*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.40 1999/05/25 16:07:23 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.41 1999/05/25 18:20:28 vadim Exp $
*
*-------------------------------------------------------------------------
*/
-#include
#include
#ifndef HAVE_MEMMOVE
/* find the page containing this key */
stack = _bt_search(rel, natts, itup_scankey, &buf);
- blkno = BufferGetBlockNumber(buf);
-
/* trade in our read lock for a write lock */
- _bt_relbuf(rel, buf, BT_READ);
+ LockBuffer(buf, BUFFER_LOCK_UNLOCK);
+ LockBuffer(buf, BT_WRITE);
l1:
- buf = _bt_getbuf(rel, blkno, BT_WRITE);
-
/*
* If the page was split between the time that we surrendered our read
* lock and acquired our write lock, then this page may no longer be
*/
buf = _bt_moveright(rel, buf, natts, itup_scankey, BT_WRITE);
+ blkno = BufferGetBlockNumber(buf);
/* if we're not allowing duplicates, make sure the key isn't */
/* already in the node */
/* key on the page before trying to compare it */
if (!PageIsEmpty(page) && offset <= maxoff)
{
- TupleDesc itupdesc;
- BTItem cbti;
- HeapTupleData htup;
- BTPageOpaque opaque;
- Buffer nbuf;
- BlockNumber blkno;
- bool chtup = true;
+ TupleDesc itupdesc;
+ BTItem cbti;
+ HeapTupleData htup;
+ BTPageOpaque opaque;
+ Buffer nbuf;
+ BlockNumber nblkno;
+ bool chtup = true;
itupdesc = RelationGetDescr(rel);
nbuf = InvalidBuffer;
_bt_relbuf(rel, nbuf, BT_READ);
_bt_relbuf(rel, buf, BT_WRITE);
XactLockTableWait(xwait);
- goto l1;/* continue from the begin */
+ buf = _bt_getbuf(rel, blkno, BT_WRITE);
+ goto l1; /* continue from the begin */
}
elog(ERROR, "Cannot insert a duplicate key into a unique index");
}
* min key of the right page is the same, ooh - so
* many dead duplicates...
*/
- blkno = opaque->btpo_next;
+ nblkno = opaque->btpo_next;
if (nbuf != InvalidBuffer)
_bt_relbuf(rel, nbuf, BT_READ);
- for (nbuf = InvalidBuffer;;)
+ for (nbuf = InvalidBuffer; ; )
{
- nbuf = _bt_getbuf(rel, blkno, BT_READ);
+ nbuf = _bt_getbuf(rel, nblkno, BT_READ);
page = BufferGetPage(nbuf);
maxoff = PageGetMaxOffsetNumber(page);
opaque = (BTPageOpaque) PageGetSpecialPointer(page);
}
else
{ /* Empty or "pseudo"-empty page - get next */
- blkno = opaque->btpo_next;
+ nblkno = opaque->btpo_next;
_bt_relbuf(rel, nbuf, BT_READ);
nbuf = InvalidBuffer;
- if (blkno == P_NONE)
+ if (nblkno == P_NONE)
break;
}
}
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.21 1999/05/25 16:07:26 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtpage.c,v 1.22 1999/05/25 18:20:29 vadim Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
#include
#include
-#include
#include
#ifndef HAVE_MEMMOVE
#include
#endif
-static void _bt_setpagelock(Relation rel, BlockNumber blkno, int access);
-static void _bt_unsetpagelock(Relation rel, BlockNumber blkno, int access);
-
#define BTREE_METAPAGE 0
#define BTREE_MAGIC 0x053162
-#ifdef BTREE_VERSION_1
#define BTREE_VERSION 1
-#else
-#define BTREE_VERSION 0
-#endif
typedef struct BTMetaPageData
{
uint32 btm_magic;
uint32 btm_version;
BlockNumber btm_root;
-#ifdef BTREE_VERSION_1
int32 btm_level;
-#endif
} BTMetaPageData;
#define BTPageGetMeta(p) \
metad.btm_magic = BTREE_MAGIC;
metad.btm_version = BTREE_VERSION;
metad.btm_root = P_NONE;
-#ifdef BTREE_VERSION_1
metad.btm_level = 0;
-#endif
