1 /* 2 * Distributed under the Boost Software License, Version 1.0. 3 * (See accompanying file LICENSE_1_0.txt or copy at 4 * http://www.boost.org/LICENSE_1_0.txt) 5 * 6 * Copyright (c) 2020 Andrey Semashev 7 */ 8 /*! 9 * \file atomic/detail/fence_ops_windows.hpp 10 * 11 * This header contains implementation of the \c fence_operations struct. 12 */ 13 14 #ifndef BOOST_ATOMIC_DETAIL_FENCE_OPS_WINDOWS_HPP_INCLUDED_ 15 #define BOOST_ATOMIC_DETAIL_FENCE_OPS_WINDOWS_HPP_INCLUDED_ 16 17 #include <boost/cstdint.hpp> 18 #include <boost/memory_order.hpp> 19 #include <boost/atomic/detail/config.hpp> 20 #include <boost/atomic/detail/interlocked.hpp> 21 #include <boost/atomic/detail/ops_msvc_common.hpp> 22 #include <boost/atomic/detail/header.hpp> 23 24 #ifdef BOOST_HAS_PRAGMA_ONCE 25 #pragma once 26 #endif 27 28 namespace boost { 29 namespace atomics { 30 namespace detail { 31 32 //! Fence operations based on Windows-specific system calls or intrinsics 33 struct fence_operations_windows 34 { thread_fenceboost::atomics::detail::fence_operations_windows35 static BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT 36 { 37 if (order != memory_order_relaxed) 38 { 39 BOOST_ATOMIC_DETAIL_COMPILER_BARRIER(); 40 if (order == memory_order_seq_cst) 41 hardware_full_fence(); 42 BOOST_ATOMIC_DETAIL_COMPILER_BARRIER(); 43 } 44 } 45 signal_fenceboost::atomics::detail::fence_operations_windows46 static BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT 47 { 48 if (order != memory_order_relaxed) 49 BOOST_ATOMIC_DETAIL_COMPILER_BARRIER(); 50 } 51 hardware_full_fenceboost::atomics::detail::fence_operations_windows52 static BOOST_FORCEINLINE void hardware_full_fence() BOOST_NOEXCEPT 53 { 54 boost::uint32_t tmp; 55 BOOST_ATOMIC_INTERLOCKED_INCREMENT(&tmp); 56 } 57 }; 58 59 typedef fence_operations_windows fence_operations; 60 61 } // namespace detail 62 } // namespace atomics 63 } // namespace boost 64 65 #include <boost/atomic/detail/footer.hpp> 66 67 #endif // BOOST_ATOMIC_DETAIL_FENCE_OPS_WINDOWS_HPP_INCLUDED_ 68