Posted by sven.holcombe on 09/21/06 02:44

Hi there,

I'm trying to just prevent multiple instances of a script running.

I would have thought that the following code would do this for me.

<php
$fp = fopen("foo.txt", "w");
flock($fp, LOCK_EX + LOCK_NB) or die ("Could not get lock!\n");
echo "Got lock!\n";
sleep(10);
flock($fp, LOCK_UN);
?>

The first script to run would obtain the lock on the file, and would
execute.
Any other scripts would fail immediately (because of my non-blocking
LOCK_NB).

But it seems that ALL of my scripts just wait, and ALL of them end up
printing "Got lock!"

Can anyone help me out?

I am on winXP with php5.

Cheers,
Sven.

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