On Jul 29, 7:14 am, Piet van Oostrum <p...@cs.uu.nl> wrote: > >>>>> Carl Banks <pavlovevide...@gmail.com> (CB) wrote: > >CB> On Jul 28, 3:15 pm, John D Giotta <jdgio...@gmail.com> wrote: > >>> I'm looking to run a process with a limit of 3 instances, but each > >>> execution is over a crontab interval. I've been investigating the > >>> threading module and using daemons to limit active thread objects, but > >>> I'm not very successful at grasping the documentation. > > >>> Is it possible to do what I'm trying to do and if so anyone know of a > >>> useful example to get started? > >CB> It seems like you want to limit the number of processes to three; the > >CB> threading module won't help you there because it deals with threads > >CB> within a single process. > >CB> What I'd do is to simply run the system ps to see how many processes > >CB> are running (ps is pretty versatile on most systems and can find > >CB> specifically targeted processes like you program), and exit if there > >CB> are already three. > > That will surely run into some race conditions.
What, the OS might not have gotten around to update the process table to include a process started minutes ago? (He said he was starting the processes over crontab intervals, not that he communicated what he wanted well.) Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
