {
+    x = x ^ y;
+    return x;
+  }
+#endif
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~resolver_query_base()
+  {
+  }
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+private:
+  // Workaround to enable the empty base optimisation with Borland C++.
+  char dummy_;
+#endif
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_RESOLVER_QUERY_BASE_HPP
diff --git a/ext/asio/ip/resolver_service.hpp b/ext/asio/ip/resolver_service.hpp
new file mode 100644
index 0000000000..75f6b2c3af
--- /dev/null
+++ b/ext/asio/ip/resolver_service.hpp
@@ -0,0 +1,142 @@
+//
+// resolver_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_RESOLVER_SERVICE_HPP
+#define ASIO_IP_RESOLVER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/detail/resolver_service.hpp"
+#include "asio/detail/service_base.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Default service implementation for a resolver.
+template <typename InternetProtocol>
+class resolver_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<
+      resolver_service<InternetProtocol> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The protocol type.
+  typedef InternetProtocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename InternetProtocol::endpoint endpoint_type;
+
+  /// The query type.
+  typedef basic_resolver_query<InternetProtocol> query_type;
+
+  /// The iterator type.
+  typedef basic_resolver_iterator<InternetProtocol> iterator_type;
+
+private:
+  // The type of the platform-specific implementation.
+  typedef asio::detail::resolver_service<InternetProtocol>
+    service_impl_type;
+
+public:
+  /// The type of a resolver implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// Construct a new resolver service for the specified io_service.
+  explicit resolver_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        resolver_service<InternetProtocol> >(io_service),
+      service_impl_(asio::use_service<service_impl_type>(io_service))
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  /// Construct a new resolver implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a resolver implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Cancel pending asynchronous operations.
+  void cancel(implementation_type& impl)
+  {
+    service_impl_.cancel(impl);
+  }
+
+  /// Resolve a query to a list of entries.
+  iterator_type resolve(implementation_type& impl, const query_type& query,
+      asio::error_code& ec)
+  {
+    return service_impl_.resolve(impl, query, ec);
+  }
+
+  /// Asynchronously resolve a query to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl, const query_type& query,
+      Handler handler)
+  {
+    service_impl_.async_resolve(impl, query, handler);
+  }
+
+  /// Resolve an endpoint to a list of entries.
+  iterator_type resolve(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    return service_impl_.resolve(impl, endpoint, ec);
+  }
+
+  /// Asynchronously resolve an endpoint to a list of entries.
+  template <typename ResolveHandler>
+  void async_resolve(implementation_type& impl, const endpoint_type& endpoint,
+      ResolveHandler handler)
+  {
+    return service_impl_.async_resolve(impl, endpoint, handler);
+  }
+
+private:
+  // The service that provides the platform-specific implementation.
+  service_impl_type& service_impl_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_RESOLVER_SERVICE_HPP
diff --git a/ext/asio/ip/tcp.hpp b/ext/asio/ip/tcp.hpp
new file mode 100644
index 0000000000..a2e9ac9c52
--- /dev/null
+++ b/ext/asio/ip/tcp.hpp
@@ -0,0 +1,160 @@
+//
+// tcp.hpp
+// ~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_TCP_HPP
+#define ASIO_IP_TCP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_socket_acceptor.hpp"
+#include "asio/basic_socket_iostream.hpp"
+#include "asio/basic_stream_socket.hpp"
+#include "asio/ip/basic_endpoint.hpp"
+#include "asio/ip/basic_resolver.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/detail/socket_option.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Encapsulates the flags needed for TCP.
+/**
+ * The asio::ip::tcp class contains flags necessary for TCP sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Protocol, InternetProtocol.
+ */
+class tcp
+{
+public:
+  /// The type of a TCP endpoint.
+  typedef basic_endpoint<tcp> endpoint;
+
+  /// (Deprecated: use resolver::query.) The type of a resolver query.
+  typedef basic_resolver_query<tcp> resolver_query;
+
+  /// (Deprecated: use resolver::iterator.) The type of a resolver iterator.
+  typedef basic_resolver_iterator<tcp> resolver_iterator;
+
+  /// Construct to represent the IPv4 TCP protocol.
+  static tcp v4()
+  {
+    return tcp(PF_INET);
+  }
+
+  /// Construct to represent the IPv6 TCP protocol.
+  static tcp v6()
+  {
+    return tcp(PF_INET6);
+  }
+
+  /// Obtain an identifier for the type of the protocol.
+  int type() const
+  {
+    return SOCK_STREAM;
+  }
+
+  /// Obtain an identifier for the protocol.
+  int protocol() const
+  {
+    return IPPROTO_TCP;
+  }
+
+  /// Obtain an identifier for the protocol family.
+  int family() const
+  {
+    return family_;
+  }
+
+  /// The TCP socket type.
+  typedef basic_stream_socket<tcp> socket;
+
+  /// The TCP acceptor type.
+  typedef basic_socket_acceptor<tcp> acceptor;
+
+  /// The TCP resolver type.
+  typedef basic_resolver<tcp> resolver;
+
+#if !defined(BOOST_NO_IOSTREAM)
+  /// The TCP iostream type.
+  typedef basic_socket_iostream<tcp> iostream;
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+  /// Socket option for disabling the Nagle algorithm.
+  /**
+   * Implements the IPPROTO_TCP/TCP_NODELAY socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::ip::tcp::no_delay option(true);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::ip::tcp::no_delay option;
+   * socket.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined no_delay;
+#else
+  typedef asio::detail::socket_option::boolean<
+    IPPROTO_TCP, TCP_NODELAY> no_delay;
+#endif
+
+  /// Compare two protocols for equality.
+  friend bool operator==(const tcp& p1, const tcp& p2)
+  {
+    return p1.family_ == p2.family_;
+  }
+
+  /// Compare two protocols for inequality.
+  friend bool operator!=(const tcp& p1, const tcp& p2)
+  {
+    return p1.family_ != p2.family_;
+  }
+
+private:
+  // Construct with a specific family.
+  explicit tcp(int family)
+    : family_(family)
+  {
+  }
+
+  int family_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_TCP_HPP
diff --git a/ext/asio/ip/udp.hpp b/ext/asio/ip/udp.hpp
new file mode 100644
index 0000000000..fb261187a8
--- /dev/null
+++ b/ext/asio/ip/udp.hpp
@@ -0,0 +1,116 @@
+//
+// udp.hpp
+// ~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_UDP_HPP
+#define ASIO_IP_UDP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_datagram_socket.hpp"
+#include "asio/ip/basic_endpoint.hpp"
+#include "asio/ip/basic_resolver.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Encapsulates the flags needed for UDP.
+/**
+ * The asio::ip::udp class contains flags necessary for UDP sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Protocol, InternetProtocol.
+ */
+class udp
+{
+public:
+  /// The type of a UDP endpoint.
+  typedef basic_endpoint<udp> endpoint;
+
+  /// (Deprecated: use resolver::query.) The type of a resolver query.
+  typedef basic_resolver_query<udp> resolver_query;
+
+  /// (Deprecated: use resolver::iterator.) The type of a resolver iterator.
+  typedef basic_resolver_iterator<udp> resolver_iterator;
+
+  /// Construct to represent the IPv4 UDP protocol.
+  static udp v4()
+  {
+    return udp(PF_INET);
+  }
+
+  /// Construct to represent the IPv6 UDP protocol.
+  static udp v6()
+  {
+    return udp(PF_INET6);
+  }
+
+  /// Obtain an identifier for the type of the protocol.
+  int type() const
+  {
+    return SOCK_DGRAM;
+  }
+
+  /// Obtain an identifier for the protocol.
+  int protocol() const
+  {
+    return IPPROTO_UDP;
+  }
+
+  /// Obtain an identifier for the protocol family.
+  int family() const
+  {
+    return family_;
+  }
+
+  /// The UDP socket type.
+  typedef basic_datagram_socket<udp> socket;
+
+  /// The UDP resolver type.
+  typedef basic_resolver<udp> resolver;
+
+  /// Compare two protocols for equality.
+  friend bool operator==(const udp& p1, const udp& p2)
+  {
+    return p1.family_ == p2.family_;
+  }
+
+  /// Compare two protocols for inequality.
+  friend bool operator!=(const udp& p1, const udp& p2)
+  {
+    return p1.family_ != p2.family_;
+  }
+
+private:
+  // Construct with a specific family.
+  explicit udp(int family)
+    : family_(family)
+  {
+  }
+
+  int family_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_UDP_HPP
diff --git a/ext/asio/ip/unicast.hpp b/ext/asio/ip/unicast.hpp
new file mode 100644
index 0000000000..46d7239c8e
--- /dev/null
+++ b/ext/asio/ip/unicast.hpp
@@ -0,0 +1,70 @@
+//
+// unicast.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_UNICAST_HPP
+#define ASIO_IP_UNICAST_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ip/detail/socket_option.hpp"
+
+namespace asio {
+namespace ip {
+namespace unicast {
+
+/// Socket option for time-to-live associated with outgoing unicast packets.
+/**
+ * Implements the IPPROTO_IP/IP_UNICAST_TTL socket option.
+ *
+ * @par Examples
+ * Setting the option:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::unicast::hops option(4);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par
+ * Getting the current option value:
+ * @code
+ * asio::ip::udp::socket socket(io_service); 
+ * ...
+ * asio::ip::unicast::hops option;
+ * socket.get_option(option);
+ * int ttl = option.value();
+ * @endcode
+ *
+ * @par Concepts:
+ * GettableSocketOption, SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined hops;
+#else
+typedef asio::ip::detail::socket_option::unicast_hops<
+  IPPROTO_IP, IP_TTL, IPPROTO_IPV6, IPV6_UNICAST_HOPS> hops;
+#endif
+
+} // namespace unicast
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_UNICAST_HPP
diff --git a/ext/asio/ip/v6_only.hpp b/ext/asio/ip/v6_only.hpp
new file mode 100644
index 0000000000..928caff0df
--- /dev/null
+++ b/ext/asio/ip/v6_only.hpp
@@ -0,0 +1,68 @@
+//
+// v6_only.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IP_V6_ONLY_HPP
+#define ASIO_IP_V6_ONLY_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/socket_option.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Socket option for determining whether an IPv6 socket supports IPv6
+/// communication only.
+/**
+ * Implements the IPPROTO_IPV6/IP_V6ONLY socket option.
+ *
+ * @par Examples
+ * Setting the option:
+ * @code
+ * asio::ip::tcp::socket socket(io_service); 
+ * ...
+ * asio::ip::v6_only option(true);
+ * socket.set_option(option);
+ * @endcode
+ *
+ * @par
+ * Getting the current option value:
+ * @code
+ * asio::ip::tcp::socket socket(io_service); 
+ * ...
+ * asio::ip::v6_only option;
+ * socket.get_option(option);
+ * bool v6_only = option.value();
+ * @endcode
+ *
+ * @par Concepts:
+ * GettableSocketOption, SettableSocketOption.
+ */
+#if defined(GENERATING_DOCUMENTATION)
+typedef implementation_defined v6_only;
+#elif defined(IPV6_V6ONLY)
+typedef asio::detail::socket_option::boolean<
+    IPPROTO_IPV6, IPV6_V6ONLY> v6_only;
+#else
+typedef asio::detail::socket_option::boolean<
+    asio::detail::custom_socket_option_level,
+    asio::detail::always_fail_option> v6_only;
+#endif
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_V6_ONLY_HPP
diff --git a/ext/asio/is_read_buffered.hpp b/ext/asio/is_read_buffered.hpp
new file mode 100644
index 0000000000..8d971747a3
--- /dev/null
+++ b/ext/asio/is_read_buffered.hpp
@@ -0,0 +1,62 @@
+//
+// is_read_buffered.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IS_READ_BUFFERED_HPP
+#define ASIO_IS_READ_BUFFERED_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffered_read_stream_fwd.hpp"
+#include "asio/buffered_stream_fwd.hpp"
+
+namespace asio {
+
+namespace detail {
+
+template <typename Stream>
+char is_read_buffered_helper(buffered_stream<Stream>* s);
+
+template <typename Stream>
+char is_read_buffered_helper(buffered_read_stream<Stream>* s);
+
+struct is_read_buffered_big_type { char data[10]; };
+is_read_buffered_big_type is_read_buffered_helper(...);
+
+} // namespace detail
+
+/// The is_read_buffered class is a traits class that may be used to determine
+/// whether a stream type supports buffering of read data.
+template <typename Stream>
+class is_read_buffered
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The value member is true only if the Stream type supports buffering of
+  /// read data.
+  static const bool value;
+#else
+  BOOST_STATIC_CONSTANT(bool,
+      value = sizeof(detail::is_read_buffered_helper((Stream*)0)) == 1);
+#endif
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IS_READ_BUFFERED_HPP
diff --git a/ext/asio/is_write_buffered.hpp b/ext/asio/is_write_buffered.hpp
new file mode 100644
index 0000000000..5d16b1c542
--- /dev/null
+++ b/ext/asio/is_write_buffered.hpp
@@ -0,0 +1,62 @@
+//
+// is_write_buffered.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_IS_WRITE_BUFFERED_HPP
+#define ASIO_IS_WRITE_BUFFERED_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffered_stream_fwd.hpp"
+#include "asio/buffered_write_stream_fwd.hpp"
+
+namespace asio {
+
+namespace detail {
+
+template <typename Stream>
+char is_write_buffered_helper(buffered_stream<Stream>* s);
+
+template <typename Stream>
+char is_write_buffered_helper(buffered_write_stream<Stream>* s);
+
+struct is_write_buffered_big_type { char data[10]; };
+is_write_buffered_big_type is_write_buffered_helper(...);
+
+} // namespace detail
+
+/// The is_write_buffered class is a traits class that may be used to determine
+/// whether a stream type supports buffering of written data.
+template <typename Stream>
+class is_write_buffered
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The value member is true only if the Stream type supports buffering of
+  /// written data.
+  static const bool value;
+#else
+  BOOST_STATIC_CONSTANT(bool,
+      value = sizeof(detail::is_write_buffered_helper((Stream*)0)) == 1);
+#endif
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IS_WRITE_BUFFERED_HPP
diff --git a/ext/asio/local/basic_endpoint.hpp b/ext/asio/local/basic_endpoint.hpp
new file mode 100644
index 0000000000..81e6a7ed57
--- /dev/null
+++ b/ext/asio/local/basic_endpoint.hpp
@@ -0,0 +1,265 @@
+//
+// basic_endpoint.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Derived from a public domain implementation written by Daniel Casimiro.
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_LOCAL_BASIC_ENDPOINT_HPP
+#define ASIO_LOCAL_BASIC_ENDPOINT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/throw_exception.hpp>
+#include <cstddef>
+#include <cstring>
+#include <ostream>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/system_error.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if !defined(ASIO_DISABLE_LOCAL_SOCKETS)
+# if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+#  define ASIO_HAS_LOCAL_SOCKETS 1
+# endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+#endif // !defined(ASIO_DISABLE_LOCAL_SOCKETS)
+
+#if defined(ASIO_HAS_LOCAL_SOCKETS) \
+  || defined(GENERATING_DOCUMENTATION)
+
+
+namespace asio {
+namespace local {
+
+/// Describes an endpoint for a UNIX socket.
+/**
+ * The asio::local::basic_endpoint class template describes an endpoint
+ * that may be associated with a particular UNIX socket.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * Endpoint.
+ */
+template <typename Protocol>
+class basic_endpoint
+{
+public:
+  /// The protocol type associated with the endpoint.
+  typedef Protocol protocol_type;
+
+  /// The type of the endpoint structure. This type is dependent on the
+  /// underlying implementation of the socket layer.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined data_type;
+#else
+  typedef asio::detail::socket_addr_type data_type;
+#endif
+
+  /// Default constructor.
+  basic_endpoint()
+  {
+    init("", 0);
+  }
+
+  /// Construct an endpoint using the specified path name.
+  basic_endpoint(const char* path)
+  {
+    using namespace std; // For strlen.
+    init(path, strlen(path));
+  }
+
+  /// Construct an endpoint using the specified path name.
+  basic_endpoint(const std::string& path)
+  {
+    init(path.data(), path.length());
+  }
+
+  /// Copy constructor.
+  basic_endpoint(const basic_endpoint& other)
+    : data_(other.data_),
+      path_length_(other.path_length_)
+  {
+  }
+
+  /// Assign from another endpoint.
+  basic_endpoint& operator=(const basic_endpoint& other)
+  {
+    data_ = other.data_;
+    path_length_ = other.path_length_;
+    return *this;
+  }
+
+  /// The protocol associated with the endpoint.
+  protocol_type protocol() const
+  {
+    return protocol_type();
+  }
+
+  /// Get the underlying endpoint in the native type.
+  data_type* data()
+  {
+    return &data_.base;
+  }
+
+  /// Get the underlying endpoint in the native type.
+  const data_type* data() const
+  {
+    return &data_.base;
+  }
+
+  /// Get the underlying size of the endpoint in the native type.
+  std::size_t size() const
+  {
+    return path_length_
+      + offsetof(asio::detail::sockaddr_un_type, sun_path);
+  }
+
+  /// Set the underlying size of the endpoint in the native type.
+  void resize(std::size_t size)
+  {
+    if (size > sizeof(asio::detail::sockaddr_un_type))
+    {
+      asio::system_error e(asio::error::invalid_argument);
+      boost::throw_exception(e);
+    }
+    else if (size == 0)
+    {
+      path_length_ = 0;
+    }
+    else
+    {
+      path_length_ = size
+        - offsetof(asio::detail::sockaddr_un_type, sun_path);
+
+      // The path returned by the operating system may be NUL-terminated.
+      if (path_length_ > 0 && data_.local.sun_path[path_length_ - 1] == 0)
+        --path_length_;
+    }
+  }
+
+  /// Get the capacity of the endpoint in the native type.
+  std::size_t capacity() const
+  {
+    return sizeof(asio::detail::sockaddr_un_type);
+  }
+
+  /// Get the path associated with the endpoint.
+  std::string path() const
+  {
+    return std::string(data_.local.sun_path, path_length_);
+  }
+
+  /// Set the path associated with the endpoint.
+  void path(const char* p)
+  {
+    using namespace std; // For strlen.
+    init(p, strlen(p));
+  }
+
+  /// Set the path associated with the endpoint.
+  void path(const std::string& p)
+  {
+    init(p.data(), p.length());
+  }
+
+  /// Compare two endpoints for equality.
+  friend bool operator==(const basic_endpoint<Protocol>& e1,
+      const basic_endpoint<Protocol>& e2)
+  {
+    return e1.path() == e2.path();
+  }
+
+  /// Compare two endpoints for inequality.
+  friend bool operator!=(const basic_endpoint<Protocol>& e1,
+      const basic_endpoint<Protocol>& e2)
+  {
+    return e1.path() != e2.path();
+  }
+
+  /// Compare endpoints for ordering.
+  friend bool operator<(const basic_endpoint<Protocol>& e1,
+      const basic_endpoint<Protocol>& e2)
+  {
+    return e1.path() < e2.path();
+  }
+
+private:
+  // The underlying UNIX socket address.
+  union data_union
+  {
+    asio::detail::socket_addr_type base;
+    asio::detail::sockaddr_un_type local;
+  } data_;
+
+  // The length of the path associated with the endpoint.
+  std::size_t path_length_;
+
+  // Initialise with a specified path.
+  void init(const char* path, std::size_t path_length)
+  {
+    if (path_length > sizeof(data_.local.sun_path) - 1)
+    {
+      // The buffer is not large enough to store this address.
+      asio::error_code ec(asio::error::name_too_long);
+      asio::detail::throw_error(ec);
+    }
+
+    using namespace std; // For memcpy.
+    data_.local = asio::detail::sockaddr_un_type();
+    data_.local.sun_family = AF_UNIX;
+    memcpy(data_.local.sun_path, path, path_length);
+    path_length_ = path_length;
+
+    // NUL-terminate normal path names. Names that start with a NUL are in the
+    // UNIX domain protocol's "abstract namespace" and are not NUL-terminated.
+    if (path_length > 0 && data_.local.sun_path[0] == 0)
+      data_.local.sun_path[path_length] = 0;
+  }
+};
+
+/// Output an endpoint as a string.
+/**
+ * Used to output a human-readable string for a specified endpoint.
+ *
+ * @param os The output stream to which the string will be written.
+ *
+ * @param endpoint The endpoint to be written.
+ *
+ * @return The output stream.
+ *
+ * @relates asio::local::basic_endpoint
+ */
+template <typename Elem, typename Traits, typename Protocol>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os,
+    const basic_endpoint<Protocol>& endpoint)
+{
+  os << endpoint.path();
+  return os;
+}
+
+} // namespace local
+} // namespace asio
+
+#endif // defined(ASIO_HAS_LOCAL_SOCKETS)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_LOCAL_BASIC_ENDPOINT_HPP
diff --git a/ext/asio/local/connect_pair.hpp b/ext/asio/local/connect_pair.hpp
new file mode 100644
index 0000000000..da1d4fc5bd
--- /dev/null
+++ b/ext/asio/local/connect_pair.hpp
@@ -0,0 +1,100 @@
+//
+// connect_pair.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_LOCAL_CONNECT_PAIR_HPP
+#define ASIO_LOCAL_CONNECT_PAIR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_socket.hpp"
+#include "asio/error.hpp"
+#include "asio/local/basic_endpoint.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if defined(ASIO_HAS_LOCAL_SOCKETS) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace local {
+
+/// Create a pair of connected sockets.
+template <typename Protocol, typename SocketService1, typename SocketService2>
+void connect_pair(
+    basic_socket<Protocol, SocketService1>& socket1,
+    basic_socket<Protocol, SocketService2>& socket2);
+
+/// Create a pair of connected sockets.
+template <typename Protocol, typename SocketService1, typename SocketService2>
+asio::error_code connect_pair(
+    basic_socket<Protocol, SocketService1>& socket1,
+    basic_socket<Protocol, SocketService2>& socket2,
+    asio::error_code& ec);
+
+template <typename Protocol, typename SocketService1, typename SocketService2>
+inline void connect_pair(
+    basic_socket<Protocol, SocketService1>& socket1,
+    basic_socket<Protocol, SocketService2>& socket2)
+{
+  asio::error_code ec;
+  connect_pair(socket1, socket2, ec);
+  asio::detail::throw_error(ec);
+}
+
+template <typename Protocol, typename SocketService1, typename SocketService2>
+inline asio::error_code connect_pair(
+    basic_socket<Protocol, SocketService1>& socket1,
+    basic_socket<Protocol, SocketService2>& socket2,
+    asio::error_code& ec)
+{
+  // Check that this function is only being used with a UNIX domain socket.
+  asio::local::basic_endpoint<Protocol>* tmp
+    = static_cast<typename Protocol::endpoint*>(0);
+  (void)tmp;
+
+  Protocol protocol;
+  asio::detail::socket_type sv[2];
+  if (asio::detail::socket_ops::socketpair(protocol.family(),
+        protocol.type(), protocol.protocol(), sv, ec)
+      == asio::detail::socket_error_retval)
+    return ec;
+
+  if (socket1.assign(protocol, sv[0], ec))
+  {
+    asio::error_code temp_ec;
+    asio::detail::socket_ops::close(sv[0], temp_ec);
+    asio::detail::socket_ops::close(sv[1], temp_ec);
+    return ec;
+  }
+
+  if (socket2.assign(protocol, sv[1], ec))
+  {
+    asio::error_code temp_ec;
+    socket1.close(temp_ec);
+    asio::detail::socket_ops::close(sv[1], temp_ec);
+    return ec;
+  }
+
+  return ec;
+}
+
+} // namespace local
+} // namespace asio
+
+#endif // defined(ASIO_HAS_LOCAL_SOCKETS)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_LOCAL_CONNECT_PAIR_HPP
diff --git a/ext/asio/local/datagram_protocol.hpp b/ext/asio/local/datagram_protocol.hpp
new file mode 100644
index 0000000000..0340180545
--- /dev/null
+++ b/ext/asio/local/datagram_protocol.hpp
@@ -0,0 +1,78 @@
+//
+// datagram_protocol.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_LOCAL_DATAGRAM_PROTOCOL_HPP
+#define ASIO_LOCAL_DATAGRAM_PROTOCOL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_datagram_socket.hpp"
+#include "asio/local/basic_endpoint.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#if defined(ASIO_HAS_LOCAL_SOCKETS) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace local {
+
+/// Encapsulates the flags needed for datagram-oriented UNIX sockets.
+/**
+ * The asio::local::datagram_protocol class contains flags necessary for
+ * datagram-oriented UNIX domain sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Protocol.
+ */
+class datagram_protocol
+{
+public:
+  /// Obtain an identifier for the type of the protocol.
+  int type() const
+  {
+    return SOCK_DGRAM;
+  }
+
+  /// Obtain an identifier for the protocol.
+  int protocol() const
+  {
+    return 0;
+  }
+
+  /// Obtain an identifier for the protocol family.
+  int family() const
+  {
+    return AF_UNIX;
+  }
+
+  /// The type of a UNIX domain endpoint.
+  typedef basic_endpoint<datagram_protocol> endpoint;
+
+  /// The UNIX domain socket type.
+  typedef basic_datagram_socket<datagram_protocol> socket;
+};
+
+} // namespace local
+} // namespace asio
+
+#endif // defined(ASIO_HAS_LOCAL_SOCKETS)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_LOCAL_DATAGRAM_PROTOCOL_HPP
diff --git a/ext/asio/local/stream_protocol.hpp b/ext/asio/local/stream_protocol.hpp
new file mode 100644
index 0000000000..47fe42f132
--- /dev/null
+++ b/ext/asio/local/stream_protocol.hpp
@@ -0,0 +1,88 @@
+//
+// stream_protocol.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_LOCAL_STREAM_PROTOCOL_HPP
+#define ASIO_LOCAL_STREAM_PROTOCOL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_socket_acceptor.hpp"
+#include "asio/basic_socket_iostream.hpp"
+#include "asio/basic_stream_socket.hpp"
+#include "asio/local/basic_endpoint.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#if defined(ASIO_HAS_LOCAL_SOCKETS) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace local {
+
+/// Encapsulates the flags needed for stream-oriented UNIX sockets.
+/**
+ * The asio::local::stream_protocol class contains flags necessary for
+ * stream-oriented UNIX domain sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Protocol.
+ */
+class stream_protocol
+{
+public:
+  /// Obtain an identifier for the type of the protocol.
+  int type() const
+  {
+    return SOCK_STREAM;
+  }
+
+  /// Obtain an identifier for the protocol.
+  int protocol() const
+  {
+    return 0;
+  }
+
+  /// Obtain an identifier for the protocol family.
+  int family() const
+  {
+    return AF_UNIX;
+  }
+
+  /// The type of a UNIX domain endpoint.
+  typedef basic_endpoint<stream_protocol> endpoint;
+
+  /// The UNIX domain socket type.
+  typedef basic_stream_socket<stream_protocol> socket;
+
+  /// The UNIX domain acceptor type.
+  typedef basic_socket_acceptor<stream_protocol> acceptor;
+
+#if !defined(BOOST_NO_IOSTREAM)
+  /// The UNIX domain iostream type.
+  typedef basic_socket_iostream<stream_protocol> iostream;
+#endif // !defined(BOOST_NO_IOSTREAM)
+};
+
+} // namespace local
+} // namespace asio
+
+#endif // defined(ASIO_HAS_LOCAL_SOCKETS)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_LOCAL_STREAM_PROTOCOL_HPP
diff --git a/ext/asio/placeholders.hpp b/ext/asio/placeholders.hpp
new file mode 100644
index 0000000000..70e69fca53
--- /dev/null
+++ b/ext/asio/placeholders.hpp
@@ -0,0 +1,107 @@
+//
+// placeholders.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_PLACEHOLDERS_HPP
+#define ASIO_PLACEHOLDERS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/bind/arg.hpp>
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace placeholders {
+
+#if defined(GENERATING_DOCUMENTATION)
+
+/// An argument placeholder, for use with boost::bind(), that corresponds to
+/// the error argument of a handler for any of the asynchronous functions.
+unspecified error;
+
+/// An argument placeholder, for use with boost::bind(), that corresponds to
+/// the bytes_transferred argument of a handler for asynchronous functions such
+/// as asio::basic_stream_socket::async_write_some or
+/// asio::async_write.
+unspecified bytes_transferred;
+
+/// An argument placeholder, for use with boost::bind(), that corresponds to
+/// the iterator argument of a handler for asynchronous functions such as
+/// asio::basic_resolver::resolve.
+unspecified iterator;
+
+#elif defined(__BORLANDC__) || defined(__GNUC__)
+
+inline boost::arg<1> error()
+{
+  return boost::arg<1>();
+}
+
+inline boost::arg<2> bytes_transferred()
+{
+  return boost::arg<2>();
+}
+
+inline boost::arg<2> iterator()
+{
+  return boost::arg<2>();
+}
+
+#else
+
+namespace detail
+{
+  template <int Number>
+  struct placeholder
+  {
+    static boost::arg<Number>& get()
+    {
+      static boost::arg<Number> result;
+      return result;
+    }
+  };
+}
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
+
+static boost::arg<1>& error
+  = asio::placeholders::detail::placeholder<1>::get();
+static boost::arg<2>& bytes_transferred
+  = asio::placeholders::detail::placeholder<2>::get();
+static boost::arg<2>& iterator
+  = asio::placeholders::detail::placeholder<2>::get();
+
+#else
+
+namespace
+{
+  boost::arg<1>& error
+    = asio::placeholders::detail::placeholder<1>::get();
+  boost::arg<2>& bytes_transferred
+    = asio::placeholders::detail::placeholder<2>::get();
+  boost::arg<2>& iterator
+    = asio::placeholders::detail::placeholder<2>::get();
+} // namespace
+
+#endif
+
+#endif
+
+} // namespace placeholders
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_PLACEHOLDERS_HPP
diff --git a/ext/asio/posix/basic_descriptor.hpp b/ext/asio/posix/basic_descriptor.hpp
new file mode 100644
index 0000000000..37bcc94dfc
--- /dev/null
+++ b/ext/asio/posix/basic_descriptor.hpp
@@ -0,0 +1,294 @@
+//
+// basic_descriptor.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_POSIX_BASIC_DESCRIPTOR_HPP
+#define ASIO_POSIX_BASIC_DESCRIPTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_io_object.hpp"
+#include "asio/error.hpp"
+#include "asio/posix/descriptor_base.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace posix {
+
+/// Provides POSIX descriptor functionality.
