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Ensure that a cursor has an immutable snapshot throughout its lifespan.

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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.
This commit is contained in:
Alvaro Herrera
2009-10-02 17:57:30 +00:00
parent fabf75cffc
commit caa4cfa369
6 changed files with 44 additions and 11 deletions
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3
src/include/utils/snapmgr.h
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@@ -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 1.6 2009/10/02 17:57:30 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);