| #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED |
| #define BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED |
| |
| // MS compatible compilers support #pragma once |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| # pragma once |
| #endif |
| |
| // boost/smart_ptr/detail/sp_thread_pause.hpp |
| // |
| // inline void bost::detail::sp_thread_pause(); |
| // |
| // Emits a "pause" instruction. |
| // |
| // Copyright 2008, 2020 Peter Dimov |
| // Distributed under the Boost Software License, Version 1.0 |
| // https://www.boost.org/LICENSE_1_0.txt |
| |
| #if defined(_MSC_VER) && _MSC_VER >= 1310 && ( defined(_M_IX86) || defined(_M_X64) ) && !defined(__c2__) |
| |
| extern "C" void _mm_pause(); |
| |
| #define BOOST_SP_PAUSE _mm_pause(); |
| |
| #elif defined(__GNUC__) && ( defined(__i386__) || defined(__x86_64__) ) |
| |
| #define BOOST_SP_PAUSE __asm__ __volatile__( "rep; nop" : : : "memory" ); |
| |
| #else |
| |
| #define BOOST_SP_PAUSE |
| |
| #endif |
| |
| namespace boost |
| { |
| namespace detail |
| { |
| |
| inline void sp_thread_pause() |
| { |
| BOOST_SP_PAUSE |
| } |
| |
| } // namespace detail |
| } // namespace boost |
| |
| #undef BOOST_SP_PAUSE |
| |
| #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED |
