Re: Event loop processing in threads that must block

[Luciano Chavez <lnx1138 us ibm com>]

On Thu, 2001-11-15 at 11:33, Havoc Pennington wrote:
> Luciano Chavez <lnx1138 us ibm com> writes: 
> > I apologize for the lack of clarity. Maybe I should ask simply, can I
> > execute gtk_main () on two separate threads or can there only be one
> > thread executing the gtk_main () event loop? I am not talking about
> > nested gtk_main () calls but independent threads calling gtk_main
> > (). 
>
> Ah, no, you can't do that in GTK 1.2 I don't think. GTK 2.0 gives you
> more flexibility (using the GLib-level main loop API).
>  
> A typical trick is to somehow get your UI action to happen in the main
> thread, e.g. by queuing an idle function. Then you could block the
> other thread (pthread_cond_wait?) and wake it up when gtk_main()
> returns in the main thread.

Understood. That just sounds wacky enough to work. :-)

I'll give it a try when I get back to work on the messaging callback
code.

> > Also, can you nest gdk_thread_enter/leave calls? Do they keep reference
> > counts so that the last leave does releases the gdk mutex?
>
> No, they aren't recursive.

Bummer. Coming from OS/2 development this sort of thing is taken for
granted. I'll be careful then using them.

> Havoc

Thanks for the advice.

-- 
regards,

Luciano Chavez

lnx1138 us ibm com          
http://sf.net/projects/evms