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//
// detail/win_fenced_block.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2014 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_ASIO_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_ASIO_MSVC) \
&& ((BOOST_ASIO_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_ASIO_MSVC) \
&& ((BOOST_ASIO_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_ASIO_WINDOWS) && !defined(UNDER_CE)
#endif // BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
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