git.sesse.net Git - casparcg/blob - dependencies64/boost/boost/atomic/fences.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) 2011 Helge Bahmann
   7  * Copyright (c) 2013 Tim Blechmann
   8  * Copyright (c) 2014 Andrey Semashev
   9  */
  10 /*!
  11  * \file   atomic/fences.hpp
  12  *
  13  * This header contains definition of \c atomic_thread_fence and \c atomic_signal_fence functions.
  14  */
  15
  16 #ifndef BOOST_ATOMIC_FENCES_HPP_INCLUDED_
  17 #define BOOST_ATOMIC_FENCES_HPP_INCLUDED_
  18
  19 #include <boost/memory_order.hpp>
  20 #include <boost/atomic/capabilities.hpp>
  21 #include <boost/atomic/detail/operations.hpp>
  22
  23 #ifdef BOOST_HAS_PRAGMA_ONCE
  24 #pragma once
  25 #endif
  26
  27 /*
  28  * IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE,
  29  *                      see comment for convert_memory_order_to_gcc in ops_gcc_atomic.hpp.
  30  */
  31
  32 namespace boost {
  33
  34 namespace atomics {
  35
  36 #if BOOST_ATOMIC_THREAD_FENCE > 0
  37 BOOST_FORCEINLINE void atomic_thread_fence(memory_order order) BOOST_NOEXCEPT
  38 {
  39     detail::thread_fence(order);
  40 }
  41 #else
  42 BOOST_FORCEINLINE void atomic_thread_fence(memory_order) BOOST_NOEXCEPT
  43 {
  44     detail::lockpool::thread_fence();
  45 }
  46 #endif
  47
  48 #if BOOST_ATOMIC_SIGNAL_FENCE > 0
  49 BOOST_FORCEINLINE void atomic_signal_fence(memory_order order) BOOST_NOEXCEPT
  50 {
  51     detail::signal_fence(order);
  52 }
  53 #else
  54 BOOST_FORCEINLINE void atomic_signal_fence(memory_order) BOOST_NOEXCEPT
  55 {
  56     detail::lockpool::signal_fence();
  57 }
  58 #endif
  59
  60 } // namespace atomics
  61
  62 using atomics::atomic_thread_fence;
  63 using atomics::atomic_signal_fence;
  64
  65 } // namespace boost
  66
  67 #endif // BOOST_ATOMIC_FENCES_HPP_INCLUDED_