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Improve lock level choices in pg_shdepend.c. Noticed by Tom Lane.

This commit is contained in:
Alvaro Herrera 2008-01-23 15:36:38 +00:00
parent 6a7a63d3a3
commit 8984c8bbe2
1 changed files with 15 additions and 5 deletions
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20
src/backend/catalog/pg_shdepend.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/pg_shdepend.c,v 1.22 2008/01/01 19:45:48 momjian Exp $
* $PostgreSQL: pgsql/src/backend/catalog/pg_shdepend.c,v 1.23 2008/01/23 15:36:38 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@ -1110,7 +1110,12 @@ shdepDropOwned(List *roleids, DropBehavior behavior)
deleteobjs = new_object_addresses();
sdepRel = heap_open(SharedDependRelationId, AccessExclusiveLock);
/*
* We don't need this strong a lock here, but we'll call routines that
* acquire RowExclusiveLock. Better get that right now to avoid potential
* deadlock failures.
*/
sdepRel = heap_open(SharedDependRelationId, RowExclusiveLock);
/*
* For each role, find the dependent objects and drop them using the
@ -1224,7 +1229,7 @@ shdepDropOwned(List *roleids, DropBehavior behavior)
/* the dependency mechanism does the actual work */
performMultipleDeletions(deleteobjs, behavior);
heap_close(sdepRel, AccessExclusiveLock);
heap_close(sdepRel, RowExclusiveLock);
free_object_addresses(deleteobjs);
}
@ -1241,7 +1246,12 @@ shdepReassignOwned(List *roleids, Oid newrole)
Relation sdepRel;
ListCell *cell;
sdepRel = heap_open(SharedDependRelationId, AccessShareLock);
/*
* We don't need this strong a lock here, but we'll call routines that
* acquire RowExclusiveLock. Better get that right now to avoid potential
* deadlock problems.
*/
sdepRel = heap_open(SharedDependRelationId, RowExclusiveLock);
foreach(cell, roleids)
{
@ -1343,5 +1353,5 @@ shdepReassignOwned(List *roleids, Oid newrole)
systable_endscan(scan);
}
heap_close(sdepRel, AccessShareLock);
heap_close(sdepRel, RowExclusiveLock);
}