"Jay Blanchard" <jay.blanchard@xxxxxxxxxxxxxxxxxxxxx> writes: > [snip] > I have a script that inserts data from files uploaded to our server. I > need > to make sure that only one instance of this script runs at anyone time, > can > anyone tell me how I can do this? > [/snip] > > Don't run another instance. ba-dump ching! > > Ok, here is a quick and dirty way to do it, have the script check for > the existence of a file containing a date and timestamp, if one does not > exist the script creates one. If it does exist, the script exits. Once > the script is nearing completion have it destroy the file (unlink). Unluckily, this will not prevent a race condition. The only file operations that are guaranteed to be atomic are mkdir() and symlink(). Try to create the directory and see if it fails. Also remember to rmdir() the lock directory before exiting -- Raj Shekhar Y! : Operations Engineer MySQL DBA, programmer and slacker Y!IM : lunatech3007 home : http://rajshekhar.net blog : http://rajshekhar.net/blog/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
