ceph/src/boost/libs/atomic/include/boost/atomic/detail/pause.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  * (C) Copyright 2013 Tim Blechmann
   7  * (C) Copyright 2013 Andrey Semashev
   8  */
   9
  10 #ifndef BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
  11 #define BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
  12
  13 #include <boost/atomic/detail/config.hpp>
  14
  15 #ifdef BOOST_HAS_PRAGMA_ONCE
  16 #pragma once
  17 #endif
  18
  19 #if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86))
  20 extern "C" void _mm_pause(void);
  21 #if defined(BOOST_MSVC)
  22 #pragma intrinsic(_mm_pause)
  23 #endif
  24 #endif
  25
  26 namespace boost {
  27 namespace atomics {
  28 namespace detail {
  29
  30 BOOST_FORCEINLINE void pause() BOOST_NOEXCEPT
  31 {
  32 #if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86))
  33     _mm_pause();
  34 #elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
  35     __asm__ __volatile__("pause;");
  36 #endif
  37 }
  38
  39 } // namespace detail
  40 } // namespace atomics
  41 } // namespace boost
  42
  43 #endif // BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_