mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix race condition in ConditionVariablePrepareToSleep.

Browse Source 
Thomas Munro
This commit is contained in:
Robert Haas 2017-02-09 14:42:32 -05:00
parent fc8219dc54
commit 3f3d60d3bb
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/backend/storage/lmgr/condition_variable.c
View File

@ -71,14 +71,17 @@ ConditionVariablePrepareToSleep(ConditionVariable *cv)
&MyProc->procLatch, NULL);
}
/*
* Reset my latch before adding myself to the queue and before entering
* the caller's predicate loop.
*/
ResetLatch(&MyProc->procLatch);
/* Add myself to the wait queue. */
SpinLockAcquire(&cv->mutex);
if (!proclist_contains(&cv->wakeup, pgprocno, cvWaitLink))
proclist_push_tail(&cv->wakeup, pgprocno, cvWaitLink);
SpinLockRelease(&cv->mutex);
/* Reset my latch before entering the caller's predicate loop. */
ResetLatch(&MyProc->procLatch);
}
/*--------------------------------------------------------------------------