+/**
+ * The posix::basic_descriptor class template provides the ability to wrap a
+ * POSIX descriptor.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename DescriptorService>
+class basic_descriptor
+  : public basic_io_object<DescriptorService>,
+    public descriptor_base
+{
+public:
+  /// The native representation of a descriptor.
+  typedef typename DescriptorService::native_type native_type;
+
+  /// A basic_descriptor is always the lowest layer.
+  typedef basic_descriptor<DescriptorService> lowest_layer_type;
+
+  /// Construct a basic_descriptor without opening it.
+  /**
+   * This constructor creates a descriptor without opening it.
+   *
+   * @param io_service The io_service object that the descriptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * descriptor.
+   */
+  explicit basic_descriptor(asio::io_service& io_service)
+    : basic_io_object<DescriptorService>(io_service)
+  {
+  }
+
+  /// Construct a basic_descriptor on an existing native descriptor.
+  /**
+   * This constructor creates a descriptor object to hold an existing native
+   * descriptor.
+   *
+   * @param io_service The io_service object that the descriptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * descriptor.
+   *
+   * @param native_descriptor A native descriptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_descriptor(asio::io_service& io_service,
+      const native_type& native_descriptor)
+    : basic_io_object<DescriptorService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, native_descriptor, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * layers. Since a basic_descriptor cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A reference to the lowest layer in the stack of layers. Ownership
+   * is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return *this;
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * layers. Since a basic_descriptor cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A const reference to the lowest layer in the stack of layers.
+   * Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return *this;
+  }
+
+  /// Assign an existing native descriptor to the descriptor.
+  /*
+   * This function opens the descriptor to hold an existing native descriptor.
+   *
+   * @param native_descriptor A native descriptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void assign(const native_type& native_descriptor)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, native_descriptor, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Assign an existing native descriptor to the descriptor.
+  /*
+   * This function opens the descriptor to hold an existing native descriptor.
+   *
+   * @param native_descriptor A native descriptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code assign(const native_type& native_descriptor,
+      asio::error_code& ec)
+  {
+    return this->service.assign(this->implementation, native_descriptor, ec);
+  }
+
+  /// Determine whether the descriptor is open.
+  bool is_open() const
+  {
+    return this->service.is_open(this->implementation);
+  }
+
+  /// Close the descriptor.
+  /**
+   * This function is used to close the descriptor. Any asynchronous read or
+   * write operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void close()
+  {
+    asio::error_code ec;
+    this->service.close(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Close the descriptor.
+  /**
+   * This function is used to close the descriptor. Any asynchronous read or
+   * write operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code close(asio::error_code& ec)
+  {
+    return this->service.close(this->implementation, ec);
+  }
+
+  /// Get the native descriptor representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * descriptor. This is intended to allow access to native descriptor
+   * functionality that is not otherwise provided.
+   */
+  native_type native()
+  {
+    return this->service.native(this->implementation);
+  }
+
+  /// Cancel all asynchronous operations associated with the descriptor.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void cancel()
+  {
+    asio::error_code ec;
+    this->service.cancel(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Cancel all asynchronous operations associated with the descriptor.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code cancel(asio::error_code& ec)
+  {
+    return this->service.cancel(this->implementation, ec);
+  }
+
+  /// Perform an IO control command on the descriptor.
+  /**
+   * This function is used to execute an IO control command on the descriptor.
+   *
+   * @param command The IO control command to be performed on the descriptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa IoControlCommand @n
+   * asio::posix::descriptor_base::bytes_readable @n
+   * asio::posix::descriptor_base::non_blocking_io
+   *
+   * @par Example
+   * Getting the number of bytes ready to read:
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_service);
+   * ...
+   * asio::posix::stream_descriptor::bytes_readable command;
+   * descriptor.io_control(command);
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   */
+  template <typename IoControlCommand>
+  void io_control(IoControlCommand& command)
+  {
+    asio::error_code ec;
+    this->service.io_control(this->implementation, command, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Perform an IO control command on the descriptor.
+  /**
+   * This function is used to execute an IO control command on the descriptor.
+   *
+   * @param command The IO control command to be performed on the descriptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa IoControlCommand @n
+   * asio::posix::descriptor_base::bytes_readable @n
+   * asio::posix::descriptor_base::non_blocking_io
+   *
+   * @par Example
+   * Getting the number of bytes ready to read:
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_service);
+   * ...
+   * asio::posix::stream_descriptor::bytes_readable command;
+   * asio::error_code ec;
+   * descriptor.io_control(command, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   */
+  template <typename IoControlCommand>
+  asio::error_code io_control(IoControlCommand& command,
+      asio::error_code& ec)
+  {
+    return this->service.io_control(this->implementation, command, ec);
+  }
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~basic_descriptor()
+  {
+  }
+};
+
+} // namespace posix
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_POSIX_BASIC_DESCRIPTOR_HPP
diff --git a/ext/asio/posix/basic_stream_descriptor.hpp b/ext/asio/posix/basic_stream_descriptor.hpp
new file mode 100644
index 0000000000..21e2287dbf
--- /dev/null
+++ b/ext/asio/posix/basic_stream_descriptor.hpp
@@ -0,0 +1,304 @@
+//
+// basic_stream_descriptor.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_POSIX_BASIC_STREAM_DESCRIPTOR_HPP
+#define ASIO_POSIX_BASIC_STREAM_DESCRIPTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/posix/basic_descriptor.hpp"
+#include "asio/posix/stream_descriptor_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace posix {
+
+/// Provides stream-oriented descriptor functionality.
+/**
+ * The posix::basic_stream_descriptor class template provides asynchronous and
+ * blocking stream-oriented descriptor functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
+ */
+template <typename StreamDescriptorService = stream_descriptor_service>
+class basic_stream_descriptor
+  : public basic_descriptor<StreamDescriptorService>
+{
+public:
+  /// The native representation of a descriptor.
+  typedef typename StreamDescriptorService::native_type native_type;
+
+  /// Construct a basic_stream_descriptor without opening it.
+  /**
+   * This constructor creates a stream descriptor without opening it. The
+   * descriptor needs to be opened and then connected or accepted before data
+   * can be sent or received on it.
+   *
+   * @param io_service The io_service object that the stream descriptor will
+   * use to dispatch handlers for any asynchronous operations performed on the
+   * descriptor.
+   */
+  explicit basic_stream_descriptor(asio::io_service& io_service)
+    : basic_descriptor<StreamDescriptorService>(io_service)
+  {
+  }
+
+  /// Construct a basic_stream_descriptor on an existing native descriptor.
+  /**
+   * This constructor creates a stream descriptor object to hold an existing
+   * native descriptor.
+   *
+   * @param io_service The io_service object that the stream descriptor will
+   * use to dispatch handlers for any asynchronous operations performed on the
+   * descriptor.
+   *
+   * @param native_descriptor The new underlying descriptor implementation.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_stream_descriptor(asio::io_service& io_service,
+      const native_type& native_descriptor)
+    : basic_descriptor<StreamDescriptorService>(io_service, native_descriptor)
+  {
+  }
+
+  /// Write some data to the descriptor.
+  /**
+   * This function is used to write data to the stream descriptor. The function
+   * call will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the descriptor.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * descriptor.write_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.write_some(this->implementation, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Write some data to the descriptor.
+  /**
+   * This function is used to write data to the stream descriptor. The function
+   * call will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the descriptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.write_some(this->implementation, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  /**
+   * This function is used to asynchronously write data to the stream
+   * descriptor. The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be written to the descriptor.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * descriptor.async_write_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    this->service.async_write_some(this->implementation, buffers, handler);
+  }
+
+  /// Read some data from the descriptor.
+  /**
+   * This function is used to read data from the stream descriptor. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * descriptor.read_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.read_some(this->implementation, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Read some data from the descriptor.
+  /**
+   * This function is used to read data from the stream descriptor. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.read_some(this->implementation, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  /**
+   * This function is used to asynchronously read data from the stream
+   * descriptor. The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read function if you need to ensure that the
+   * requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * descriptor.async_read_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    this->service.async_read_some(this->implementation, buffers, handler);
+  }
+};
+
+} // namespace posix
+} // namespace asio
+
+#endif // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_POSIX_BASIC_STREAM_DESCRIPTOR_HPP
diff --git a/ext/asio/posix/descriptor_base.hpp b/ext/asio/posix/descriptor_base.hpp
new file mode 100644
index 0000000000..29e17469df
--- /dev/null
+++ b/ext/asio/posix/descriptor_base.hpp
@@ -0,0 +1,93 @@
+//
+// descriptor_base.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_POSIX_DESCRIPTOR_BASE_HPP
+#define ASIO_POSIX_DESCRIPTOR_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/io_control.hpp"
+#include "asio/detail/socket_option.hpp"
+
+namespace asio {
+namespace posix {
+
+/// The descriptor_base class is used as a base for the basic_stream_descriptor
+/// class template so that we have a common place to define the associated
+/// IO control commands.
+class descriptor_base
+{
+public:
+  /// IO control command to set the blocking mode of the descriptor.
+  /**
+   * Implements the FIONBIO IO control command.
+   *
+   * @par Example
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_service); 
+   * ...
+   * asio::descriptor_base::non_blocking_io command(true);
+   * descriptor.io_control(command);
+   * @endcode
+   *
+   * @par Concepts:
+   * IoControlCommand.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined non_blocking_io;
+#else
+  typedef asio::detail::io_control::non_blocking_io non_blocking_io;
+#endif
+
+  /// IO control command to get the amount of data that can be read without
+  /// blocking.
+  /**
+   * Implements the FIONREAD IO control command.
+   *
+   * @par Example
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_service); 
+   * ...
+   * asio::descriptor_base::bytes_readable command(true);
+   * descriptor.io_control(command);
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   *
+   * @par Concepts:
+   * IoControlCommand.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined bytes_readable;
+#else
+  typedef asio::detail::io_control::bytes_readable bytes_readable;
+#endif
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~descriptor_base()
+  {
+  }
+};
+
+} // namespace posix
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_POSIX_DESCRIPTOR_BASE_HPP
diff --git a/ext/asio/posix/stream_descriptor.hpp b/ext/asio/posix/stream_descriptor.hpp
new file mode 100644
index 0000000000..72fbbed23c
--- /dev/null
+++ b/ext/asio/posix/stream_descriptor.hpp
@@ -0,0 +1,39 @@
+//
+// stream_descriptor.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_POSIX_STREAM_DESCRIPTOR_HPP
+#define ASIO_POSIX_STREAM_DESCRIPTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/posix/basic_stream_descriptor.hpp"
+
+#if defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace posix {
+
+/// Typedef for the typical usage of a stream-oriented descriptor.
+typedef basic_stream_descriptor<> stream_descriptor;
+
+} // namespace posix
+} // namespace asio
+
+#endif // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_POSIX_STREAM_DESCRIPTOR_HPP
diff --git a/ext/asio/posix/stream_descriptor_service.hpp b/ext/asio/posix/stream_descriptor_service.hpp
new file mode 100644
index 0000000000..61cee1b54d
--- /dev/null
+++ b/ext/asio/posix/stream_descriptor_service.hpp
@@ -0,0 +1,187 @@
+//
+// stream_descriptor_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_POSIX_STREAM_DESCRIPTOR_SERVICE_HPP
+#define ASIO_POSIX_STREAM_DESCRIPTOR_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+
+#if !defined(ASIO_DISABLE_POSIX_STREAM_DESCRIPTOR)
+# if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+#  define ASIO_HAS_POSIX_STREAM_DESCRIPTOR 1
+# endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+#endif // !defined(ASIO_DISABLE_POSIX_STREAM_DESCRIPTOR)
+
+#if defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/reactive_descriptor_service.hpp"
+
+namespace asio {
+namespace posix {
+
+/// Default service implementation for a stream descriptor.
+class stream_descriptor_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<stream_descriptor_service>
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+private:
+  // The type of the platform-specific implementation.
+  typedef detail::reactive_descriptor_service service_impl_type;
+
+public:
+  /// The type of a stream descriptor implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native descriptor type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new stream descriptor service for the specified io_service.
+  explicit stream_descriptor_service(asio::io_service& io_service)
+    : asio::detail::service_base<stream_descriptor_service>(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined descriptorr objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new stream descriptor implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a stream descriptor implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Assign an existing native descriptor to a stream descriptor.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_descriptor, asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, native_descriptor, ec);
+  }
+
+  /// Determine whether the descriptor is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Close a stream descriptor implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native descriptor implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the descriptor.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Perform an IO control command on the descriptor.
+  template <typename IoControlCommand>
+  asio::error_code io_control(implementation_type& impl,
+      IoControlCommand& command, asio::error_code& ec)
+  {
+    return service_impl_.io_control(impl, command, ec);
+  }
+
+  /// Write the given data to the stream.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.write_some(impl, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, WriteHandler descriptorr)
+  {
+    service_impl_.async_write_some(impl, buffers, descriptorr);
+  }
+
+  /// Read some data from the stream.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.read_some(impl, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, ReadHandler descriptorr)
+  {
+    service_impl_.async_read_some(impl, buffers, descriptorr);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace posix
+} // namespace asio
+
+#endif // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_POSIX_STREAM_DESCRIPTOR_SERVICE_HPP
diff --git a/ext/asio/raw_socket_service.hpp b/ext/asio/raw_socket_service.hpp
new file mode 100644
index 0000000000..a8973d3445
--- /dev/null
+++ b/ext/asio/raw_socket_service.hpp
@@ -0,0 +1,315 @@
+//
+// raw_socket_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_RAW_SOCKET_SERVICE_HPP
+#define ASIO_RAW_SOCKET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_socket_service.hpp"
+#else
+# include "asio/detail/reactive_socket_service.hpp"
+#endif
+
+namespace asio {
+
+/// Default service implementation for a raw socket.
+template <typename Protocol>
+class raw_socket_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<raw_socket_service<Protocol> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+private:
+  // The type of the platform-specific implementation.
+#if defined(ASIO_HAS_IOCP)
+  typedef detail::win_iocp_socket_service<Protocol> service_impl_type;
+#else
+  typedef detail::reactive_socket_service<Protocol> service_impl_type;
+#endif
+
+public:
+  /// The type of a raw socket.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native socket type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef typename service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new raw socket service for the specified io_service.
+  explicit raw_socket_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        raw_socket_service<Protocol> >(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new raw socket implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a raw socket implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  // Open a new raw socket implementation.
+  asio::error_code open(implementation_type& impl,
+      const protocol_type& protocol, asio::error_code& ec)
+  {
+    if (protocol.type() == SOCK_RAW)
+      service_impl_.open(impl, protocol, ec);
+    else
+      ec = asio::error::invalid_argument;
+    return ec;
+  }
+
+  /// Assign an existing native socket to a raw socket.
+  asio::error_code assign(implementation_type& impl,
+      const protocol_type& protocol, const native_type& native_socket,
+      asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, protocol, native_socket, ec);
+  }
+
+  /// Determine whether the socket is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Close a raw socket implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native socket implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the socket.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Determine whether the socket is at the out-of-band data mark.
+  bool at_mark(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.at_mark(impl, ec);
+  }
+
+  /// Determine the number of bytes available for reading.
+  std::size_t available(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.available(impl, ec);
+  }
+
+  // Bind the raw socket to the specified local endpoint.
+  asio::error_code bind(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    return service_impl_.bind(impl, endpoint, ec);
+  }
+
+  /// Connect the raw socket to the specified endpoint.
+  asio::error_code connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, asio::error_code& ec)
+  {
+    return service_impl_.connect(impl, peer_endpoint, ec);
+  }
+
+  /// Start an asynchronous connect.
+  template <typename ConnectHandler>
+  void async_connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, ConnectHandler handler)
+  {
+    service_impl_.async_connect(impl, peer_endpoint, handler);
+  }
+
+  /// Set a socket option.
+  template <typename SettableSocketOption>
+  asio::error_code set_option(implementation_type& impl,
+      const SettableSocketOption& option, asio::error_code& ec)
+  {
+    return service_impl_.set_option(impl, option, ec);
+  }
+
+  /// Get a socket option.
+  template <typename GettableSocketOption>
+  asio::error_code get_option(const implementation_type& impl,
+      GettableSocketOption& option, asio::error_code& ec) const
+  {
+    return service_impl_.get_option(impl, option, ec);
+  }
+
+  /// Perform an IO control command on the socket.
+  template <typename IoControlCommand>
+  asio::error_code io_control(implementation_type& impl,
+      IoControlCommand& command, asio::error_code& ec)
+  {
+    return service_impl_.io_control(impl, command, ec);
+  }
+
+  /// Get the local endpoint.
+  endpoint_type local_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.local_endpoint(impl, ec);
+  }
+
+  /// Get the remote endpoint.
+  endpoint_type remote_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.remote_endpoint(impl, ec);
+  }
+
+  /// Disable sends or receives on the socket.
+  asio::error_code shutdown(implementation_type& impl,
+      socket_base::shutdown_type what, asio::error_code& ec)
+  {
+    return service_impl_.shutdown(impl, what, ec);
+  }
+
+  /// Send the given data to the peer.
+  template <typename ConstBufferSequence>
+  std::size_t send(implementation_type& impl,
+      const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.send(impl, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(implementation_type& impl, const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    service_impl_.async_send(impl, buffers, flags, handler);
+  }
+
+  /// Send raw data to the specified endpoint.
+  template <typename ConstBufferSequence>
+  std::size_t send_to(implementation_type& impl,
+      const ConstBufferSequence& buffers, const endpoint_type& destination,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.send_to(impl, buffers, destination, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send_to(implementation_type& impl,
+      const ConstBufferSequence& buffers, const endpoint_type& destination,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    service_impl_.async_send_to(impl, buffers, destination, flags, handler);
+  }
+
+  /// Receive some data from the peer.
+  template <typename MutableBufferSequence>
+  std::size_t receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.receive(impl, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous receive.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    service_impl_.async_receive(impl, buffers, flags, handler);
+  }
+
+  /// Receive raw data with the endpoint of the sender.
+  template <typename MutableBufferSequence>
+  std::size_t receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.receive_from(impl, buffers, sender_endpoint, flags,
+        ec);
+  }
+
+  /// Start an asynchronous receive that will get the endpoint of the sender.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive_from(implementation_type& impl,
+      const MutableBufferSequence& buffers, endpoint_type& sender_endpoint,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    service_impl_.async_receive_from(impl, buffers, sender_endpoint, flags,
+        handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_RAW_SOCKET_SERVICE_HPP
diff --git a/ext/asio/read.hpp b/ext/asio/read.hpp
new file mode 100644
index 0000000000..859c05a003
--- /dev/null
+++ b/ext/asio/read.hpp
@@ -0,0 +1,543 @@
+//
+// read.hpp
+// ~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_READ_HPP
+#define ASIO_READ_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_streambuf.hpp"
+#include "asio/error.hpp"
+
+namespace asio {
+
+/**
+ * @defgroup read asio::read
+ *
+ * @brief Attempt to read a certain amount of data from a stream before
+ * returning.
+ */
+/*@{*/
+
+/// Attempt to read a certain amount of data from a stream before returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * stream. The call will block until one of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * stream.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code asio::read(s, asio::buffer(data, size)); @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::read(
+ *     s, buffers,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncReadStream, typename MutableBufferSequence>
+std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers);
+
+/// Attempt to read a certain amount of data from a stream before returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * stream. The call will block until one of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * stream.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the stream's read_some function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code asio::read(s, asio::buffer(data, size),
+ *     asio::transfer_at_least(32)); @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename SyncReadStream, typename MutableBufferSequence,
+  typename CompletionCondition>
+std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition);
+
+/// Attempt to read a certain amount of data from a stream before returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * stream. The call will block until one of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * stream.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the stream's read_some function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes read. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncReadStream, typename MutableBufferSequence,
+    typename CompletionCondition>
+std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Attempt to read a certain amount of data from a stream before returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * stream. The call will block until one of the following conditions is true:
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b The basic_streambuf object into which the data will be read.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::read(
+ *     s, b,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncReadStream, typename Allocator>
+std::size_t read(SyncReadStream& s, basic_streambuf<Allocator>& b);
+
+/// Attempt to read a certain amount of data from a stream before returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * stream. The call will block until one of the following conditions is true:
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b The basic_streambuf object into which the data will be read.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the stream's read_some function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ */
+template <typename SyncReadStream, typename Allocator,
+    typename CompletionCondition>
+std::size_t read(SyncReadStream& s, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition);
+
+/// Attempt to read a certain amount of data from a stream before returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * stream. The call will block until one of the following conditions is true:
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b The basic_streambuf object into which the data will be read.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the stream's read_some function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes read. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncReadStream, typename Allocator,
+    typename CompletionCondition>
+std::size_t read(SyncReadStream& s, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, asio::error_code& ec);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+/**
+ * @defgroup async_read asio::async_read
+ *
+ * @brief Start an asynchronous operation to read a certain amount of data from
+ * a stream.
+ */
+/*@{*/
+
+/// Start an asynchronous operation to read a certain amount of data from a
+/// stream.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions is
+ * true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_read_some function, and is known as a <em>composed operation</em>. The
+ * program must ensure that the stream performs no other read operations (such
+ * as async_read, the stream's async_read_some function, or any other composed
+ * operations that perform reads) until this operation completes.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * stream. Although the buffers object may be copied as necessary, ownership of
+ * the underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes copied into the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be the  number of
+ *                                           // bytes successfully transferred
+ *                                           // prior to the error.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code
+ * asio::async_read(s, asio::buffer(data, size), handler);
+ * @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::async_read(
+ *     s, buffers,
+ *     asio::transfer_all(),
+ *     handler); @endcode
+ */
+template <typename AsyncReadStream, typename MutableBufferSequence,
+    typename ReadHandler>
+void async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
+    ReadHandler handler);
+
+/// Start an asynchronous operation to read a certain amount of data from a
+/// stream.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions is
+ * true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * stream. Although the buffers object may be copied as necessary, ownership of
+ * the underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_read_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the stream's async_read_some function.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes copied into the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be the  number of
+ *                                           // bytes successfully transferred
+ *                                           // prior to the error.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code asio::async_read(s,
+ *     asio::buffer(data, size),
+ *     asio::transfer_at_least(32),
+ *     handler); @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename AsyncReadStream, typename MutableBufferSequence,
+    typename CompletionCondition, typename ReadHandler>
+void async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, ReadHandler handler);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Start an asynchronous operation to read a certain amount of data from a
+/// stream.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions is
+ * true:
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_read_some function, and is known as a <em>composed operation</em>. The
+ * program must ensure that the stream performs no other read operations (such
+ * as async_read, the stream's async_read_some function, or any other composed
+ * operations that perform reads) until this operation completes.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param b A basic_streambuf object into which the data will be read. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes copied into the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be the  number of
+ *                                           // bytes successfully transferred
+ *                                           // prior to the error.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::async_read(
+ *     s, b,
+ *     asio::transfer_all(),
+ *     handler); @endcode
+ */
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read(AsyncReadStream& s, basic_streambuf<Allocator>& b,
+    ReadHandler handler);
+
+/// Start an asynchronous operation to read a certain amount of data from a
+/// stream.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions is
+ * true:
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_read_some function, and is known as a <em>composed operation</em>. The
+ * program must ensure that the stream performs no other read operations (such
+ * as async_read, the stream's async_read_some function, or any other composed
+ * operations that perform reads) until this operation completes.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param b A basic_streambuf object into which the data will be read. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_read_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the stream's async_read_some function.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes copied into the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be the  number of
+ *                                           // bytes successfully transferred
+ *                                           // prior to the error.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ */
+template <typename AsyncReadStream, typename Allocator,
+    typename CompletionCondition, typename ReadHandler>
+void async_read(AsyncReadStream& s, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, ReadHandler handler);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+
+} // namespace asio
+
+#include "asio/impl/read.ipp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_READ_HPP
diff --git a/ext/asio/read_at.hpp b/ext/asio/read_at.hpp
new file mode 100644
index 0000000000..6bb3fe125a
--- /dev/null
+++ b/ext/asio/read_at.hpp
@@ -0,0 +1,576 @@
+//
+// read_at.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_READ_AT_HPP
+#define ASIO_READ_AT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_streambuf.hpp"
+#include "asio/error.hpp"
+
+namespace asio {
+
+/**
+ * @defgroup read_at asio::read_at
+ *
+ * @brief Attempt to read a certain amount of data at the specified offset
+ * before returning.
+ */
+/*@{*/
+
+/// Attempt to read a certain amount of data at the specified offset before
+/// returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * random access device at the specified offset. The call will block until one
+ * of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the SyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * device.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code asio::read_at(d, 42, asio::buffer(data, size)); @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::read_at(
+ *     d, 42, buffers,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers);
+
+/// Attempt to read a certain amount of data at the specified offset before
+/// returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * random access device at the specified offset. The call will block until one
+ * of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the SyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * device.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the device's read_some_at function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code asio::read_at(d, 42, asio::buffer(data, size),
+ *     asio::transfer_at_least(32)); @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition);
+
+/// Attempt to read a certain amount of data at the specified offset before
+/// returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * random access device at the specified offset. The call will block until one
+ * of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the SyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * device.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the device's read_some_at function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes read. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Attempt to read a certain amount of data at the specified offset before
+/// returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * random access device at the specified offset. The call will block until one
+ * of the following conditions is true:
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the SyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param b The basic_streambuf object into which the data will be read.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::read_at(
+ *     d, 42, b,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncRandomAccessReadDevice, typename Allocator>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, basic_streambuf<Allocator>& b);
+
+/// Attempt to read a certain amount of data at the specified offset before
+/// returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * random access device at the specified offset. The call will block until one
+ * of the following conditions is true:
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the SyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param b The basic_streambuf object into which the data will be read.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the device's read_some_at function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ */
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+    typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition);
+
+/// Attempt to read a certain amount of data at the specified offset before
+/// returning.
+/**
+ * This function is used to read a certain number of bytes of data from a
+ * random access device at the specified offset. The call will block until one
+ * of the following conditions is true:
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the SyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param b The basic_streambuf object into which the data will be read.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest read_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the device's read_some_at function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes read. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+    typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, asio::error_code& ec);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+/**
+ * @defgroup async_read_at asio::async_read_at
+ *
+ * @brief Start an asynchronous operation to read a certain amount of data at
+ * the specified offset.
+ */
+/*@{*/
+
+/// Start an asynchronous operation to read a certain amount of data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a random access device at the specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * async_read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the AsyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * device. Although the buffers object may be copied as necessary, ownership of
+ * the underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes copied into the buffers. If an error
+ *   // occurred, this will be the number of bytes successfully
+ *   // transferred prior to the error.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code
+ * asio::async_read_at(d, 42, asio::buffer(data, size), handler);
+ * @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::async_read_at(
+ *     d, 42, buffers,
+ *     asio::transfer_all(),
+ *     handler); @endcode
+ */
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename ReadHandler>
+void async_read_at(AsyncRandomAccessReadDevice& d, boost::uint64_t offset,
+    const MutableBufferSequence& buffers, ReadHandler handler);
+
+/// Start an asynchronous operation to read a certain amount of data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a random access device at the specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li The supplied buffers are full. That is, the bytes transferred is equal to
+ * the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the AsyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param buffers One or more buffers into which the data will be read. The sum
+ * of the buffer sizes indicates the maximum number of bytes to read from the
+ * device. Although the buffers object may be copied as necessary, ownership of
+ * the underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_read_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the device's async_read_some_at function.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes copied into the buffers. If an error
+ *   // occurred, this will be the number of bytes successfully
+ *   // transferred prior to the error.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To read into a single data buffer use the @ref buffer function as follows:
+ * @code asio::async_read_at(d, 42,
+ *     asio::buffer(data, size),
+ *     asio::transfer_at_least(32),
+ *     handler); @endcode
+ * See the @ref buffer documentation for information on reading into multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+    typename CompletionCondition, typename ReadHandler>
+void async_read_at(AsyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, const MutableBufferSequence& buffers,
+    CompletionCondition completion_condition, ReadHandler handler);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Start an asynchronous operation to read a certain amount of data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a random access device at the specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * async_read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the AsyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param b A basic_streambuf object into which the data will be read. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes copied into the buffers. If an error
+ *   // occurred, this will be the number of bytes successfully
+ *   // transferred prior to the error.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::async_read_at(
+ *     d, 42, b,
+ *     asio::transfer_all(),
+ *     handler); @endcode
+ */
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+    typename ReadHandler>
+void async_read_at(AsyncRandomAccessReadDevice& d, boost::uint64_t offset,
+    basic_streambuf<Allocator>& b, ReadHandler handler);
+
+/// Start an asynchronous operation to read a certain amount of data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously read a certain number of bytes of
+ * data from a random access device at the specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * async_read_some_at function.
+ *
+ * @param d The device from which the data is to be read. The type must support
+ * the AsyncRandomAccessReadDevice concept.
