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Truncate predicate lock manager's SLRU lazily at checkpoint. That's safer

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than doing it aggressively whenever the tail-XID pointer is advanced, because
this way we don't need to do it while holding SerializableXactHashLock.

This also fixes bug #5915 spotted by YAMAMOTO Takashi, and removes an
obsolete comment spotted by Kevin Grittner.
This commit is contained in:
Heikki Linnakangas
2011-03-08 12:07:29 +02:00
parent 804d13adfd
commit 4cd3fb6e12
3 changed files with 69 additions and 52 deletions
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src/include/storage/predicate.h
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@@ -36,6 +36,8 @@ extern int max_predicate_locks_per_xact;
extern void InitPredicateLocks(void);
extern Size PredicateLockShmemSize(void);
extern void CheckPointPredicate(void);
/* predicate lock reporting */
extern bool PageIsPredicateLocked(const Relation relation, const BlockNumber blkno);