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Repair two related errors in heap_lock_tuple: it was failing to recognize

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cases where we already hold the desired lock "indirectly", either via
membership in a MultiXact or because the lock was originally taken by a
different subtransaction of the current transaction.  These cases must be
accounted for to avoid needless deadlocks and/or inappropriate replacement of
an exclusive lock with a shared lock.  Per report from Clarence Gardner and
subsequent investigation.
This commit is contained in:
Tom Lane
2006-11-17 18:00:15 +00:00
parent b6b5aa102b
commit 4f335a3d7f
4 changed files with 115 additions and 46 deletions
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3
src/include/access/multixact.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/multixact.h,v 1.10 2006/03/24 04:32:13 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/multixact.h,v 1.11 2006/11/17 18:00:15 tgl Exp $
*/
#ifndef MULTIXACT_H
#define MULTIXACT_H
@@ -45,6 +45,7 @@ typedef struct xl_multixact_create
extern MultiXactId MultiXactIdCreate(TransactionId xid1, TransactionId xid2);
extern MultiXactId MultiXactIdExpand(MultiXactId multi, TransactionId xid);
extern bool MultiXactIdIsRunning(MultiXactId multi);
extern bool MultiXactIdIsCurrent(MultiXactId multi);
extern void MultiXactIdWait(MultiXactId multi);
extern bool ConditionalMultiXactIdWait(MultiXactId multi);
extern void MultiXactIdSetOldestMember(void);