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  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 mars_boost {} namespace boost = mars_boost; namespace mars_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 mars_boost
  42.  
  43. #endif // BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
  44.  
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