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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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4
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.75 2004/02/04 01:24:53 wieck Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.76 2004/04/21 18:06:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -142,7 +142,7 @@ extern long *LocalRefCount;
* prototypes for functions in bufmgr.c
*/
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
extern int ReleaseBuffer(Buffer buffer);
extern void ReleaseBuffer(Buffer buffer);
extern void WriteBuffer(Buffer buffer);
extern void WriteNoReleaseBuffer(Buffer buffer);
extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,