+ *
+ * @param offset The offset at which the data will be read.
+ *
+ * @param b A basic_streambuf object into which the data will be read. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the read operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_read_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the read operation is complete. A non-zero
+ * return value indicates the maximum number of bytes to be read on the next
+ * call to the device's async_read_some_at function.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes copied into the buffers. If an error
+ *   // occurred, this will be the number of bytes successfully
+ *   // transferred prior to the error.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ */
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+    typename CompletionCondition, typename ReadHandler>
+void async_read_at(AsyncRandomAccessReadDevice& d,
+    boost::uint64_t offset, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, ReadHandler handler);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+
+} // namespace asio
+
+#include "asio/impl/read_at.ipp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_READ_AT_HPP
diff --git a/ext/asio/read_until.hpp b/ext/asio/read_until.hpp
new file mode 100644
index 0000000000..5df71ce29c
--- /dev/null
+++ b/ext/asio/read_until.hpp
@@ -0,0 +1,923 @@
+//
+// read_until.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_READ_UNTIL_HPP
+#define ASIO_READ_UNTIL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/regex.hpp>
+#include <boost/type_traits/is_function.hpp>
+#include <boost/type_traits/remove_pointer.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/detail/workaround.hpp>
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_streambuf.hpp"
+#include "asio/error.hpp"
+
+namespace asio {
+
+namespace detail
+{
+#if BOOST_WORKAROUND(__CODEGEARC__, BOOST_TESTED_AT(0x610))
+  template <typename T>
+  struct has_result_type
+  {
+    template <typename U> struct inner
+    {
+        struct big { char a[100]; };
+        static big helper(U, ...);
+        static char helper(U, typename U::result_type* = 0);
+    };
+    static const T& ref();
+    enum { value = (sizeof((inner<const T&>::helper)((ref)())) == 1) };
+  };
+#else // BOOST_WORKAROUND(__CODEGEARC__, BOOST_TESTED_AT(0x610))
+  template <typename T>
+  struct has_result_type
+  {
+    struct big { char a[100]; };
+    template <typename U> static big helper(U, ...);
+    template <typename U> static char helper(U, typename U::result_type* = 0);
+    static const T& ref();
+    enum { value = (sizeof((helper)((ref)())) == 1) };
+  };
+#endif // BOOST_WORKAROUND(__CODEGEARC__, BOOST_TESTED_AT(0x610))
+} // namespace detail
+
+/// Type trait used to determine whether a type can be used as a match condition
+/// function with read_until and async_read_until.
+template <typename T>
+struct is_match_condition
+{
+#if defined(GENERATING_DOCUMENTATION)
+  /// The value member is true if the type may be used as a match condition.
+  static const bool value;
+#else
+  enum
+  {
+    value = boost::is_function<typename boost::remove_pointer<T>::type>::value
+      || detail::has_result_type<T>::value
+  };
+#endif
+};
+
+/**
+ * @defgroup read_until asio::read_until
+ *
+ * @brief Read data into a streambuf until it contains a delimiter, matches a
+ * regular expression, or a function object indicates a match.
+ */
+/*@{*/
+
+/// Read data into a streambuf until it contains a specified delimiter.
+/**
+ * This function is used to read data into the specified streambuf until the
+ * streambuf's get area contains the specified delimiter. The call will block
+ * until one of the following conditions is true:
+ *
+ * @li The get area of the streambuf contains the specified delimiter.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the streambuf's get area already contains the
+ * delimiter, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param delim The delimiter character.
+ *
+ * @returns The number of bytes in the streambuf's get area up to and including
+ * the delimiter.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond the delimiter. An application will typically leave
+ * that data in the streambuf for a subsequent read_until operation to examine.
+ *
+ * @par Example
+ * To read data into a streambuf until a newline is encountered:
+ * @code asio::streambuf b;
+ * asio::read_until(s, b, '\n');
+ * std::istream is(&b);
+ * std::string line;
+ * std::getline(is, line); @endcode
+ * After the @c read_until operation completes successfully, the buffer @c b
+ * contains the delimiter:
+ * @code { 'a', 'b', ..., 'c', '\n', 'd', 'e', ... } @endcode
+ * The call to @c std::getline then extracts the data up to and including the
+ * delimiter, so that the string @c line contains:
+ * @code { 'a', 'b', ..., 'c', '\n' } @endcode
+ * The remaining data is left in the buffer @c b as follows:
+ * @code { 'd', 'e', ... } @endcode
+ * This data may be the start of a new line, to be extracted by a subsequent
+ * @c read_until operation.
+ */
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, char delim);
+
+/// Read data into a streambuf until it contains a specified delimiter.
+/**
+ * This function is used to read data into the specified streambuf until the
+ * streambuf's get area contains the specified delimiter. The call will block
+ * until one of the following conditions is true:
+ *
+ * @li The get area of the streambuf contains the specified delimiter.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the streambuf's get area already contains the
+ * delimiter, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param delim The delimiter character.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes in the streambuf's get area up to and including
+ * the delimiter. Returns 0 if an error occurred.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond the delimiter. An application will typically leave
+ * that data in the streambuf for a subsequent read_until operation to examine.
+ */
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, char delim,
+    asio::error_code& ec);
+
+/// Read data into a streambuf until it contains a specified delimiter.
+/**
+ * This function is used to read data into the specified streambuf until the
+ * streambuf's get area contains the specified delimiter. The call will block
+ * until one of the following conditions is true:
+ *
+ * @li The get area of the streambuf contains the specified delimiter.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the streambuf's get area already contains the
+ * delimiter, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param delim The delimiter string.
+ *
+ * @returns The number of bytes in the streambuf's get area up to and including
+ * the delimiter.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond the delimiter. An application will typically leave
+ * that data in the streambuf for a subsequent read_until operation to examine.
+ *
+ * @par Example
+ * To read data into a streambuf until a newline is encountered:
+ * @code asio::streambuf b;
+ * asio::read_until(s, b, "\r\n");
+ * std::istream is(&b);
+ * std::string line;
+ * std::getline(is, line); @endcode
+ * After the @c read_until operation completes successfully, the buffer @c b
+ * contains the delimiter:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
+ * The call to @c std::getline then extracts the data up to and including the
+ * delimiter, so that the string @c line contains:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
+ * The remaining data is left in the buffer @c b as follows:
+ * @code { 'd', 'e', ... } @endcode
+ * This data may be the start of a new line, to be extracted by a subsequent
+ * @c read_until operation.
+ */
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const std::string& delim);
+
+/// Read data into a streambuf until it contains a specified delimiter.
+/**
+ * This function is used to read data into the specified streambuf until the
+ * streambuf's get area contains the specified delimiter. The call will block
+ * until one of the following conditions is true:
+ *
+ * @li The get area of the streambuf contains the specified delimiter.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the streambuf's get area already contains the
+ * delimiter, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param delim The delimiter string.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes in the streambuf's get area up to and including
+ * the delimiter. Returns 0 if an error occurred.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond the delimiter. An application will typically leave
+ * that data in the streambuf for a subsequent read_until operation to examine.
+ */
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const std::string& delim,
+    asio::error_code& ec);
+
+/// Read data into a streambuf until some part of the data it contains matches
+/// a regular expression.
+/**
+ * This function is used to read data into the specified streambuf until the
+ * streambuf's get area contains some data that matches a regular expression.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li A substring of the streambuf's get area matches the regular expression.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the streambuf's get area already contains data that
+ * matches the regular expression, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param expr The regular expression.
+ *
+ * @returns The number of bytes in the streambuf's get area up to and including
+ * the substring that matches the regular expression.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond that which matched the regular expression. An
+ * application will typically leave that data in the streambuf for a subsequent
+ * read_until operation to examine.
+ *
+ * @par Example
+ * To read data into a streambuf until a CR-LF sequence is encountered:
+ * @code asio::streambuf b;
+ * asio::read_until(s, b, boost::regex("\r\n"));
+ * std::istream is(&b);
+ * std::string line;
+ * std::getline(is, line); @endcode
+ * After the @c read_until operation completes successfully, the buffer @c b
+ * contains the data which matched the regular expression:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
+ * The call to @c std::getline then extracts the data up to and including the
+ * match, so that the string @c line contains:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
+ * The remaining data is left in the buffer @c b as follows:
+ * @code { 'd', 'e', ... } @endcode
+ * This data may be the start of a new line, to be extracted by a subsequent
+ * @c read_until operation.
+ */
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr);
+
+/// Read data into a streambuf until some part of the data it contains matches
+/// a regular expression.
+/**
+ * This function is used to read data into the specified streambuf until the
+ * streambuf's get area contains some data that matches a regular expression.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li A substring of the streambuf's get area matches the regular expression.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the streambuf's get area already contains data that
+ * matches the regular expression, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param expr The regular expression.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes in the streambuf's get area up to and including
+ * the substring that matches the regular expression. Returns 0 if an error
+ * occurred.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond that which matched the regular expression. An
+ * application will typically leave that data in the streambuf for a subsequent
+ * read_until operation to examine.
+ */
+template <typename SyncReadStream, typename Allocator>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
+    asio::error_code& ec);
+
+/// Read data into a streambuf until a function object indicates a match.
+/**
+ * This function is used to read data into the specified streambuf until a
+ * user-defined match condition function object, when applied to the data
+ * contained in the streambuf, indicates a successful match. The call will
+ * block until one of the following conditions is true:
+ *
+ * @li The match condition function object returns a std::pair where the second
+ * element evaluates to true.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the match condition function object already indicates
+ * a match, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param match_condition The function object to be called to determine whether
+ * a match exists. The signature of the function object must be:
+ * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
+ * @endcode
+ * where @c iterator represents the type:
+ * @code buffers_iterator<basic_streambuf<Allocator>::const_buffers_type>
+ * @endcode
+ * The iterator parameters @c begin and @c end define the range of bytes to be
+ * scanned to determine whether there is a match. The @c first member of the
+ * return value is an iterator marking one-past-the-end of the bytes that have
+ * been consumed by the match function. This iterator is used to calculate the
+ * @c begin parameter for any subsequent invocation of the match condition. The
+ * @c second member of the return value is true if a match has been found, false
+ * otherwise.
+ *
+ * @returns The number of bytes in the streambuf's get area that have been fully
+ * consumed by the match function.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond that which matched the function object. An application
+ * will typically leave that data in the streambuf for a subsequent
+ *
+ * @note The default implementation of the @c is_match_condition type trait
+ * evaluates to true for function pointers and function objects with a
+ * @c result_type typedef. It must be specialised for other user-defined
+ * function objects.
+ *
+ * @par Examples
+ * To read data into a streambuf until whitespace is encountered:
+ * @code typedef asio::buffers_iterator<
+ *     asio::streambuf::const_buffers_type> iterator;
+ *
+ * std::pair<iterator, bool>
+ * match_whitespace(iterator begin, iterator end)
+ * {
+ *   iterator i = begin;
+ *   while (i != end)
+ *     if (std::isspace(*i++))
+ *       return std::make_pair(i, true);
+ *   return std::make_pair(i, false);
+ * }
+ * ...
+ * asio::streambuf b;
+ * asio::read_until(s, b, match_whitespace);
+ * @endcode
+ *
+ * To read data into a streambuf until a matching character is found:
+ * @code class match_char
+ * {
+ * public:
+ *   explicit match_char(char c) : c_(c) {}
+ *
+ *   template <typename Iterator>
+ *   std::pair<Iterator, bool> operator()(
+ *       Iterator begin, Iterator end) const
+ *   {
+ *     Iterator i = begin;
+ *     while (i != end)
+ *       if (c_ == *i++)
+ *         return std::make_pair(i, true);
+ *     return std::make_pair(i, false);
+ *   }
+ *
+ * private:
+ *   char c_;
+ * };
+ *
+ * namespace asio {
+ *   template <> struct is_match_condition<match_char>
+ *     : public boost::true_type {};
+ * } // namespace asio
+ * ...
+ * asio::streambuf b;
+ * asio::read_until(s, b, match_char('a'));
+ * @endcode
+ */
+template <typename SyncReadStream, typename Allocator, typename MatchCondition>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, MatchCondition match_condition,
+    typename boost::enable_if<is_match_condition<MatchCondition> >::type* = 0);
+
+/// Read data into a streambuf until a function object indicates a match.
+/**
+ * This function is used to read data into the specified streambuf until a
+ * user-defined match condition function object, when applied to the data
+ * contained in the streambuf, indicates a successful match. The call will
+ * block until one of the following conditions is true:
+ *
+ * @li The match condition function object returns a std::pair where the second
+ * element evaluates to true.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * read_some function. If the match condition function object already indicates
+ * a match, the function returns immediately.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the SyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param match_condition The function object to be called to determine whether
+ * a match exists. The signature of the function object must be:
+ * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
+ * @endcode
+ * where @c iterator represents the type:
+ * @code buffers_iterator<basic_streambuf<Allocator>::const_buffers_type>
+ * @endcode
+ * The iterator parameters @c begin and @c end define the range of bytes to be
+ * scanned to determine whether there is a match. The @c first member of the
+ * return value is an iterator marking one-past-the-end of the bytes that have
+ * been consumed by the match function. This iterator is used to calculate the
+ * @c begin parameter for any subsequent invocation of the match condition. The
+ * @c second member of the return value is true if a match has been found, false
+ * otherwise.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes in the streambuf's get area that have been fully
+ * consumed by the match function. Returns 0 if an error occurred.
+ *
+ * @note After a successful read_until operation, the streambuf may contain
+ * additional data beyond that which matched the function object. An application
+ * will typically leave that data in the streambuf for a subsequent
+ *
+ * @note The default implementation of the @c is_match_condition type trait
+ * evaluates to true for function pointers and function objects with a
+ * @c result_type typedef. It must be specialised for other user-defined
+ * function objects.
+ */
+template <typename SyncReadStream, typename Allocator, typename MatchCondition>
+std::size_t read_until(SyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    MatchCondition match_condition, asio::error_code& ec,
+    typename boost::enable_if<is_match_condition<MatchCondition> >::type* = 0);
+
+/*@}*/
+/**
+ * @defgroup async_read_until asio::async_read_until
+ *
+ * @brief Start an asynchronous operation to read data into a streambuf until it
+ * contains a delimiter, matches a regular expression, or a function object
+ * indicates a match.
+ */
+/*@{*/
+
+/// Start an asynchronous operation to read data into a streambuf until it
+/// contains a specified delimiter.
+/**
+ * This function is used to asynchronously read data into the specified
+ * streambuf until the streambuf's get area contains the specified delimiter.
+ * The function call always returns immediately. The asynchronous operation
+ * will continue until one of the following conditions is true:
+ *
+ * @li The get area of the streambuf contains the specified delimiter.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_read_some function, and is known as a <em>composed operation</em>. If
+ * the streambuf's get area already contains the delimiter, this asynchronous
+ * operation completes immediately. The program must ensure that the stream
+ * performs no other read operations (such as async_read, async_read_until, the
+ * stream's async_read_some function, or any other composed operations that
+ * perform reads) until this operation completes.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read. Ownership of
+ * the streambuf is retained by the caller, which must guarantee that it remains
+ * valid until the handler is called.
+ *
+ * @param delim The delimiter character.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // The number of bytes in the streambuf's get
+ *   // area up to and including the delimiter.
+ *   // 0 if an error occurred.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @note After a successful async_read_until operation, the streambuf may
+ * contain additional data beyond the delimiter. An application will typically
+ * leave that data in the streambuf for a subsequent async_read_until operation
+ * to examine.
+ *
+ * @par Example
+ * To asynchronously read data into a streambuf until a newline is encountered:
+ * @code asio::streambuf b;
+ * ...
+ * void handler(const asio::error_code& e, std::size_t size)
+ * {
+ *   if (!e)
+ *   {
+ *     std::istream is(&b);
+ *     std::string line;
+ *     std::getline(is, line);
+ *     ...
+ *   }
+ * }
+ * ...
+ * asio::async_read_until(s, b, '\n', handler); @endcode
+ * After the @c async_read_until operation completes successfully, the buffer
+ * @c b contains the delimiter:
+ * @code { 'a', 'b', ..., 'c', '\n', 'd', 'e', ... } @endcode
+ * The call to @c std::getline then extracts the data up to and including the
+ * delimiter, so that the string @c line contains:
+ * @code { 'a', 'b', ..., 'c', '\n' } @endcode
+ * The remaining data is left in the buffer @c b as follows:
+ * @code { 'd', 'e', ... } @endcode
+ * This data may be the start of a new line, to be extracted by a subsequent
+ * @c async_read_until operation.
+ */
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    char delim, ReadHandler handler);
+
+/// Start an asynchronous operation to read data into a streambuf until it
+/// contains a specified delimiter.
+/**
+ * This function is used to asynchronously read data into the specified
+ * streambuf until the streambuf's get area contains the specified delimiter.
+ * The function call always returns immediately. The asynchronous operation
+ * will continue until one of the following conditions is true:
+ *
+ * @li The get area of the streambuf contains the specified delimiter.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_read_some function, and is known as a <em>composed operation</em>. If
+ * the streambuf's get area already contains the delimiter, this asynchronous
+ * operation completes immediately. The program must ensure that the stream
+ * performs no other read operations (such as async_read, async_read_until, the
+ * stream's async_read_some function, or any other composed operations that
+ * perform reads) until this operation completes.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read. Ownership of
+ * the streambuf is retained by the caller, which must guarantee that it remains
+ * valid until the handler is called.
+ *
+ * @param delim The delimiter string.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // The number of bytes in the streambuf's get
+ *   // area up to and including the delimiter.
+ *   // 0 if an error occurred.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @note After a successful async_read_until operation, the streambuf may
+ * contain additional data beyond the delimiter. An application will typically
+ * leave that data in the streambuf for a subsequent async_read_until operation
+ * to examine.
+ *
+ * @par Example
+ * To asynchronously read data into a streambuf until a newline is encountered:
+ * @code asio::streambuf b;
+ * ...
+ * void handler(const asio::error_code& e, std::size_t size)
+ * {
+ *   if (!e)
+ *   {
+ *     std::istream is(&b);
+ *     std::string line;
+ *     std::getline(is, line);
+ *     ...
+ *   }
+ * }
+ * ...
+ * asio::async_read_until(s, b, "\r\n", handler); @endcode
+ * After the @c async_read_until operation completes successfully, the buffer
+ * @c b contains the delimiter:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
+ * The call to @c std::getline then extracts the data up to and including the
+ * delimiter, so that the string @c line contains:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
+ * The remaining data is left in the buffer @c b as follows:
+ * @code { 'd', 'e', ... } @endcode
+ * This data may be the start of a new line, to be extracted by a subsequent
+ * @c async_read_until operation.
+ */
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const std::string& delim,
+    ReadHandler handler);
+
+/// Start an asynchronous operation to read data into a streambuf until some
+/// part of its data matches a regular expression.
+/**
+ * This function is used to asynchronously read data into the specified
+ * streambuf until the streambuf's get area contains some data that matches a
+ * regular expression. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions
+ * is true:
+ *
+ * @li A substring of the streambuf's get area matches the regular expression.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_read_some function, and is known as a <em>composed operation</em>. If
+ * the streambuf's get area already contains data that matches the regular
+ * expression, this asynchronous operation completes immediately. The program
+ * must ensure that the stream performs no other read operations (such as
+ * async_read, async_read_until, the stream's async_read_some function, or any
+ * other composed operations that perform reads) until this operation
+ * completes.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read. Ownership of
+ * the streambuf is retained by the caller, which must guarantee that it remains
+ * valid until the handler is called.
+ *
+ * @param expr The regular expression.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // The number of bytes in the streambuf's get
+ *   // area up to and including the substring
+ *   // that matches the regular. expression.
+ *   // 0 if an error occurred.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @note After a successful async_read_until operation, the streambuf may
+ * contain additional data beyond that which matched the regular expression. An
+ * application will typically leave that data in the streambuf for a subsequent
+ * async_read_until operation to examine.
+ *
+ * @par Example
+ * To asynchronously read data into a streambuf until a CR-LF sequence is
+ * encountered:
+ * @code asio::streambuf b;
+ * ...
+ * void handler(const asio::error_code& e, std::size_t size)
+ * {
+ *   if (!e)
+ *   {
+ *     std::istream is(&b);
+ *     std::string line;
+ *     std::getline(is, line);
+ *     ...
+ *   }
+ * }
+ * ...
+ * asio::async_read_until(s, b, boost::regex("\r\n"), handler); @endcode
+ * After the @c async_read_until operation completes successfully, the buffer
+ * @c b contains the data which matched the regular expression:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... } @endcode
+ * The call to @c std::getline then extracts the data up to and including the
+ * match, so that the string @c line contains:
+ * @code { 'a', 'b', ..., 'c', '\r', '\n' } @endcode
+ * The remaining data is left in the buffer @c b as follows:
+ * @code { 'd', 'e', ... } @endcode
+ * This data may be the start of a new line, to be extracted by a subsequent
+ * @c async_read_until operation.
+ */
+template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b, const boost::regex& expr,
+    ReadHandler handler);
+
+/// Start an asynchronous operation to read data into a streambuf until a
+/// function object indicates a match.
+/**
+ * This function is used to asynchronously read data into the specified
+ * streambuf until a user-defined match condition function object, when applied
+ * to the data contained in the streambuf, indicates a successful match. The
+ * function call always returns immediately. The asynchronous operation will
+ * continue until one of the following conditions is true:
+ *
+ * @li The match condition function object returns a std::pair where the second
+ * element evaluates to true.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_read_some function, and is known as a <em>composed operation</em>. If
+ * the match condition function object already indicates a match, this
+ * asynchronous operation completes immediately. The program must ensure that
+ * the stream performs no other read operations (such as async_read,
+ * async_read_until, the stream's async_read_some function, or any other
+ * composed operations that perform reads) until this operation completes.
+ *
+ * @param s The stream from which the data is to be read. The type must support
+ * the AsyncReadStream concept.
+ *
+ * @param b A streambuf object into which the data will be read.
+ *
+ * @param match_condition The function object to be called to determine whether
+ * a match exists. The signature of the function object must be:
+ * @code pair<iterator, bool> match_condition(iterator begin, iterator end);
+ * @endcode
+ * where @c iterator represents the type:
+ * @code buffers_iterator<basic_streambuf<Allocator>::const_buffers_type>
+ * @endcode
+ * The iterator parameters @c begin and @c end define the range of bytes to be
+ * scanned to determine whether there is a match. The @c first member of the
+ * return value is an iterator marking one-past-the-end of the bytes that have
+ * been consumed by the match function. This iterator is used to calculate the
+ * @c begin parameter for any subsequent invocation of the match condition. The
+ * @c second member of the return value is true if a match has been found, false
+ * otherwise.
+ *
+ * @param handler The handler to be called when the read operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // The number of bytes in the streambuf's get
+ *   // area that have been fully consumed by the
+ *   // match function. O if an error occurred.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @note After a successful async_read_until operation, the streambuf may
+ * contain additional data beyond that which matched the function object. An
+ * application will typically leave that data in the streambuf for a subsequent
+ * async_read_until operation to examine.
+ *
+ * @note The default implementation of the @c is_match_condition type trait
+ * evaluates to true for function pointers and function objects with a
+ * @c result_type typedef. It must be specialised for other user-defined
+ * function objects.
+ *
+ * @par Examples
+ * To asynchronously read data into a streambuf until whitespace is encountered:
+ * @code typedef asio::buffers_iterator<
+ *     asio::streambuf::const_buffers_type> iterator;
+ *
+ * std::pair<iterator, bool>
+ * match_whitespace(iterator begin, iterator end)
+ * {
+ *   iterator i = begin;
+ *   while (i != end)
+ *     if (std::isspace(*i++))
+ *       return std::make_pair(i, true);
+ *   return std::make_pair(i, false);
+ * }
+ * ...
+ * void handler(const asio::error_code& e, std::size_t size);
+ * ...
+ * asio::streambuf b;
+ * asio::async_read_until(s, b, match_whitespace, handler);
+ * @endcode
+ *
+ * To asynchronously read data into a streambuf until a matching character is
+ * found:
+ * @code class match_char
+ * {
+ * public:
+ *   explicit match_char(char c) : c_(c) {}
+ *
+ *   template <typename Iterator>
+ *   std::pair<Iterator, bool> operator()(
+ *       Iterator begin, Iterator end) const
+ *   {
+ *     Iterator i = begin;
+ *     while (i != end)
+ *       if (c_ == *i++)
+ *         return std::make_pair(i, true);
+ *     return std::make_pair(i, false);
+ *   }
+ *
+ * private:
+ *   char c_;
+ * };
+ *
+ * namespace asio {
+ *   template <> struct is_match_condition<match_char>
+ *     : public boost::true_type {};
+ * } // namespace asio
+ * ...
+ * void handler(const asio::error_code& e, std::size_t size);
+ * ...
+ * asio::streambuf b;
+ * asio::async_read_until(s, b, match_char('a'), handler);
+ * @endcode
+ */
+template <typename AsyncReadStream, typename Allocator,
+    typename MatchCondition, typename ReadHandler>
+void async_read_until(AsyncReadStream& s,
+    asio::basic_streambuf<Allocator>& b,
+    MatchCondition match_condition, ReadHandler handler,
+    typename boost::enable_if<is_match_condition<MatchCondition> >::type* = 0);
+
+/*@}*/
+
+} // namespace asio
+
+#include "asio/impl/read_until.ipp"
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_READ_UNTIL_HPP
diff --git a/ext/asio/serial_port.hpp b/ext/asio/serial_port.hpp
new file mode 100644
index 0000000000..a55a03aa07
--- /dev/null
+++ b/ext/asio/serial_port.hpp
@@ -0,0 +1,38 @@
+//
+// serial_port.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SERIAL_PORT_HPP
+#define ASIO_SERIAL_PORT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_serial_port.hpp"
+
+#if defined(ASIO_HAS_SERIAL_PORT) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+
+/// Typedef for the typical usage of a serial port.
+typedef basic_serial_port<> serial_port;
+
+} // namespace asio
+
+#endif // defined(ASIO_HAS_SERIAL_PORT)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SERIAL_PORT_HPP
diff --git a/ext/asio/serial_port_base.hpp b/ext/asio/serial_port_base.hpp
new file mode 100644
index 0000000000..28e51a08a0
--- /dev/null
+++ b/ext/asio/serial_port_base.hpp
@@ -0,0 +1,173 @@
+//
+// serial_port_base.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SERIAL_PORT_BASE_HPP
+#define ASIO_SERIAL_PORT_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <stdexcept>
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#if !defined(ASIO_DISABLE_SERIAL_PORT)
+# if defined(ASIO_HAS_IOCP) \
+    || !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+#  define ASIO_HAS_SERIAL_PORT 1
+# endif // defined(ASIO_HAS_IOCP)
+#endif // !defined(ASIO_DISABLE_STREAM_HANDLE)
+
+#if defined(ASIO_HAS_SERIAL_PORT) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+# include "asio/detail/push_options.hpp"
+# include <termios.h>
+# include "asio/detail/pop_options.hpp"
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/error_code.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#if defined(GENERATING_DOCUMENTATION)
+# define ASIO_OPTION_STORAGE implementation_defined
+#elif defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+# define ASIO_OPTION_STORAGE DCB
+#else
+# define ASIO_OPTION_STORAGE termios
+#endif
+
+namespace asio {
+
+/// The serial_port_base class is used as a base for the basic_serial_port class
+/// template so that we have a common place to define the serial port options.
+class serial_port_base
+{
+public:
+  /// Serial port option to permit changing the baud rate.
+  /**
+   * Implements changing the baud rate for a given serial port.
+   */
+  class baud_rate
+  {
+  public:
+    explicit baud_rate(unsigned int rate = 0);
+    unsigned int value() const;
+    asio::error_code store(ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec) const;
+    asio::error_code load(const ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec);
+  private:
+    unsigned int value_;
+  };
+
+  /// Serial port option to permit changing the flow control.
+  /**
+   * Implements changing the flow control for a given serial port.
+   */
+  class flow_control
+  {
+  public:
+    enum type { none, software, hardware };
+    explicit flow_control(type t = none);
+    type value() const;
+    asio::error_code store(ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec) const;
+    asio::error_code load(const ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec);
+  private:
+    type value_;
+  };
+
+  /// Serial port option to permit changing the parity.
+  /**
+   * Implements changing the parity for a given serial port.
+   */
+  class parity
+  {
+  public:
+    enum type { none, odd, even };
+    explicit parity(type t = none);
+    type value() const;
+    asio::error_code store(ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec) const;
+    asio::error_code load(const ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec);
+  private:
+    type value_;
+  };
+
+  /// Serial port option to permit changing the number of stop bits.
+  /**
+   * Implements changing the number of stop bits for a given serial port.
+   */
+  class stop_bits
+  {
+  public:
+    enum type { one, onepointfive, two };
+    explicit stop_bits(type t = one);
+    type value() const;
+    asio::error_code store(ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec) const;
+    asio::error_code load(const ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec);
+  private:
+    type value_;
+  };
+
+  /// Serial port option to permit changing the character size.
+  /**
+   * Implements changing the character size for a given serial port.
+   */
+  class character_size
+  {
+  public:
+    explicit character_size(unsigned int t = 8);
+    unsigned int value() const;
+    asio::error_code store(ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec) const;
+    asio::error_code load(const ASIO_OPTION_STORAGE& storage,
+        asio::error_code& ec);
+  private:
+    unsigned int value_;
+  };
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~serial_port_base()
+  {
+  }
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+private:
+  // Workaround to enable the empty base optimisation with Borland C++.
