diff options
Diffstat (limited to 'src/backend/storage/lmgr/lmgr.c')
| -rw-r--r-- | src/backend/storage/lmgr/lmgr.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/backend/storage/lmgr/lmgr.c b/src/backend/storage/lmgr/lmgr.c index dc0a4396388..3f57507bce8 100644 --- a/src/backend/storage/lmgr/lmgr.c +++ b/src/backend/storage/lmgr/lmgr.c @@ -288,6 +288,51 @@ UnlockRelation(Relation relation, LOCKMODE lockmode) } /* + * CheckRelationLockedByMe + * + * Returns true if current transaction holds a lock on 'relation' of mode + * 'lockmode'. If 'orstronger' is true, a stronger lockmode is also OK. + * ("Stronger" is defined as "numerically higher", which is a bit + * semantically dubious but is OK for the purposes we use this for.) + */ +bool +CheckRelationLockedByMe(Relation relation, LOCKMODE lockmode, bool orstronger) +{ + LOCKTAG tag; + + SET_LOCKTAG_RELATION(tag, + relation->rd_lockInfo.lockRelId.dbId, + relation->rd_lockInfo.lockRelId.relId); + + if (LockHeldByMe(&tag, lockmode)) + return true; + + if (orstronger) + { + LOCKMODE slockmode; + + for (slockmode = lockmode + 1; + slockmode <= MaxLockMode; + slockmode++) + { + if (LockHeldByMe(&tag, slockmode)) + { +#ifdef NOT_USED + /* Sometimes this might be useful for debugging purposes */ + elog(WARNING, "lock mode %s substituted for %s on relation %s", + GetLockmodeName(tag.locktag_lockmethodid, slockmode), + GetLockmodeName(tag.locktag_lockmethodid, lockmode), + RelationGetRelationName(relation)); +#endif + return true; + } + } + } + + return false; +} + +/* * LockHasWaitersRelation * * This is a function to check whether someone else is waiting for a |