1 files changed, 71 insertions, 0 deletions
diff --git a/ext/asio/detail/completion_handler.hpp b/ext/asio/detail/completion_handler.hpp
new file mode 100644
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+++ 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