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Commit78aaa0e

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Don't reset latch in ConditionVariablePrepareToSleep().
It's not OK to do that without calling CHECK_FOR_INTERRUPTS().Let the next wait loop deal with it, following the usual pattern.One consequence of this bug was that a SIGTERM delivered in a verynarrow timing window could leave a parallel worker process waitingforever for a condition variable that will never be signaled, afteran error was raised in other process.The code is a bit different in the stable branches due to commit1321509, making problems less likely there. No back-patch for now,but we may finish up deciding to make a similar change after morediscussion.Author: Thomas MunroReviewed-by: Shawn DebnathReported-by: Tomas VondraDiscussion:https://postgr.es/m/CA%2BhUKGJOm8zZHjVA8svoNT3tHY0XdqmaC_kHitmgXDQM49m1dA%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
@@ -93,12 +93,6 @@ ConditionVariablePrepareToSleep(ConditionVariable *cv)
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/* Record the condition variable on which we will sleep. */
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cv_sleep_target=cv;
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/*
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* Reset my latch before adding myself to the queue, to ensure that we
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* don't miss a wakeup that occurs immediately.
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*/
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ResetLatch(MyLatch);
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/* Add myself to the wait queue. */
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SpinLockAcquire(&cv->mutex);
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proclist_push_tail(&cv->wakeup,pgprocno,cvWaitLink);

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