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MYSQL

GET_LOCK()


Description

The GET_LOCK( ) function returns 1 if the lock is obtained successfully, 0 if the attempt is timed out, and NULL if any other error occurred.

This function has the form:

SELECT GET_LOCK(str)
Parameter Description
str A string

Return Value

Returns 1 if the lock is obtained successfully, 0 if the attempt is timed out, and NULL if any other error occurred.

Examples

The following example shows the basic use of this function:

mysql> SELECT GET_LOCK('lock1',10);
-> 1
mysql> SELECT IS_FREE_LOCK('lock2');
-> 1
mysql> SELECT GET_LOCK('lock2',10);
-> 1
mysql> SELECT RELEASE_LOCK('lock2');
-> 1
mysql> SELECT RELEASE_LOCK('lock1');
-> NULL


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