atomic/detail/fence_ops_windows.hpp

0001 /*
0002  * Distributed under the Boost Software License, Version 1.0.
0003  * (See accompanying file LICENSE_1_0.txt or copy at
0004  * http://www.boost.org/LICENSE_1_0.txt)
0005  *
0006  * Copyright (c) 2020 Andrey Semashev
0007  */
0008 /*!
0009  * \file   atomic/detail/fence_ops_windows.hpp
0010  *
0011  * This header contains implementation of the \c fence_operations struct.
0012  */
0013
0014 #ifndef BOOST_ATOMIC_DETAIL_FENCE_OPS_WINDOWS_HPP_INCLUDED_
0015 #define BOOST_ATOMIC_DETAIL_FENCE_OPS_WINDOWS_HPP_INCLUDED_
0016
0017 #include <boost/cstdint.hpp>
0018 #include <boost/memory_order.hpp>
0019 #include <boost/atomic/detail/config.hpp>
0020 #include <boost/atomic/detail/interlocked.hpp>
0021 #include <boost/atomic/detail/ops_msvc_common.hpp>
0022 #include <boost/atomic/detail/header.hpp>
0023
0024 #ifdef BOOST_HAS_PRAGMA_ONCE
0025 #pragma once
0026 #endif
0027
0028 namespace boost {
0029 namespace atomics {
0030 namespace detail {
0031
0032 //! Fence operations based on Windows-specific system calls or intrinsics
0033 struct fence_operations_windows
0034 {
0035     static BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
0036     {
0037         if (order != memory_order_relaxed)
0038         {
0039             BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
0040             if (order == memory_order_seq_cst)
0041                 hardware_full_fence();
0042             BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
0043         }
0044     }
0045
0046     static BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
0047     {
0048         if (order != memory_order_relaxed)
0049             BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
0050     }
0051
0052     static BOOST_FORCEINLINE void hardware_full_fence() BOOST_NOEXCEPT
0053     {
0054         boost::uint32_t tmp;
0055         BOOST_ATOMIC_INTERLOCKED_INCREMENT(&tmp);
0056     }
0057 };
0058
0059 typedef fence_operations_windows fence_operations;
0060
0061 } // namespace detail
0062 } // namespace atomics
0063 } // namespace boost
0064
0065 #include <boost/atomic/detail/footer.hpp>
0066
0067 #endif // BOOST_ATOMIC_DETAIL_FENCE_OPS_WINDOWS_HPP_INCLUDED_