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CREATE TABLE t1 (c1 INT NOT NULL PRIMARY KEY, c2 INT NOT NULL, c3 INT NOT NULL) ENGINE=InnoDB; INSERT INTO t1 VALUES (0, 0, 0); # On connection 1 START TRANSACTION READ ONLY; SELECT c1, c2 FROM t1 WHERE c1=0 LOCK IN SHARE MODE; c1 c2 0 0 # On connection 2 START TRANSACTION; UPDATE t1 SET c1=2 WHERE c1=0 AND c2=0; # On connection 3 include/start_transaction_high_prio.inc START TRANSACTION /* HIGH PRIORITY */; SET @con2_id = <con2_id>; SET DEBUG_SYNC='rec_lock_add_to_waitq SIGNAL signal1 WAIT_FOR waiting1'; UPDATE t1 SET c1=3 WHERE c1=0;; # On connection 1 SET DEBUG_SYNC='now WAIT_FOR signal1'; SET DEBUG_SYNC='now SIGNAL waiting1'; COMMIT; # On connection 3 COMMIT; # On connection 2 COMMIT; include/assert.inc ['There is a 3.0.0 in t1'] include/assert.inc ['There is no 0.0.0 in t1'] include/assert.inc ['There is no 2 in t1.c1'] DROP TABLE t1;