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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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12
src/include/storage/lock.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/lock.h,v 1.78 2004/07/01 00:51:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/lock.h,v 1.79 2004/07/17 03:31:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -26,14 +26,6 @@ typedef struct PROC_QUEUE
int size; /* number of entries in list */
} PROC_QUEUE;
/* Release options for LockReleaseAll */
typedef enum
{
ReleaseAll, /* All my locks */
ReleaseAllExceptSession, /* All except session locks (Xid = 0) */
ReleaseGivenXids /* Only locks with Xids in given array */
} LockReleaseWhich;
/* struct PGPROC is declared in storage/proc.h, but must forward-reference it */
typedef struct PGPROC PGPROC;
@@ -248,7 +240,7 @@ extern bool LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
extern bool LockRelease(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
TransactionId xid, LOCKMODE lockmode);
extern bool LockReleaseAll(LOCKMETHODID lockmethodid, PGPROC *proc,
LockReleaseWhich which, int nxids, TransactionId *xids);
bool allxids);
extern int LockCheckConflicts(LockMethod lockMethodTable,
LOCKMODE lockmode,
LOCK *lock, PROCLOCK *proclock, PGPROC *proc,