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Commitb91dd9d

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Forward received condition variable signals on cancel.
After a process decides not to wait for a condition variable, it canstill consume a signal before it reaches ConditionVariableCancelSleep().In that case, pass the signal on to another waiter if possible, so thata signal doesn't go missing when there is another process ready toreceive it.Author: Thomas MunroReviewed-by: Shawn DebnathDiscussion:https://postgr.es/m/CA%2BhUKGLQ_RW%2BXs8znDn36e-%2Bmq2--zrPemBqTQ8eKT-VO1OF4Q%40mail.gmail.com
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‎src/backend/storage/lmgr/condition_variable.c

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Original file line numberDiff line numberDiff line change
@@ -245,15 +245,26 @@ void
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ConditionVariableCancelSleep(void)
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{
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ConditionVariable*cv=cv_sleep_target;
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boolsignaled= false;
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if (cv==NULL)
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return;
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SpinLockAcquire(&cv->mutex);
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if (proclist_contains(&cv->wakeup,MyProc->pgprocno,cvWaitLink))
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proclist_delete(&cv->wakeup,MyProc->pgprocno,cvWaitLink);
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else
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signaled= true;
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SpinLockRelease(&cv->mutex);
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/*
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* If we've received a signal, pass it on to another waiting process, if
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* there is one. Otherwise a call to ConditionVariableSignal() might get
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* lost, despite there being another process ready to handle it.
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*/
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if (signaled)
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ConditionVariableSignal(cv);
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cv_sleep_target=NULL;
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}
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