memmove((char *) BTPageGetMeta(pg), (char *) &metad, sizeof(metad));
op = (BTPageOpaque) PageGetSpecialPointer(pg);
rootblkno = BufferGetBlockNumber(rootbuf);
rootpg = BufferGetPage(rootbuf);
metad->btm_root = rootblkno;
-#ifdef BTREE_VERSION_1
metad->btm_level = 1;
-#endif
_bt_pageinit(rootpg, BufferGetPageSize(rootbuf));
rootopaque = (BTPageOpaque) PageGetSpecialPointer(rootpg);
rootopaque->btpo_flags |= (BTP_LEAF | BTP_ROOT);
/* swap write lock for read lock, if appropriate */
if (access != BT_WRITE)
{
- _bt_setpagelock(rel, rootblkno, BT_READ);
- _bt_unsetpagelock(rel, rootblkno, BT_WRITE);
+ LockBuffer(rootbuf, BUFFER_LOCK_UNLOCK);
+ LockBuffer(rootbuf, BT_READ);
}
/* okay, metadata is correct */
Buffer buf;
Page page;
- /*
- * If we want a new block, we can't set a lock of the appropriate type
- * until we've instantiated the buffer.
- */
-
if (blkno != P_NEW)
{
- if (access == BT_WRITE)
- _bt_setpagelock(rel, blkno, BT_WRITE);
- else
- _bt_setpagelock(rel, blkno, BT_READ);
-
buf = ReadBuffer(rel, blkno);
+ LockBuffer(buf, access);
}
else
{
+ /*
+ * Extend bufmgr code is unclean and so we have to
+ * use locking here.
+ */
+ LockPage(rel, 0, ExclusiveLock);
buf = ReadBuffer(rel, blkno);
+ UnlockPage(rel, 0, ExclusiveLock);
blkno = BufferGetBlockNumber(buf);
page = BufferGetPage(buf);
_bt_pageinit(page, BufferGetPageSize(buf));
-
- if (access == BT_WRITE)
- _bt_setpagelock(rel, blkno, BT_WRITE);
- else
- _bt_setpagelock(rel, blkno, BT_READ);
+ LockBuffer(buf, access);
}
/* ref count and lock type are correct */
void
_bt_relbuf(Relation rel, Buffer buf, int access)
{
- BlockNumber blkno;
-
- blkno = BufferGetBlockNumber(buf);
-
- /* access had better be one of read or write */
- if (access == BT_WRITE)
- _bt_unsetpagelock(rel, blkno, BT_WRITE);
- else
- _bt_unsetpagelock(rel, blkno, BT_READ);
-
+ LockBuffer(buf, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buf);
}
void
_bt_wrtbuf(Relation rel, Buffer buf)
{
- BlockNumber blkno;
-
- blkno = BufferGetBlockNumber(buf);
+ LockBuffer(buf, BUFFER_LOCK_UNLOCK);
WriteBuffer(buf);
- _bt_unsetpagelock(rel, blkno, BT_WRITE);
}
/*
void
_bt_wrtnorelbuf(Relation rel, Buffer buf)
{
- BlockNumber blkno;
-
- blkno = BufferGetBlockNumber(buf);
WriteNoReleaseBuffer(buf);
}
Assert(metaopaque->btpo_flags & BTP_META);
metad = BTPageGetMeta(metap);
metad->btm_root = rootbknum;
-#ifdef BTREE_VERSION_1
- if (level == 0) /* called from _do_insert */
+ if (level == 0) /* called from _do_insert */
metad->btm_level += 1;
else
metad->btm_level = level; /* called from btsort */
-#endif
_bt_wrtbuf(rel, metabuf);
}
}
}
-static void
-_bt_setpagelock(Relation rel, BlockNumber blkno, int access)
-{
-
- if (USELOCKING)
- {
- if (access == BT_WRITE)
- LockPage(rel, blkno, ExclusiveLock);
- else
- LockPage(rel, blkno, ShareLock);
- }
-}
-
-static void
-_bt_unsetpagelock(Relation rel, BlockNumber blkno, int access)
-{
-
- if (USELOCKING)
- {
- if (access == BT_WRITE)
- UnlockPage(rel, blkno, ExclusiveLock);
- else
- UnlockPage(rel, blkno, ShareLock);
- }
-}
-
void
_bt_pagedel(Relation rel, ItemPointer tid)
{
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.38 1999/05/25 16:07:27 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.39 1999/05/25 18:20:29 vadim Exp $
*
* NOTES
* This file contains only the public interface routines.