+  char dummy_;
+#endif
+};
+
+} // namespace asio
+
+#include "asio/impl/serial_port_base.ipp"
+
+#undef ASIO_OPTION_STORAGE
+
+#endif // defined(ASIO_HAS_SERIAL_PORT)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SERIAL_PORT_BASE_HPP
diff --git a/ext/asio/serial_port_service.hpp b/ext/asio/serial_port_service.hpp
new file mode 100644
index 0000000000..5847c293f5
--- /dev/null
+++ b/ext/asio/serial_port_service.hpp
@@ -0,0 +1,207 @@
+//
+// serial_port_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SERIAL_PORT_SERVICE_HPP
+#define ASIO_SERIAL_PORT_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/serial_port_base.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/reactive_serial_port_service.hpp"
+#include "asio/detail/win_iocp_serial_port_service.hpp"
+
+#if defined(ASIO_HAS_SERIAL_PORT) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+
+/// Default service implementation for a serial port.
+class serial_port_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<serial_port_service>
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+private:
+  // The type of the platform-specific implementation.
+#if defined(ASIO_HAS_IOCP)
+  typedef detail::win_iocp_serial_port_service service_impl_type;
+#else
+  typedef detail::reactive_serial_port_service service_impl_type;
+#endif
+
+public:
+  /// The type of a serial port implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native handle type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new serial port service for the specified io_service.
+  explicit serial_port_service(asio::io_service& io_service)
+    : asio::detail::service_base<serial_port_service>(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new serial port implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a serial port implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Open a serial port.
+  asio::error_code open(implementation_type& impl,
+      const std::string& device, asio::error_code& ec)
+  {
+    return service_impl_.open(impl, device, ec);
+  }
+
+  /// Assign an existing native handle to a serial port.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_handle, asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, native_handle, ec);
+  }
+
+  /// Determine whether the handle is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Close a serial port implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native handle implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the handle.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Set a serial port option.
+  template <typename SettableSerialPortOption>
+  asio::error_code set_option(implementation_type& impl,
+      const SettableSerialPortOption& option, asio::error_code& ec)
+  {
+    return service_impl_.set_option(impl, option, ec);
+  }
+
+  /// Get a serial port option.
+  template <typename GettableSerialPortOption>
+  asio::error_code get_option(const implementation_type& impl,
+      GettableSerialPortOption& option, asio::error_code& ec) const
+  {
+    return service_impl_.get_option(impl, option, ec);
+  }
+
+  /// Send a break sequence to the serial port.
+  asio::error_code send_break(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.send_break(impl, ec);
+  }
+
+  /// Write the given data to the stream.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.write_some(impl, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    service_impl_.async_write_some(impl, buffers, handler);
+  }
+
+  /// Read some data from the stream.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.read_some(impl, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    service_impl_.async_read_some(impl, buffers, handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace asio
+
+#endif // defined(ASIO_HAS_SERIAL_PORT)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SERIAL_PORT_SERVICE_HPP
diff --git a/ext/asio/socket_acceptor_service.hpp b/ext/asio/socket_acceptor_service.hpp
new file mode 100644
index 0000000000..b2e2c6d2ec
--- /dev/null
+++ b/ext/asio/socket_acceptor_service.hpp
@@ -0,0 +1,217 @@
+//
+// socket_acceptor_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SOCKET_ACCEPTOR_SERVICE_HPP
+#define ASIO_SOCKET_ACCEPTOR_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_socket.hpp"
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_socket_service.hpp"
+#else
+# include "asio/detail/reactive_socket_service.hpp"
+#endif
+
+namespace asio {
+
+/// Default service implementation for a socket acceptor.
+template <typename Protocol>
+class socket_acceptor_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<socket_acceptor_service<Protocol> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename protocol_type::endpoint endpoint_type;
+
+private:
+  // The type of the platform-specific implementation.
+#if defined(ASIO_HAS_IOCP)
+  typedef detail::win_iocp_socket_service<Protocol> service_impl_type;
+#else
+  typedef detail::reactive_socket_service<Protocol> service_impl_type;
+#endif
+
+public:
+  /// The native type of the socket acceptor.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native acceptor type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef typename service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new socket acceptor service for the specified io_service.
+  explicit socket_acceptor_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        socket_acceptor_service<Protocol> >(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new socket acceptor implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a socket acceptor implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Open a new socket acceptor implementation.
+  asio::error_code open(implementation_type& impl,
+      const protocol_type& protocol, asio::error_code& ec)
+  {
+    return service_impl_.open(impl, protocol, ec);
+  }
+
+  /// Assign an existing native acceptor to a socket acceptor.
+  asio::error_code assign(implementation_type& impl,
+      const protocol_type& protocol, const native_type& native_acceptor,
+      asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, protocol, native_acceptor, ec);
+  }
+
+  /// Determine whether the acceptor is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the acceptor.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Bind the socket acceptor to the specified local endpoint.
+  asio::error_code bind(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    return service_impl_.bind(impl, endpoint, ec);
+  }
+
+  /// Place the socket acceptor into the state where it will listen for new
+  /// connections.
+  asio::error_code listen(implementation_type& impl, int backlog,
+      asio::error_code& ec)
+  {
+    return service_impl_.listen(impl, backlog, ec);
+  }
+
+  /// Close a socket acceptor implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native acceptor implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Set a socket option.
+  template <typename SettableSocketOption>
+  asio::error_code set_option(implementation_type& impl,
+      const SettableSocketOption& option, asio::error_code& ec)
+  {
+    return service_impl_.set_option(impl, option, ec);
+  }
+
+  /// Get a socket option.
+  template <typename GettableSocketOption>
+  asio::error_code get_option(const implementation_type& impl,
+      GettableSocketOption& option, asio::error_code& ec) const
+  {
+    return service_impl_.get_option(impl, option, ec);
+  }
+
+  /// Perform an IO control command on the socket.
+  template <typename IoControlCommand>
+  asio::error_code io_control(implementation_type& impl,
+      IoControlCommand& command, asio::error_code& ec)
+  {
+    return service_impl_.io_control(impl, command, ec);
+  }
+
+  /// Get the local endpoint.
+  endpoint_type local_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.local_endpoint(impl, ec);
+  }
+
+  /// Accept a new connection.
+  template <typename SocketService>
+  asio::error_code accept(implementation_type& impl,
+      basic_socket<protocol_type, SocketService>& peer,
+      endpoint_type* peer_endpoint, asio::error_code& ec)
+  {
+    return service_impl_.accept(impl, peer, peer_endpoint, ec);
+  }
+
+  /// Start an asynchronous accept.
+  template <typename SocketService, typename AcceptHandler>
+  void async_accept(implementation_type& impl,
+      basic_socket<protocol_type, SocketService>& peer,
+      endpoint_type* peer_endpoint, AcceptHandler handler)
+  {
+    service_impl_.async_accept(impl, peer, peer_endpoint, handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SOCKET_ACCEPTOR_SERVICE_HPP
diff --git a/ext/asio/socket_base.hpp b/ext/asio/socket_base.hpp
new file mode 100644
index 0000000000..d82cd22e8e
--- /dev/null
+++ b/ext/asio/socket_base.hpp
@@ -0,0 +1,515 @@
+//
+// socket_base.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SOCKET_BASE_HPP
+#define ASIO_SOCKET_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/io_control.hpp"
+#include "asio/detail/socket_option.hpp"
+#include "asio/detail/socket_types.hpp"
+
+namespace asio {
+
+/// The socket_base class is used as a base for the basic_stream_socket and
+/// basic_datagram_socket class templates so that we have a common place to
+/// define the shutdown_type and enum.
+class socket_base
+{
+public:
+  /// Different ways a socket may be shutdown.
+  enum shutdown_type
+  {
+#if defined(GENERATING_DOCUMENTATION)
+    /// Shutdown the receive side of the socket.
+    shutdown_receive = implementation_defined,
+
+    /// Shutdown the send side of the socket.
+    shutdown_send = implementation_defined,
+
+    /// Shutdown both send and receive on the socket.
+    shutdown_both = implementation_defined
+#else
+    shutdown_receive = asio::detail::shutdown_receive,
+    shutdown_send = asio::detail::shutdown_send,
+    shutdown_both = asio::detail::shutdown_both
+#endif
+  };
+
+  /// Bitmask type for flags that can be passed to send and receive operations.
+  typedef int message_flags;
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// Peek at incoming data without removing it from the input queue.
+  static const int message_peek = implementation_defined;
+
+  /// Process out-of-band data.
+  static const int message_out_of_band = implementation_defined;
+
+  /// Specify that the data should not be subject to routing.
+  static const int message_do_not_route = implementation_defined;
+#else
+  BOOST_STATIC_CONSTANT(int,
+      message_peek = asio::detail::message_peek);
+  BOOST_STATIC_CONSTANT(int,
+      message_out_of_band = asio::detail::message_out_of_band);
+  BOOST_STATIC_CONSTANT(int,
+      message_do_not_route = asio::detail::message_do_not_route);
+#endif
+
+  /// Socket option to permit sending of broadcast messages.
+  /**
+   * Implements the SOL_SOCKET/SO_BROADCAST socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::udp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::broadcast option(true);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::udp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::broadcast option;
+   * socket.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined broadcast;
+#else
+  typedef asio::detail::socket_option::boolean<
+    SOL_SOCKET, SO_BROADCAST> broadcast;
+#endif
+
+  /// Socket option to enable socket-level debugging.
+  /**
+   * Implements the SOL_SOCKET/SO_DEBUG socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::debug option(true);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::debug option;
+   * socket.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined debug;
+#else
+  typedef asio::detail::socket_option::boolean<
+    SOL_SOCKET, SO_DEBUG> debug;
+#endif
+
+  /// Socket option to prevent routing, use local interfaces only.
+  /**
+   * Implements the SOL_SOCKET/SO_DONTROUTE socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::udp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::do_not_route option(true);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::udp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::do_not_route option;
+   * socket.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined do_not_route;
+#else
+  typedef asio::detail::socket_option::boolean<
+    SOL_SOCKET, SO_DONTROUTE> do_not_route;
+#endif
+
+  /// Socket option to send keep-alives.
+  /**
+   * Implements the SOL_SOCKET/SO_KEEPALIVE socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::keep_alive option(true);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::keep_alive option;
+   * socket.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined keep_alive;
+#else
+  typedef asio::detail::socket_option::boolean<
+    SOL_SOCKET, SO_KEEPALIVE> keep_alive;
+#endif
+
+  /// Socket option for the send buffer size of a socket.
+  /**
+   * Implements the SOL_SOCKET/SO_SNDBUF socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::send_buffer_size option(8192);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::send_buffer_size option;
+   * socket.get_option(option);
+   * int size = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Integer_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined send_buffer_size;
+#else
+  typedef asio::detail::socket_option::integer<
+    SOL_SOCKET, SO_SNDBUF> send_buffer_size;
+#endif
+
+  /// Socket option for the send low watermark.
+  /**
+   * Implements the SOL_SOCKET/SO_SNDLOWAT socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::send_low_watermark option(1024);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::send_low_watermark option;
+   * socket.get_option(option);
+   * int size = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Integer_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined send_low_watermark;
+#else
+  typedef asio::detail::socket_option::integer<
+    SOL_SOCKET, SO_SNDLOWAT> send_low_watermark;
+#endif
+
+  /// Socket option for the receive buffer size of a socket.
+  /**
+   * Implements the SOL_SOCKET/SO_RCVBUF socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::receive_buffer_size option(8192);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::receive_buffer_size option;
+   * socket.get_option(option);
+   * int size = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Integer_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined receive_buffer_size;
+#else
+  typedef asio::detail::socket_option::integer<
+    SOL_SOCKET, SO_RCVBUF> receive_buffer_size;
+#endif
+
+  /// Socket option for the receive low watermark.
+  /**
+   * Implements the SOL_SOCKET/SO_RCVLOWAT socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::receive_low_watermark option(1024);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::receive_low_watermark option;
+   * socket.get_option(option);
+   * int size = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Integer_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined receive_low_watermark;
+#else
+  typedef asio::detail::socket_option::integer<
+    SOL_SOCKET, SO_RCVLOWAT> receive_low_watermark;
+#endif
+
+  /// Socket option to allow the socket to be bound to an address that is
+  /// already in use.
+  /**
+   * Implements the SOL_SOCKET/SO_REUSEADDR socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service); 
+   * ...
+   * asio::socket_base::reuse_address option(true);
+   * acceptor.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service); 
+   * ...
+   * asio::socket_base::reuse_address option;
+   * acceptor.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined reuse_address;
+#else
+  typedef asio::detail::socket_option::boolean<
+    SOL_SOCKET, SO_REUSEADDR> reuse_address;
+#endif
+
+  /// Socket option to specify whether the socket lingers on close if unsent
+  /// data is present.
+  /**
+   * Implements the SOL_SOCKET/SO_LINGER socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::linger option(true, 30);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::linger option;
+   * socket.get_option(option);
+   * bool is_set = option.enabled();
+   * unsigned short timeout = option.timeout();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Linger_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined linger;
+#else
+  typedef asio::detail::socket_option::linger<
+    SOL_SOCKET, SO_LINGER> linger;
+#endif
+
+  /// Socket option to report aborted connections on accept.
+  /**
+   * Implements a custom socket option that determines whether or not an accept
+   * operation is permitted to fail with asio::error::connection_aborted.
+   * By default the option is false.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service); 
+   * ...
+   * asio::socket_base::enable_connection_aborted option(true);
+   * acceptor.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::acceptor acceptor(io_service); 
+   * ...
+   * asio::socket_base::enable_connection_aborted option;
+   * acceptor.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined enable_connection_aborted;
+#else
+  typedef asio::detail::socket_option::boolean<
+    asio::detail::custom_socket_option_level,
+    asio::detail::enable_connection_aborted_option>
+    enable_connection_aborted;
+#endif
+
+  /// IO control command to set the blocking mode of the socket.
+  /**
+   * Implements the FIONBIO IO control command.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::non_blocking_io command(true);
+   * socket.io_control(command);
+   * @endcode
+   *
+   * @par Concepts:
+   * IO_Control_Command, Boolean_IO_Control_Command.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined non_blocking_io;
+#else
+  typedef asio::detail::io_control::non_blocking_io non_blocking_io;
+#endif
+
+  /// IO control command to get the amount of data that can be read without
+  /// blocking.
+  /**
+   * Implements the FIONREAD IO control command.
+   *
+   * @par Example
+   * @code
+   * asio::ip::tcp::socket socket(io_service); 
+   * ...
+   * asio::socket_base::bytes_readable command(true);
+   * socket.io_control(command);
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   *
+   * @par Concepts:
+   * IO_Control_Command, Size_IO_Control_Command.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined bytes_readable;
+#else
+  typedef asio::detail::io_control::bytes_readable bytes_readable;
+#endif
+
+  /// The maximum length of the queue of pending incoming connections.
+#if defined(GENERATING_DOCUMENTATION)
+  static const int max_connections = implementation_defined;
+#else
+  BOOST_STATIC_CONSTANT(int, max_connections = SOMAXCONN);
+#endif
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~socket_base()
+  {
+  }
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+private:
+  // Workaround to enable the empty base optimisation with Borland C++.
+  char dummy_;
+#endif
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SOCKET_BASE_HPP
diff --git a/ext/asio/ssl.hpp b/ext/asio/ssl.hpp
new file mode 100644
index 0000000000..a9fff5e6ed
--- /dev/null
+++ b/ext/asio/ssl.hpp
@@ -0,0 +1,26 @@
+//
+// ssl.hpp
+// ~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_HPP
+#define ASIO_SSL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/ssl/basic_context.hpp"
+#include "asio/ssl/context.hpp"
+#include "asio/ssl/context_base.hpp"
+#include "asio/ssl/context_service.hpp"
+#include "asio/ssl/stream.hpp"
+#include "asio/ssl/stream_base.hpp"
+#include "asio/ssl/stream_service.hpp"
+
+#endif // ASIO_SSL_HPP
diff --git a/ext/asio/ssl/basic_context.hpp b/ext/asio/ssl/basic_context.hpp
new file mode 100755
index 0000000000..ea3893ed5a
--- /dev/null
+++ b/ext/asio/ssl/basic_context.hpp
@@ -0,0 +1,434 @@
+//
+// basic_context.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_BASIC_CONTEXT_HPP
+#define ASIO_SSL_BASIC_CONTEXT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <string>
+#include <boost/noncopyable.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/ssl/context_base.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// SSL context.
+template <typename Service>
+class basic_context
+  : public context_base,
+    private boost::noncopyable
+{
+public:
+  /// The type of the service that will be used to provide context operations.
+  typedef Service service_type;
+
+  /// The native implementation type of the locking dispatcher.
+  typedef typename service_type::impl_type impl_type;
+
+  /// Constructor.
+  basic_context(asio::io_service& io_service, method m)
+    : service_(asio::use_service<Service>(io_service)),
+      impl_(service_.null())
+  {
+    service_.create(impl_, m);
+  }
+
+  /// Destructor.
+  ~basic_context()
+  {
+    service_.destroy(impl_);
+  }
+
+  /// Get the underlying implementation in the native type.
+  /**
+   * This function may be used to obtain the underlying implementation of the
+   * context. This is intended to allow access to context functionality that is
+   * not otherwise provided.
+   */
+  impl_type impl()
+  {
+    return impl_;
+  }
+
+  /// Set options on the context.
+  /**
+   * This function may be used to configure the SSL options used by the context.
+   *
+   * @param o A bitmask of options. The available option values are defined in
+   * the context_base class. The options are bitwise-ored with any existing
+   * value for the options.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void set_options(options o)
+  {
+    asio::error_code ec;
+    service_.set_options(impl_, o, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Set options on the context.
+  /**
+   * This function may be used to configure the SSL options used by the context.
+   *
+   * @param o A bitmask of options. The available option values are defined in
+   * the context_base class. The options are bitwise-ored with any existing
+   * value for the options.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code set_options(options o,
+      asio::error_code& ec)
+  {
+    return service_.set_options(impl_, o, ec);
+  }
+
+  /// Set the peer verification mode.
+  /**
+   * This function may be used to configure the peer verification mode used by
+   * the context.
+   *
+   * @param v A bitmask of peer verification modes. The available verify_mode
+   * values are defined in the context_base class.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void set_verify_mode(verify_mode v)
+  {
+    asio::error_code ec;
+    service_.set_verify_mode(impl_, v, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Set the peer verification mode.
+  /**
+   * This function may be used to configure the peer verification mode used by
+   * the context.
+   *
+   * @param v A bitmask of peer verification modes. The available verify_mode
+   * values are defined in the context_base class.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code set_verify_mode(verify_mode v,
+      asio::error_code& ec)
+  {
+    return service_.set_verify_mode(impl_, v, ec);
+  }
+
+  /// Load a certification authority file for performing verification.
+  /**
+   * This function is used to load one or more trusted certification authorities
+   * from a file.
+   *
+   * @param filename The name of a file containing certification authority
+   * certificates in PEM format.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void load_verify_file(const std::string& filename)
+  {
+    asio::error_code ec;
+    service_.load_verify_file(impl_, filename, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Load a certification authority file for performing verification.
+  /**
+   * This function is used to load the certificates for one or more trusted
+   * certification authorities from a file.
+   *
+   * @param filename The name of a file containing certification authority
+   * certificates in PEM format.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code load_verify_file(const std::string& filename,
+      asio::error_code& ec)
+  {
+    return service_.load_verify_file(impl_, filename, ec);
+  }
+
+  /// Add a directory containing certificate authority files to be used for
+  /// performing verification.
+  /**
+   * This function is used to specify the name of a directory containing
+   * certification authority certificates. Each file in the directory must
+   * contain a single certificate. The files must be named using the subject
+   * name's hash and an extension of ".0".
+   *
+   * @param path The name of a directory containing the certificates.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void add_verify_path(const std::string& path)
+  {
+    asio::error_code ec;
+    service_.add_verify_path(impl_, path, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Add a directory containing certificate authority files to be used for
+  /// performing verification.
+  /**
+   * This function is used to specify the name of a directory containing
+   * certification authority certificates. Each file in the directory must
+   * contain a single certificate. The files must be named using the subject
+   * name's hash and an extension of ".0".
+   *
+   * @param path The name of a directory containing the certificates.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code add_verify_path(const std::string& path,
+      asio::error_code& ec)
+  {
+    return service_.add_verify_path(impl_, path, ec);
+  }
+
+  /// Use a certificate from a file.
+  /**
+   * This function is used to load a certificate into the context from a file.
+   *
+   * @param filename The name of the file containing the certificate.
+   *
+   * @param format The file format (ASN.1 or PEM).
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void use_certificate_file(const std::string& filename, file_format format)
+  {
+    asio::error_code ec;
+    service_.use_certificate_file(impl_, filename, format, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Use a certificate from a file.
+  /**
+   * This function is used to load a certificate into the context from a file.
+   *
+   * @param filename The name of the file containing the certificate.
+   *
+   * @param format The file format (ASN.1 or PEM).
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code use_certificate_file(const std::string& filename,
+      file_format format, asio::error_code& ec)
+  {
+    return service_.use_certificate_file(impl_, filename, format, ec);
+  }
+
+  /// Use a certificate chain from a file.
+  /**
+   * This function is used to load a certificate chain into the context from a
+   * file.
+   *
+   * @param filename The name of the file containing the certificate. The file
+   * must use the PEM format.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void use_certificate_chain_file(const std::string& filename)
+  {
+    asio::error_code ec;
+    service_.use_certificate_chain_file(impl_, filename, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Use a certificate chain from a file.
+  /**
+   * This function is used to load a certificate chain into the context from a
+   * file.
+   *
+   * @param filename The name of the file containing the certificate. The file
+   * must use the PEM format.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code use_certificate_chain_file(
+      const std::string& filename, asio::error_code& ec)
+  {
+    return service_.use_certificate_chain_file(impl_, filename, ec);
+  }
+
+  /// Use a private key from a file.
+  /**
+   * This function is used to load a private key into the context from a file.
+   *
+   * @param filename The name of the file containing the private key.
+   *
+   * @param format The file format (ASN.1 or PEM).
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void use_private_key_file(const std::string& filename, file_format format)
+  {
+    asio::error_code ec;
+    service_.use_private_key_file(impl_, filename, format, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Use a private key from a file.
+  /**
+   * This function is used to load a private key into the context from a file.
+   *
+   * @param filename The name of the file containing the private key.
+   *
+   * @param format The file format (ASN.1 or PEM).
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code use_private_key_file(const std::string& filename,
+      file_format format, asio::error_code& ec)
+  {
+    return service_.use_private_key_file(impl_, filename, format, ec);
+  }
+
+  /// Use an RSA private key from a file.
+  /**
+   * This function is used to load an RSA private key into the context from a
+   * file.
+   *
+   * @param filename The name of the file containing the RSA private key.
+   *
+   * @param format The file format (ASN.1 or PEM).
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void use_rsa_private_key_file(const std::string& filename, file_format format)
+  {
+    asio::error_code ec;
+    service_.use_rsa_private_key_file(impl_, filename, format, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Use an RSA private key from a file.
+  /**
+   * This function is used to load an RSA private key into the context from a
+   * file.
+   *
+   * @param filename The name of the file containing the RSA private key.
+   *
+   * @param format The file format (ASN.1 or PEM).
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code use_rsa_private_key_file(
+      const std::string& filename, file_format format,
+      asio::error_code& ec)
+  {
+    return service_.use_rsa_private_key_file(impl_, filename, format, ec);
+  }
+
+  /// Use the specified file to obtain the temporary Diffie-Hellman parameters.
+  /**
+   * This function is used to load Diffie-Hellman parameters into the context
+   * from a file.
+   *
+   * @param filename The name of the file containing the Diffie-Hellman
+   * parameters. The file must use the PEM format.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void use_tmp_dh_file(const std::string& filename)
+  {
+    asio::error_code ec;
+    service_.use_tmp_dh_file(impl_, filename, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Use the specified file to obtain the temporary Diffie-Hellman parameters.
+  /**
+   * This function is used to load Diffie-Hellman parameters into the context
+   * from a file.
+   *
+   * @param filename The name of the file containing the Diffie-Hellman
+   * parameters. The file must use the PEM format.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code use_tmp_dh_file(const std::string& filename,
+      asio::error_code& ec)
+  {
+    return service_.use_tmp_dh_file(impl_, filename, ec);
+  }
+
+  /// Set the password callback.
+  /**
+   * This function is used to specify a callback function to obtain password
+   * information about an encrypted key in PEM format.
+   *
+   * @param callback The function object to be used for obtaining the password.
+   * The function signature of the handler must be:
+   * @code std::string password_callback(
+   *   std::size_t max_length,  // The maximum size for a password.
+   *   password_purpose purpose // Whether password is for reading or writing.
+   * ); @endcode
+   * The return value of the callback is a string containing the password.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  template <typename PasswordCallback>
+  void set_password_callback(PasswordCallback callback)
+  {
+    asio::error_code ec;
+    service_.set_password_callback(impl_, callback, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Set the password callback.
+  /**
+   * This function is used to specify a callback function to obtain password
+   * information about an encrypted key in PEM format.
+   *
+   * @param callback The function object to be used for obtaining the password.
+   * The function signature of the handler must be:
+   * @code std::string password_callback(
+   *   std::size_t max_length,  // The maximum size for a password.
+   *   password_purpose purpose // Whether password is for reading or writing.
+   * ); @endcode
+   * The return value of the callback is a string containing the password.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  template <typename PasswordCallback>
+  asio::error_code set_password_callback(PasswordCallback callback,
+      asio::error_code& ec)
+  {
+    return service_.set_password_callback(impl_, callback, ec);
+  }
+
+private:
+  /// The backend service implementation.
+  service_type& service_;
+
+  /// The underlying native implementation.
+  impl_type impl_;
+};
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_BASIC_CONTEXT_HPP
diff --git a/ext/asio/ssl/context.hpp b/ext/asio/ssl/context.hpp
new file mode 100644
index 0000000000..d53882afa9
--- /dev/null
+++ b/ext/asio/ssl/context.hpp
@@ -0,0 +1,35 @@
+//
+// context.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_CONTEXT_HPP
+#define ASIO_SSL_CONTEXT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/ssl/basic_context.hpp"
+#include "asio/ssl/context_service.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// Typedef for the typical usage of context.
+typedef basic_context<context_service> context;
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_CONTEXT_HPP
diff --git a/ext/asio/ssl/context_base.hpp b/ext/asio/ssl/context_base.hpp
new file mode 100755
index 0000000000..a0700ca27a
--- /dev/null
+++ b/ext/asio/ssl/context_base.hpp
@@ -0,0 +1,164 @@
+//
+// context_base.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_CONTEXT_BASE_HPP
+#define ASIO_SSL_CONTEXT_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ssl/detail/openssl_types.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// The context_base class is used as a base for the basic_context class
+/// template so that we have a common place to define various enums.
+class context_base
+{
+public:
+  /// Different methods supported by a context.
+  enum method
+  {
+    /// Generic SSL version 2.
+    sslv2,
+
+    /// SSL version 2 client.
+    sslv2_client,
+
+    /// SSL version 2 server.
+    sslv2_server,
+
+    /// Generic SSL version 3.
+    sslv3,
+
+    /// SSL version 3 client.
+    sslv3_client,
+
+    /// SSL version 3 server.
+    sslv3_server,
+
+    /// Generic TLS version 1.
+    tlsv1,
+
+    /// TLS version 1 client.
+    tlsv1_client,
+
+    /// TLS version 1 server.
+    tlsv1_server,
+
+    /// Generic SSL/TLS.
+    sslv23,
+
+    /// SSL/TLS client.
+    sslv23_client,
+
+    /// SSL/TLS server.
+    sslv23_server
+  };
+
+  /// Bitmask type for SSL options.
+  typedef int options;
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// Implement various bug workarounds.
+  static const int default_workarounds = implementation_defined;
+
+  /// Always create a new key when using tmp_dh parameters.
+  static const int single_dh_use = implementation_defined;
+
+  /// Disable SSL v2.
+  static const int no_sslv2 = implementation_defined;
+
+  /// Disable SSL v3.
+  static const int no_sslv3 = implementation_defined;
+
+  /// Disable TLS v1.
+  static const int no_tlsv1 = implementation_defined;
+#else
+  BOOST_STATIC_CONSTANT(int, default_workarounds = SSL_OP_ALL);
+  BOOST_STATIC_CONSTANT(int, single_dh_use = SSL_OP_SINGLE_DH_USE);
+  BOOST_STATIC_CONSTANT(int, no_sslv2 = SSL_OP_NO_SSLv2);
+  BOOST_STATIC_CONSTANT(int, no_sslv3 = SSL_OP_NO_SSLv3);
+  BOOST_STATIC_CONSTANT(int, no_tlsv1 = SSL_OP_NO_TLSv1);
+#endif
+
+  /// File format types.
+  enum file_format
+  {
+    /// ASN.1 file.
+    asn1,
+
+    /// PEM file.
+    pem
+  };
+
+  /// Bitmask type for peer verification.
+  typedef int verify_mode;
+
+#if defined(GENERATING_DOCUMENTATION)
+  /// No verification.
+  static const int verify_none = implementation_defined;
+
+  /// Verify the peer.
+  static const int verify_peer = implementation_defined;
+
+  /// Fail verification if the peer has no certificate. Ignored unless
+  /// verify_peer is set.
+  static const int verify_fail_if_no_peer_cert = implementation_defined;
+
+  /// Do not request client certificate on renegotiation. Ignored unless
+  /// verify_peer is set.
+  static const int verify_client_once = implementation_defined;
+#else
+  BOOST_STATIC_CONSTANT(int, verify_none = SSL_VERIFY_NONE);
+  BOOST_STATIC_CONSTANT(int, verify_peer = SSL_VERIFY_PEER);
+  BOOST_STATIC_CONSTANT(int,
+      verify_fail_if_no_peer_cert = SSL_VERIFY_FAIL_IF_NO_PEER_CERT);
+  BOOST_STATIC_CONSTANT(int, verify_client_once = SSL_VERIFY_CLIENT_ONCE);
+#endif
+
+  /// Purpose of PEM password.
+  enum password_purpose
+  {
+    /// The password is needed for reading/decryption.
+    for_reading,
+
+    /// The password is needed for writing/encryption.
+    for_writing
+  };
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~context_base()
+  {
+  }
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+private:
+  // Workaround to enable the empty base optimisation with Borland C++.
+  char dummy_;
+#endif
+};
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_CONTEXT_BASE_HPP
diff --git a/ext/asio/ssl/context_service.hpp b/ext/asio/ssl/context_service.hpp
new file mode 100755
index 0000000000..e9cfef7ef2
--- /dev/null
+++ b/ext/asio/ssl/context_service.hpp
@@ -0,0 +1,175 @@
+//
+// context_service.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_CONTEXT_SERVICE_HPP
+#define ASIO_SSL_CONTEXT_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <string>
+#include <boost/noncopyable.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/ssl/context_base.hpp"
+#include "asio/ssl/detail/openssl_context_service.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// Default service implementation for a context.
+class context_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<context_service>
+#endif
+{
+private:
+  // The type of the platform-specific implementation.
+  typedef detail::openssl_context_service service_impl_type;
+
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The type of the context.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined impl_type;
+#else
+  typedef service_impl_type::impl_type impl_type;
+#endif
+
+  /// Constructor.
+  explicit context_service(asio::io_service& io_service)
+    : asio::detail::service_base<context_service>(io_service),
+      service_impl_(asio::use_service<service_impl_type>(io_service))
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  /// Return a null context implementation.
+  impl_type null() const
+  {
+    return service_impl_.null();
+  }
+
+  /// Create a new context implementation.
+  void create(impl_type& impl, context_base::method m)
+  {
+    service_impl_.create(impl, m);
+  }
+
+  /// Destroy a context implementation.
+  void destroy(impl_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Set options on the context.
+  asio::error_code set_options(impl_type& impl,
+      context_base::options o, asio::error_code& ec)
+  {
+    return service_impl_.set_options(impl, o, ec);
+  }
+
+  /// Set peer verification mode.
+  asio::error_code set_verify_mode(impl_type& impl,
+      context_base::verify_mode v, asio::error_code& ec)
+  {
+    return service_impl_.set_verify_mode(impl, v, ec);
+  }
+
+  /// Load a certification authority file for performing verification.
+  asio::error_code load_verify_file(impl_type& impl,
+      const std::string& filename, asio::error_code& ec)
+  {
+    return service_impl_.load_verify_file(impl, filename, ec);
+  }
+
+  /// Add a directory containing certification authority files to be used for
+  /// performing verification.
+  asio::error_code add_verify_path(impl_type& impl,
+      const std::string& path, asio::error_code& ec)
+  {
+    return service_impl_.add_verify_path(impl, path, ec);
+  }
+
+  /// Use a certificate from a file.
+  asio::error_code use_certificate_file(impl_type& impl,
+      const std::string& filename, context_base::file_format format,
+      asio::error_code& ec)
+  {
+    return service_impl_.use_certificate_file(impl, filename, format, ec);
+  }
+
+  /// Use a certificate chain from a file.
+  asio::error_code use_certificate_chain_file(impl_type& impl,
+      const std::string& filename, asio::error_code& ec)
+  {
+    return service_impl_.use_certificate_chain_file(impl, filename, ec);
+  }
+
+  /// Use a private key from a file.
+  asio::error_code use_private_key_file(impl_type& impl,
+      const std::string& filename, context_base::file_format format,
+      asio::error_code& ec)
+  {
+    return service_impl_.use_private_key_file(impl, filename, format, ec);
+  }
+
+  /// Use an RSA private key from a file.
+  asio::error_code use_rsa_private_key_file(impl_type& impl,
+      const std::string& filename, context_base::file_format format,
+      asio::error_code& ec)
+  {
+    return service_impl_.use_rsa_private_key_file(impl, filename, format, ec);
+  }
+
+  /// Use the specified file to obtain the temporary Diffie-Hellman parameters.
+  asio::error_code use_tmp_dh_file(impl_type& impl,
+      const std::string& filename, asio::error_code& ec)
+  {
+    return service_impl_.use_tmp_dh_file(impl, filename, ec);
+  }
+
+  /// Set the password callback.
+  template <typename PasswordCallback>
+  asio::error_code set_password_callback(impl_type& impl,
+      PasswordCallback callback, asio::error_code& ec)
+  {
+    return service_impl_.set_password_callback(impl, callback, ec);
+  }
+
+private:
+  // The service that provides the platform-specific implementation.
+  service_impl_type& service_impl_;
+};
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_CONTEXT_SERVICE_HPP
diff --git a/ext/asio/ssl/detail/openssl_context_service.hpp b/ext/asio/ssl/detail/openssl_context_service.hpp
new file mode 100755
index 0000000000..a3d4fdb54c
--- /dev/null
+++ b/ext/asio/ssl/detail/openssl_context_service.hpp
@@ -0,0 +1,378 @@
+//
+// openssl_context_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_OPENSSL_CONTEXT_SERVICE_HPP
+#define ASIO_SSL_DETAIL_OPENSSL_CONTEXT_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstring>
+#include <string>
+#include <boost/function.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/ssl/context_base.hpp"
+#include "asio/ssl/detail/openssl_init.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class openssl_context_service
+  : public asio::detail::service_base<openssl_context_service>
+{
+public:
+  // The native type of the context.
+  typedef ::SSL_CTX* impl_type;
+
+  // The type for the password callback function object.
+  typedef boost::function<std::string(std::size_t,
+      context_base::password_purpose)> password_callback_type;
+
+  // Constructor.
+  openssl_context_service(asio::io_service& io_service)
+    : asio::detail::service_base<openssl_context_service>(io_service)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  // Return a null context implementation.
+  static impl_type null()
+  {
+    return 0;
+  }
+
+  // Create a new context implementation.
+  void create(impl_type& impl, context_base::method m)
+  {
+    switch (m)
+    {
+    case context_base::sslv2:
+      impl = ::SSL_CTX_new(::SSLv2_method());
+      break;
+    case context_base::sslv2_client:
+      impl = ::SSL_CTX_new(::SSLv2_client_method());
+      break;
+    case context_base::sslv2_server:
+      impl = ::SSL_CTX_new(::SSLv2_server_method());
+      break;
+    case context_base::sslv3:
+      impl = ::SSL_CTX_new(::SSLv3_method());
+      break;
+    case context_base::sslv3_client:
+      impl = ::SSL_CTX_new(::SSLv3_client_method());
+      break;
+    case context_base::sslv3_server:
+      impl = ::SSL_CTX_new(::SSLv3_server_method());
+      break;
+    case context_base::tlsv1:
+      impl = ::SSL_CTX_new(::TLSv1_method());
+      break;
+    case context_base::tlsv1_client:
+      impl = ::SSL_CTX_new(::TLSv1_client_method());
+      break;
+    case context_base::tlsv1_server:
+      impl = ::SSL_CTX_new(::TLSv1_server_method());
+      break;
+    case context_base::sslv23:
+      impl = ::SSL_CTX_new(::SSLv23_method());
+      break;
+    case context_base::sslv23_client:
+      impl = ::SSL_CTX_new(::SSLv23_client_method());
+      break;
+    case context_base::sslv23_server:
+      impl = ::SSL_CTX_new(::SSLv23_server_method());
+      break;
+    default:
+      impl = ::SSL_CTX_new(0);
+      break;
+    }
+  }
+
+  // Destroy a context implementation.
+  void destroy(impl_type& impl)
+  {
+    if (impl != null())
+    {
+      if (impl->default_passwd_callback_userdata)
+      {
+        password_callback_type* callback =
+          static_cast<password_callback_type*>(
+              impl->default_passwd_callback_userdata);
+        delete callback;
+        impl->default_passwd_callback_userdata = 0;
+      }
+
+      ::SSL_CTX_free(impl);
+      impl = null();
+    }
+  }
+
+  // Set options on the context.
+  asio::error_code set_options(impl_type& impl,
+      context_base::options o, asio::error_code& ec)
+  {
+    ::SSL_CTX_set_options(impl, o);
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Set peer verification mode.
+  asio::error_code set_verify_mode(impl_type& impl,
+      context_base::verify_mode v, asio::error_code& ec)
+  {
+    ::SSL_CTX_set_verify(impl, v, 0);
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Load a certification authority file for performing verification.
+  asio::error_code load_verify_file(impl_type& impl,
+      const std::string& filename, asio::error_code& ec)
+  {
+    if (::SSL_CTX_load_verify_locations(impl, filename.c_str(), 0) != 1)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Add a directory containing certification authority files to be used for
+  // performing verification.
+  asio::error_code add_verify_path(impl_type& impl,
+      const std::string& path, asio::error_code& ec)
+  {
+    if (::SSL_CTX_load_verify_locations(impl, 0, path.c_str()) != 1)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Use a certificate from a file.
+  asio::error_code use_certificate_file(impl_type& impl,
+      const std::string& filename, context_base::file_format format,
+      asio::error_code& ec)
+  {
+    int file_type;
+    switch (format)
+    {
+    case context_base::asn1:
+      file_type = SSL_FILETYPE_ASN1;
+      break;
+    case context_base::pem:
+      file_type = SSL_FILETYPE_PEM;
+      break;
+    default:
+      {
+        ec = asio::error::invalid_argument;
+        return ec;
+      }
+    }
+
+    if (::SSL_CTX_use_certificate_file(impl, filename.c_str(), file_type) != 1)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Use a certificate chain from a file.
+  asio::error_code use_certificate_chain_file(impl_type& impl,
+      const std::string& filename, asio::error_code& ec)
+  {
+    if (::SSL_CTX_use_certificate_chain_file(impl, filename.c_str()) != 1)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Use a private key from a file.
+  asio::error_code use_private_key_file(impl_type& impl,
+      const std::string& filename, context_base::file_format format,
+      asio::error_code& ec)
+  {
+    int file_type;
+    switch (format)
+    {
+    case context_base::asn1:
+      file_type = SSL_FILETYPE_ASN1;
+      break;
+    case context_base::pem:
+      file_type = SSL_FILETYPE_PEM;
+      break;
+    default:
+      {
+        ec = asio::error::invalid_argument;
+        return ec;
+      }
+    }
+
+    if (::SSL_CTX_use_PrivateKey_file(impl, filename.c_str(), file_type) != 1)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Use an RSA private key from a file.
+  asio::error_code use_rsa_private_key_file(impl_type& impl,
+      const std::string& filename, context_base::file_format format,
+      asio::error_code& ec)
+  {
+    int file_type;
+    switch (format)
+    {
+    case context_base::asn1:
+      file_type = SSL_FILETYPE_ASN1;
+      break;
+    case context_base::pem:
+      file_type = SSL_FILETYPE_PEM;
+      break;
+    default:
+      {
+        ec = asio::error::invalid_argument;
+        return ec;
+      }
+    }
+
+    if (::SSL_CTX_use_RSAPrivateKey_file(
+          impl, filename.c_str(), file_type) != 1)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Use the specified file to obtain the temporary Diffie-Hellman parameters.
+  asio::error_code use_tmp_dh_file(impl_type& impl,
+      const std::string& filename, asio::error_code& ec)
+  {
+    ::BIO* bio = ::BIO_new_file(filename.c_str(), "r");
+    if (!bio)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ::DH* dh = ::PEM_read_bio_DHparams(bio, 0, 0, 0);
+    if (!dh)
+    {
+      ::BIO_free(bio);
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ::BIO_free(bio);
+    int result = ::SSL_CTX_set_tmp_dh(impl, dh);
+    ::DH_free(dh);
+    if (result != 1)
+    {
+      ec = asio::error::invalid_argument;
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  static int password_callback(char* buf, int size, int purpose, void* data)
+  {
+    using namespace std; // For strncat and strlen.
+
+    if (data)
+    {
+      password_callback_type* callback =
+        static_cast<password_callback_type*>(data);
+      std::string passwd = (*callback)(static_cast<std::size_t>(size),
+          purpose ? context_base::for_writing : context_base::for_reading);
+      *buf = '\0';
+      strncat(buf, passwd.c_str(), size);
+      return strlen(buf);
+    }
+
+    return 0;
+  }
+
+  // Set the password callback.
+  template <typename Password_Callback>
+  asio::error_code set_password_callback(impl_type& impl,
+      Password_Callback callback, asio::error_code& ec)
+  {
+    // Allocate callback function object if not already present.
+    if (impl->default_passwd_callback_userdata)
+    {
+      password_callback_type* callback_function =
+        static_cast<password_callback_type*>(
+            impl->default_passwd_callback_userdata);
+      *callback_function = callback;
+    }
+    else
+    {
+      password_callback_type* callback_function =
+        new password_callback_type(callback);
+      impl->default_passwd_callback_userdata = callback_function;
+    }
+
+    // Set the password callback.
+    SSL_CTX_set_default_passwd_cb(impl,
+        &openssl_context_service::password_callback);
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+private:
+  // Ensure openssl is initialised.
+  openssl_init<> init_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_OPENSSL_CONTEXT_SERVICE_HPP
diff --git a/ext/asio/ssl/detail/openssl_init.hpp b/ext/asio/ssl/detail/openssl_init.hpp
new file mode 100755
index 0000000000..9ecbb78ffd
--- /dev/null
+++ b/ext/asio/ssl/detail/openssl_init.hpp
@@ -0,0 +1,155 @@
+//
+// openssl_init.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
+#define ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstring>
+#include <vector>
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/shared_ptr.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/tss_ptr.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+template <bool Do_Init = true>
+class openssl_init
+  : private boost::noncopyable
+{
+private:
+  // Structure to perform the actual initialisation.
+  class do_init
+  {
+  public:
+    do_init()
+    {
+      if (Do_Init)
+      {
+        ::SSL_library_init();
+        ::SSL_load_error_strings();        
+        ::OpenSSL_add_ssl_algorithms();
+
+        mutexes_.resize(::CRYPTO_num_locks());
+        for (size_t i = 0; i < mutexes_.size(); ++i)
+          mutexes_[i].reset(new asio::detail::mutex);
+        ::CRYPTO_set_locking_callback(&do_init::openssl_locking_func);
+        ::CRYPTO_set_id_callback(&do_init::openssl_id_func);
+      }
+    }
+
+    ~do_init()
+    {
+      if (Do_Init)
+      {
+        ::CRYPTO_set_id_callback(0);
+        ::CRYPTO_set_locking_callback(0);
+        ::ERR_free_strings();
+        ::ERR_remove_state(0);
+        ::EVP_cleanup();
+        ::CRYPTO_cleanup_all_ex_data();
+        ::CONF_modules_unload(1);
+        ::ENGINE_cleanup();
+      }
+    }
+
+    // Helper function to manage a do_init singleton. The static instance of the
+    // openssl_init object ensures that this function is always called before
+    // main, and therefore before any other threads can get started. The do_init
+    // instance must be static in this function to ensure that it gets
+    // initialised before any other global objects try to use it.
+    static boost::shared_ptr<do_init> instance()
+    {
+      static boost::shared_ptr<do_init> init(new do_init);
+      return init;
+    }
+
+  private:
+    static unsigned long openssl_id_func()
+    {
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+      return ::GetCurrentThreadId();
+#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+      void* id = instance()->thread_id_;
+      if (id == 0)
+        instance()->thread_id_ = id = &id; // Ugh.
+      BOOST_ASSERT(sizeof(unsigned long) >= sizeof(void*));
+      return reinterpret_cast<unsigned long>(id);
+#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+    }
+
+    static void openssl_locking_func(int mode, int n, 
+      const char* /*file*/, int /*line*/)
+    {
+      if (mode & CRYPTO_LOCK)
+        instance()->mutexes_[n]->lock();
+      else
+        instance()->mutexes_[n]->unlock();
+    }
+
+    // Mutexes to be used in locking callbacks.
+    std::vector<boost::shared_ptr<asio::detail::mutex> > mutexes_;
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+    // The thread identifiers to be used by openssl.
+    asio::detail::tss_ptr<void> thread_id_;
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+  };
+
+public:
+  // Constructor.
+  openssl_init()
+    : ref_(do_init::instance())
+  {
+    using namespace std; // For memmove.
+
+    // Ensure openssl_init::instance_ is linked in.
+    openssl_init* tmp = &instance_;
+    memmove(&tmp, &tmp, sizeof(openssl_init*));
+  }
+
+  // Destructor.
+  ~openssl_init()
+  {
+  }
+
+private:
+  // Instance to force initialisation of openssl at global scope.
+  static openssl_init instance_;
+
+  // Reference to singleton do_init object to ensure that openssl does not get
+  // cleaned up until the last user has finished with it.
+  boost::shared_ptr<do_init> ref_;
+};
+
+template <bool Do_Init>
+openssl_init<Do_Init> openssl_init<Do_Init>::instance_;
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
diff --git a/ext/asio/ssl/detail/openssl_operation.hpp b/ext/asio/ssl/detail/openssl_operation.hpp
new file mode 100755
index 0000000000..8d237e3616
--- /dev/null
+++ b/ext/asio/ssl/detail/openssl_operation.hpp
@@ -0,0 +1,521 @@
+//
+// openssl_operation.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_OPENSSL_OPERATION_HPP
+#define ASIO_SSL_DETAIL_OPENSSL_OPERATION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/function.hpp>
+#include <boost/assert.hpp>
+#include <boost/bind.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/placeholders.hpp"
+#include "asio/write.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+typedef boost::function<int (::SSL*)> ssl_primitive_func; 
+typedef boost::function<void (const asio::error_code&, int)>
+  user_handler_func;
+
+// Network send_/recv buffer implementation
+//
+//
+class net_buffer
+{
+  static const int  NET_BUF_SIZE = 16*1024 + 256; // SSL record size + spare
+
+  unsigned char buf_[NET_BUF_SIZE];
+  unsigned char* data_start_;
+  unsigned char* data_end_;
+
+public:
+  net_buffer()
+  {
+    data_start_ = data_end_ = buf_;
+  }
+  unsigned char* get_unused_start() { return data_end_; }
+  unsigned char* get_data_start() { return data_start_; }
+  size_t get_unused_len() { return (NET_BUF_SIZE - (data_end_ - buf_)); }    
+  size_t get_data_len() { return (data_end_ - data_start_); }    
+  void data_added(size_t count)
+  { 
+    data_end_ += count; 
+    data_end_ = data_end_ > (buf_ + NET_BUF_SIZE)? 
+      (buf_ + NET_BUF_SIZE):
+      data_end_; 
+  }
+  void data_removed(size_t count) 
+  { 
+    data_start_ += count; 
+    if (data_start_ >= data_end_) reset(); 
+  }
+  void reset() { data_start_ = buf_; data_end_ = buf_; }               
+  bool has_data() { return (data_start_ < data_end_); }
+}; // class net_buffer
+
+//
+// Operation class
+//
+//
+template <typename Stream>
+class openssl_operation
+{
+public:
+
+  // Constructor for asynchronous operations
+  openssl_operation(ssl_primitive_func primitive,
+                    Stream& socket,
+                    net_buffer& recv_buf,
+                    SSL* session,
+                    BIO* ssl_bio,
+                    user_handler_func  handler,
+                    asio::io_service::strand& strand
+                    )
+    : primitive_(primitive)
+    , user_handler_(handler)
+    , strand_(&strand)
+    , recv_buf_(recv_buf)
+    , socket_(socket)
+    , ssl_bio_(ssl_bio)
+    , session_(session)
+  {
+    write_ = boost::bind(
+      &openssl_operation::do_async_write, 
+      this, boost::arg<1>(), boost::arg<2>()
+    );
+    read_ = boost::bind(
+      &openssl_operation::do_async_read, 
+      this
+    );
+    handler_= boost::bind(
+      &openssl_operation::async_user_handler, 
+      this, boost::arg<1>(), boost::arg<2>()
+    );
+  }
+
+  // Constructor for synchronous operations
+  openssl_operation(ssl_primitive_func primitive,
+                    Stream& socket,
+                    net_buffer& recv_buf,
+                    SSL* session,
+                    BIO* ssl_bio)
+    : primitive_(primitive)
+    , strand_(0)
+    , recv_buf_(recv_buf)
+    , socket_(socket)
+    , ssl_bio_(ssl_bio)
+    , session_(session)
+  {      
+    write_ = boost::bind(
+      &openssl_operation::do_sync_write, 
+      this, boost::arg<1>(), boost::arg<2>()
+    );
+    read_ = boost::bind(
+      &openssl_operation::do_sync_read, 
+      this
+    );
+    handler_ = boost::bind(
+      &openssl_operation::sync_user_handler, 
+      this, boost::arg<1>(), boost::arg<2>()
+      );
+  }
+
+  // Start operation
+  // In case of asynchronous it returns 0, in sync mode returns success code
+  // or throws an error...
+  int start()
+  {
+    int rc = primitive_( session_ );
+
+    bool is_operation_done = (rc > 0);  
+                // For connect/accept/shutdown, the operation
+                // is done, when return code is 1
+                // for write, it is done, when is retcode > 0
+                // for read, is is done when retcode > 0
+
+    int error_code =  !is_operation_done ?
+          ::SSL_get_error( session_, rc ) :
+          0;        
+    int sys_error_code = ERR_get_error();
+
+    if (error_code == SSL_ERROR_SSL)
+      return handler_(asio::error_code(
+            error_code, asio::error::get_ssl_category()), rc);
+
+    bool is_read_needed = (error_code == SSL_ERROR_WANT_READ);
+    bool is_write_needed = (error_code == SSL_ERROR_WANT_WRITE ||
+                              ::BIO_ctrl_pending( ssl_bio_ ));
+    bool is_shut_down_received = 
+      ((::SSL_get_shutdown( session_ ) & SSL_RECEIVED_SHUTDOWN) == 
+          SSL_RECEIVED_SHUTDOWN);
+    bool is_shut_down_sent = 
+      ((::SSL_get_shutdown( session_ ) & SSL_SENT_SHUTDOWN) ==
+            SSL_SENT_SHUTDOWN);
+
+    if (is_shut_down_sent && is_shut_down_received
+        && is_operation_done && !is_write_needed)
+      // SSL connection is shut down cleanly
+      return handler_(asio::error_code(), 1);
+
+    if (is_shut_down_received && !is_operation_done)
+      // Shutdown has been requested, while we were reading or writing...
+      // abort our action...
+      return handler_(asio::error::shut_down, 0);
+
+    if (!is_operation_done && !is_read_needed && !is_write_needed 
+      && !is_shut_down_sent)
+    {
+      // The operation has failed... It is not completed and does 
+      // not want network communication nor does want to send shutdown out...
+      if (error_code == SSL_ERROR_SYSCALL)
+      {
+        return handler_(asio::error_code(
+              sys_error_code, asio::error::system_category), rc); 
+      }
+      else
+      {
+        return handler_(asio::error_code(
+              error_code, asio::error::get_ssl_category()), rc); 
+      }
+    }
+
+    if (!is_operation_done && !is_write_needed)
+    {
+      // We may have left over data that we can pass to SSL immediately
+      if (recv_buf_.get_data_len() > 0)
+      {
+        // Pass the buffered data to SSL
+        int written = ::BIO_write
+        ( 
+          ssl_bio_, 
+          recv_buf_.get_data_start(), 
+          recv_buf_.get_data_len() 
+        );
+
+        if (written > 0)
+        {
+          recv_buf_.data_removed(written);
+        }
+        else if (written < 0)
+        {
+          if (!BIO_should_retry(ssl_bio_))
+          {
+            // Some serios error with BIO....
+            return handler_(asio::error::no_recovery, 0);
+          }
+        }
+
+        return start();
+      }
+      else if (is_read_needed || (is_shut_down_sent && !is_shut_down_received))
+      {
+        return read_();
+      }
+    }
+
+    // Continue with operation, flush any SSL data out to network...
+    return write_(is_operation_done, rc); 
+  }
+
+// Private implementation
+private:
+  typedef boost::function<int (const asio::error_code&, int)>
+    int_handler_func;
+  typedef boost::function<int (bool, int)> write_func;
+  typedef boost::function<int ()> read_func;
+
+  ssl_primitive_func  primitive_;
+  user_handler_func  user_handler_;
+  asio::io_service::strand* strand_;
+  write_func  write_;
+  read_func  read_;
+  int_handler_func handler_;
+    
+  net_buffer send_buf_; // buffers for network IO
+
+  // The recv buffer is owned by the stream, not the operation, since there can
+  // be left over bytes after passing the data up to the application, and these
+  // bytes need to be kept around for the next read operation issued by the
+  // application.
+  net_buffer& recv_buf_;
+
+  Stream& socket_;
+  BIO*    ssl_bio_;
+  SSL*    session_;
+
+  //
+  int sync_user_handler(const asio::error_code& error, int rc)
+  {
+    if (!error)
+      return rc;
+
+    throw asio::system_error(error);
+  }
+    
+  int async_user_handler(asio::error_code error, int rc)
+  {
+    if (rc < 0)
+    {
+      if (!error)
+        error = asio::error::no_recovery;
+      rc = 0;
+    }
+
+    user_handler_(error, rc);
+    return 0;
+  }
+
+  // Writes bytes asynchronously from SSL to NET
+  int  do_async_write(bool is_operation_done, int rc) 
+  {
+    int len = ::BIO_ctrl_pending( ssl_bio_ );
+    if ( len )
+    { 
+      // There is something to write into net, do it...
+      len = (int)send_buf_.get_unused_len() > len? 
+        len: 
+        send_buf_.get_unused_len();
+        
+      if (len == 0)
+      {
+        // In case our send buffer is full, we have just to wait until 
+        // previous send to complete...
+        return 0;
+      }
+
+      // Read outgoing data from bio
+      len = ::BIO_read( ssl_bio_, send_buf_.get_unused_start(), len); 
+         
+      if (len > 0)
+      {
+        unsigned char *data_start = send_buf_.get_unused_start();
+        send_buf_.data_added(len);
+ 
+        BOOST_ASSERT(strand_); 
+        asio::async_write
+        ( 
+          socket_, 
+          asio::buffer(data_start, len),
+          strand_->wrap
+          (
+            boost::bind
+            (
+              &openssl_operation::async_write_handler, 
+              this, 
+              is_operation_done,
+              rc, 
+              asio::placeholders::error, 
+              asio::placeholders::bytes_transferred
+            )
+          )
+        );
+                  
+        return 0;
+      }
+      else if (!BIO_should_retry(ssl_bio_))
+      {
+        // Seems like fatal error
+        // reading from SSL BIO has failed...
+        handler_(asio::error::no_recovery, 0);
+        return 0;
+      }
+    }
+    
+    if (is_operation_done)
+    {
+      // Finish the operation, with success
+      handler_(asio::error_code(), rc);
+      return 0;
+    }
+    
+    // OPeration is not done and writing to net has been made...
+    // start operation again
+    start();
+          
+    return 0;
+  }
+
+  void async_write_handler(bool is_operation_done, int rc, 
+    const asio::error_code& error, size_t bytes_sent)
+  {
+    if (!error)
+    {
+      // Remove data from send buffer
+      send_buf_.data_removed(bytes_sent);
+
+      if (is_operation_done)
+        handler_(asio::error_code(), rc);
+      else
+        // Since the operation was not completed, try it again...
+        start();
+    }
+    else 
+      handler_(error, rc);
+  }
+
+  int do_async_read()
+  {
+    // Wait for new data
+    BOOST_ASSERT(strand_);
+    socket_.async_read_some
+    ( 
+      asio::buffer(recv_buf_.get_unused_start(),
+        recv_buf_.get_unused_len()),
+      strand_->wrap
+      (
+        boost::bind
+        (
+          &openssl_operation::async_read_handler, 
+          this, 
+          asio::placeholders::error, 
+          asio::placeholders::bytes_transferred
+        )
+      )
+    );
+    return 0;
+  }
+
+  void async_read_handler(const asio::error_code& error,
+      size_t bytes_recvd)
+  {
+    if (!error)
+    {
+      recv_buf_.data_added(bytes_recvd);
+
+      // Pass the received data to SSL
+      int written = ::BIO_write
+      ( 
+        ssl_bio_, 
+        recv_buf_.get_data_start(), 
+        recv_buf_.get_data_len() 
+      );
+
+      if (written > 0)
+      {
+        recv_buf_.data_removed(written);
+      }
+      else if (written < 0)
+      {
+        if (!BIO_should_retry(ssl_bio_))
+        {
+          // Some serios error with BIO....
+          handler_(asio::error::no_recovery, 0);
+          return;
+        }
+      }
+
+      // and try the SSL primitive again
+      start();
+    }
+    else
+    {
+      // Error in network level...
+      // SSL can't continue either...
+      handler_(error, 0);
+    }
+  }
+
+  // Syncronous functions...
+  int do_sync_write(bool is_operation_done, int rc)
+  {
+    int len = ::BIO_ctrl_pending( ssl_bio_ );
+    if ( len )
+    { 
+      // There is something to write into net, do it...
+      len = (int)send_buf_.get_unused_len() > len? 
+        len: 
+        send_buf_.get_unused_len();
+        
+      // Read outgoing data from bio
+      len = ::BIO_read( ssl_bio_, send_buf_.get_unused_start(), len); 
+         
+      if (len > 0)
+      {
+        size_t sent_len = asio::write( 
+                  socket_, 
+                  asio::buffer(send_buf_.get_unused_start(), len)
+                  );
+
+        send_buf_.data_added(len);
+        send_buf_.data_removed(sent_len);
+      }          
+      else if (!BIO_should_retry(ssl_bio_))
+      {
+        // Seems like fatal error
+        // reading from SSL BIO has failed...
