Re: spawn functions?

[Sergei Steshenko <sergstesh yahoo com>]

--- On Fri, 4/13/12, haratron <haratron gmail com> wrote:

> From: haratron <haratron gmail com>
> Subject: Re: spawn functions?
> To: "Sergei Steshenko" <sergstesh yahoo com>
> Cc: gtk-perl-list gnome org
> Date: Friday, April 13, 2012, 9:38 AM
> What do you mean by shared memory?
> Can you give a code example?
>
> On Thu, Apr 12, 2012 at 10:48 PM, Sergei Steshenko <sergstesh yahoo com>
> wrote:
> > --- 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?
> > > _______________________________________________
> > > gtk-perl-list mailing list
> > > 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.

I won't give a code example because it's a proprietery project.

Regarding "What do you mean by shared memory?" - for example, Yahoo web search in response to

Linux shared memory

search terms yields, among others, the following matches:

http://fscked.org/writings/SHM/shm.html
http://en.wikipedia.org/wiki/Shared_memory
http://www.cs.cf.ac.uk/Dave/C/node27.html
.

Try to enter

shared memory

into search.cpan.org .

My routines are actually written in "C" and are linked to my Perl script using "Inline::C" module, but one 
can access shared memory from Perl directly.

Regards,
  Sergei.

P.S. An acquaintance   of mine, a CTO, typically does _not_ ask "what is FOO", he rather asks "what are the 
search terms to to learn about FOO".