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diff --git a/boost/asio/detail/win_fenced_block.hpp b/boost/asio/detail/win_fenced_block.hpp
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+++ b/boost/asio/detail/win_fenced_block.hpp
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+//
+// detail/win_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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 BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
+#define BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+
+#include <boost/asio/detail/socket_types.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class win_fenced_block
+  : private noncopyable
+{
+public:
+  enum half_t { half };
+  enum full_t { full };
+
+  // Constructor for a half fenced block.
+  explicit win_fenced_block(half_t)
+  {
+  }
+
+  // Constructor for a full fenced block.
+  explicit win_fenced_block(full_t)
+  {
+#if defined(__BORLANDC__)
+    LONG barrier = 0;
+    ::InterlockedExchange(&barrier, 1);
+#elif defined(BOOST_MSVC) && ((BOOST_MSVC < 1400) || !defined(MemoryBarrier))
+# 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
+    MemoryBarrier();
+#endif
+  }
+
+  // Destructor.
+  ~win_fenced_block()
+  {
+#if defined(__BORLANDC__)
+    LONG barrier = 0;
+    ::InterlockedExchange(&barrier, 1);
+#elif defined(BOOST_MSVC) && ((BOOST_MSVC < 1400) || !defined(MemoryBarrier))
+# 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
+    MemoryBarrier();
+#endif
+  }
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_WINDOWS) && !defined(UNDER_CE)
+
+#endif // BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP