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Posted by Jim Moseby on 08/02/05 18:28
> -----Original Message-----
> From: Matt [mailto:datahead4@gmail.com]
> Sent: Tuesday, August 02, 2005 10:45 AM
> To: php-general@lists.php.net
> Subject: Re: [PHP] How to determine if a script instance is already
> running?
>
>
> Perhaps "svscan" and its associated "daemontools" programs could be
> used to monitor the script instead of relying on cron.
>
> http://cr.yp.to/daemontools.html
>
> On 8/2/05, André Medeiros <andre.caum@gmail.com> wrote:
> > On Tue, 2005-08-02 at 15:09 +0100, Stut wrote:
> > > André Medeiros wrote:
> > > > 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 :)
> > >
> > > Personally I'd extend that slightly to have the process
> touch the PID
> > > file every so often and to check that it's been touched
> recently when it
> > > starts up. Alternatively use the ps shell command to check that a
> > > process with that PID is still running, but that tends to
> be less reliable.
> > >
> > > If the process does decide to continue in spite of the
> PID file existing
> > > it should issue a a shell kill command to kill that PID
> in case it's
> > > hung or a zombie.
> > >
> > > -Stut
> >
> > Excelent point!
Thanks to all who replied. I'll let the list know how it works out.
JM
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