MySQL query execution timeout (no replies)

Hi all,

I'm a PHP-MySQL developer, I would like to stop the MySQL query execution when it breaks a time limit, for example 10 seconds. I've seen a lot of system MySQL variables (http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html) but the only timeout variables I've read are:

connect_timeout
interactive_timeout
net_read_timeout
net_write_timeout
slave-net-timeout
wait_timeout


And I think the preceding ones doesn't satisfy my goal.
Any suggestion?

Thanks in advance