diff options
Diffstat (limited to 'src/backend/storage/lmgr/lock.c')
| -rw-r--r-- | src/backend/storage/lmgr/lock.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c index 84637fe581..2c1c652489 100644 --- a/src/backend/storage/lmgr/lock.c +++ b/src/backend/storage/lmgr/lock.c @@ -539,6 +539,20 @@ ProcLockHashCode(const PROCLOCKTAG *proclocktag, uint32 hashcode) } /* + * Given two lock modes, return whether they would conflict. + */ +bool +DoLockModesConflict(LOCKMODE mode1, LOCKMODE mode2) +{ + LockMethod lockMethodTable = LockMethods[DEFAULT_LOCKMETHOD]; + + if (lockMethodTable->conflictTab[mode1] & LOCKBIT_ON(mode2)) + return true; + + return false; +} + +/* * LockHasWaiters -- look up 'locktag' and check if releasing this * lock would wake up other processes waiting for it. */ @@ -630,7 +644,6 @@ LockHasWaiters(const LOCKTAG *locktag, LOCKMODE lockmode, bool sessionLock) return hasWaiters; } - /* * LockAcquire -- Check for lock conflicts, sleep if conflict found, * set lock if/when no conflicts. |