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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2009-10-02 17:58:21 +0000 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2009-10-02 17:58:21 +0000 |
| commit | ae35363dced47a99178b4a4129e3ea1f990b829c (patch) | |
| tree | c0a113330d1b9039764b82a1e59820c420b6fe7a /src/include/utils/snapmgr.h | |
| parent | d4bd8423c9939a30f0f29e70745917e4635b4973 (diff) | |
| download | postgresql-ae35363dced47a99178b4a4129e3ea1f990b829c.tar.gz postgresql-ae35363dced47a99178b4a4129e3ea1f990b829c.zip | |
Ensure that a cursor has an immutable snapshot throughout its lifespan.
The old coding was using a regular snapshot, referenced elsewhere, that was
subject to having its command counter updated. Fix by creating a private copy
of the snapshot exclusively for the cursor.
Backpatch to 8.4, which is when the bug was introduced during the snapshot
management rewrite.
Diffstat (limited to 'src/include/utils/snapmgr.h')
| -rw-r--r-- | src/include/utils/snapmgr.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/utils/snapmgr.h b/src/include/utils/snapmgr.h index 979a52c6224..d2186116023 100644 --- a/src/include/utils/snapmgr.h +++ b/src/include/utils/snapmgr.h @@ -6,7 +6,7 @@ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/utils/snapmgr.h,v 1.5 2009/06/11 14:49:13 momjian Exp $ + * $PostgreSQL: pgsql/src/include/utils/snapmgr.h,v 1.5.2.1 2009/10/02 17:58:21 alvherre Exp $ * *------------------------------------------------------------------------- */ @@ -26,6 +26,7 @@ extern TransactionId RecentGlobalXmin; extern Snapshot GetTransactionSnapshot(void); extern Snapshot GetLatestSnapshot(void); extern void SnapshotSetCommandId(CommandId curcid); +extern Snapshot CopySnapshot(Snapshot snapshot); extern void PushActiveSnapshot(Snapshot snapshot); extern void PushUpdatedSnapshot(Snapshot snapshot); |