/*
* Restore scan position using heap TID returned by previous call
- * to btgettuple().
+ * to btgettuple(). _bt_restscan() locks buffer.
*/
_bt_restscan(scan);
res = _bt_next(scan, dir);
else
res = _bt_first(scan, dir);
- /* Save heap TID to use it in _bt_restscan */
+ /*
+ * Save heap TID to use it in _bt_restscan.
+ * Unlock buffer before leaving index !
+ */
if (res)
+ {
((BTScanOpaque) scan->opaque)->curHeapIptr = res->heap_iptr;
+ LockBuffer(((BTScanOpaque) scan->opaque)->btso_curbuf, BUFFER_LOCK_UNLOCK);
+ }
return (char *) res;
}
so = (BTScanOpaque) scan->opaque;
- /* we hold a read lock on the current page in the scan */
+ /* we don't hold a read lock on the current page in the scan */
if (ItemPointerIsValid(iptr = &(scan->currentItemData)))
{
- _bt_relbuf(scan->relation, so->btso_curbuf, BT_READ);
+ ReleaseBuffer(so->btso_curbuf);
so->btso_curbuf = InvalidBuffer;
ItemPointerSetInvalid(iptr);
}
- /* and we hold a read lock on the last marked item in the scan */
+ /* and we don't hold a read lock on the last marked item in the scan */
if (ItemPointerIsValid(iptr = &(scan->currentMarkData)))
{
- _bt_relbuf(scan->relation, so->btso_mrkbuf, BT_READ);
+ ReleaseBuffer(so->btso_mrkbuf);
so->btso_mrkbuf = InvalidBuffer;
ItemPointerSetInvalid(iptr);
}
so = (BTScanOpaque) scan->opaque;
- /* release any locks we still hold */
+ /* we don't hold a read lock on the current page in the scan */
if (ItemPointerIsValid(iptr = &(scan->currentItemData)))
{
- _bt_relbuf(scan->relation, so->btso_curbuf, BT_READ);
+ ReleaseBuffer(so->btso_curbuf);
so->btso_curbuf = InvalidBuffer;
ItemPointerSetInvalid(iptr);
}
so = (BTScanOpaque) scan->opaque;
- /* release any locks we still hold */
+ /* we don't hold any read locks */
if (ItemPointerIsValid(iptr = &(scan->currentItemData)))
{
if (BufferIsValid(so->btso_curbuf))
- _bt_relbuf(scan->relation, so->btso_curbuf, BT_READ);
+ ReleaseBuffer(so->btso_curbuf);
so->btso_curbuf = InvalidBuffer;
ItemPointerSetInvalid(iptr);
}
if (ItemPointerIsValid(iptr = &(scan->currentMarkData)))
{
if (BufferIsValid(so->btso_mrkbuf))
- _bt_relbuf(scan->relation, so->btso_mrkbuf, BT_READ);
+ ReleaseBuffer(so->btso_mrkbuf);
so->btso_mrkbuf = InvalidBuffer;
ItemPointerSetInvalid(iptr);
}
so = (BTScanOpaque) scan->opaque;
- /* release lock on old marked data, if any */
+ /* we don't hold any read locks */
if (ItemPointerIsValid(iptr = &(scan->currentMarkData)))
{
- _bt_relbuf(scan->relation, so->btso_mrkbuf, BT_READ);
+ ReleaseBuffer(so->btso_mrkbuf);
so->btso_mrkbuf = InvalidBuffer;
ItemPointerSetInvalid(iptr);
}
- /* bump lock on currentItemData and copy to currentMarkData */
+ /* bump pin on current buffer */
if (ItemPointerIsValid(&(scan->currentItemData)))
{
- so->btso_mrkbuf = _bt_getbuf(scan->relation,
- BufferGetBlockNumber(so->btso_curbuf),
- BT_READ);
+ so->btso_mrkbuf = ReadBuffer(scan->relation,
+ BufferGetBlockNumber(so->btso_curbuf));
scan->currentMarkData = scan->currentItemData;
so->mrkHeapIptr = so->curHeapIptr;
