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_SYNC_DETAIL_PAUSE_HPP_INCLUDED_ 11 #define BOOST_SYNC_DETAIL_PAUSE_HPP_INCLUDED_ 12 13 #include <boost/sync/detail/config.hpp> 14 #include <boost/sync/detail/header.hpp> 15 16 #ifdef BOOST_HAS_PRAGMA_ONCE 17 #pragma once 18 #endif 19 20 #if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86)) 21 extern "C" void _mm_pause(void); 22 #pragma intrinsic(_mm_pause) 23 #endif 24 25 namespace boost { 26 namespace sync { 27 namespace detail { 28 pause()29BOOST_FORCEINLINE void pause() BOOST_NOEXCEPT 30 { 31 #if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86)) 32 _mm_pause(); 33 34 #elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) 35 __asm__ __volatile__("pause;"); 36 37 #endif 38 } 39 40 } // namespace detail 41 } // namespace sync 42 } // namespace boost 43 44 #include <boost/sync/detail/footer.hpp> 45 46 #endif // BOOST_SYNC_DETAIL_PAUSE_HPP_INCLUDED_ 47