CREATE TABLE t1 (c1 INT , c2 CHAR(10), PRIMARY KEY (c1)) ENGINE = InnoDB;
INSERT INTO t1 VALUES(0, "0");
INSERT INTO t1 VALUES(1, "1");
INSERT INTO t1 VALUES(2, "2");
INSERT INTO t1 VALUES(3, "3");
connect  con1,localhost,root,,;
connect  con2,localhost,root,,;
connect  con3,localhost,root,,;
connect  con4,localhost,root,,;
connect  con5,localhost,root,,;
connect  con6,localhost,root,,;
connection default;
SET AUTOCOMMIT=0;
BEGIN;
SELECT * FROM t1 FOR UPDATE;
c1	c2
0	0
1	1
2	2
3	3
SELECT * FROM t1 WHERE c1 <= 3;
c1	c2
0	0
1	1
2	2
3	3
connection default;
SET DEBUG_SYNC='now WAIT_FOR waiting4';
SET DEBUG_SYNC= 'RESET';
SELECT trx_state, trx_query, trx_autocommit_non_locking
FROM INFORMATION_SCHEMA.INNODB_TRX
WHERE trx_state = 'LOCK WAIT'
ORDER BY trx_query;
trx_state	trx_query	trx_autocommit_non_locking
LOCK WAIT	SELECT COUNT(*) FROM t1 LOCK IN SHARE MODE	0
LOCK WAIT	SELECT COUNT(*) FROM t1 WHERE c1 >= 0	0
INSERT INTO t1 VALUES(4, '4');
COMMIT;
connection con6;
SELECT * FROM t1 WHERE c1 <= 4;
c1	c2
0	0
1	1
2	2
3	3
XA END '1';
XA PREPARE '1';
XA ROLLBACK '1';
disconnect con6;
disconnect con2;
disconnect con3;
disconnect con5;
connection con1;
COUNT(*)
5
disconnect con1;
connection con4;
COUNT(*)
5
disconnect con4;
connection default;
DROP TABLE t1;