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Change yield_k to not use sp_thread_yield; using sp_thread_sleep is always strictly superior, at least on Windows

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This commit is contained in:
Peter Dimov
2020-06-07 21:24:21 +03:00
parent 8afe162910
commit 72ca834ae8
1 changed files with 8 additions and 5 deletions
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13
include/boost/smart_ptr/detail/yield_k.hpp
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@@ -175,14 +175,17 @@ namespace detail
inline void yield( unsigned k ) BOOST_NOEXCEPT inline void yield( unsigned k ) BOOST_NOEXCEPT
{ {
if( k < 16 ) // Experiments show that a simple sp_thread_sleep() here is best;
// leave a few pause instructions out of mostly superstition.
// (These are verified to not degrade performance.)
//
// There seems to be no benefit from calling sp_thread_yield()
// at any time.
if( k < 8 )
{ {
BOOST_SMT_PAUSE BOOST_SMT_PAUSE
} }
else if( k < 32 )
{
sp_thread_yield();
}
else else
{ {
sp_thread_sleep(); sp_thread_sleep();