IS_USED_LOCK(str): Checks whether the lock named str is in use (that is, locked). : IS_USED_LOCK « Miscellaneous Functions « MySQL Tutorial






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If so, it returns the connection identifier of the client that holds the lock. Otherwise, it returns NULL.

22.7.IS_USED_LOCK
22.7.1.IS_USED_LOCK(str): Checks whether the lock named str is in use (that is, locked).