}
so = (BTScanOpaque) scan->opaque;
- /* release lock on current data, if any */
+ /* we don't hold any read locks */
if (ItemPointerIsValid(iptr = &(scan->currentItemData)))
{
- _bt_relbuf(scan->relation, so->btso_curbuf, BT_READ);
+ ReleaseBuffer(so->btso_curbuf);
so->btso_curbuf = InvalidBuffer;
ItemPointerSetInvalid(iptr);
}
- /* bump lock on currentMarkData and copy to currentItemData */
+ /* bump pin on marked buffer */
if (ItemPointerIsValid(&(scan->currentMarkData)))
{
- so->btso_curbuf = _bt_getbuf(scan->relation,
- BufferGetBlockNumber(so->btso_mrkbuf),
- BT_READ);
+ so->btso_curbuf = ReadBuffer(scan->relation,
+ BufferGetBlockNumber(so->btso_mrkbuf));
scan->currentItemData = scan->currentMarkData;
so->curHeapIptr = so->mrkHeapIptr;
BTItem item;
BlockNumber blkno;
+ LockBuffer(buf, BT_READ);
/*
* We use this as flag when first index tuple on page is deleted but
* we do not move left (this would slowdown vacuum) - so we set
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/Attic/nbtscan.c,v 1.21 1999/05/25 16:07:29 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/Attic/nbtscan.c,v 1.22 1999/05/25 18:20:30 vadim Exp $
*
*
* NOTES
#include
-#include
typedef struct BTScanListData
ItemPointerSetInvalid(&(so->curHeapIptr));
else
{
+ /*
+ * We have to lock buffer before _bt_step
+ * and unlock it after that.
+ */
+ LockBuffer(buf, BT_READ);
_bt_step(scan, &buf, BackwardScanDirection);
so->btso_curbuf = buf;
if (ItemPointerIsValid(current))
PageGetItemId(pg, ItemPointerGetOffsetNumber(current)));
so->curHeapIptr = btitem->bti_itup.t_tid;
+ LockBuffer(buf, BUFFER_LOCK_UNLOCK);
}
}
}
so->btso_curbuf = so->btso_mrkbuf;
so->btso_mrkbuf = buf;
buf = so->btso_curbuf;
+ LockBuffer(buf, BT_READ); /* as above */
_bt_step(scan, &buf, BackwardScanDirection);
PageGetItemId(pg, ItemPointerGetOffsetNumber(current)));
so->mrkHeapIptr = btitem->bti_itup.t_tid;
+ LockBuffer(buf, BUFFER_LOCK_UNLOCK); /* as above */
}
}
}
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.44 1999/05/25 16:07:31 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.45 1999/05/25 18:20:30 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#include
#include
-#include
#include
*
*
* IDENTIFICATION
- * $Id: nbtsort.c,v 1.39 1999/05/25 16:07:34 momjian Exp $
+ * $Id: nbtsort.c,v 1.40 1999/05/25 18:20:31 vadim Exp $
*
* NOTES
*
#include "postgres.h"
#include "access/nbtree.h"
-#include "storage/bufmgr.h"
#include "storage/bufpage.h"
#include "utils/memutils.h"
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtutils.c,v 1.26 1999/04/13 17:18:29 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtutils.c,v 1.27 1999/05/25 18:20:31 vadim Exp $
*
*-------------------------------------------------------------------------
*/
btitem = (BTItem) palloc(nbytes_btitem);
memmove((char *) &(btitem->bti_itup), (char *) itup, tuplen);
-#ifndef BTREE_VERSION_1
- btitem->bti_oid = newoid();
-#endif
return btitem;
}
projects / postgresql.git / commitdiff