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| author | Cédric Villemain | 2011-05-13 20:55:39 +0000 |
|---|---|---|
| committer | Cédric Villemain | 2011-05-13 20:55:39 +0000 |
| commit | e0c3b474d5436c7874aef36988f2646bdb890249 (patch) | |
| tree | 49c41d2b8abbd9bae4096643d840859f3a02a08c /src/backend/storage | |
| parent | 40cefa392974c73ec20deb3c15fb5111ed7fad17 (diff) | |
| parent | 9bb6d9795253bb521f81c626fea49a704a369ca9 (diff) | |
Merge branch 'master' into analyze_cacheanalyze_cache
Diffstat (limited to 'src/backend/storage')
| -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; |