Chris@16: //
Chris@16: // detail/win_fenced_block.hpp
Chris@16: // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
Chris@16: #define BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/detail/config.hpp>
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_WINDOWS) && !defined(UNDER_CE)
Chris@16: 
Chris@16: #include <boost/asio/detail/socket_types.hpp>
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: namespace detail {
Chris@16: 
Chris@16: class win_fenced_block
Chris@16:   : private noncopyable
Chris@16: {
Chris@16: public:
Chris@16:   enum half_t { half };
Chris@16:   enum full_t { full };
Chris@16: 
Chris@16:   // Constructor for a half fenced block.
Chris@16:   explicit win_fenced_block(half_t)
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@16:   // Constructor for a full fenced block.
Chris@16:   explicit win_fenced_block(full_t)
Chris@16:   {
Chris@16: #if defined(__BORLANDC__)
Chris@16:     LONG barrier = 0;
Chris@16:     ::InterlockedExchange(&barrier, 1);
Chris@16: #elif defined(BOOST_ASIO_MSVC) \
Chris@16:   && ((BOOST_ASIO_MSVC < 1400) || !defined(MemoryBarrier))
Chris@16: # if defined(_M_IX86)
Chris@16: #  pragma warning(push)
Chris@16: #  pragma warning(disable:4793)
Chris@16:     LONG barrier;
Chris@16:     __asm { xchg barrier, eax }
Chris@16: #  pragma warning(pop)
Chris@16: # endif // defined(_M_IX86)
Chris@16: #else
Chris@16:     MemoryBarrier();
Chris@16: #endif
Chris@16:   }
Chris@16: 
Chris@16:   // Destructor.
Chris@16:   ~win_fenced_block()
Chris@16:   {
Chris@16: #if defined(__BORLANDC__)
Chris@16:     LONG barrier = 0;
Chris@16:     ::InterlockedExchange(&barrier, 1);
Chris@16: #elif defined(BOOST_ASIO_MSVC) \
Chris@16:   && ((BOOST_ASIO_MSVC < 1400) || !defined(MemoryBarrier))
Chris@16: # if defined(_M_IX86)
Chris@16: #  pragma warning(push)
Chris@16: #  pragma warning(disable:4793)
Chris@16:     LONG barrier;
Chris@16:     __asm { xchg barrier, eax }
Chris@16: #  pragma warning(pop)
Chris@16: # endif // defined(_M_IX86)
Chris@16: #else
Chris@16:     MemoryBarrier();
Chris@16: #endif
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // defined(BOOST_ASIO_WINDOWS) && !defined(UNDER_CE)
Chris@16: 
Chris@16: #endif // BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP