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Now that we've rearranged relation open to get a lock before touching

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the rel, it's easy to get rid of the narrow race-condition window that
used to exist in VACUUM and CLUSTER.  Did some minor code-beautification
work in the same area, too.
This commit is contained in:
Tom Lane
2006-08-18 16:09:13 +00:00
parent e91600d1c2
commit 7aa772f03e
8 changed files with 153 additions and 91 deletions
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7
src/backend/commands/lockcmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/lockcmds.c,v 1.14 2006/03/05 15:58:24 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/lockcmds.c,v 1.15 2006/08/18 16:09:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -59,7 +59,10 @@ LockTableCommand(LockStmt *lockstmt)
aclcheck_error(aclresult, ACL_KIND_CLASS,
get_rel_name(reloid));
rel = conditional_relation_open(reloid, lockstmt->mode, lockstmt->nowait);
if (lockstmt->nowait)
rel = relation_open_nowait(reloid, lockstmt->mode);
else
rel = relation_open(reloid, lockstmt->mode);
/* Currently, we only allow plain tables to be locked */
if (rel->rd_rel->relkind != RELKIND_RELATION)