Re: Multi-threaded UI Freezes on GDK Call

[G Hasse <gh raditex se>]

On Tue, Dec 18, 2007 at 04:45:50PM -0500, Michael McCann wrote:
> I've got a multithreaded GTK application. One thread runs gtk_main():
>
> gtk_threads_enter();
> gtk_main();
> gtk_threads_leave();
>
>
> The other thread is an infinite loop that sleeps for one second on each 
> loop. Every x seconds, the infinite loop calls a function, which makes 
> some GDK calls. At the beginning of this function, gdk_threads_enter() 
> is called; at the end, gdk_flush() and gdk_threads_leave() is called.
>
> Whenever this function is called, the UI freezes and CPU usage jumps to 
> 100% for about one second (no other applications freeze, of course). 
> I've tried calling gdk_threads_leave()/enter() before and after each GDK 
> call to no avail. I run g_thread_init() and gdk_threads_init() at the 
> beginning of my program.
>
> In the function, gdk_screen_get_default(), gdk_screen_get_root_window(), 
> gdk_pixbuf_get_from_drawable(), and gdk_pixbuf_save_to_bufferv() are 
> called.
>
> I'm using NetBSD on a P4 1.2GHz. What am I doing wrong? I've asked this 
> question on IRC (irc.gnome.org, #gtk+) but noone seems to know the problem.

The wrong thing is trying to do threads!

Why Why Why are all people doing this thread programing! 
I am convinced that with a propper design of your application,
maybe in several processe, you don't need threads and your
problem will go away...

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> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list

-- 
Göran Hasse

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