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Diffstat (limited to 'boost/asio/detail/std_fenced_block.hpp')
-rw-r--r-- | boost/asio/detail/std_fenced_block.hpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/boost/asio/detail/std_fenced_block.hpp b/boost/asio/detail/std_fenced_block.hpp new file mode 100644 index 0000000000..b3bd9d5931 --- /dev/null +++ b/boost/asio/detail/std_fenced_block.hpp @@ -0,0 +1,64 @@ +// +// detail/std_fenced_block.hpp +// ~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2017 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_STD_FENCED_BLOCK_HPP +#define BOOST_ASIO_DETAIL_STD_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_HAS_STD_ATOMIC) + +#include <atomic> +#include <boost/asio/detail/noncopyable.hpp> + +#include <boost/asio/detail/push_options.hpp> + +namespace boost { +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 +} // namespace boost + +#include <boost/asio/detail/pop_options.hpp> + +#endif // defined(BOOST_ASIO_HAS_STD_ATOMIC) + +#endif // BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP |