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Initial MVCC code.

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New code for locking buffer' context.
This commit is contained in:
Vadim B. Mikheev
1998-12-15 12:47:01 +00:00
parent c5a27161a1
commit 3f7fbf85dc
65 changed files with 1391 additions and 1282 deletions
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20
src/backend/access/hash/hashpage.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/hash/hashpage.c,v 1.17 1998/09/01 03:20:58 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/hash/hashpage.c,v 1.18 1998/12/15 12:45:10 vadim Exp $
*
* NOTES
* Postgres hash pages look like ordinary relation pages. The opaque
@@ -81,7 +81,7 @@ _hash_metapinit(Relation rel)
/* can't be sharing this with anyone, now... */
if (USELOCKING)
RelationSetLockForWrite(rel);
LockRelation(rel, AccessExclusiveLock);
if ((nblocks = RelationGetNumberOfBlocks(rel)) != 0)
{
@@ -169,7 +169,7 @@ _hash_metapinit(Relation rel)
_hash_relbuf(rel, metabuf, HASH_WRITE);
if (USELOCKING)
RelationUnsetLockForWrite(rel);
UnlockRelation(rel, AccessExclusiveLock);
}
/*
@@ -316,19 +316,16 @@ _hash_setpagelock(Relation rel,
BlockNumber blkno,
int access)
{
ItemPointerData iptr;
if (USELOCKING)
{
ItemPointerSet(&iptr, blkno, 1);
switch (access)
{
case HASH_WRITE:
RelationSetSingleWLockPage(rel, &iptr);
LockPage(rel, blkno, ExclusiveLock);
break;
case HASH_READ:
RelationSetSingleRLockPage(rel, &iptr);
LockPage(rel, blkno, ShareLock);
break;
default:
elog(ERROR, "_hash_setpagelock: invalid access (%d) on blk %x: %s",
@@ -343,19 +340,16 @@ _hash_unsetpagelock(Relation rel,
BlockNumber blkno,
int access)
{
ItemPointerData iptr;
if (USELOCKING)
{
ItemPointerSet(&iptr, blkno, 1);
switch (access)
{
case HASH_WRITE:
RelationUnsetSingleWLockPage(rel, &iptr);
UnlockPage(rel, blkno, ExclusiveLock);
break;
case HASH_READ:
RelationUnsetSingleRLockPage(rel, &iptr);
UnlockPage(rel, blkno, ShareLock);
break;
default:
elog(ERROR, "_hash_unsetpagelock: invalid access (%d) on blk %x: %s",