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Diffstat (limited to 'src/backend/storage/lmgr/predicate.c')
| -rw-r--r-- | src/backend/storage/lmgr/predicate.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/backend/storage/lmgr/predicate.c b/src/backend/storage/lmgr/predicate.c index 48ff9cc151..3b3158efe5 100644 --- a/src/backend/storage/lmgr/predicate.c +++ b/src/backend/storage/lmgr/predicate.c @@ -2283,6 +2283,9 @@ PredicateLockTupleRowVersionLink(const Relation relation, * locks. Even if a serializable transaction starts concurrently, * we know it can't take any SIREAD locks on the modified tuple * because the caller is holding the associated buffer page lock. + * Memory reordering isn't an issue; the memory barrier in the + * LWLock acquisition guarantees that this read occurs while the + * buffer page lock is held. */ if (!TransactionIdIsValid(PredXact->SxactGlobalXmin)) return; |