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Invent ResourceOwner mechanism as per my recent proposal, and use it to

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keep track of portal-related resources separately from transaction-related
resources.  This allows cursors to work in a somewhat sane fashion with
nested transactions.  For now, cursor behavior is non-subtransactional,
that is a cursor's state does not roll back if you abort a subtransaction
that fetched from the cursor.  We might want to change that later.
This commit is contained in:
Tom Lane
2004-07-17 03:32:14 +00:00
parent f4c069ca8f
commit fe548629c5
41 changed files with 2086 additions and 1192 deletions
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30
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 1.83 2004/07/01 00:51:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.84 2004/07/17 03:31:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -92,31 +92,6 @@ extern int32 *LocalRefCount;
) \
)
/*
* IncrBufferRefCount
* Increment the pin count on a buffer that we have *already* pinned
* at least once.
*
* This macro cannot be used on a buffer we do not have pinned,
* because it doesn't change the shared buffer state. Therefore the
* Assert checks are for refcount > 0. Someone got this wrong once...
*/
#define IncrBufferRefCount(buffer) \
( \
BufferIsLocal(buffer) ? \
( \
(void) AssertMacro((buffer) >= -NLocBuffer), \
(void) AssertMacro(LocalRefCount[-(buffer) - 1] > 0), \
(void) LocalRefCount[-(buffer) - 1]++ \
) \
: \
( \
(void) AssertMacro(!BAD_BUFFER_ID(buffer)), \
(void) AssertMacro(PrivateRefCount[(buffer) - 1] > 0), \
(void) PrivateRefCount[(buffer) - 1]++ \
) \
)
/*
* BufferGetBlock
* Returns a reference to a disk page image associated with a buffer.
@@ -138,6 +113,7 @@ extern int32 *LocalRefCount;
*/
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
extern void ReleaseBuffer(Buffer buffer);
extern void IncrBufferRefCount(Buffer buffer);
extern void WriteBuffer(Buffer buffer);
extern void WriteNoReleaseBuffer(Buffer buffer);
extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
@@ -148,8 +124,6 @@ extern void InitBufferPoolAccess(void);
extern char *ShowBufferUsage(void);
extern void ResetBufferUsage(void);
extern void AtEOXact_Buffers(bool isCommit);
extern void AtSubStart_Buffers(void);
extern void AtEOSubXact_Buffers(bool isCommit);
extern void FlushBufferPool(void);
extern BlockNumber BufferGetBlockNumber(Buffer buffer);
extern BlockNumber RelationGetNumberOfBlocks(Relation relation);