// // detail/win_fenced_block.hpp // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2011 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: // Constructor. 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 } // 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