+        throw asio::system_error(asio::error::no_recovery);
+      }
+    }
+    
+    if (is_operation_done)
+      // Finish the operation, with success
+      return rc;
+                
+    // Operation is not finished, start again.
+    return start();
+  }
+
+  int do_sync_read()
+  {
+    size_t len = socket_.read_some
+      ( 
+        asio::buffer(recv_buf_.get_unused_start(),
+          recv_buf_.get_unused_len())
+      );
+
+    // Write data to ssl
+    recv_buf_.data_added(len);
+
+    // Pass the received data to SSL
+    int written = ::BIO_write
+    ( 
+      ssl_bio_, 
+      recv_buf_.get_data_start(), 
+      recv_buf_.get_data_len() 
+    );
+
+    if (written > 0)
+    {
+      recv_buf_.data_removed(written);
+    }
+    else if (written < 0)
+    {
+      if (!BIO_should_retry(ssl_bio_))
+      {
+        // Some serios error with BIO....
+        throw asio::system_error(asio::error::no_recovery);
+      }
+    }
+
+    // Try the operation again
+    return start();
+  }
+}; // class openssl_operation
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_OPENSSL_OPERATION_HPP
diff --git a/ext/asio/ssl/detail/openssl_stream_service.hpp b/ext/asio/ssl/detail/openssl_stream_service.hpp
new file mode 100644
index 0000000000..d7bb457a9e
--- /dev/null
+++ b/ext/asio/ssl/detail/openssl_stream_service.hpp
@@ -0,0 +1,571 @@
+//
+// stream_service.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_OPENSSL_STREAM_SERVICE_HPP
+#define ASIO_SSL_DETAIL_OPENSSL_STREAM_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <climits>
+#include <memory>
+#include <boost/config.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/function.hpp>
+#include <boost/bind.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/strand.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/ssl/basic_context.hpp"
+#include "asio/ssl/stream_base.hpp"
+#include "asio/ssl/detail/openssl_operation.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class openssl_stream_service
+  : public asio::detail::service_base<openssl_stream_service>
+{
+private:
+  enum { max_buffer_size = INT_MAX };
+
+  //Base handler for asyncrhonous operations
+  template <typename Stream>
+  class base_handler
+  {
+  public:
+    typedef boost::function<
+      void (const asio::error_code&, size_t)> func_t;
+
+    base_handler(asio::io_service& io_service)
+      : op_(NULL)
+      , io_service_(io_service)
+      , work_(io_service)
+    {}
+    
+    void do_func(const asio::error_code& error, size_t size)
+    {
+      func_(error, size);
+    }
+        
+    void set_operation(openssl_operation<Stream>* op) { op_ = op; }
+    void set_func(func_t func) { func_ = func; }
+
+    ~base_handler()
+    {
+      delete op_;
+    }
+
+  private:
+    func_t func_;
+    openssl_operation<Stream>* op_;
+    asio::io_service& io_service_;
+    asio::io_service::work work_;
+  };  // class base_handler
+
+  // Handler for asynchronous IO (write/read) operations
+  template<typename Stream, typename Handler>
+  class io_handler 
+    : public base_handler<Stream>
+  {
+  public:
+    io_handler(Handler handler, asio::io_service& io_service)
+      : base_handler<Stream>(io_service)
+      , handler_(handler)
+    {
+      set_func(boost::bind(
+        &io_handler<Stream, Handler>::handler_impl, 
+        this, boost::arg<1>(), boost::arg<2>() ));
+    }
+
+  private:
+    Handler handler_;
+    void handler_impl(const asio::error_code& error, size_t size)
+    {
+      std::auto_ptr<io_handler<Stream, Handler> > this_ptr(this);
+      handler_(error, size);
+    }
+  };  // class io_handler 
+
+  // Handler for asyncrhonous handshake (connect, accept) functions
+  template <typename Stream, typename Handler>
+  class handshake_handler
+    : public base_handler<Stream>
+  {
+  public:
+    handshake_handler(Handler handler, asio::io_service& io_service)
+      : base_handler<Stream>(io_service)
+      , handler_(handler)
+    {
+      set_func(boost::bind(
+        &handshake_handler<Stream, Handler>::handler_impl, 
+        this, boost::arg<1>(), boost::arg<2>() ));
+    }
+
+  private:
+    Handler handler_;
+    void handler_impl(const asio::error_code& error, size_t)
+    {
+      std::auto_ptr<handshake_handler<Stream, Handler> > this_ptr(this);
+      handler_(error);
+    }
+
+  };  // class handshake_handler
+
+  // Handler for asyncrhonous shutdown
+  template <typename Stream, typename Handler>
+  class shutdown_handler
+    : public base_handler<Stream>
+  {
+  public:
+    shutdown_handler(Handler handler, asio::io_service& io_service)
+      : base_handler<Stream>(io_service),
+        handler_(handler)
+    { 
+      set_func(boost::bind(
+        &shutdown_handler<Stream, Handler>::handler_impl, 
+        this, boost::arg<1>(), boost::arg<2>() ));
+    }
+
+  private:
+    Handler handler_;
+    void handler_impl(const asio::error_code& error, size_t)
+    {
+      std::auto_ptr<shutdown_handler<Stream, Handler> > this_ptr(this);
+      handler_(error);
+    }
+  };  // class shutdown_handler
+
+public:
+  // The implementation type.
+  typedef struct impl_struct
+  {
+    ::SSL* ssl;
+    ::BIO* ext_bio;
+    net_buffer recv_buf;
+  } * impl_type;
+
+  // Construct a new stream socket service for the specified io_service.
+  explicit openssl_stream_service(asio::io_service& io_service)
+    : asio::detail::service_base<openssl_stream_service>(io_service),
+      strand_(io_service)
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  // Return a null stream implementation.
+  impl_type null() const
+  {
+    return 0;
+  }
+
+  // Create a new stream implementation.
+  template <typename Stream, typename Context_Service>
+  void create(impl_type& impl, Stream& /*next_layer*/,
+      basic_context<Context_Service>& context)
+  {
+    impl = new impl_struct;
+    impl->ssl = ::SSL_new(context.impl());
+    ::SSL_set_mode(impl->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE);
+    ::SSL_set_mode(impl->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+    ::BIO* int_bio = 0;
+    impl->ext_bio = 0;
+    ::BIO_new_bio_pair(&int_bio, 8192, &impl->ext_bio, 8192);
+    ::SSL_set_bio(impl->ssl, int_bio, int_bio);
+  }
+
+  // Destroy a stream implementation.
+  template <typename Stream>
+  void destroy(impl_type& impl, Stream& /*next_layer*/)
+  {
+    if (impl != 0)
+    {
+      ::BIO_free(impl->ext_bio);
+      ::SSL_free(impl->ssl);
+      delete impl;
+      impl = 0;
+    }
+  }
+
+  // Perform SSL handshaking.
+  template <typename Stream>
+  asio::error_code handshake(impl_type& impl, Stream& next_layer,
+      stream_base::handshake_type type, asio::error_code& ec)
+  {
+    try
+    {
+      openssl_operation<Stream> op(
+        type == stream_base::client ?
+          &ssl_wrap<mutex_type>::SSL_connect:
+          &ssl_wrap<mutex_type>::SSL_accept,
+        next_layer,
+        impl->recv_buf,
+        impl->ssl,
+        impl->ext_bio);
+      op.start();
+    }
+    catch (asio::system_error& e)
+    {
+      ec = e.code();
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Start an asynchronous SSL handshake.
+  template <typename Stream, typename Handler>
+  void async_handshake(impl_type& impl, Stream& next_layer,
+      stream_base::handshake_type type, Handler handler)
+  {
+    typedef handshake_handler<Stream, Handler> connect_handler;
+
+    connect_handler* local_handler = 
+      new connect_handler(handler, get_io_service());
+
+    openssl_operation<Stream>* op = new openssl_operation<Stream>
+    (
+      type == stream_base::client ?
+        &ssl_wrap<mutex_type>::SSL_connect:
+        &ssl_wrap<mutex_type>::SSL_accept,
+      next_layer,
+      impl->recv_buf,
+      impl->ssl,
+      impl->ext_bio,
+      boost::bind
+      (
+        &base_handler<Stream>::do_func, 
+        local_handler,
+        boost::arg<1>(),
+        boost::arg<2>()
+      ),
+      strand_
+    );
+    local_handler->set_operation(op);
+
+    strand_.post(boost::bind(&openssl_operation<Stream>::start, op));
+  }
+
+  // Shut down SSL on the stream.
+  template <typename Stream>
+  asio::error_code shutdown(impl_type& impl, Stream& next_layer,
+      asio::error_code& ec)
+  {
+    try
+    {
+      openssl_operation<Stream> op(
+        &ssl_wrap<mutex_type>::SSL_shutdown,
+        next_layer,
+        impl->recv_buf,
+        impl->ssl,
+        impl->ext_bio);
+      op.start();
+    }
+    catch (asio::system_error& e)
+    {
+      ec = e.code();
+      return ec;
+    }
+
+    ec = asio::error_code();
+    return ec;
+  }
+
+  // Asynchronously shut down SSL on the stream.
+  template <typename Stream, typename Handler>
+  void async_shutdown(impl_type& impl, Stream& next_layer, Handler handler)
+  {
+    typedef shutdown_handler<Stream, Handler> disconnect_handler;
+
+    disconnect_handler* local_handler = 
+      new disconnect_handler(handler, get_io_service());
+
+    openssl_operation<Stream>* op = new openssl_operation<Stream>
+    (
+      &ssl_wrap<mutex_type>::SSL_shutdown,
+      next_layer,
+      impl->recv_buf,
+      impl->ssl,
+      impl->ext_bio,
+      boost::bind
+      (
+        &base_handler<Stream>::do_func, 
+        local_handler, 
+        boost::arg<1>(),
+        boost::arg<2>()
+      ),
+      strand_
+    );
+    local_handler->set_operation(op);
+
+    strand_.post(boost::bind(&openssl_operation<Stream>::start, op));        
+  }
+
+  // Write some data to the stream.
+  template <typename Stream, typename Const_Buffers>
+  std::size_t write_some(impl_type& impl, Stream& next_layer,
+      const Const_Buffers& buffers, asio::error_code& ec)
+  {
+    size_t bytes_transferred = 0;
+    try
+    {
+      asio::const_buffer buffer =
+        asio::detail::buffer_sequence_adapter<
+          asio::const_buffer, Const_Buffers>::first(buffers);
+
+      std::size_t buffer_size = asio::buffer_size(buffer);
+      if (buffer_size > max_buffer_size)
+        buffer_size = max_buffer_size;
+      else if (buffer_size == 0)
+      {
+        ec = asio::error_code();
+        return 0;
+      }
+
+      boost::function<int (SSL*)> send_func =
+        boost::bind(boost::type<int>(), &::SSL_write, boost::arg<1>(),  
+            asio::buffer_cast<const void*>(buffer),
+            static_cast<int>(buffer_size));
+      openssl_operation<Stream> op(
+        send_func,
+        next_layer,
+        impl->recv_buf,
+        impl->ssl,
+        impl->ext_bio
+      );
+      bytes_transferred = static_cast<size_t>(op.start());
+    }
+    catch (asio::system_error& e)
+    {
+      ec = e.code();
+      return 0;
+    }
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  // Start an asynchronous write.
+  template <typename Stream, typename Const_Buffers, typename Handler>
+  void async_write_some(impl_type& impl, Stream& next_layer,
+      const Const_Buffers& buffers, Handler handler)
+  {
+    typedef io_handler<Stream, Handler> send_handler;
+
+    asio::const_buffer buffer =
+      asio::detail::buffer_sequence_adapter<
+        asio::const_buffer, Const_Buffers>::first(buffers);
+
+    std::size_t buffer_size = asio::buffer_size(buffer);
+    if (buffer_size > max_buffer_size)
+      buffer_size = max_buffer_size;
+    else if (buffer_size == 0)
+    {
+      get_io_service().post(asio::detail::bind_handler(
+            handler, asio::error_code(), 0));
+      return;
+    }
+
+    send_handler* local_handler = new send_handler(handler, get_io_service());
+
+    boost::function<int (SSL*)> send_func =
+      boost::bind(boost::type<int>(), &::SSL_write, boost::arg<1>(),
+          asio::buffer_cast<const void*>(buffer),
+          static_cast<int>(buffer_size));
+
+    openssl_operation<Stream>* op = new openssl_operation<Stream>
+    (
+      send_func,
+      next_layer,
+      impl->recv_buf,
+      impl->ssl,
+      impl->ext_bio,
+      boost::bind
+      (
+        &base_handler<Stream>::do_func, 
+        local_handler, 
+        boost::arg<1>(),
+        boost::arg<2>()
+      ),
+      strand_
+    );
+    local_handler->set_operation(op);
+
+    strand_.post(boost::bind(&openssl_operation<Stream>::start, op));        
+  }
+
+  // Read some data from the stream.
+  template <typename Stream, typename Mutable_Buffers>
+  std::size_t read_some(impl_type& impl, Stream& next_layer,
+      const Mutable_Buffers& buffers, asio::error_code& ec)
+  {
+    size_t bytes_transferred = 0;
+    try
+    {
+      asio::mutable_buffer buffer =
+        asio::detail::buffer_sequence_adapter<
+          asio::mutable_buffer, Mutable_Buffers>::first(buffers);
+
+      std::size_t buffer_size = asio::buffer_size(buffer);
+      if (buffer_size > max_buffer_size)
+        buffer_size = max_buffer_size;
+      else if (buffer_size == 0)
+      {
+        ec = asio::error_code();
+        return 0;
+      }
+
+      boost::function<int (SSL*)> recv_func =
+        boost::bind(boost::type<int>(), &::SSL_read, boost::arg<1>(),
+            asio::buffer_cast<void*>(buffer),
+            static_cast<int>(buffer_size));
+      openssl_operation<Stream> op(recv_func,
+        next_layer,
+        impl->recv_buf,
+        impl->ssl,
+        impl->ext_bio
+      );
+
+      bytes_transferred = static_cast<size_t>(op.start());
+    }
+    catch (asio::system_error& e)
+    {
+      ec = e.code();
+      return 0;
+    }
+
+    ec = asio::error_code();
+    return bytes_transferred;
+  }
+
+  // Start an asynchronous read.
+  template <typename Stream, typename Mutable_Buffers, typename Handler>
+  void async_read_some(impl_type& impl, Stream& next_layer,
+      const Mutable_Buffers& buffers, Handler handler)
+  {
+    typedef io_handler<Stream, Handler> recv_handler;
+
+    asio::mutable_buffer buffer =
+      asio::detail::buffer_sequence_adapter<
+        asio::mutable_buffer, Mutable_Buffers>::first(buffers);
+
+    std::size_t buffer_size = asio::buffer_size(buffer);
+    if (buffer_size > max_buffer_size)
+      buffer_size = max_buffer_size;
+    else if (buffer_size == 0)
+    {
+      get_io_service().post(asio::detail::bind_handler(
+            handler, asio::error_code(), 0));
+      return;
+    }
+
+    recv_handler* local_handler = new recv_handler(handler, get_io_service());
+
+    boost::function<int (SSL*)> recv_func =
+      boost::bind(boost::type<int>(), &::SSL_read, boost::arg<1>(),
+          asio::buffer_cast<void*>(buffer),
+          static_cast<int>(buffer_size));
+
+    openssl_operation<Stream>* op = new openssl_operation<Stream>
+    (
+      recv_func,
+      next_layer,
+      impl->recv_buf,
+      impl->ssl,
+      impl->ext_bio,
+      boost::bind
+      (
+        &base_handler<Stream>::do_func, 
+        local_handler, 
+        boost::arg<1>(),
+        boost::arg<2>()
+      ),
+      strand_
+    );
+    local_handler->set_operation(op);
+
+    strand_.post(boost::bind(&openssl_operation<Stream>::start, op));        
+  }
+
+  // Peek at the incoming data on the stream.
+  template <typename Stream, typename Mutable_Buffers>
+  std::size_t peek(impl_type& /*impl*/, Stream& /*next_layer*/,
+      const Mutable_Buffers& /*buffers*/, asio::error_code& ec)
+  {
+    ec = asio::error_code();
+    return 0;
+  }
+
+  // Determine the amount of data that may be read without blocking.
+  template <typename Stream>
+  std::size_t in_avail(impl_type& /*impl*/, Stream& /*next_layer*/,
+      asio::error_code& ec)
+  {
+    ec = asio::error_code();
+    return 0;
+  }
+
+private:  
+  asio::io_service::strand strand_;
+
+  typedef asio::detail::mutex mutex_type;
+  
+  template<typename Mutex>
+  struct ssl_wrap
+  {
+    static Mutex ssl_mutex_;
+
+    static int SSL_accept(SSL *ssl)
+    {
+      typename Mutex::scoped_lock lock(ssl_mutex_);
+      return ::SSL_accept(ssl);
+    }
+  
+    static int SSL_connect(SSL *ssl)
+    {
+      typename Mutex::scoped_lock lock(ssl_mutex_);
+      return ::SSL_connect(ssl);
+    }
+  
+    static int SSL_shutdown(SSL *ssl)
+    {
+      typename Mutex::scoped_lock lock(ssl_mutex_);
+      return ::SSL_shutdown(ssl);  
+    }    
+  };  
+};
+
+template<typename Mutex>
+Mutex openssl_stream_service::ssl_wrap<Mutex>::ssl_mutex_;
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_OPENSSL_STREAM_SERVICE_HPP
diff --git a/ext/asio/ssl/detail/openssl_types.hpp b/ext/asio/ssl/detail/openssl_types.hpp
new file mode 100755
index 0000000000..c697d7400c
--- /dev/null
+++ b/ext/asio/ssl/detail/openssl_types.hpp
@@ -0,0 +1,31 @@
+//
+// openssl_types.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_OPENSSL_TYPES_HPP
+#define ASIO_SSL_DETAIL_OPENSSL_TYPES_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <openssl/conf.h>
+#include <openssl/ssl.h>
+#include <openssl/engine.h>
+#include <openssl/err.h>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_OPENSSL_TYPES_HPP
diff --git a/ext/asio/ssl/stream.hpp b/ext/asio/ssl/stream.hpp
new file mode 100644
index 0000000000..e800e626ab
--- /dev/null
+++ b/ext/asio/ssl/stream.hpp
@@ -0,0 +1,516 @@
+//
+// stream.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_STREAM_HPP
+#define ASIO_SSL_STREAM_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/ssl/basic_context.hpp"
+#include "asio/ssl/stream_base.hpp"
+#include "asio/ssl/stream_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// Provides stream-oriented functionality using SSL.
+/**
+ * The stream class template provides asynchronous and blocking stream-oriented
+ * functionality using SSL.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Example
+ * To use the SSL stream template with an ip::tcp::socket, you would write:
+ * @code
+ * asio::io_service io_service;
+ * asio::ssl::context context(io_service, asio::ssl::context::sslv23);
+ * asio::ssl::stream<asio::ip::tcp::socket> sock(io_service, context);
+ * @endcode
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncRead_Stream, SyncWriteStream.
+ */
+template <typename Stream, typename Service = stream_service>
+class stream
+  : public stream_base,
+    private boost::noncopyable
+{
+public:
+  /// The type of the next layer.
+  typedef typename boost::remove_reference<Stream>::type next_layer_type;
+
+  /// The type of the lowest layer.
+  typedef typename next_layer_type::lowest_layer_type lowest_layer_type;
+
+  /// The type of the service that will be used to provide stream operations.
+  typedef Service service_type;
+
+  /// The native implementation type of the stream.
+  typedef typename service_type::impl_type impl_type;
+
+  /// Construct a stream.
+  /**
+   * This constructor creates a stream and initialises the underlying stream
+   * object.
+   *
+   * @param arg The argument to be passed to initialise the underlying stream.
+   *
+   * @param context The SSL context to be used for the stream.
+   */
+  template <typename Arg, typename Context_Service>
+  explicit stream(Arg& arg, basic_context<Context_Service>& context)
+    : next_layer_(arg),
+      service_(asio::use_service<Service>(next_layer_.get_io_service())),
+      impl_(service_.null())
+  {
+    service_.create(impl_, next_layer_, context);
+  }
+
+  /// Destructor.
+  ~stream()
+  {
+    service_.destroy(impl_, next_layer_);
+  }
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with
+  /// the object.
+  /**
+   * This function may be used to obtain the io_service object that the stream
+   * uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_service object that stream will use to
+   * dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_service& io_service()
+  {
+    return next_layer_.get_io_service();
+  }
+
+  /// Get the io_service associated with the object.
+  /**
+   * This function may be used to obtain the io_service object that the stream
+   * uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_service object that stream will use to
+   * dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_service& get_io_service()
+  {
+    return next_layer_.get_io_service();
+  }
+
+  /// Get a reference to the next layer.
+  /**
+   * This function returns a reference to the next layer in a stack of stream
+   * layers.
+   *
+   * @return A reference to the next layer in the stack of stream layers.
+   * Ownership is not transferred to the caller.
+   */
+  next_layer_type& next_layer()
+  {
+    return next_layer_;
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * stream layers.
+   *
+   * @return A reference to the lowest layer in the stack of stream layers.
+   * Ownership is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return next_layer_.lowest_layer();
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * stream layers.
+   *
+   * @return A const reference to the lowest layer in the stack of stream
+   * layers. Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return next_layer_.lowest_layer();
+  }
+
+  /// Get the underlying implementation in the native type.
+  /**
+   * This function may be used to obtain the underlying implementation of the
+   * context. This is intended to allow access to stream functionality that is
+   * not otherwise provided.
+   */
+  impl_type impl()
+  {
+    return impl_;
+  }
+
+  /// Perform SSL handshaking.
+  /**
+   * This function is used to perform SSL handshaking on the stream. The
+   * function call will block until handshaking is complete or an error occurs.
+   *
+   * @param type The type of handshaking to be performed, i.e. as a client or as
+   * a server.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void handshake(handshake_type type)
+  {
+    asio::error_code ec;
+    service_.handshake(impl_, next_layer_, type, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Perform SSL handshaking.
+  /**
+   * This function is used to perform SSL handshaking on the stream. The
+   * function call will block until handshaking is complete or an error occurs.
+   *
+   * @param type The type of handshaking to be performed, i.e. as a client or as
+   * a server.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code handshake(handshake_type type,
+      asio::error_code& ec)
+  {
+    return service_.handshake(impl_, next_layer_, type, ec);
+  }
+
+  /// Start an asynchronous SSL handshake.
+  /**
+   * This function is used to asynchronously perform an SSL handshake on the
+   * stream. This function call always returns immediately.
+   *
+   * @param type The type of handshaking to be performed, i.e. as a client or as
+   * a server.
+   *
+   * @param handler The handler to be called when the handshake operation
+   * completes. Copies will be made of the handler as required. The equivalent
+   * function signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error // Result of operation.
+   * ); @endcode
+   */
+  template <typename HandshakeHandler>
+  void async_handshake(handshake_type type, HandshakeHandler handler)
+  {
+    service_.async_handshake(impl_, next_layer_, type, handler);
+  }
+
+  /// Shut down SSL on the stream.
+  /**
+   * This function is used to shut down SSL on the stream. The function call
+   * will block until SSL has been shut down or an error occurs.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void shutdown()
+  {
+    asio::error_code ec;
+    service_.shutdown(impl_, next_layer_, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Shut down SSL on the stream.
+  /**
+   * This function is used to shut down SSL on the stream. The function call
+   * will block until SSL has been shut down or an error occurs.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code shutdown(asio::error_code& ec)
+  {
+    return service_.shutdown(impl_, next_layer_, ec);
+  }
+
+  /// Asynchronously shut down SSL on the stream.
+  /**
+   * This function is used to asynchronously shut down SSL on the stream. This
+   * function call always returns immediately.
+   *
+   * @param handler The handler to be called when the handshake operation
+   * completes. Copies will be made of the handler as required. The equivalent
+   * function signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error // Result of operation.
+   * ); @endcode
+   */
+  template <typename ShutdownHandler>
+  void async_shutdown(ShutdownHandler handler)
+  {
+    service_.async_shutdown(impl_, next_layer_, handler);
+  }
+
+  /// Write some data to the stream.
+  /**
+   * This function is used to write data on the stream. The function call will
+   * block until one or more bytes of data has been written successfully, or
+   * until an error occurs.
+   *
+   * @param buffers The data to be written.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that all
+   * data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = service_.write_some(impl_, next_layer_, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Write some data to the stream.
+  /**
+   * This function is used to write data on the stream. The function call will
+   * block until one or more bytes of data has been written successfully, or
+   * until an error occurs.
+   *
+   * @param buffers The data to be written to the stream.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that all
+   * data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return service_.write_some(impl_, next_layer_, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  /**
+   * This function is used to asynchronously write one or more bytes of data to
+   * the stream. The function call always returns immediately.
+   *
+   * @param buffers The data to be written to the stream. Although the buffers
+   * object may be copied as necessary, ownership of the underlying buffers is
+   * retained by the caller, which must guarantee that they remain valid until
+   * the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The equivalent function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   *
+   * @note The async_write_some operation may not transmit all of the data to
+   * the peer. Consider using the @ref async_write function if you need to
+   * ensure that all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    service_.async_write_some(impl_, next_layer_, buffers, handler);
+  }
+
+  /// Read some data from the stream.
+  /**
+   * This function is used to read data from the stream. The function call will
+   * block until one or more bytes of data has been read successfully, or until
+   * an error occurs.
+   *
+   * @param buffers The buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that the
+   * requested amount of data is read before the blocking operation completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = service_.read_some(impl_, next_layer_, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Read some data from the stream.
+  /**
+   * This function is used to read data from the stream. The function call will
+   * block until one or more bytes of data has been read successfully, or until
+   * an error occurs.
+   *
+   * @param buffers The buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that the
+   * requested amount of data is read before the blocking operation completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return service_.read_some(impl_, next_layer_, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  /**
+   * This function is used to asynchronously read one or more bytes of data from
+   * the stream. The function call always returns immediately.
+   *
+   * @param buffers The buffers into which the data will be read. Although the
+   * buffers object may be copied as necessary, ownership of the underlying
+   * buffers is retained by the caller, which must guarantee that they remain
+   * valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The equivalent function
+   * signature of the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   *
+   * @note The async_read_some operation may not read all of the requested
+   * number of bytes. Consider using the @ref async_read function if you need to
+   * ensure that the requested amount of data is read before the asynchronous
+   * operation completes.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    service_.async_read_some(impl_, next_layer_, buffers, handler);
+  }
+
+  /// Peek at the incoming data on the stream.
+  /**
+   * This function is used to peek at the incoming data on the stream, without
+   * removing it from the input queue. The function call will block until data
+   * has been read successfully or an error occurs.
+   *
+   * @param buffers The buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = service_.peek(impl_, next_layer_, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Peek at the incoming data on the stream.
+  /**
+   * This function is used to peek at the incoming data on the stream, withoutxi
+   * removing it from the input queue. The function call will block until data
+   * has been read successfully or an error occurs.
+   *
+   * @param buffers The buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t peek(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return service_.peek(impl_, next_layer_, buffers, ec);
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  /**
+   * This function is used to determine the amount of data, in bytes, that may
+   * be read from the stream without blocking.
+   *
+   * @returns The number of bytes of data that can be read without blocking.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  std::size_t in_avail()
+  {
+    asio::error_code ec;
+    std::size_t s = service_.in_avail(impl_, next_layer_, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  /**
+   * This function is used to determine the amount of data, in bytes, that may
+   * be read from the stream without blocking.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes of data that can be read without blocking.
+   */
+  std::size_t in_avail(asio::error_code& ec)
+  {
+    return service_.in_avail(impl_, next_layer_, ec);
+  }
+
+private:
+  /// The next layer.
+  Stream next_layer_;
+
+  /// The backend service implementation.
+  service_type& service_;
+
+  /// The underlying native implementation.
+  impl_type impl_;
+};
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_STREAM_HPP
diff --git a/ext/asio/ssl/stream_base.hpp b/ext/asio/ssl/stream_base.hpp
new file mode 100755
index 0000000000..d62d386ae5
--- /dev/null
+++ b/ext/asio/ssl/stream_base.hpp
@@ -0,0 +1,60 @@
+//
+// stream_base.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_STREAM_BASE_HPP
+#define ASIO_SSL_STREAM_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/detail/workaround.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// The stream_base class is used as a base for the asio::ssl::stream
+/// class template so that we have a common place to define various enums.
+class stream_base
+{
+public:
+  /// Different handshake types.
+  enum handshake_type
+  {
+    /// Perform handshaking as a client.
+    client,
+
+    /// Perform handshaking as a server.
+    server
+  };
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~stream_base()
+  {
+  }
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+private:
+  // Workaround to enable the empty base optimisation with Borland C++.
+  char dummy_;
+#endif
+};
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_STREAM_BASE_HPP
diff --git a/ext/asio/ssl/stream_service.hpp b/ext/asio/ssl/stream_service.hpp
new file mode 100644
index 0000000000..1f1e6ad96d
--- /dev/null
+++ b/ext/asio/ssl/stream_service.hpp
@@ -0,0 +1,186 @@
+//
+// stream_service.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_STREAM_SERVICE_HPP
+#define ASIO_SSL_STREAM_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/noncopyable.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/ssl/basic_context.hpp"
+#include "asio/ssl/stream_base.hpp"
+#include "asio/ssl/detail/openssl_stream_service.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// Default service implementation for an SSL stream.
