###############session 1###############
MySQL [test]> create table t1(seat_id int, state int, primary key(seat_id)) engine=innodb;
Query OK, 0 rows affected (0.03 sec)

MySQL [test]> INSERT INTO t1 VALUES(1,0), (2,0), (3,0), (4,0);
Query OK, 4 rows affected (0.01 sec)
Records: 4  Duplicates: 0  Warnings: 0

MySQL [test]> begin;
Query OK, 0 rows affected (0.01 sec)

MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR SHARE;
+---------+-------+
| seat_id | state |
+---------+-------+
|       1 |     0 |
|       2 |     0 |
+---------+-------+
2 rows in set (0.00 sec)

###############session 2###############
MySQL [test]> SET SESSION innodb_lock_wait_timeout=1;
Query OK, 0 rows affected (0.00 sec)
MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE;
ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE NOWAIT;
ERROR 5010 (HY000): Do not wait for lock.
MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE SKIP LOCKED;
+---------+-------+
| seat_id | state |
+---------+-------+
|       3 |     0 |
|       4 |     0 |
+---------+-------+
2 rows in set (0.00 sec)

MySQL [test]> SELECT * FROM t1 WHERE seat_id > 0 LIMIT 2 FOR UPDATE NOWAIT;
ERROR 5010 (HY000): Do not wait for lock.
MySQL [test]> SELECT * FROM t1 WHERE seat_id > 0 LIMIT 2 FOR UPDATE SKIP LOCKED;
+---------+-------+
| seat_id | state |
+---------+-------+
|       3 |     0 |
|       4 |     0 |
+---------+-------+
2 rows in set (0.00 sec)

MySQL [test]> commit;
Query OK, 0 rows affected (0.00 sec)

###############session 1###############
MySQL [test]> begin;
Query OK, 0 rows affected (0.01 sec)

MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE;
+---------+-------+
| seat_id | state |
+---------+-------+
|       1 |     0 |
|       2 |     0 |
+---------+-------+
2 rows in set (0.00 sec)

###############session 2###############
MySQL [test]> SET SESSION innodb_lock_wait_timeout=1;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> begin;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE;
ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR SHARE;
ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR SHARE NOWAIT;
ERROR 5010 (HY000): Do not wait for lock.
MySQL [test]> SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR SHARE SKIP LOCKED;
+---------+-------+
| seat_id | state |
+---------+-------+
|       3 |     0 |
|       4 |     0 |
+---------+-------+
2 rows in set (0.00 sec)

MySQL [test]> commit;
Query OK, 0 rows affected (0.00 sec)

ALTER TABLE `table` [NO_WAIT | WAIT [n]] `command`;
DROP TABLE `table` [NO_WAIT | WAIT [n]];
TRUNCATE TABLE `table` [NO_WAIT | WAIT [n]];
OPTIMIZE TABLE `table` [NO_WAIT | WAIT [n]];
RENAME TABLE `table_src` [NO_WAIT | WAIT [n]] TO `table_dst`;
CREATE INDEX `index` ON `table.columns` [NO_WAIT | WAIT [n]];
CREATE FULLTEXT INDEX `index` ON `table.columns` [NO_WAIT | WAIT [n]];
CREATE SPATIAL INDEX `index` ON `table.columns` [NO_WAIT | WAIT [n]];
DROP INDEX `index` ON `table` [NO_WAIT | WAIT [n]];