DROP TABLE IF EXISTS t1;
# Verifying that X_LOCK not acquired
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
SET autocommit=0;
SET innodb_fake_changes=1;
BEGIN;
SELECT * FROM t1 FOR UPDATE;
a
1
SET innodb_lock_wait_timeout=3;
UPDATE t1 SET a=2;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
SELECT * FROM t1 LOCK IN SHARE MODE;
a
1
ROLLBACK;
SET innodb_fake_changes=default;
DROP TABLE t1;