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Clean up some longstanding problems in shared-cache invalidation.

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SI messages now include the relevant database OID, so that operations
in one database do not cause useless cache flushes in backends attached
to other databases.  Declare SI messages properly using a union, to
eliminate the former assumption that Oid is the same size as int or Index.
Rewrite the nearly-unreadable code in inval.c, and document it better.
Arrange for catcache flushes at end of command/transaction to happen before
relcache flushes do --- this avoids loading a new tuple into the catcache
while setting up new relcache entry, only to have it be flushed again
immediately.
This commit is contained in:
Tom Lane
2001-06-19 19:42:16 +00:00
parent d9a069e224
commit bbbc00af88
10 changed files with 533 additions and 733 deletions
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7
src/include/utils/catcache.h
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@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: catcache.h,v 1.33 2001/06/18 03:35:07 tgl Exp $
* $Id: catcache.h,v 1.34 2001/06/19 19:42:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -36,6 +36,7 @@ typedef struct catcache
char *cc_relname; /* name of relation the tuples come from */
char *cc_indname; /* name of index matching cache keys */
int cc_reloidattr; /* AttrNumber of relation OID, or 0 */
bool cc_relisshared; /* is relation shared? */
TupleDesc cc_tupdesc; /* tuple descriptor (copied from reldesc) */
int cc_ntup; /* # of tuples currently in this cache */
int cc_size; /* # of hash buckets in this cache */
@ -98,7 +99,7 @@ extern void CatalogCacheFlushRelation(Oid relId);
extern void CatalogCacheIdInvalidate(int cacheId, Index hashIndex,
ItemPointer pointer);
extern void PrepareToInvalidateCacheTuple(Relation relation,
HeapTuple tuple,
void (*function) (int, Index, ItemPointer));
HeapTuple tuple,
void (*function) (int, Index, ItemPointer, Oid));
#endif /* CATCACHE_H */

9
src/include/utils/inval.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: inval.h,v 1.19 2001/01/24 19:43:28 momjian Exp $
* $Id: inval.h,v 1.20 2001/06/19 19:42:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,11 +16,12 @@
#include "access/htup.h"
extern void DiscardInvalid(void);
extern void RegisterInvalid(bool send);
extern void AcceptInvalidationMessages(void);
extern void ImmediateLocalInvalidation(bool send);
extern void AtEOXactInvalidationMessages(bool isCommit);
extern void CommandEndInvalidationMessages(bool isCommit);
extern void RelationInvalidateHeapTuple(Relation relation, HeapTuple tuple);