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Warn if LOCKTAG_TUPLE is held at commit, under debug_assertions.

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The current use always releases this locktag.  A planned use will
continue that intent.  It will involve more areas of code, making unlock
omissions easier.  Warn under debug_assertions, like we do for various
resource leaks.  Back-patch to v12 (all supported versions), the plan
for the commit of the new use.

Reviewed by Heikki Linnakangas.

Discussion: https://postgr.es/m/20240512232923.aa.nmisch@google.com
This commit is contained in:
Noah Misch 2024-09-24 15:25:18 -07:00
parent ac30021356
commit dbf3f974ee
1 changed files with 10 additions and 0 deletions
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10
src/backend/storage/lmgr/lock.c
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@ -2305,6 +2305,16 @@ LockReleaseAll(LOCKMETHODID lockmethodid, bool allLocks)
locallock->numLockOwners = 0;
}
#ifdef USE_ASSERT_CHECKING
/*
* Tuple locks are currently held only for short durations within a
* transaction. Check that we didn't forget to release one.
*/
if (LOCALLOCK_LOCKTAG(*locallock) == LOCKTAG_TUPLE && !allLocks)
elog(WARNING, "tuple lock held at commit");
#endif
/*
* If the lock or proclock pointers are NULL, this lock was taken via
* the relation fast-path (and is not known to have been transferred).