Re: drawing area won't refresh on X11 unless touched, app ismultithreaded, gtk 2.0

["Jimmy Firewire" <trigonometric softhome net>]

> Hello,
>
> I had a similar problem in my application.
>
> First, gtk_thread_init bombs if you link in the
> incorrect library with gtk 2.0.  Make sure you use:
> pkg-config --libs gthread-2.0    or
> $(shell pkg-config --libs gthread-2.0) for gmake
> when linking your application.

This was it, I was linking to glib12.

> Second, I would add the following prior to calling
> gtkmain():
>
> if(!g_thread_supported()) {
>     g_thread_init(NULL);
>     gdk_threads_init(); }
> else ????

OK.

> gdk_threads_enter();
> gtk_main();
> gdk_threads_leave();

Well I am doing this:

pthread_create(&gtk_main_thread,NULL,gtk_main,NULL);

But I would be cautious about wrapping gtk_main with those calls because
wouldn't that make the event loop starve everyone else out like Xiong Huan
says in his post?

> gtk is not thread safe, so any time you call the gtk
> api, you have a critical section. So.
>
> while(1) {
>     sleep(1);
>     gdk_threads_enter();
>     x = (gdouble)((double)random()/
>         RAND_MAX)*drawing_area->allocation.width;
>     y = (gdouble)((double)random()/
>         RAND_MAX)*drawing_area->allocation.height;
>     draw_brush(drawing_area,x,y);
>     gdk_threads_leave();
>  }

OK.

> Hope this helps.

Immensely, it now works without a hitch, thanks for your time.

trigonometric