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Sleep(0) changed to Sleep(1) to (hopefully) avoid livelocks.

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[SVN r14226]
This commit is contained in:
Peter Dimov
2002-06-22 15:55:01 +00:00
parent a322dc54dc
commit d84fa738ef
1 changed files with 8 additions and 3 deletions
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11
include/boost/detail/lwm_win32.hpp
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@ -57,7 +57,12 @@ public:
{ {
while( winapi::InterlockedExchange(&m_.l_, 1) ) while( winapi::InterlockedExchange(&m_.l_, 1) )
{ {
winapi::Sleep(0); // Note: changed to Sleep(1) from Sleep(0).
// According to MSDN, Sleep(0) will never yield
// to a lower-priority thread, whereas Sleep(1)
// will. Performance seems not to be affected.
winapi::Sleep(1);
} }
} }
@ -65,8 +70,8 @@ public:
{ {
winapi::InterlockedExchange(&m_.l_, 0); winapi::InterlockedExchange(&m_.l_, 0);
// Note: adding a Sleep(0) here will make // Note: adding a yield here will make
// the mutex more fair and will increase the overall // the spinlock more fair and will increase the overall
// performance of some applications substantially in // performance of some applications substantially in
// high contention situations, but will penalize the // high contention situations, but will penalize the
// low contention / single thread case up to 5x // low contention / single thread case up to 5x