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 pause()30BOOST_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_ 44