[PD] patch runs twice from script
Csaba Láng
langcsaba at gmail.com
Wed Aug 26 11:14:49 CEST 2015
Thanks Iohannes,
will give a try, but anyway it already happened not the first time to me.
Last time I had 3 identical mac minis with the same system image on each. 2
could run the script without problem, but the 3rd did not. The problem is
especially with GEM, as in this case I have double lights turned on and
everything is too bright.
Anyway, this should work automatically as the installation is permanent in
a museum.
Will get back to you soon.
Popesz
On Tue, Aug 25, 2015 at 11:00 PM, IOhannes m zmölnig <zmoelnig at iem.at>
wrote:
> On 08/25/2015 10:53 PM, Csaba Láng wrote:
> > Dear list,
> > is there a way to avoid that a patch which is run from a script either
> from
> > crontab or just autorun from the system runs twice?
> > I heard about --no-gui solution, but never managed to use it on Mac.
>
> i don't know how "--no-gui" is supposed to help you here.
> it only might obfuscate the fact that two instances are running...
>
>
> i can think of two simple ways to avoid double runs:
> - setup a shared-ressource (a lock-file): when the script starts it
> checks for the lock-file; if it is not there, it will create the lock,
> launch Pd; once Pd is finished it will remove the lock;
> if the lock *is* there, the script will exit immediately.
> see flock(1) on linux and shlock(1) on osx.
>
> - stop all running instances of the patch before starting it.
> usually you would just do something along the lines of `pkill -KILL pd`,
> before starting a new instance of Pd.
>
> fmasdr
> IOhannes
>
>
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