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Another round of code cleanup on bufmgr. Use BM_VALID flag to keep track

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of whether we have successfully read data into a buffer; this makes the
error behavior a bit more transparent (IMHO anyway), and also makes it
work correctly for local buffers which don't use Start/TerminateBufferIO.
Collapse three separate functions for writing a shared buffer into one.
This overlaps a bit with cleanups that Neil proposed awhile back, but
seems not to have committed yet.
This commit is contained in:
Tom Lane
2004-04-21 18:06:30 +00:00
parent aeee856564
commit 95a03e9cdf
6 changed files with 331 additions and 431 deletions
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6
src/backend/storage/buffer/buf_init.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.63 2004/04/19 23:27:17 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.64 2004/04/21 18:06:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -133,11 +133,11 @@ InitBufferPool(void)
buf->bufNext = i + 1;
CLEAR_BUFFERTAG(&(buf->tag));
CLEAR_BUFFERTAG(buf->tag);
buf->buf_id = i;
buf->data = MAKE_OFFSET(block);
buf->flags = (BM_DELETED | BM_VALID);
buf->flags = 0;
buf->refcount = 0;
buf->io_in_progress_lock = LWLockAssign();
buf->cntx_lock = LWLockAssign();