63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
|
//
|
||
|
|
// detail/std_fenced_block.hpp
|
||
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
//
|
||
|
|
// Copyright (c) 2003-2021 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
|