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Make non-MVCC snapshots exempt from predicate locking. Scans with non-MVCC

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snapshots, like in REINDEX, are basically non-transactional operations. The
DDL operation itself might participate in SSI, but there's separate
functions for that.

Kevin Grittner and Dan Ports, with some changes by me.
This commit is contained in:
Heikki Linnakangas
2011-06-15 11:43:05 +03:00
parent 707195c8f4
commit 0a0e2b52a5
6 changed files with 151 additions and 100 deletions
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9
src/include/storage/predicate.h
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@@ -44,16 +44,17 @@ extern bool PageIsPredicateLocked(const Relation relation, const BlockNumber blk
/* predicate lock maintenance */
extern Snapshot RegisterSerializableTransaction(Snapshot snapshot);
extern void RegisterPredicateLockingXid(const TransactionId xid);
extern void PredicateLockRelation(const Relation relation);
extern void PredicateLockPage(const Relation relation, const BlockNumber blkno);
extern void PredicateLockTuple(const Relation relation, const HeapTuple tuple);
extern void PredicateLockRelation(const Relation relation, const Snapshot snapshot);
extern void PredicateLockPage(const Relation relation, const BlockNumber blkno, const Snapshot snapshot);
extern void PredicateLockTuple(const Relation relation, const HeapTuple tuple, const Snapshot snapshot);
extern void PredicateLockPageSplit(const Relation relation, const BlockNumber oldblkno, const BlockNumber newblkno);
extern void PredicateLockPageCombine(const Relation relation, const BlockNumber oldblkno, const BlockNumber newblkno);
extern void TransferPredicateLocksToHeapRelation(const Relation relation);
extern void ReleasePredicateLocks(const bool isCommit);
/* conflict detection (may also trigger rollback) */
extern void CheckForSerializableConflictOut(const bool valid, const Relation relation, const HeapTuple tuple, const Buffer buffer);
extern void CheckForSerializableConflictOut(const bool valid, const Relation relation, const HeapTuple tuple,
const Buffer buffer, const Snapshot snapshot);
extern void CheckForSerializableConflictIn(const Relation relation, const HeapTuple tuple, const Buffer buffer);
extern void CheckTableForSerializableConflictIn(const Relation relation);