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diff --git a/ext/asio/detail/posix_event.hpp b/ext/asio/detail/posix_event.hpp
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+++ b/ext/asio/detail/posix_event.hpp
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+//
+// 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