On Tue, 2007-10-02 at 10:51 -0400, [EMAIL PROTECTED] wrote:
> I'm still muddling my way through my first GTK application (and I'm a
> relative newbie on all software matters).
>
> I have the following in one of my callbacks:
>
> timer = g_timout_add(50, (GSourceFunc) progress_update,
> (gpointer)progressbar);
>
> pid = fork( );
>
> if (pid == 0)
> {
> growPart ( );
> exit(0);
> }
> ret = wait(NULL);
>
> g_source_remove(timer);
>
> ---------------
>
> where progress_update is:
>
> static gboolean progress_update (gpointer progressbar)
> {
> gtk_progress_bar_pulse(GTK_PROGRESS_BAR(progressbar));
> return true;
> }
>
> ----------------
>
> I was hoping that this would mean that the progress bar would pulse while
> growPart() was running, but instead it waits until after (is this because
> control hasn't been returned to gtk_main yet?) at which point it is
> removed. If I take out the g_source_remove it runs beautifully....but only
> after growPart has completed. How can I get around this?
>
> Thanks so much
>
The use of FORK is a little odd, I don't think I've seen that used in a
GTK program before. The ret=wait(null) causes execution to stop at that
point and wait for growPart() to finish. A way to get around the
logistics of fork() is to use threads directly. Consider the following;
/* globals */
gboolean b_pulse_control = FALSE
GThread *grow_thread_id = NULL;
gint global_ret = 0;
b_pulse_control = TRUE;
timer = g_timeout_add(50, (GSourceFunc) progress_update,
(gpointer)progressbar);
grow_thread_id = g_thread_create ( growPart_thread, &b_pulse_control,
TRUE, NULL);
static gboolean progress_update (gpointer progressbar)
{
if (b_pulse_control)
{
gtk_progress_bar_pulse(GTK_PROGRESS_BAR(progressbar));
return true;
} else {
global_ret = GPOINTER_TO_INT( g_thread_join (grow_thread) );
return FALSE;
}
}
static gpointer growPart_thread(gpointer b_pulse)
{
/* do work */
growPart();
*b_pulse = FALSE;
g_thread_exit( GINT_TO_POINTER( 1 ) );
}
I would do the passing of control values via a structure to avoid the use of
globals, but this should work for you.
James,
>
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