Re: spawn functions?

[Sergei Steshenko <sergstesh yahoo com>]

--- On Thu, 4/12/12, haratron <haratron gmail com> wrote:

> From: haratron <haratron gmail com>
> Subject: spawn functions?
> To: gtk-perl-list gnome org
> Date: Thursday, April 12, 2012, 11:46 AM
> Hello,
>
> it seems that the spawn* functions of Gtk have not been
> ported to gtk2-perl.
> I have this problem where I need to launch an external
> process from a
> button's click callback. It's a TTS (text to speech)
> application that
> has play, pause and stop buttons. The actual speech is been
> done by a
> python script that I need to execute (don't ask..). The GUI
> in
> gtk-perl shouldn't block, so that I am able to e.g. press
> pause/stop
> while the voice speaks. I've tried a lot of ways but it
> always ends up
> to one of the following:
> - GUI gets blocked and I can't press pause/stop buttons
> - GUI doesn't block (usually when I'm forking from within
> the
> callback) but once the python script is done speaking, the
> gtk-perl
> GUI is closed as well. I read this is a problem of gtk and
> there are
> the spawn* functions to compensate for that.
>
> How can I do this?
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> gtk-perl-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-perl-list

I do this using shared memory.

My gtk+ Perl script sets a flag in shared memory that new data is available (after making it available) and 
the consumer process monitors the flag and grabs the new data when it sees the set flag.

There is also an acknowledge mechanism, i.e. the IPC is bidirectional.

Regards,
  Sergei.