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Commit122abf3

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committed
Fix LMGR for MVCC.
Get rid of Extend lock mode.
1 parent86bc1da commit122abf3

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7 files changed

+205
-217
lines changed

7 files changed

+205
-217
lines changed

‎src/backend/access/heap/hio.c

Lines changed: 7 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Id: hio.c,v 1.18 1999/05/01 15:04:46 vadim Exp $
10+
* $Id: hio.c,v 1.19 1999/05/07 01:22:53 vadim Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -111,14 +111,13 @@ RelationPutHeapTupleAtEnd(Relation relation, HeapTuple tuple)
111111
Itemitem;
112112

113113
/*
114-
* Actually, we lock _relation_ here, not page, but I believe
115-
* that locking page is faster... Obviously, we could get rid
116-
* of ExtendLock mode at all and use ExclusiveLock mode on
117-
* page 0, as long as we use page-level locking for indices only,
118-
* but we are in 6.5-beta currently...- vadim 05/01/99
114+
* Lock relation for extention. We can use LockPage here as long as
115+
* in all other places we use page-level locking for indices only.
116+
* Alternatevely, we could define pseudo-table as we do for
117+
* transactions with XactLockTable.
119118
*/
120119
if (!relation->rd_myxactonly)
121-
LockPage(relation,0,ExtendLock);
120+
LockPage(relation,0,ExclusiveLock);
122121

123122
/*
124123
* XXX This does an lseek - VERY expensive - but at the moment it is
@@ -166,7 +165,7 @@ RelationPutHeapTupleAtEnd(Relation relation, HeapTuple tuple)
166165
}
167166

168167
if (!relation->rd_myxactonly)
169-
UnlockPage(relation,0,ExtendLock);
168+
UnlockPage(relation,0,ExclusiveLock);
170169

171170
offnum=PageAddItem((Page)pageHeader, (Item)tuple->t_data,
172171
tuple->t_len,InvalidOffsetNumber,LP_USED);

‎src/backend/storage/lmgr/lmgr.c

Lines changed: 2 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.22 1999/02/1323:18:24 momjian Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.23 1999/05/07 01:23:02 vadim Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -79,9 +79,6 @@ static MASK LockConflicts[] = {
7979
(1 <<RowExclusiveLock) | (1 <<RowShareLock) | (1 <<AccessExclusiveLock) |
8080
(1 <<AccessShareLock),
8181

82-
/* ExtendLock */
83-
(1 <<ExtendLock)
84-
8582
};
8683

8784
staticintLockPrios[]= {
@@ -92,8 +89,7 @@ static intLockPrios[] = {
9289
4,
9390
5,
9491
6,
95-
7,
96-
1
92+
7
9793
};
9894

9995
LOCKMETHODLockTableId= (LOCKMETHOD)NULL;

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