91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
//
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// detail/win_fenced_block.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
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#define ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_WINDOWS) && !defined(UNDER_CE)
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#include "asio/detail/socket_types.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class win_fenced_block
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: private noncopyable
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{
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public:
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enum half_t { half };
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enum full_t { full };
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// Constructor for a half fenced block.
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explicit win_fenced_block(half_t)
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{
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}
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// Constructor for a full fenced block.
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explicit win_fenced_block(full_t)
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{
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#if defined(__BORLANDC__)
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LONG barrier = 0;
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::InterlockedExchange(&barrier, 1);
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#elif defined(ASIO_MSVC) \
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&& ((ASIO_MSVC < 1400) || !defined(MemoryBarrier))
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# if defined(_M_IX86)
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# pragma warning(push)
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# pragma warning(disable:4793)
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LONG barrier;
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__asm { xchg barrier, eax }
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# pragma warning(pop)
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# endif // defined(_M_IX86)
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#else
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MemoryBarrier();
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#endif
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}
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// Destructor.
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~win_fenced_block()
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{
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#if defined(__BORLANDC__)
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LONG barrier = 0;
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::InterlockedExchange(&barrier, 1);
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#elif defined(ASIO_MSVC) \
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&& ((ASIO_MSVC < 1400) || !defined(MemoryBarrier))
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# if defined(_M_IX86)
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# pragma warning(push)
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# pragma warning(disable:4793)
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LONG barrier;
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__asm { xchg barrier, eax }
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# pragma warning(pop)
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# endif // defined(_M_IX86)
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#else
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MemoryBarrier();
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#endif
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}
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(ASIO_WINDOWS) && !defined(UNDER_CE)
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#endif // ASIO_DETAIL_WIN_FENCED_BLOCK_HPP
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