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//
// detail/std_fenced_block.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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 ASIO_DETAIL_STD_FENCED_BLOCK_HPP
#define ASIO_DETAIL_STD_FENCED_BLOCK_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_HAS_STD_ATOMIC)
#include <atomic>
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class std_fenced_block
: private noncopyable
{
public:
enum half_t { half };
enum full_t { full };
// Constructor for a half fenced block.
explicit std_fenced_block(half_t)
{
}
// Constructor for a full fenced block.
explicit std_fenced_block(full_t)
{
std::atomic_thread_fence(std::memory_order_acquire);
}
// Destructor.
~std_fenced_block()
{
std::atomic_thread_fence(std::memory_order_release);
}
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_HAS_STD_ATOMIC)
#endif // ASIO_DETAIL_STD_FENCED_BLOCK_HPP
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