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体验新版 GitCode,发现更多精彩内容 >>
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5fb82eb4
编写于
9月 22, 1997
作者:
V
Vadim B. Mikheev
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差异文件
Blowaway relation buffers from buffer pool before truncation:
+ BlowawayRelationBuffers(relation, blocknumber)
上级
708f67c7
变更
1
隐藏空白更改
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并排
Showing
1 changed file
with
65 addition
and
1 deletion
+65
-1
src/backend/storage/buffer/bufmgr.c
src/backend/storage/buffer/bufmgr.c
+65
-1
未找到文件。
src/backend/storage/buffer/bufmgr.c
浏览文件 @
5fb82eb4
...
...
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.2
5 1997/09/18 20:21:21 momjian
Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.2
6 1997/09/22 07:13:56 vadim
Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -99,6 +99,9 @@ static int FlushBuffer(Buffer buffer, bool release);
static
void
BufferSync
(
void
);
static
int
BufferReplace
(
BufferDesc
*
bufHdr
,
bool
bufferLockHeld
);
/* not static but used by vacuum only ... */
int
BlowawayRelationBuffers
(
Relation
rdesc
,
BlockNumber
block
);
/* ---------------------------------------------------
* RelationGetBufferWithBuffer
* see if the given buffer is what we want
...
...
@@ -1603,6 +1606,67 @@ BufferPoolBlowaway()
#endif
/* ---------------------------------------------------------------------
* BlowawayRelationBuffers
*
* This function blowaway all the pages with blocknumber >= passed
* of a relation in the buffer pool. Used by vacuum before truncation...
*
* Returns: 0 - Ok, -1 - DIRTY, -2 - PINNED
*
* XXX currently it sequentially searches the buffer pool, should be
* changed to more clever ways of searching.
* --------------------------------------------------------------------
*/
int
BlowawayRelationBuffers
(
Relation
rdesc
,
BlockNumber
block
)
{
register
int
i
;
BufferDesc
*
buf
;
if
(
rdesc
->
rd_islocal
)
{
for
(
i
=
0
;
i
<
NLocBuffer
;
i
++
)
{
buf
=
&
LocalBufferDescriptors
[
i
];
if
(
buf
->
tag
.
relId
.
relId
==
rdesc
->
rd_id
&&
buf
->
tag
.
blockNum
>=
block
)
{
if
(
buf
->
flags
&
BM_DIRTY
)
return
(
-
1
);
if
(
LocalRefCount
[
i
]
>
0
)
return
(
-
2
);
buf
->
tag
.
relId
.
relId
=
InvalidOid
;
}
}
return
(
0
);
}
SpinAcquire
(
BufMgrLock
);
for
(
i
=
0
;
i
<
NBuffers
;
i
++
)
{
buf
=
&
BufferDescriptors
[
i
];
if
(
buf
->
tag
.
relId
.
dbId
==
MyDatabaseId
&&
buf
->
tag
.
relId
.
relId
==
rdesc
->
rd_id
&&
buf
->
tag
.
blockNum
>=
block
)
{
if
(
buf
->
flags
&
BM_DIRTY
)
{
SpinRelease
(
BufMgrLock
);
return
(
-
1
);
}
if
(
!
(
buf
->
flags
&
BM_FREE
))
{
SpinRelease
(
BufMgrLock
);
return
(
-
2
);
}
BufTableDelete
(
buf
);
}
}
SpinRelease
(
BufMgrLock
);
return
(
0
);
}
#undef IncrBufferRefCount
#undef ReleaseBuffer
...
...
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