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Revert changes to CREATE TRIGGER and ALTER TABLE ADD FOREIGN KEY locking,

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per request from Tom.
This commit is contained in:
Neil Conway
2005-03-24 00:03:26 +00:00
parent 8abba63859
commit 50ce8ab9fc
3 changed files with 13 additions and 21 deletions
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14
src/backend/commands/tablecmds.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.149 2005/03/23 07:44:57 neilc Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.150 2005/03/24 00:03:22 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@@ -3829,13 +3829,13 @@ ATAddForeignKeyConstraint(AlteredTableInfo *tab, Relation rel,
Oid constrOid;
/*
* Grab a lock on the pk table, so that someone doesn't delete
* rows out from under us. We will eventually need to add triggers
* to the table, at which point we'll need to an ExclusiveLock --
* therefore we grab an ExclusiveLock now to prevent possible
* deadlock.
* Grab an exclusive lock on the pk table, so that someone doesn't
* delete rows out from under us. (Although a lesser lock would do for
* that purpose, we'll need exclusive lock anyway to add triggers to
* the pk table; trying to start with a lesser lock will just create a
* risk of deadlock.)
*/
pkrel = heap_openrv(fkconstraint->pktable, ExclusiveLock);
pkrel = heap_openrv(fkconstraint->pktable, AccessExclusiveLock);
/*
* Validity and permissions checks