| #ifndef BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED |
| #define BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED |
| |
| // MS compatible compilers support #pragma once |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| # pragma once |
| #endif |
| |
| // boost/smart_ptr/detail/yield_k.hpp |
| // |
| // Copyright 2008, 2020 Peter Dimov |
| // |
| // inline void boost::detail::yield( unsigned k ); |
| // |
| // Typical use: |
| // for( unsigned k = 0; !try_lock(); ++k ) yield( k ); |
| // |
| // Distributed under the Boost Software License, Version 1.0. |
| // https://www.boost.org/LICENSE_1_0.txt |
| |
| #include <boost/smart_ptr/detail/sp_thread_pause.hpp> |
| #include <boost/smart_ptr/detail/sp_thread_sleep.hpp> |
| #include <boost/config.hpp> |
| |
| namespace boost |
| { |
| |
| namespace detail |
| { |
| |
| inline void yield( unsigned k ) |
| { |
| // Experiments on Windows and Fedora 32 show that a single pause, |
| // followed by an immediate sp_thread_sleep(), is best. |
| |
| if( k == 0 ) |
| { |
| sp_thread_pause(); |
| } |
| else |
| { |
| sp_thread_sleep(); |
| } |
| } |
| |
| } // namespace detail |
| |
| } // namespace boost |
| |
| #endif // #ifndef BOOST_SMART_PTR_DETAIL_YIELD_K_HPP_INCLUDED |
