ceph/src/boost/boost/atomic/detail/fence_arch_ops_msvc_arm.hpp

   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_arch_ops_msvc_arm.hpp
  10  *
  11  * This header contains implementation of the \c fence_arch_operations struct.
  12  */
  13
  14 #ifndef BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_MSVC_ARM_HPP_INCLUDED_
  15 #define BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_MSVC_ARM_HPP_INCLUDED_
  16
  17 #include <boost/memory_order.hpp>
  18 #include <boost/atomic/detail/config.hpp>
  19 #include <boost/atomic/detail/ops_msvc_common.hpp>
  20 #include <boost/atomic/detail/header.hpp>
  21
  22 #ifdef BOOST_HAS_PRAGMA_ONCE
  23 #pragma once
  24 #endif
  25
  26 extern "C" void __dmb(unsigned int);
  27 #if defined(BOOST_MSVC)
  28 #pragma intrinsic(__dmb)
  29 #endif
  30
  31 namespace boost {
  32 namespace atomics {
  33 namespace detail {
  34
  35 //! Fence operations for ARM
  36 struct fence_arch_operations_msvc_arm
  37 {
  38     static BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
  39     {
  40         BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
  41         if (order != memory_order_relaxed)
  42             hardware_full_fence();
  43         BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
  44     }
  45
  46     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
  52     static BOOST_FORCEINLINE void hardware_full_fence() BOOST_NOEXCEPT
  53     {
  54         __dmb(0xB); // _ARM_BARRIER_ISH, see armintr.h from MSVC 11 and later
  55     }
  56 };
  57
  58 typedef fence_arch_operations_msvc_arm fence_arch_operations;
  59
  60 } // namespace detail
  61 } // namespace atomics
  62 } // namespace boost
  63
  64 #include <boost/atomic/detail/footer.hpp>
  65
  66 #endif // BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_MSVC_ARM_HPP_INCLUDED_