+class stream_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<stream_service>
+#endif
+{
+private:
+  // The type of the platform-specific implementation.
+  typedef detail::openssl_stream_service service_impl_type;
+
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The type of a stream implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined impl_type;
+#else
+  typedef service_impl_type::impl_type impl_type;
+#endif
+
+  /// Construct a new stream service for the specified io_service.
+  explicit stream_service(asio::io_service& io_service)
+    : asio::detail::service_base<stream_service>(io_service),
+      service_impl_(asio::use_service<service_impl_type>(io_service))
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+  }
+
+  /// Return a null stream implementation.
+  impl_type null() const
+  {
+    return service_impl_.null();
+  }
+
+  /// Create a new stream implementation.
+  template <typename Stream, typename Context_Service>
+  void create(impl_type& impl, Stream& next_layer,
+      basic_context<Context_Service>& context)
+  {
+    service_impl_.create(impl, next_layer, context);
+  }
+
+  /// Destroy a stream implementation.
+  template <typename Stream>
+  void destroy(impl_type& impl, Stream& next_layer)
+  {
+    service_impl_.destroy(impl, next_layer);
+  }
+
+  /// Perform SSL handshaking.
+  template <typename Stream>
+  asio::error_code handshake(impl_type& impl, Stream& next_layer,
+      stream_base::handshake_type type, asio::error_code& ec)
+  {
+    return service_impl_.handshake(impl, next_layer, type, ec);
+  }
+
+  /// Start an asynchronous SSL handshake.
+  template <typename Stream, typename HandshakeHandler>
+  void async_handshake(impl_type& impl, Stream& next_layer,
+      stream_base::handshake_type type, HandshakeHandler handler)
+  {
+    service_impl_.async_handshake(impl, next_layer, type, handler);
+  }
+
+  /// Shut down SSL on the stream.
+  template <typename Stream>
+  asio::error_code shutdown(impl_type& impl, Stream& next_layer,
+      asio::error_code& ec)
+  {
+    return service_impl_.shutdown(impl, next_layer, ec);
+  }
+
+  /// Asynchronously shut down SSL on the stream.
+  template <typename Stream, typename ShutdownHandler>
+  void async_shutdown(impl_type& impl, Stream& next_layer,
+      ShutdownHandler handler)
+  {
+    service_impl_.async_shutdown(impl, next_layer, handler);
+  }
+
+  /// Write some data to the stream.
+  template <typename Stream, typename ConstBufferSequence>
+  std::size_t write_some(impl_type& impl, Stream& next_layer,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.write_some(impl, next_layer, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  template <typename Stream, typename ConstBufferSequence,
+      typename WriteHandler>
+  void async_write_some(impl_type& impl, Stream& next_layer,
+      const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    service_impl_.async_write_some(impl, next_layer, buffers, handler);
+  }
+
+  /// Read some data from the stream.
+  template <typename Stream, typename MutableBufferSequence>
+  std::size_t read_some(impl_type& impl, Stream& next_layer,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.read_some(impl, next_layer, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  template <typename Stream, typename MutableBufferSequence,
+      typename ReadHandler>
+  void async_read_some(impl_type& impl, Stream& next_layer,
+      const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    service_impl_.async_read_some(impl, next_layer, buffers, handler);
+  }
+
+  /// Peek at the incoming data on the stream.
+  template <typename Stream, typename MutableBufferSequence>
+  std::size_t peek(impl_type& impl, Stream& next_layer,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.peek(impl, next_layer, buffers, ec);
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  template <typename Stream>
+  std::size_t in_avail(impl_type& impl, Stream& next_layer,
+      asio::error_code& ec)
+  {
+    return service_impl_.in_avail(impl, next_layer, ec);
+  }
+
+private:
+  // The service that provides the platform-specific implementation.
+  service_impl_type& service_impl_;
+};
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_STREAM_SERVICE_HPP
diff --git a/ext/asio/strand.hpp b/ext/asio/strand.hpp
new file mode 100644
index 0000000000..6b321513dd
--- /dev/null
+++ b/ext/asio/strand.hpp
@@ -0,0 +1,226 @@
+//
+// strand.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_STRAND_HPP
+#define ASIO_STRAND_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/strand_service.hpp"
+#include "asio/detail/wrapped_handler.hpp"
+
+namespace asio {
+
+/// Provides serialised handler execution.
+/**
+ * The io_service::strand class provides the ability to post and dispatch
+ * handlers with the guarantee that none of those handlers will execute
+ * concurrently.
+ *
+ * @par Order of handler invocation
+ * Given:
+ *
+ * @li a strand object @c s
+ *
+ * @li an object @c a meeting completion handler requirements
+ *
+ * @li an object @c a1 which is an arbitrary copy of @c a made by the
+ * implementation
+ *
+ * @li an object @c b meeting completion handler requirements
+ *
+ * @li an object @c b1 which is an arbitrary copy of @c b made by the
+ * implementation
+ *
+ * if any of the following conditions are true:
+ *
+ * @li @c s.post(a) happens-before @c s.post(b)
+ * 
+ * @li @c s.post(a) happens-before @c s.dispatch(b), where the latter is
+ * performed outside the strand
+ * 
+ * @li @c s.dispatch(a) happens-before @c s.post(b), where the former is
+ * performed outside the strand
+ * 
+ * @li @c s.dispatch(a) happens-before @c s.dispatch(b), where both are
+ * performed outside the strand
+ *   
+ * then @c asio_handler_invoke(a1, &a1) happens-before
+ * @c asio_handler_invoke(b1, &b1).
+ * 
+ * Note that in the following case:
+ * @code async_op_1(..., s.wrap(a));
+ * async_op_2(..., s.wrap(b)); @endcode
+ * the completion of the first async operation will perform @c s.dispatch(a),
+ * and the second will perform @c s.dispatch(b), but the order in which those
+ * are performed is unspecified. That is, you cannot state whether one
+ * happens-before the other. Therefore none of the above conditions are met and
+ * no ordering guarantee is made.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Dispatcher.
+ */
+class io_service::strand
+{
+public:
+  /// Constructor.
+  /**
+   * Constructs the strand.
+   *
+   * @param io_service The io_service object that the strand will use to
+   * dispatch handlers that are ready to be run.
+   */
+  explicit strand(asio::io_service& io_service)
+    : service_(asio::use_service<
+        asio::detail::strand_service>(io_service))
+  {
+    service_.construct(impl_);
+  }
+
+  /// Destructor.
+  /**
+   * Destroys a strand.
+   *
+   * Handlers posted through the strand that have not yet been invoked will
+   * still be dispatched in a way that meets the guarantee of non-concurrency.
+   */
+  ~strand()
+  {
+    service_.destroy(impl_);
+  }
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with
+  /// the strand.
+  /**
+   * This function may be used to obtain the io_service object that the strand
+   * uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_service object that the strand will use to
+   * dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_service& io_service()
+  {
+    return service_.get_io_service();
+  }
+
+  /// Get the io_service associated with the strand.
+  /**
+   * This function may be used to obtain the io_service object that the strand
+   * uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_service object that the strand will use to
+   * dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_service& get_io_service()
+  {
+    return service_.get_io_service();
+  }
+
+  /// Request the strand to invoke the given handler.
+  /**
+   * This function is used to ask the strand to execute the given handler.
+   *
+   * The strand object guarantees that handlers posted or dispatched through
+   * the strand will not be executed concurrently. The handler may be executed
+   * inside this function if the guarantee can be met. If this function is
+   * called from within a handler that was posted or dispatched through the same
+   * strand, then the new handler will be executed immediately.
+   *
+   * The strand's guarantee is in addition to the guarantee provided by the
+   * underlying io_service. The io_service guarantees that the handler will only
+   * be called in a thread in which the io_service's run member function is
+   * currently being invoked.
+   *
+   * @param handler The handler to be called. The strand will make a copy of the
+   * handler object as required. The function signature of the handler must be:
+   * @code void handler(); @endcode
+   */
+  template <typename Handler>
+  void dispatch(Handler handler)
+  {
+    service_.dispatch(impl_, handler);
+  }
+
+  /// Request the strand to invoke the given handler and return
+  /// immediately.
+  /**
+   * This function is used to ask the strand to execute the given handler, but
+   * without allowing the strand to call the handler from inside this function.
+   *
+   * The strand object guarantees that handlers posted or dispatched through
+   * the strand will not be executed concurrently. The strand's guarantee is in
+   * addition to the guarantee provided by the underlying io_service. The
+   * io_service guarantees that the handler will only be called in a thread in
+   * which the io_service's run member function is currently being invoked.
+   *
+   * @param handler The handler to be called. The strand will make a copy of the
+   * handler object as required. The function signature of the handler must be:
+   * @code void handler(); @endcode
+   */
+  template <typename Handler>
+  void post(Handler handler)
+  {
+    service_.post(impl_, handler);
+  }
+
+  /// Create a new handler that automatically dispatches the wrapped handler
+  /// on the strand.
+  /**
+   * This function is used to create a new handler function object that, when
+   * invoked, will automatically pass the wrapped handler to the strand's
+   * dispatch function.
+   *
+   * @param handler The handler to be wrapped. The strand will make a copy of
+   * the handler object as required. The function signature of the handler must
+   * be: @code void handler(A1 a1, ... An an); @endcode
+   *
+   * @return A function object that, when invoked, passes the wrapped handler to
+   * the strand's dispatch function. Given a function object with the signature:
+   * @code R f(A1 a1, ... An an); @endcode
+   * If this function object is passed to the wrap function like so:
+   * @code strand.wrap(f); @endcode
+   * then the return value is a function object with the signature
+   * @code void g(A1 a1, ... An an); @endcode
+   * that, when invoked, executes code equivalent to:
+   * @code strand.dispatch(boost::bind(f, a1, ... an)); @endcode
+   */
+  template <typename Handler>
+#if defined(GENERATING_DOCUMENTATION)
+  unspecified
+#else
+  detail::wrapped_handler<strand, Handler>
+#endif
+  wrap(Handler handler)
+  {
+    return detail::wrapped_handler<io_service::strand, Handler>(*this, handler);
+  }
+
+private:
+  asio::detail::strand_service& service_;
+  asio::detail::strand_service::implementation_type impl_;
+};
+
+/// Typedef for backwards compatibility.
+typedef asio::io_service::strand strand;
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_STRAND_HPP
diff --git a/ext/asio/stream_socket_service.hpp b/ext/asio/stream_socket_service.hpp
new file mode 100644
index 0000000000..1c4935c123
--- /dev/null
+++ b/ext/asio/stream_socket_service.hpp
@@ -0,0 +1,278 @@
+//
+// stream_socket_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_STREAM_SOCKET_SERVICE_HPP
+#define ASIO_STREAM_SOCKET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_socket_service.hpp"
+#else
+# include "asio/detail/reactive_socket_service.hpp"
+#endif
+
+namespace asio {
+
+/// Default service implementation for a stream socket.
+template <typename Protocol>
+class stream_socket_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<stream_socket_service<Protocol> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+  /// The protocol type.
+  typedef Protocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+private:
+  // The type of the platform-specific implementation.
+#if defined(ASIO_HAS_IOCP)
+  typedef detail::win_iocp_socket_service<Protocol> service_impl_type;
+#else
+  typedef detail::reactive_socket_service<Protocol> service_impl_type;
+#endif
+
+public:
+  /// The type of a stream socket implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native socket type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef typename service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new stream socket service for the specified io_service.
+  explicit stream_socket_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        stream_socket_service<Protocol> >(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new stream socket implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a stream socket implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Open a stream socket.
+  asio::error_code open(implementation_type& impl,
+      const protocol_type& protocol, asio::error_code& ec)
+  {
+    if (protocol.type() == SOCK_STREAM)
+      service_impl_.open(impl, protocol, ec);
+    else
+      ec = asio::error::invalid_argument;
+    return ec;
+  }
+
+  /// Assign an existing native socket to a stream socket.
+  asio::error_code assign(implementation_type& impl,
+      const protocol_type& protocol, const native_type& native_socket,
+      asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, protocol, native_socket, ec);
+  }
+
+  /// Determine whether the socket is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Close a stream socket implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native socket implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the socket.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Determine whether the socket is at the out-of-band data mark.
+  bool at_mark(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.at_mark(impl, ec);
+  }
+
+  /// Determine the number of bytes available for reading.
+  std::size_t available(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.available(impl, ec);
+  }
+
+  /// Bind the stream socket to the specified local endpoint.
+  asio::error_code bind(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    return service_impl_.bind(impl, endpoint, ec);
+  }
+
+  /// Connect the stream socket to the specified endpoint.
+  asio::error_code connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, asio::error_code& ec)
+  {
+    return service_impl_.connect(impl, peer_endpoint, ec);
+  }
+
+  /// Start an asynchronous connect.
+  template <typename ConnectHandler>
+  void async_connect(implementation_type& impl,
+      const endpoint_type& peer_endpoint, ConnectHandler handler)
+  {
+    service_impl_.async_connect(impl, peer_endpoint, handler);
+  }
+
+  /// Set a socket option.
+  template <typename SettableSocketOption>
+  asio::error_code set_option(implementation_type& impl,
+      const SettableSocketOption& option, asio::error_code& ec)
+  {
+    return service_impl_.set_option(impl, option, ec);
+  }
+
+  /// Get a socket option.
+  template <typename GettableSocketOption>
+  asio::error_code get_option(const implementation_type& impl,
+      GettableSocketOption& option, asio::error_code& ec) const
+  {
+    return service_impl_.get_option(impl, option, ec);
+  }
+
+  /// Perform an IO control command on the socket.
+  template <typename IoControlCommand>
+  asio::error_code io_control(implementation_type& impl,
+      IoControlCommand& command, asio::error_code& ec)
+  {
+    return service_impl_.io_control(impl, command, ec);
+  }
+
+  /// Get the local endpoint.
+  endpoint_type local_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.local_endpoint(impl, ec);
+  }
+
+  /// Get the remote endpoint.
+  endpoint_type remote_endpoint(const implementation_type& impl,
+      asio::error_code& ec) const
+  {
+    return service_impl_.remote_endpoint(impl, ec);
+  }
+
+  /// Disable sends or receives on the socket.
+  asio::error_code shutdown(implementation_type& impl,
+      socket_base::shutdown_type what, asio::error_code& ec)
+  {
+    return service_impl_.shutdown(impl, what, ec);
+  }
+
+  /// Send the given data to the peer.
+  template <typename ConstBufferSequence>
+  std::size_t send(implementation_type& impl,
+      const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.send(impl, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous send.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_send(implementation_type& impl,
+      const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, WriteHandler handler)
+  {
+    service_impl_.async_send(impl, buffers, flags, handler);
+  }
+
+  /// Receive some data from the peer.
+  template <typename MutableBufferSequence>
+  std::size_t receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, asio::error_code& ec)
+  {
+    return service_impl_.receive(impl, buffers, flags, ec);
+  }
+
+  /// Start an asynchronous receive.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_receive(implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, ReadHandler handler)
+  {
+    service_impl_.async_receive(impl, buffers, flags, handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_STREAM_SOCKET_SERVICE_HPP
diff --git a/ext/asio/streambuf.hpp b/ext/asio/streambuf.hpp
new file mode 100644
index 0000000000..665155be84
--- /dev/null
+++ b/ext/asio/streambuf.hpp
@@ -0,0 +1,35 @@
+//
+// streambuf.hpp
+// ~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_STREAMBUF_HPP
+#define ASIO_STREAMBUF_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/basic_streambuf.hpp"
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+namespace asio {
+
+/// Typedef for the typical usage of basic_streambuf.
+typedef basic_streambuf<> streambuf;
+
+} // namespace asio
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_STREAMBUF_HPP
diff --git a/ext/asio/system_error.hpp b/ext/asio/system_error.hpp
new file mode 100644
index 0000000000..e704b3fb90
--- /dev/null
+++ b/ext/asio/system_error.hpp
@@ -0,0 +1,121 @@
+//
+// system_error.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SYSTEM_ERROR_HPP
+#define ASIO_SYSTEM_ERROR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <cerrno>
+#include <exception>
+#include <string>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error_code.hpp"
+
+namespace asio {
+
+/// The system_error class is used to represent system conditions that
+/// prevent the library from operating correctly.
+class system_error
+  : public std::exception
+{
+public:
+  /// Construct with an error code.
+  system_error(const error_code& code)
+    : code_(code),
+      context_()
+  {
+  }
+
+  /// Construct with an error code and context.
+  system_error(const error_code& code, const std::string& context)
+    : code_(code),
+      context_(context)
+  {
+  }
+
+  /// Copy constructor.
+  system_error(const system_error& other)
+    : std::exception(other),
+      code_(other.code_),
+      context_(other.context_),
+      what_()
+  {
+  }
+
+  /// Destructor.
+  virtual ~system_error() throw ()
+  {
+  }
+
+  /// Assignment operator.
+  system_error& operator=(const system_error& e)
+  {
+    context_ = e.context_;
+    code_ = e.code_;
+    what_.reset();
+    return *this;
+  }
+
+  /// Get a string representation of the exception.
+  virtual const char* what() const throw ()
+  {
+#if !defined(BOOST_NO_EXCEPTIONS)
+    try
+#endif // !defined(BOOST_NO_EXCEPTIONS)
+    {
+      if (!what_)
+      {
+        std::string tmp(context_);
+        if (tmp.length())
+          tmp += ": ";
+        tmp += code_.message();
+        what_.reset(new std::string(tmp));
+      }
+      return what_->c_str();
+    }
+#if !defined(BOOST_NO_EXCEPTIONS)
+    catch (std::exception&)
+    {
+      return "system_error";
+    }
+#endif // !defined(BOOST_NO_EXCEPTIONS)
+  }
+
+  /// Get the error code associated with the exception.
+  error_code code() const
+  {
+    return code_;
+  }
+
+private:
+  // The code associated with the error.
+  error_code code_;
+
+  // The context associated with the error.
+  std::string context_;
+
+  // The string representation of the error.
+  mutable boost::scoped_ptr<std::string> what_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SYSTEM_ERROR_HPP
diff --git a/ext/asio/thread.hpp b/ext/asio/thread.hpp
new file mode 100644
index 0000000000..9e578bc598
--- /dev/null
+++ b/ext/asio/thread.hpp
@@ -0,0 +1,91 @@
+//
+// thread.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_THREAD_HPP
+#define ASIO_THREAD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/thread.hpp"
+
+namespace asio {
+
+/// A simple abstraction for starting threads.
+/**
+ * The asio::thread class implements the smallest possible subset of the
+ * functionality of boost::thread. It is intended to be used only for starting
+ * a thread and waiting for it to exit. If more extensive threading
+ * capabilities are required, you are strongly advised to use something else.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Example
+ * A typical use of asio::thread would be to launch a thread to run an
+ * io_service's event processing loop:
+ *
+ * @par
+ * @code asio::io_service io_service;
+ * // ...
+ * asio::thread t(boost::bind(&asio::io_service::run, &io_service));
+ * // ...
+ * t.join(); @endcode
+ */
+class thread
+  : private noncopyable
+{
+public:
+  /// Start a new thread that executes the supplied function.
+  /**
+   * This constructor creates a new thread that will execute the given function
+   * or function object.
+   *
+   * @param f The function or function object to be run in the thread. The
+   * function signature must be: @code void f(); @endcode
+   */
+  template <typename Function>
+  explicit thread(Function f)
+    : impl_(f)
+  {
+  }
+
+  /// Destructor.
+  ~thread()
+  {
+  }
+
+  /// Wait for the thread to exit.
+  /**
+   * This function will block until the thread has exited.
+   *
+   * If this function is not called before the thread object is destroyed, the
+   * thread itself will continue to run until completion. You will, however,
+   * no longer have the ability to wait for it to exit.
+   */
+  void join()
+  {
+    impl_.join();
+  }
+
+private:
+  detail::thread impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_THREAD_HPP
diff --git a/ext/asio/time_traits.hpp b/ext/asio/time_traits.hpp
new file mode 100644
index 0000000000..0371373689
--- /dev/null
+++ b/ext/asio/time_traits.hpp
@@ -0,0 +1,82 @@
+//
+// time_traits.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_TIME_TRAITS_HPP
+#define ASIO_TIME_TRAITS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/socket_types.hpp" // Must come before posix_time.
+
+#include "asio/detail/push_options.hpp"
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+#include "asio/detail/pop_options.hpp"
+
+namespace asio {
+
+/// Time traits suitable for use with the deadline timer.
+template <typename Time>
+struct time_traits;
+
+/// Time traits specialised for posix_time.
+template <>
+struct time_traits<boost::posix_time::ptime>
+{
+  /// The time type.
+  typedef boost::posix_time::ptime time_type;
+
+  /// The duration type.
+  typedef boost::posix_time::time_duration duration_type;
+
+  /// Get the current time.
+  static time_type now()
+  {
+#if defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
+    return boost::posix_time::microsec_clock::universal_time();
+#else // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
+    return boost::posix_time::second_clock::universal_time();
+#endif // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
+  }
+
+  /// Add a duration to a time.
+  static time_type add(const time_type& t, const duration_type& d)
+  {
+    return t + d;
+  }
+
+  /// Subtract one time from another.
+  static duration_type subtract(const time_type& t1, const time_type& t2)
+  {
+    return t1 - t2;
+  }
+
+  /// Test whether one time is less than another.
+  static bool less_than(const time_type& t1, const time_type& t2)
+  {
+    return t1 < t2;
+  }
+
+  /// Convert to POSIX duration type.
+  static boost::posix_time::time_duration to_posix_duration(
+      const duration_type& d)
+  {
+    return d;
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_TIME_TRAITS_HPP
diff --git a/ext/asio/version.hpp b/ext/asio/version.hpp
new file mode 100644
index 0000000000..198f5086fa
--- /dev/null
+++ b/ext/asio/version.hpp
@@ -0,0 +1,23 @@
+//
+// version.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_VERSION_HPP
+#define ASIO_VERSION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+// ASIO_VERSION % 100 is the sub-minor version
+// ASIO_VERSION / 100 % 1000 is the minor version
+// ASIO_VERSION / 100000 is the major version
+#define ASIO_VERSION 100405 // 1.4.5
+
+#endif // ASIO_VERSION_HPP
diff --git a/ext/asio/windows/basic_handle.hpp b/ext/asio/windows/basic_handle.hpp
new file mode 100644
index 0000000000..8c2ee60ebb
--- /dev/null
+++ b/ext/asio/windows/basic_handle.hpp
@@ -0,0 +1,225 @@
+//
+// basic_handle.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_BASIC_HANDLE_HPP
+#define ASIO_WINDOWS_BASIC_HANDLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_io_object.hpp"
+#include "asio/error.hpp"
+#include "asio/detail/throw_error.hpp"
+
+namespace asio {
+namespace windows {
+
+/// Provides Windows handle functionality.
+/**
+ * The windows::basic_handle class template provides the ability to wrap a
+ * Windows handle.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename HandleService>
+class basic_handle
+  : public basic_io_object<HandleService>
+{
+public:
+  /// The native representation of a handle.
+  typedef typename HandleService::native_type native_type;
+
+  /// A basic_handle is always the lowest layer.
+  typedef basic_handle<HandleService> lowest_layer_type;
+
+  /// Construct a basic_handle without opening it.
+  /**
+   * This constructor creates a handle without opening it.
+   *
+   * @param io_service The io_service object that the handle will use to
+   * dispatch handlers for any asynchronous operations performed on the handle.
+   */
+  explicit basic_handle(asio::io_service& io_service)
+    : basic_io_object<HandleService>(io_service)
+  {
+  }
+
+  /// Construct a basic_handle on an existing native handle.
+  /**
+   * This constructor creates a handle object to hold an existing native handle.
+   *
+   * @param io_service The io_service object that the handle will use to
+   * dispatch handlers for any asynchronous operations performed on the handle.
+   *
+   * @param native_handle A native handle.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_handle(asio::io_service& io_service,
+      const native_type& native_handle)
+    : basic_io_object<HandleService>(io_service)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, native_handle, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * layers. Since a basic_handle cannot contain any further layers, it simply
+   * returns a reference to itself.
+   *
+   * @return A reference to the lowest layer in the stack of layers. Ownership
+   * is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return *this;
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * layers. Since a basic_handle cannot contain any further layers, it simply
+   * returns a reference to itself.
+   *
+   * @return A const reference to the lowest layer in the stack of layers.
+   * Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return *this;
+  }
+
+  /// Assign an existing native handle to the handle.
+  /*
+   * This function opens the handle to hold an existing native handle.
+   *
+   * @param native_handle A native handle.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void assign(const native_type& native_handle)
+  {
+    asio::error_code ec;
+    this->service.assign(this->implementation, native_handle, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Assign an existing native handle to the handle.
+  /*
+   * This function opens the handle to hold an existing native handle.
+   *
+   * @param native_handle A native handle.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code assign(const native_type& native_handle,
+      asio::error_code& ec)
+  {
+    return this->service.assign(this->implementation, native_handle, ec);
+  }
+
+  /// Determine whether the handle is open.
+  bool is_open() const
+  {
+    return this->service.is_open(this->implementation);
+  }
+
+  /// Close the handle.
+  /**
+   * This function is used to close the handle. Any asynchronous read or write
+   * operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void close()
+  {
+    asio::error_code ec;
+    this->service.close(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Close the handle.
+  /**
+   * This function is used to close the handle. Any asynchronous read or write
+   * operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code close(asio::error_code& ec)
+  {
+    return this->service.close(this->implementation, ec);
+  }
+
+  /// Get the native handle representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * handle. This is intended to allow access to native handle functionality
+   * that is not otherwise provided.
+   */
+  native_type native()
+  {
+    return this->service.native(this->implementation);
+  }
+
+  /// Cancel all asynchronous operations associated with the handle.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void cancel()
+  {
+    asio::error_code ec;
+    this->service.cancel(this->implementation, ec);
+    asio::detail::throw_error(ec);
+  }
+
+  /// Cancel all asynchronous operations associated with the handle.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  asio::error_code cancel(asio::error_code& ec)
+  {
+    return this->service.cancel(this->implementation, ec);
+  }
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  ~basic_handle()
+  {
+  }
+};
+
+} // namespace windows
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_BASIC_HANDLE_HPP
diff --git a/ext/asio/windows/basic_random_access_handle.hpp b/ext/asio/windows/basic_random_access_handle.hpp
new file mode 100644
index 0000000000..2e6b994e0b
--- /dev/null
+++ b/ext/asio/windows/basic_random_access_handle.hpp
@@ -0,0 +1,320 @@
+//
+// basic_random_access_handle.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_BASIC_RANDOM_ACCESS_HANDLE_HPP
+#define ASIO_WINDOWS_BASIC_RANDOM_ACCESS_HANDLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/windows/basic_handle.hpp"
+#include "asio/windows/random_access_handle_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace windows {
+
+/// Provides random-access handle functionality.
+/**
+ * The windows::basic_random_access_handle class template provides asynchronous
+ * and blocking random-access handle functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename RandomAccessHandleService = random_access_handle_service>
+class basic_random_access_handle
+  : public basic_handle<RandomAccessHandleService>
+{
+public:
+  /// The native representation of a handle.
+  typedef typename RandomAccessHandleService::native_type native_type;
+
+  /// Construct a basic_random_access_handle without opening it.
+  /**
+   * This constructor creates a random-access handle without opening it. The
+   * handle needs to be opened before data can be written to or or read from it.
+   *
+   * @param io_service The io_service object that the random-access handle will
+   * use to dispatch handlers for any asynchronous operations performed on the
+   * handle.
+   */
+  explicit basic_random_access_handle(asio::io_service& io_service)
+    : basic_handle<RandomAccessHandleService>(io_service)
+  {
+  }
+
+  /// Construct a basic_random_access_handle on an existing native handle.
+  /**
+   * This constructor creates a random-access handle object to hold an existing
+   * native handle.
+   *
+   * @param io_service The io_service object that the random-access handle will
+   * use to dispatch handlers for any asynchronous operations performed on the
+   * handle.
+   *
+   * @param native_handle The new underlying handle implementation.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_random_access_handle(asio::io_service& io_service,
+      const native_type& native_handle)
+    : basic_handle<RandomAccessHandleService>(io_service, native_handle)
+  {
+  }
+
+  /// Write some data to the handle at the specified offset.
+  /**
+   * This function is used to write data to the random-access handle. The
+   * function call will block until one or more bytes of the data has been
+   * written successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The write_some_at operation may not write all of the data. Consider
+   * using the @ref write_at function if you need to ensure that all data is
+   * written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.write_some_at(42, asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some_at(boost::uint64_t offset,
+      const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.write_some_at(
+        this->implementation, offset, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Write some data to the handle at the specified offset.
+  /**
+   * This function is used to write data to the random-access handle. The
+   * function call will block until one or more bytes of the data has been
+   * written successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write_at function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some_at(boost::uint64_t offset,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return this->service.write_some_at(
+        this->implementation, offset, buffers, ec);
+  }
+
+  /// Start an asynchronous write at the specified offset.
+  /**
+   * This function is used to asynchronously write data to the random-access
+   * handle. The function call always returns immediately.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write_at function if you need to ensure that
+   * all data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_write_some_at(42, asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some_at(boost::uint64_t offset,
+      const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    this->service.async_write_some_at(
+        this->implementation, offset, buffers, handler);
+  }
+
+  /// Read some data from the handle at the specified offset.
+  /**
+   * This function is used to read data from the random-access handle. The
+   * function call will block until one or more bytes of data has been read
+   * successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read_at function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.read_some_at(42, asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some_at(boost::uint64_t offset,
+      const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.read_some_at(
+        this->implementation, offset, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Read some data from the handle at the specified offset.
