Chris@102: /*
Chris@102:  * Distributed under the Boost Software License, Version 1.0.
Chris@102:  *    (See accompanying file LICENSE_1_0.txt or copy at
Chris@102:  *          http://www.boost.org/LICENSE_1_0.txt)
Chris@102:  *
Chris@102:  * (C) Copyright 2013 Tim Blechmann
Chris@102:  * (C) Copyright 2013 Andrey Semashev
Chris@102:  */
Chris@102: 
Chris@102: #ifndef BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
Chris@102: #define BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
Chris@102: 
Chris@102: #include <boost/atomic/detail/config.hpp>
Chris@102: 
Chris@102: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: #if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86))
Chris@102: extern "C" void _mm_pause(void);
Chris@102: #if defined(BOOST_MSVC)
Chris@102: #pragma intrinsic(_mm_pause)
Chris@102: #endif
Chris@102: #endif
Chris@102: 
Chris@102: namespace boost {
Chris@102: namespace atomics {
Chris@102: namespace detail {
Chris@102: 
Chris@102: BOOST_FORCEINLINE void pause() BOOST_NOEXCEPT
Chris@102: {
Chris@102: #if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86))
Chris@102:     _mm_pause();
Chris@102: #elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
Chris@102:     __asm__ __volatile__("pause;");
Chris@102: #endif
Chris@102: }
Chris@102: 
Chris@102: } // namespace detail
Chris@102: } // namespace atomics
Chris@102: } // namespace boost
Chris@102: 
Chris@102: #endif // BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_