Re: Dialog boxes in seperate thread

["David Conley (FRD)" <dconley frd co uk>]

Hmmm thats annoying. In this case the thread needs to pause and wait for 
user input so triggering the dialog in the root thread would allow the 
worker thread to continue without the required user input.
Thanks for your help
Dave

Dave Conley
Programmer
Free Radical Design
http://www.frd.co.uk

On Wed, 30 Apr 2008, jcupitt gmail com wrote:

> 2008/4/30 David Conley (FRD) <dconley frd co uk>:
> > Are modal dialog boxes possible in threads? I have this call in a thread
> >  seperate to the main gtk thread:
> >
> >  gtk_dialog_run(GTK_DIALOG(errorDialog));
> >
> >  and obviously that locks that thread while the main thread continues but
> >  nothing updates the display in the blocked thread and the app becomes
> >  unresponsive.
>
> GTK is happiest if you keep all gtk_* calls in the main thread, and if
> the main thread does (almost) nothing but run the gtk event loop.
>
> If you need to start a thread to do a long running task, don't call
> gtk stuff from the thread, instead send a message to the main thread
> and ask it to make the calls on the thread's behalf. This is easy to
> do with g_idle_add(), which you can call safely from a worker thread.
>
> Something like:
>
> on_button_click( ..
> {
>  if (!app->bg_job)
>    app->bg_job = g_thread_create( background_job ..
> }
>
> background_job ( ..
> {
>  for (int i = 0; i < 100; i++) {
>    char *str = g_strdup_printf ("... still working! %d", i);
>    g_idle_add (process_message, str);
>    sleep (1)
>  }
> }
>
> process_message (.. char *str)
> {
>  gtk_label_set (app->status, str);
>  g_free (str);
> }
>
> John