//
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// detail/std_fenced_block.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2020 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 BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP
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#define BOOST_ASIO_DETAIL_STD_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 <boost/asio/detail/config.hpp>
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#if defined(BOOST_ASIO_HAS_STD_ATOMIC)
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#include <atomic>
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#include <boost/asio/detail/noncopyable.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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class std_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 std_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 std_fenced_block(full_t)
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{
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std::atomic_thread_fence(std::memory_order_acquire);
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}
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// Destructor.
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~std_fenced_block()
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{
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std::atomic_thread_fence(std::memory_order_release);
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}
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // defined(BOOST_ASIO_HAS_STD_ATOMIC)
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#endif // BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP
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