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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/nbtree/nbtpage.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.16 1998/09/01 03:21:14 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.17 1998/12/15 12:45:23 vadim Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
@@ -93,7 +93,7 @@ _bt_metapinit(Relation rel)
/* can't be sharing this with anyone, now... */
if (USELOCKING)
RelationSetLockForWrite(rel);
LockRelation(rel, AccessExclusiveLock);
if ((nblocks = RelationGetNumberOfBlocks(rel)) != 0)
{
@@ -120,7 +120,7 @@ _bt_metapinit(Relation rel)
/* all done */
if (USELOCKING)
RelationUnsetLockForWrite(rel);
UnlockRelation(rel, AccessExclusiveLock);
}
#ifdef NOT_USED
@@ -571,32 +571,26 @@ _bt_getstackbuf(Relation rel, BTStack stack, int access)
static void
_bt_setpagelock(Relation rel, BlockNumber blkno, int access)
{
ItemPointerData iptr;
if (USELOCKING)
{
ItemPointerSet(&iptr, blkno, P_HIKEY);
if (access == BT_WRITE)
RelationSetSingleWLockPage(rel, &iptr);
LockPage(rel, blkno, ExclusiveLock);
else
RelationSetSingleRLockPage(rel, &iptr);
LockPage(rel, blkno, ShareLock);
}
}
static void
_bt_unsetpagelock(Relation rel, BlockNumber blkno, int access)
{
ItemPointerData iptr;
if (USELOCKING)
{
ItemPointerSet(&iptr, blkno, P_HIKEY);
if (access == BT_WRITE)
RelationUnsetSingleWLockPage(rel, &iptr);
UnlockPage(rel, blkno, ExclusiveLock);
else
RelationUnsetSingleRLockPage(rel, &iptr);
UnlockPage(rel, blkno, ShareLock);
}
}