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Further work on connecting the free space map (which is still just a

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stub) into the rest of the system.  Adopt a cleaner approach to preventing
deadlock in concurrent heap_updates: allow RelationGetBufferForTuple to
select any page of the rel, and put the onus on it to lock both buffers
in a consistent order.  Remove no-longer-needed isExtend hack from
API of ReleaseAndReadBuffer.
This commit is contained in:
Tom Lane
2001-06-29 21:08:25 +00:00
parent 0eab92c0e6
commit af5ced9cfd
12 changed files with 381 additions and 233 deletions
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6
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: bufmgr.h,v 1.52 2001/06/09 18:16:59 tgl Exp $
* $Id: bufmgr.h,v 1.53 2001/06/29 21:08:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -155,10 +155,11 @@ extern long *LocalRefCount;
* prototypes for functions in bufmgr.c
*/
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
extern int ReleaseBuffer(Buffer buffer);
extern int WriteBuffer(Buffer buffer);
extern int WriteNoReleaseBuffer(Buffer buffer);
extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
BlockNumber blockNum, bool isExtend);
BlockNumber blockNum);
extern int FlushBuffer(Buffer buffer, bool sync, bool release);
extern void InitBufferPool(void);
@@ -176,7 +177,6 @@ extern void DropRelFileNodeBuffers(RelFileNode rnode);
extern void DropBuffers(Oid dbid);
extern void PrintPinnedBufs(void);
extern int BufferShmemSize(void);
extern int ReleaseBuffer(Buffer buffer);
extern RelFileNode BufferGetFileNode(Buffer buffer);
extern void SetBufferCommitInfoNeedsSave(Buffer buffer);