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redo/undo support functions and cleanups.

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This commit is contained in:
Vadim B. Mikheev
2000-10-20 11:01:21 +00:00
parent e18a862d46
commit b58c0411ba
15 changed files with 726 additions and 167 deletions
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55
src/backend/storage/buffer/bufmgr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.87 2000/10/18 05:50:15 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.88 2000/10/20 11:01:07 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -2481,3 +2481,56 @@ AbortBufferIO(void)
SpinRelease(BufMgrLock);
}
}
/*
* Cleanup buffer or mark it for cleanup. Buffer may be cleaned
* up if it's pinned only once.
*
* NOTE: buffer must be excl locked.
*/
void
MarkBufferForCleanup(Buffer buffer, void (*CleanupFunc)(Buffer))
{
BufferDesc *bufHdr = &BufferDescriptors[buffer - 1];
Assert(PrivateRefCount[buffer - 1] > 0);
if (PrivateRefCount[buffer - 1] > 1)
{
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
PrivateRefCount[buffer - 1]--;
SpinAcquire(BufMgrLock);
Assert(bufHdr->refcount > 0);
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
bufHdr->CleanupFunc = CleanupFunc;
SpinRelease(BufMgrLock);
return;
}
SpinAcquire(BufMgrLock);
Assert(bufHdr->refcount > 0);
if (bufHdr->refcount == 1)
{
SpinRelease(BufMgrLock);
CleanupFunc(buffer);
CleanupFunc = NULL;
}
else
SpinRelease(BufMgrLock);
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
PrivateRefCount[buffer - 1]--;
SpinAcquire(BufMgrLock);
Assert(bufHdr->refcount > 0);
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
bufHdr->CleanupFunc = CleanupFunc;
bufHdr->refcount--;
if (bufHdr->refcount == 0)
{
AddBufferToFreelist(bufHdr);
bufHdr->flags |= BM_FREE;
}
SpinRelease(BufMgrLock);
return;
}