try to get multiple locks in mysql

gistfile1.txt

mysql> select get_lock('foo', 1200);
+-----------------------+
| get_lock('foo', 1200) |
+-----------------------+
|                     1 |
+-----------------------+
1 row in set (0.00 sec)

mysql> select get_lock('bar', 1200);
+-----------------------+
| get_lock('bar', 1200) |
+-----------------------+
|                     1 |
+-----------------------+
1 row in set (0.00 sec)

mysql> select release_lock('foo');
+---------------------+
| release_lock('foo') |
+---------------------+
|                NULL |
+---------------------+
1 row in set (0.00 sec)