Re: How to determine if a script instance is already running?
| From: | André Medeiros | Date: | Tue, 02 Aug 2005 14:59:30 +0000 |
| Subject: | Re: How to determine if a script instance is already running? | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-219822@lists.php.net to get a copy of this message | ||
On Tue, 2005-08-02 at 09:49 -0400, Jim Moseby wrote:
> I have a command line script that needs to run continuously, and so I plan
> to have cron execute it every so often. I want to have the script first
> check to see if another instance is already running and, if so, die().
>
> Now, I know I can exec the process list and parse through the output, but is
> there and easier, faster, cooler, sexier, better way? :o)
>
> JM
>
Do like some services do:
1) Check if script.pid exists
2) If it doesn't
2.1) Write the process's PID onto the file
(http://pt.php.net/manual/en/function.getmypid.php)
3) If it does
3.1) Die gracefully :)