Re: Threads

[Olexiy Avramchenko <olexiy ctech cn ua>]

Russell Shaw wrote:

> Ok, in gtkmain.c:
>
> void
> gtk_main (void)
> {
>   ...
>   if (g_main_loop_is_running (main_loops->data))
>     {
>       GDK_THREADS_LEAVE ();
>       g_main_loop_run (loop);
>       GDK_THREADS_ENTER ();
>       gdk_flush ();
>     }
>   ...
> }
>
> So if g_main_loop_run() runs for the duration of the app, then there 
> is nothing
> guarding gdk calls made by gtk callbacks. So, doesn't this mean that 
> every gtk
> operation in a gtk callback that eventually calls a gdk function, 
> should be
> surrounded by gdk_threads_enter()/leave() ?

GTK register a gtk_main_do_event() function to be called on every event 
(see gdk_event_handler_set in "gtk/gtkmain.c"). GDK locks the mutex 
before gtk_main_do_event() call (see gdk_event_dispatch in 
"gdk/x11/gdk-events-x11.c"). Every gtk callback invoked from main loop 
will be automatically protected. You should protect only code in 
*timeout* and *idle* callbacks, because they run outside gdk event 
dispatching code.

   Olexiy