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Install infrastructure for shared-memory free space map. Doesn't actually

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do anything yet, but it has the necessary connections to initialization
and so forth.  Make some gestures towards allowing number of blocks in
a relation to be BlockNumber, ie, unsigned int, rather than signed int.
(I doubt I got all the places that are sloppy about it, yet.)  On the
way, replace the hardwired NLOCKS_PER_XACT fudge factor with a GUC
variable.
This commit is contained in:
Tom Lane
2001-06-27 23:31:40 +00:00
parent b559382134
commit e0c9301c87
26 changed files with 572 additions and 316 deletions
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7
src/backend/access/hash/hashpage.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/hash/hashpage.c,v 1.30 2001/03/07 21:20:26 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/hash/hashpage.c,v 1.31 2001/06/27 23:31:37 tgl Exp $
*
* NOTES
* Postgres hash pages look like ordinary relation pages. The opaque
@@ -70,18 +70,15 @@ _hash_metapinit(Relation rel)
int nbuckets;
uint32 nelem; /* number elements */
uint32 lg2nelem; /* _hash_log2(nelem) */
uint32 nblocks;
uint16 i;
/* can't be sharing this with anyone, now... */
if (USELOCKING)
LockRelation(rel, AccessExclusiveLock);
if ((nblocks = RelationGetNumberOfBlocks(rel)) != 0)
{
if (RelationGetNumberOfBlocks(rel) != 0)
elog(ERROR, "Cannot initialize non-empty hash table %s",
RelationGetRelationName(rel));
}
metabuf = _hash_getbuf(rel, HASH_METAPAGE, HASH_WRITE);
pg = BufferGetPage(metabuf);