atomic/detail/fence_arch_ops_msvc_arm.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_arch_ops_msvc_arm.hpp
0010  *
0011  * This header contains implementation of the \c fence_arch_operations struct.
0012  */
0013
0014 #ifndef BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_MSVC_ARM_HPP_INCLUDED_
0015 #define BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_MSVC_ARM_HPP_INCLUDED_
0016
0017 #include <boost/memory_order.hpp>
0018 #include <boost/atomic/detail/config.hpp>
0019 #include <boost/atomic/detail/ops_msvc_common.hpp>
0020 #include <boost/atomic/detail/header.hpp>
0021
0022 #ifdef BOOST_HAS_PRAGMA_ONCE
0023 #pragma once
0024 #endif
0025
0026 extern "C" void __dmb(unsigned int);
0027 #if defined(BOOST_MSVC)
0028 #pragma intrinsic(__dmb)
0029 #endif
0030
0031 namespace boost {
0032 namespace atomics {
0033 namespace detail {
0034
0035 //! Fence operations for ARM
0036 struct fence_arch_operations_msvc_arm
0037 {
0038     static BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
0039     {
0040         BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
0041         if (order != memory_order_relaxed)
0042             hardware_full_fence();
0043         BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
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         __dmb(0xB); // _ARM_BARRIER_ISH, see armintr.h from MSVC 11 and later
0055     }
0056 };
0057
0058 typedef fence_arch_operations_msvc_arm fence_arch_operations;
0059
0060 } // namespace detail
0061 } // namespace atomics
0062 } // namespace boost
0063
0064 #include <boost/atomic/detail/footer.hpp>
0065
0066 #endif // BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_MSVC_ARM_HPP_INCLUDED_