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Code Activity

Modify sequence state storage to eliminate dangling-pointer problem

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exemplified by bug #671.  Moving the storage to relcache turned out to
be a bad idea because relcache might decide to discard the info.  Instead,
open and close the relcache entry on each sequence operation, and use
a record of the current XID to discover whether we already hold
AccessShareLock on the sequence.
This commit is contained in:
Tom Lane
2002-05-22 21:40:55 +00:00
parent b8ffc99602
commit a2597ef179
5 changed files with 161 additions and 147 deletions
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3
src/include/commands/sequence.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: sequence.h,v 1.19 2001/11/05 17:46:33 momjian Exp $
* $Id: sequence.h,v 1.20 2002/05/22 21:40:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -84,7 +84,6 @@ extern Datum setval(PG_FUNCTION_ARGS);
extern Datum setval_and_iscalled(PG_FUNCTION_ARGS);
extern void DefineSequence(CreateSeqStmt *stmt);
extern void CloseSequences(void);
extern void seq_redo(XLogRecPtr lsn, XLogRecord *rptr);
extern void seq_undo(XLogRecPtr lsn, XLogRecord *rptr);