LOCK replication safe?

[Brad Proctor]

We have master-slave replication using MyISAM tables. I'm wondering if a LOCK will block a SELECT on a slave.

I have a situation where only one can be active at any given time.

LOCK TABLE tbl WRITE;
UPDATE tbl SET status = 0 WHERE loc = 'A';
<---- (from slave) SELECT * FROM tbl WHERE loc = 'A' AND status = 1;
INSERT tbl (loc, status) VALUES ('A', 1);
UNLOCK TABLES;

This would normally block the SELECT until after the table was unlocked, but will this work if the SELECT is coming from a slave?

If not, is there another way to do this?

Thanks,
Brad