+  /**
+   * This function is used to read data from the random-access handle. The
+   * function call will block until one or more bytes of data has been read
+   * successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read_at function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some_at(boost::uint64_t offset,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return this->service.read_some_at(
+        this->implementation, offset, buffers, ec);
+  }
+
+  /// Start an asynchronous read at the specified offset.
+  /**
+   * This function is used to asynchronously read data from the random-access
+   * handle. The function call always returns immediately.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read_at function if you need to ensure that
+   * the requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_read_some_at(42, asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some_at(boost::uint64_t offset,
+      const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    this->service.async_read_some_at(
+        this->implementation, offset, buffers, handler);
+  }
+};
+
+} // namespace windows
+} // namespace asio
+
+#endif // defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_BASIC_RANDOM_ACCESS_HANDLE_HPP
diff --git a/ext/asio/windows/basic_stream_handle.hpp b/ext/asio/windows/basic_stream_handle.hpp
new file mode 100644
index 0000000000..48e7153da6
--- /dev/null
+++ b/ext/asio/windows/basic_stream_handle.hpp
@@ -0,0 +1,302 @@
+//
+// basic_stream_handle.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_BASIC_STREAM_HANDLE_HPP
+#define ASIO_WINDOWS_BASIC_STREAM_HANDLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/windows/basic_handle.hpp"
+#include "asio/windows/stream_handle_service.hpp"
+#include "asio/detail/throw_error.hpp"
+
+#if defined(ASIO_HAS_WINDOWS_STREAM_HANDLE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace windows {
+
+/// Provides stream-oriented handle functionality.
+/**
+ * The windows::basic_stream_handle class template provides asynchronous and
+ * blocking stream-oriented handle functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
+ */
+template <typename StreamHandleService = stream_handle_service>
+class basic_stream_handle
+  : public basic_handle<StreamHandleService>
+{
+public:
+  /// The native representation of a handle.
+  typedef typename StreamHandleService::native_type native_type;
+
+  /// Construct a basic_stream_handle without opening it.
+  /**
+   * This constructor creates a stream handle without opening it. The handle
+   * needs to be opened and then connected or accepted before data can be sent
+   * or received on it.
+   *
+   * @param io_service The io_service object that the stream handle will use to
+   * dispatch handlers for any asynchronous operations performed on the handle.
+   */
+  explicit basic_stream_handle(asio::io_service& io_service)
+    : basic_handle<StreamHandleService>(io_service)
+  {
+  }
+
+  /// Construct a basic_stream_handle on an existing native handle.
+  /**
+   * This constructor creates a stream handle object to hold an existing native
+   * handle.
+   *
+   * @param io_service The io_service object that the stream handle will use to
+   * dispatch handlers for any asynchronous operations performed on the handle.
+   *
+   * @param native_handle The new underlying handle implementation.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  basic_stream_handle(asio::io_service& io_service,
+      const native_type& native_handle)
+    : basic_handle<StreamHandleService>(io_service, native_handle)
+  {
+  }
+
+  /// Write some data to the handle.
+  /**
+   * This function is used to write data to the stream handle. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.write_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.write_some(this->implementation, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Write some data to the handle.
+  /**
+   * This function is used to write data to the stream handle. The function call
+   * will block until one or more bytes of the data has been written
+   * successfully, or until an error occurs.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.write_some(this->implementation, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  /**
+   * This function is used to asynchronously write data to the stream handle.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write function if you need to ensure that all
+   * data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_write_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(const ConstBufferSequence& buffers,
+      WriteHandler handler)
+  {
+    this->service.async_write_some(this->implementation, buffers, handler);
+  }
+
+  /// Read some data from the handle.
+  /**
+   * This function is used to read data from the stream handle. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws asio::system_error Thrown on failure. An error code of
+   * asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.read_some(asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers)
+  {
+    asio::error_code ec;
+    std::size_t s = this->service.read_some(this->implementation, buffers, ec);
+    asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Read some data from the handle.
+  /**
+   * This function is used to read data from the stream handle. The function
+   * call will block until one or more bytes of data has been read successfully,
+   * or until an error occurs.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some(const MutableBufferSequence& buffers,
+      asio::error_code& ec)
+  {
+    return this->service.read_some(this->implementation, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  /**
+   * This function is used to asynchronously read data from the stream handle.
+   * The function call always returns immediately.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_service::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read function if you need to ensure that the
+   * requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_read_some(asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(const MutableBufferSequence& buffers,
+      ReadHandler handler)
+  {
+    this->service.async_read_some(this->implementation, buffers, handler);
+  }
+};
+
+} // namespace windows
+} // namespace asio
+
+#endif // defined(ASIO_HAS_WINDOWS_STREAM_HANDLE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_BASIC_STREAM_HANDLE_HPP
diff --git a/ext/asio/windows/overlapped_ptr.hpp b/ext/asio/windows/overlapped_ptr.hpp
new file mode 100644
index 0000000000..087170b5a0
--- /dev/null
+++ b/ext/asio/windows/overlapped_ptr.hpp
@@ -0,0 +1,118 @@
+//
+// overlapped_ptr.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_OVERLAPPED_PTR_HPP
+#define ASIO_WINDOWS_OVERLAPPED_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/io_service.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/win_iocp_overlapped_ptr.hpp"
+
+#if !defined(ASIO_DISABLE_WINDOWS_OVERLAPPED_PTR)
+# if defined(ASIO_HAS_IOCP)
+#  define ASIO_HAS_WINDOWS_OVERLAPPED_PTR 1
+# endif // defined(ASIO_HAS_IOCP)
+#endif // !defined(ASIO_DISABLE_WINDOWS_OVERLAPPED_PTR)
+
+#if defined(ASIO_HAS_WINDOWS_OVERLAPPED_PTR) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace windows {
+
+/// Wraps a handler to create an OVERLAPPED object for use with overlapped I/O.
+/**
+ * A special-purpose smart pointer used to wrap an application handler so that
+ * it can be passed as the LPOVERLAPPED argument to overlapped I/O functions.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class overlapped_ptr
+  : private noncopyable
+{
+public:
+  /// Construct an empty overlapped_ptr.
+  overlapped_ptr()
+    : impl_()
+  {
+  }
+
+  /// Construct an overlapped_ptr to contain the specified handler.
+  template <typename Handler>
+  explicit overlapped_ptr(asio::io_service& io_service, Handler handler)
+    : impl_(io_service, handler)
+  {
+  }
+
+  /// Destructor automatically frees the OVERLAPPED object unless released.
+  ~overlapped_ptr()
+  {
+  }
+
+  /// Reset to empty.
+  void reset()
+  {
+    impl_.reset();
+  }
+
+  /// Reset to contain the specified handler, freeing any current OVERLAPPED
+  /// object.
+  template <typename Handler>
+  void reset(asio::io_service& io_service, Handler handler)
+  {
+    impl_.reset(io_service, handler);
+  }
+
+  /// Get the contained OVERLAPPED object.
+  OVERLAPPED* get()
+  {
+    return impl_.get();
+  }
+
+  /// Get the contained OVERLAPPED object.
+  const OVERLAPPED* get() const
+  {
+    return impl_.get();
+  }
+
+  /// Release ownership of the OVERLAPPED object.
+  OVERLAPPED* release()
+  {
+    return impl_.release();
+  }
+
+  /// Post completion notification for overlapped operation. Releases ownership.
+  void complete(const asio::error_code& ec,
+      std::size_t bytes_transferred)
+  {
+    impl_.complete(ec, bytes_transferred);
+  }
+
+private:
+  detail::win_iocp_overlapped_ptr impl_;
+};
+
+} // namespace windows
+} // namespace asio
+
+#endif // defined(ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_OVERLAPPED_PTR_HPP
diff --git a/ext/asio/windows/random_access_handle.hpp b/ext/asio/windows/random_access_handle.hpp
new file mode 100644
index 0000000000..6e5dd7b6fc
--- /dev/null
+++ b/ext/asio/windows/random_access_handle.hpp
@@ -0,0 +1,39 @@
+//
+// random_access_handle.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_HPP
+#define ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/windows/basic_random_access_handle.hpp"
+
+#if defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace windows {
+
+/// Typedef for the typical usage of a random-access handle.
+typedef basic_random_access_handle<> random_access_handle;
+
+} // namespace windows
+} // namespace asio
+
+#endif // defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_HPP
diff --git a/ext/asio/windows/random_access_handle_service.hpp b/ext/asio/windows/random_access_handle_service.hpp
new file mode 100644
index 0000000000..2e579f82e6
--- /dev/null
+++ b/ext/asio/windows/random_access_handle_service.hpp
@@ -0,0 +1,180 @@
+//
+// random_access_handle_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_SERVICE_HPP
+#define ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/win_iocp_handle_service.hpp"
+
+#if !defined(ASIO_DISABLE_WINDOWS_RANDOM_ACCESS_HANDLE)
+# if defined(ASIO_HAS_IOCP)
+#  define ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE 1
+# endif // defined(ASIO_HAS_IOCP)
+#endif // !defined(ASIO_DISABLE_WINDOWS_RANDOM_ACCESS_HANDLE)
+
+#if defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace windows {
+
+/// Default service implementation for a random-access handle.
+class random_access_handle_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<random_access_handle_service>
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+private:
+  // The type of the platform-specific implementation.
+  typedef detail::win_iocp_handle_service service_impl_type;
+
+public:
+  /// The type of a random-access handle implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native handle type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new random-access handle service for the specified io_service.
+  explicit random_access_handle_service(asio::io_service& io_service)
+    : asio::detail::service_base<
+        random_access_handle_service>(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new random-access handle implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a random-access handle implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Assign an existing native handle to a random-access handle.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_handle, asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, native_handle, ec);
+  }
+
+  /// Determine whether the handle is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Close a random-access handle implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native handle implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the handle.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Write the given data at the specified offset.
+  template <typename ConstBufferSequence>
+  std::size_t write_some_at(implementation_type& impl, boost::uint64_t offset,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.write_some_at(impl, offset, buffers, ec);
+  }
+
+  /// Start an asynchronous write at the specified offset.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some_at(implementation_type& impl, boost::uint64_t offset,
+      const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    service_impl_.async_write_some_at(impl, offset, buffers, handler);
+  }
+
+  /// Read some data from the specified offset.
+  template <typename MutableBufferSequence>
+  std::size_t read_some_at(implementation_type& impl, boost::uint64_t offset,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.read_some_at(impl, offset, buffers, ec);
+  }
+
+  /// Start an asynchronous read at the specified offset.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some_at(implementation_type& impl, boost::uint64_t offset,
+      const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    service_impl_.async_read_some_at(impl, offset, buffers, handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace windows
+} // namespace asio
+
+#endif // defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_SERVICE_HPP
diff --git a/ext/asio/windows/stream_handle.hpp b/ext/asio/windows/stream_handle.hpp
new file mode 100644
index 0000000000..d55dc3174a
--- /dev/null
+++ b/ext/asio/windows/stream_handle.hpp
@@ -0,0 +1,39 @@
+//
+// stream_handle.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_STREAM_HANDLE_HPP
+#define ASIO_WINDOWS_STREAM_HANDLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/windows/basic_stream_handle.hpp"
+
+#if defined(ASIO_HAS_WINDOWS_STREAM_HANDLE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace windows {
+
+/// Typedef for the typical usage of a stream-oriented handle.
+typedef basic_stream_handle<> stream_handle;
+
+} // namespace windows
+} // namespace asio
+
+#endif // defined(ASIO_HAS_WINDOWS_STREAM_HANDLE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_STREAM_HANDLE_HPP
diff --git a/ext/asio/windows/stream_handle_service.hpp b/ext/asio/windows/stream_handle_service.hpp
new file mode 100644
index 0000000000..75eff60a6e
--- /dev/null
+++ b/ext/asio/windows/stream_handle_service.hpp
@@ -0,0 +1,178 @@
+//
+// stream_handle_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WINDOWS_STREAM_HANDLE_SERVICE_HPP
+#define ASIO_WINDOWS_STREAM_HANDLE_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/error.hpp"
+#include "asio/io_service.hpp"
+#include "asio/detail/service_base.hpp"
+#include "asio/detail/win_iocp_handle_service.hpp"
+
+#if !defined(ASIO_DISABLE_WINDOWS_STREAM_HANDLE)
+# if defined(ASIO_HAS_IOCP)
+#  define ASIO_HAS_WINDOWS_STREAM_HANDLE 1
+# endif // defined(ASIO_HAS_IOCP)
+#endif // !defined(ASIO_DISABLE_WINDOWS_STREAM_HANDLE)
+
+#if defined(ASIO_HAS_WINDOWS_STREAM_HANDLE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace windows {
+
+/// Default service implementation for a stream handle.
+class stream_handle_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_service::service
+#else
+  : public asio::detail::service_base<stream_handle_service>
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_service::id id;
+#endif
+
+private:
+  // The type of the platform-specific implementation.
+  typedef detail::win_iocp_handle_service service_impl_type;
+
+public:
+  /// The type of a stream handle implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// The native handle type.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_type;
+#else
+  typedef service_impl_type::native_type native_type;
+#endif
+
+  /// Construct a new stream handle service for the specified io_service.
+  explicit stream_handle_service(asio::io_service& io_service)
+    : asio::detail::service_base<stream_handle_service>(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  /// Construct a new stream handle implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a stream handle implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Assign an existing native handle to a stream handle.
+  asio::error_code assign(implementation_type& impl,
+      const native_type& native_handle, asio::error_code& ec)
+  {
+    return service_impl_.assign(impl, native_handle, ec);
+  }
+
+  /// Determine whether the handle is open.
+  bool is_open(const implementation_type& impl) const
+  {
+    return service_impl_.is_open(impl);
+  }
+
+  /// Close a stream handle implementation.
+  asio::error_code close(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.close(impl, ec);
+  }
+
+  /// Get the native handle implementation.
+  native_type native(implementation_type& impl)
+  {
+    return service_impl_.native(impl);
+  }
+
+  /// Cancel all asynchronous operations associated with the handle.
+  asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Write the given data to the stream.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.write_some(impl, buffers, ec);
+  }
+
+  /// Start an asynchronous write.
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some(implementation_type& impl,
+      const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    service_impl_.async_write_some(impl, buffers, handler);
+  }
+
+  /// Read some data from the stream.
+  template <typename MutableBufferSequence>
+  std::size_t read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, asio::error_code& ec)
+  {
+    return service_impl_.read_some(impl, buffers, ec);
+  }
+
+  /// Start an asynchronous read.
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some(implementation_type& impl,
+      const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    service_impl_.async_read_some(impl, buffers, handler);
+  }
+
+private:
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace windows
+} // namespace asio
+
+#endif // defined(ASIO_HAS_WINDOWS_STREAM_HANDLE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WINDOWS_STREAM_HANDLE_SERVICE_HPP
diff --git a/ext/asio/write.hpp b/ext/asio/write.hpp
new file mode 100644
index 0000000000..2b188cde4c
--- /dev/null
+++ b/ext/asio/write.hpp
@@ -0,0 +1,540 @@
+//
+// write.hpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WRITE_HPP
+#define ASIO_WRITE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_streambuf.hpp"
+#include "asio/error.hpp"
+
+namespace asio {
+
+/**
+ * @defgroup write asio::write
+ *
+ * @brief Write a certain amount of data to a stream before returning.
+ */
+/*@{*/
+
+/// Write all of the supplied data to a stream before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a stream.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * write_some function.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the SyncWriteStream concept.
+ *
+ * @param buffers One or more buffers containing the data to be written. The sum
+ * of the buffer sizes indicates the maximum number of bytes to write to the
+ * stream.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code asio::write(s, asio::buffer(data, size)); @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::write(
+ *     s, buffers,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncWriteStream, typename ConstBufferSequence>
+std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers);
+
+/// Write a certain amount of data to a stream before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a stream.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * write_some function.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the SyncWriteStream concept.
+ *
+ * @param buffers One or more buffers containing the data to be written. The sum
+ * of the buffer sizes indicates the maximum number of bytes to write to the
+ * stream.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the stream's write_some function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code asio::write(s, asio::buffer(data, size),
+ *     asio::transfer_at_least(32)); @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename SyncWriteStream, typename ConstBufferSequence,
+    typename CompletionCondition>
+std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition);
+
+/// Write a certain amount of data to a stream before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a stream.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * write_some function.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the SyncWriteStream concept.
+ *
+ * @param buffers One or more buffers containing the data to be written. The sum
+ * of the buffer sizes indicates the maximum number of bytes to write to the
+ * stream.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the stream's write_some function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes written. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncWriteStream, typename ConstBufferSequence,
+    typename CompletionCondition>
+std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Write all of the supplied data to a stream before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a stream.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * write_some function.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the SyncWriteStream concept.
+ *
+ * @param b The basic_streambuf object from which data will be written.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::write(
+ *     s, b,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncWriteStream, typename Allocator>
+std::size_t write(SyncWriteStream& s, basic_streambuf<Allocator>& b);
+
+/// Write a certain amount of data to a stream before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a stream.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * write_some function.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the SyncWriteStream concept.
+ *
+ * @param b The basic_streambuf object from which data will be written.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the stream's write_some function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ */
+template <typename SyncWriteStream, typename Allocator,
+    typename CompletionCondition>
+std::size_t write(SyncWriteStream& s, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition);
+
+/// Write a certain amount of data to a stream before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a stream.
+ * The call will block until one of the following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * write_some function.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the SyncWriteStream concept.
+ *
+ * @param b The basic_streambuf object from which data will be written.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the stream's write_some function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes written. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncWriteStream, typename Allocator,
+    typename CompletionCondition>
+std::size_t write(SyncWriteStream& s, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, asio::error_code& ec);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+/**
+ * @defgroup async_write asio::async_write
+ *
+ * @brief Start an asynchronous operation to write a certain amount of data to a
+ * stream.
+ */
+/*@{*/
+
+/// Start an asynchronous operation to write all of the supplied data to a
+/// stream.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions
+ * is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_write_some function, and is known as a <em>composed operation</em>. The
+ * program must ensure that the stream performs no other write operations (such
+ * as async_write, the stream's async_write_some function, or any other composed
+ * operations that perform writes) until this operation completes.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the AsyncWriteStream concept.
+ *
+ * @param buffers One or more buffers containing the data to be written.
+ * Although the buffers object may be copied as necessary, ownership of the
+ * underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of
+ * the handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes written from the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be less than the sum
+ *                                           // of the buffer sizes.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code
+ * asio::async_write(s, asio::buffer(data, size), handler);
+ * @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename AsyncWriteStream, typename ConstBufferSequence,
+    typename WriteHandler>
+void async_write(AsyncWriteStream& s, const ConstBufferSequence& buffers,
+    WriteHandler handler);
+
+/// Start an asynchronous operation to write a certain amount of data to a
+/// stream.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions
+ * is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_write_some function, and is known as a <em>composed operation</em>. The
+ * program must ensure that the stream performs no other write operations (such
+ * as async_write, the stream's async_write_some function, or any other composed
+ * operations that perform writes) until this operation completes.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the AsyncWriteStream concept.
+ *
+ * @param buffers One or more buffers containing the data to be written.
+ * Although the buffers object may be copied as necessary, ownership of the
+ * underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_write_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the stream's async_write_some function.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes written from the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be less than the sum
+ *                                           // of the buffer sizes.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code asio::async_write(s,
+ *     asio::buffer(data, size),
+ *     asio::transfer_at_least(32),
+ *     handler); @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename AsyncWriteStream, typename ConstBufferSequence,
+    typename CompletionCondition, typename WriteHandler>
+void async_write(AsyncWriteStream& s, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, WriteHandler handler);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Start an asynchronous operation to write all of the supplied data to a
+/// stream.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions
+ * is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_write_some function, and is known as a <em>composed operation</em>. The
+ * program must ensure that the stream performs no other write operations (such
+ * as async_write, the stream's async_write_some function, or any other composed
+ * operations that perform writes) until this operation completes.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the AsyncWriteStream concept.
+ *
+ * @param b A basic_streambuf object from which data will be written. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes written from the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be less than the sum
+ *                                           // of the buffer sizes.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ */
+template <typename AsyncWriteStream, typename Allocator, typename WriteHandler>
+void async_write(AsyncWriteStream& s, basic_streambuf<Allocator>& b,
+    WriteHandler handler);
+
+/// Start an asynchronous operation to write a certain amount of data to a
+/// stream.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a stream. The function call always returns immediately. The
+ * asynchronous operation will continue until one of the following conditions
+ * is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the stream's
+ * async_write_some function, and is known as a <em>composed operation</em>. The
+ * program must ensure that the stream performs no other write operations (such
+ * as async_write, the stream's async_write_some function, or any other composed
+ * operations that perform writes) until this operation completes.
+ *
+ * @param s The stream to which the data is to be written. The type must support
+ * the AsyncWriteStream concept.
+ *
+ * @param b A basic_streambuf object from which data will be written. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_write_some operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the stream's async_write_some function.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   const asio::error_code& error, // Result of operation.
+ *
+ *   std::size_t bytes_transferred           // Number of bytes written from the
+ *                                           // buffers. If an error occurred,
+ *                                           // this will be less than the sum
+ *                                           // of the buffer sizes.
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ */
+template <typename AsyncWriteStream, typename Allocator,
+    typename CompletionCondition, typename WriteHandler>
+void async_write(AsyncWriteStream& s, basic_streambuf<Allocator>& b,
+    CompletionCondition completion_condition, WriteHandler handler);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+
+} // namespace asio
+
+#include "asio/impl/write.ipp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WRITE_HPP
diff --git a/ext/asio/write_at.hpp b/ext/asio/write_at.hpp
new file mode 100644
index 0000000000..5690bcfda1
--- /dev/null
+++ b/ext/asio/write_at.hpp
@@ -0,0 +1,563 @@
+//
+// write_at.hpp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_WRITE_AT_HPP
+#define ASIO_WRITE_AT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/push_options.hpp"
+
+#include "asio/detail/push_options.hpp"
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/basic_streambuf.hpp"
+#include "asio/error.hpp"
+
+namespace asio {
+
+/**
+ * @defgroup write_at asio::write_at
+ *
+ * @brief Write a certain amount of data at a specified offset before returning.
+ */
+/*@{*/
+
+/// Write all of the supplied data at the specified offset before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a random
+ * access device at a specified offset. The call will block until one of the
+ * following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the SyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param buffers One or more buffers containing the data to be written. The sum
+ * of the buffer sizes indicates the maximum number of bytes to write to the
+ * device.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code asio::write_at(d, 42, asio::buffer(data, size)); @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::write_at(
+ *     d, offset, buffers,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence>
+std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers);
+
+/// Write a certain amount of data at a specified offset before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a random
+ * access device at a specified offset. The call will block until one of the
+ * following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the SyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param buffers One or more buffers containing the data to be written. The sum
+ * of the buffer sizes indicates the maximum number of bytes to write to the
+ * device.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the device's write_some_at function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code asio::write_at(d, 42, asio::buffer(data, size),
+ *     asio::transfer_at_least(32)); @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename CompletionCondition>
+std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition);
+
+/// Write a certain amount of data at a specified offset before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a random
+ * access device at a specified offset. The call will block until one of the
+ * following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the SyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param buffers One or more buffers containing the data to be written. The sum
+ * of the buffer sizes indicates the maximum number of bytes to write to the
+ * device.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the device's write_some_at function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes written. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename CompletionCondition>
+std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, asio::error_code& ec);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Write all of the supplied data at the specified offset before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a random
+ * access device at a specified offset. The call will block until one of the
+ * following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the SyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param b The basic_streambuf object from which data will be written.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note This overload is equivalent to calling:
+ * @code asio::write_at(
+ *     d, 42, b,
+ *     asio::transfer_all()); @endcode
+ */
+template <typename SyncRandomAccessWriteDevice, typename Allocator>
+std::size_t write_at(SyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, basic_streambuf<Allocator>& b);
+
+/// Write a certain amount of data at a specified offset before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a random
+ * access device at a specified offset. The call will block until one of the
+ * following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the SyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param b The basic_streambuf object from which data will be written.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the device's write_some_at function.
+ *
+ * @returns The number of bytes transferred.
+ *
+ * @throws asio::system_error Thrown on failure.
+ */
+template <typename SyncRandomAccessWriteDevice, typename Allocator,
+    typename CompletionCondition>
+std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset,
+    basic_streambuf<Allocator>& b, CompletionCondition completion_condition);
+
+/// Write a certain amount of data at a specified offset before returning.
+/**
+ * This function is used to write a certain number of bytes of data to a random
+ * access device at a specified offset. The call will block until one of the
+ * following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the SyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param b The basic_streambuf object from which data will be written.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest write_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the device's write_some_at function.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @returns The number of bytes written. If an error occurs, returns the total
+ * number of bytes successfully transferred prior to the error.
+ */
+template <typename SyncRandomAccessWriteDevice, typename Allocator,
+    typename CompletionCondition>
+std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset,
+    basic_streambuf<Allocator>& b, CompletionCondition completion_condition,
+    asio::error_code& ec);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+/**
+ * @defgroup async_write_at asio::async_write_at
+ *
+ * @brief Start an asynchronous operation to write a certain amount of data at
+ * the specified offset.
+ */
+/*@{*/
+
+/// Start an asynchronous operation to write all of the supplied data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a random access device at a specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * async_write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the AsyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param buffers One or more buffers containing the data to be written.
+ * Although the buffers object may be copied as necessary, ownership of the
+ * underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of
+ * the handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes written from the buffers. If an error
+ *   // occurred, this will be less than the sum of the buffer sizes.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code
+ * asio::async_write_at(d, 42, asio::buffer(data, size), handler);
+ * @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename WriteHandler>
+void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset,
+    const ConstBufferSequence& buffers, WriteHandler handler);
+
+/// Start an asynchronous operation to write a certain amount of data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a random access device at a specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li All of the data in the supplied buffers has been written. That is, the
+ * bytes transferred is equal to the sum of the buffer sizes.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * async_write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the AsyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param buffers One or more buffers containing the data to be written.
+ * Although the buffers object may be copied as necessary, ownership of the
+ * underlying memory blocks is retained by the caller, which must guarantee
+ * that they remain valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_write_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the device's async_write_some_at function.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes written from the buffers. If an error
+ *   // occurred, this will be less than the sum of the buffer sizes.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ *
+ * @par Example
+ * To write a single data buffer use the @ref buffer function as follows:
+ * @code asio::async_write_at(d, 42,
+ *     asio::buffer(data, size),
+ *     asio::transfer_at_least(32),
+ *     handler); @endcode
+ * See the @ref buffer documentation for information on writing multiple
+ * buffers in one go, and how to use it with arrays, boost::array or
+ * std::vector.
+ */
+template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
+    typename CompletionCondition, typename WriteHandler>
+void async_write_at(AsyncRandomAccessWriteDevice& d,
+    boost::uint64_t offset, const ConstBufferSequence& buffers,
+    CompletionCondition completion_condition, WriteHandler handler);
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+/// Start an asynchronous operation to write all of the supplied data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a random access device at a specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li An error occurred.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * async_write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the AsyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param b A basic_streambuf object from which data will be written. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes written from the buffers. If an error
+ *   // occurred, this will be less than the sum of the buffer sizes.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ */
+template <typename AsyncRandomAccessWriteDevice, typename Allocator,
+    typename WriteHandler>
+void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset,
+    basic_streambuf<Allocator>& b, WriteHandler handler);
+
+/// Start an asynchronous operation to write a certain amount of data at the
+/// specified offset.
+/**
+ * This function is used to asynchronously write a certain number of bytes of
+ * data to a random access device at a specified offset. The function call
+ * always returns immediately. The asynchronous operation will continue until
+ * one of the following conditions is true:
+ *
+ * @li All of the data in the supplied basic_streambuf has been written.
+ *
+ * @li The completion_condition function object returns 0.
+ *
+ * This operation is implemented in terms of zero or more calls to the device's
+ * async_write_some_at function.
+ *
+ * @param d The device to which the data is to be written. The type must support
+ * the AsyncRandomAccessWriteDevice concept.
+ *
+ * @param offset The offset at which the data will be written.
+ *
+ * @param b A basic_streambuf object from which data will be written. Ownership
+ * of the streambuf is retained by the caller, which must guarantee that it
+ * remains valid until the handler is called.
+ *
+ * @param completion_condition The function object to be called to determine
+ * whether the write operation is complete. The signature of the function object
+ * must be:
+ * @code std::size_t completion_condition(
+ *   // Result of latest async_write_some_at operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes transferred so far.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * A return value of 0 indicates that the write operation is complete. A
+ * non-zero return value indicates the maximum number of bytes to be written on
+ * the next call to the device's async_write_some_at function.
+ *
+ * @param handler The handler to be called when the write operation completes.
+ * Copies will be made of the handler as required. The function signature of the
+ * handler must be:
+ * @code void handler(
+ *   // Result of operation.
+ *   const asio::error_code& error,
+ *
+ *   // Number of bytes written from the buffers. If an error
+ *   // occurred, this will be less than the sum of the buffer sizes.
+ *   std::size_t bytes_transferred
+ * ); @endcode
+ * Regardless of whether the asynchronous operation completes immediately or
+ * not, the handler will not be invoked from within this function. Invocation of
+ * the handler will be performed in a manner equivalent to using
+ * asio::io_service::post().
+ */
+template <typename AsyncRandomAccessWriteDevice, typename Allocator,
+    typename CompletionCondition, typename WriteHandler>
+void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset,
+    basic_streambuf<Allocator>& b, CompletionCondition completion_condition,
+    WriteHandler handler);
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+/*@}*/
+
+} // namespace asio
+
+#include "asio/impl/write_at.ipp"
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_WRITE_AT_HPP