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WriteBuffer return value:

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>I'd vote for changing WriteBuffer to
>return void, and have it elog() on bad argument.

Manfred Koizar
This commit is contained in:
Bruce Momjian
2002-06-15 19:59:59 +00:00
parent 82b14b62ca
commit 6e8a1a6717
5 changed files with 46 additions and 54 deletions
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76
src/backend/storage/buffer/bufmgr.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.124 2002/06/15 19:55:37 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.125 2002/06/15 19:59:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -87,6 +87,7 @@ static int ReleaseBufferWithBufferLock(Buffer buffer);
static int BufferReplace(BufferDesc *bufHdr);
void PrintBufferDescs(void);
static void write_buffer(Buffer buffer, bool unpin);
/*
* ReadBuffer -- returns a buffer containing the requested
@ -557,6 +558,36 @@ BufferAlloc(Relation reln,
return buf;
}
/*
* write_buffer -- common functionality for
* WriteBuffer and WriteNoReleaseBuffer
*/
static void
write_buffer(Buffer buffer, bool release)
{
BufferDesc *bufHdr;
if (BufferIsLocal(buffer))
{
WriteLocalBuffer(buffer, release);
return;
}
if (BAD_BUFFER_ID(buffer))
elog(ERROR, "write_buffer: bad buffer %d", buffer);
bufHdr = &BufferDescriptors[buffer - 1];
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
Assert(bufHdr->refcount > 0);
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
if (release)
UnpinBuffer(bufHdr);
LWLockRelease(BufMgrLock);
}
/*
* WriteBuffer
*
@ -571,55 +602,20 @@ BufferAlloc(Relation reln,
#undef WriteBuffer
int
void
WriteBuffer(Buffer buffer)
{
BufferDesc *bufHdr;
if (BufferIsLocal(buffer))
return WriteLocalBuffer(buffer, TRUE);
if (BAD_BUFFER_ID(buffer))
return FALSE;
bufHdr = &BufferDescriptors[buffer - 1];
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
Assert(bufHdr->refcount > 0);
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
UnpinBuffer(bufHdr);
LWLockRelease(BufMgrLock);
return TRUE;
write_buffer(buffer, true);
}
/*
* WriteNoReleaseBuffer -- like WriteBuffer, but do not unpin the buffer
* when the operation is complete.
*/
int
void
WriteNoReleaseBuffer(Buffer buffer)
{
BufferDesc *bufHdr;
if (BufferIsLocal(buffer))
return WriteLocalBuffer(buffer, FALSE);
if (BAD_BUFFER_ID(buffer))
return STATUS_ERROR;
bufHdr = &BufferDescriptors[buffer - 1];
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
Assert(bufHdr->refcount > 0);
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
LWLockRelease(BufMgrLock);
return STATUS_OK;
write_buffer(buffer, false);
}