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Use SwitchToThread instead of Sleep(0) is sp_thread_yield; the general consensus is that it's newer and 'smarter'

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This commit is contained in:
Peter Dimov 2023-06-18 21:54:13 +03:00
parent 8d6d20059a
commit 66890c3f3d
2 changed files with 4 additions and 2 deletions
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4
include/boost/core/detail/sp_thread_yield.hpp
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@ -24,7 +24,7 @@
#if defined( _WIN32 ) || defined( __WIN32__ ) || defined( __CYGWIN__ ) #if defined( _WIN32 ) || defined( __WIN32__ ) || defined( __CYGWIN__ )
#if defined(BOOST_SP_REPORT_IMPLEMENTATION) #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
BOOST_PRAGMA_MESSAGE("Using Sleep(0) in sp_thread_yield") BOOST_PRAGMA_MESSAGE("Using SwitchToThread() in sp_thread_yield")
#endif #endif
#include <boost/core/detail/sp_win32_sleep.hpp> #include <boost/core/detail/sp_win32_sleep.hpp>
@ -38,7 +38,7 @@ namespace detail
inline void sp_thread_yield() BOOST_NOEXCEPT inline void sp_thread_yield() BOOST_NOEXCEPT
{ {
Sleep( 0 ); SwitchToThread();
} }
} // namespace detail } // namespace detail

2
include/boost/core/detail/sp_win32_sleep.hpp
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@ -41,6 +41,8 @@ namespace detail
extern "C" __declspec(dllimport) void BOOST_CORE_SP_STDCALL Sleep( unsigned long ms ); extern "C" __declspec(dllimport) void BOOST_CORE_SP_STDCALL Sleep( unsigned long ms );
#endif #endif
extern "C" __declspec(dllimport) int BOOST_CORE_SP_STDCALL SwitchToThread();
#undef BOOST_CORE_SP_STDCALL #undef BOOST_CORE_SP_STDCALL
#endif // !defined( BOOST_USE_WINDOWS_H ) #endif // !defined( BOOST_USE_WINDOWS_H )