only one at atime

Hi everyone,

I create a php script that will run every minute (by cronjob) and
update some database tables (php 5, database mysql 5, tables type
innodb)

the problem is that I want this script to run only one at atime (only
one process from this script can run )

for example, if the cronjob start the script and the script takes more
than one minute, then after this one minute the cronjob start another
process from this script, it should exit once it find there is an old
process of it running)

what I do now is that when the script start it will check for a tmp
file (/tmp/script.pid) and if it fine it it will exit.
if the file (/tmp/script.pid) is not exists, it will create it and
start doing the database update
and when the script finish it will remove the file


any better idea ?

Thanks

--

Ahmad
http://www.v-tadawul.com
.

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