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52 lines
1.1 KiB
52 lines
1.1 KiB
3 years ago
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#ifndef BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_YIELD_K_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/yield_k.hpp
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//
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// Copyright 2008, 2020 Peter Dimov
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//
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// inline void boost::detail::yield( unsigned k );
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//
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// Typical use:
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// for( unsigned k = 0; !try_lock(); ++k ) yield( k );
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//
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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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#include <boost/smart_ptr/detail/sp_thread_pause.hpp>
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#include <boost/smart_ptr/detail/sp_thread_sleep.hpp>
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#include <boost/config.hpp>
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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 yield( unsigned k )
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{
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// Experiments on Windows and Fedora 32 show that a single pause,
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// followed by an immediate sp_thread_sleep(), is best.
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if( k == 0 )
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{
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sp_thread_pause();
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}
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else
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{
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sp_thread_sleep();
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}
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}
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} // namespace detail
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} // namespace boost
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED
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