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