As nobody else seems to want to follow up on this, I'll try to...
(Please, no *personal* replies to me. Follow up to the list.)
> > Maybe there is a reason that can explain this phenomenon. You can launch a
> > thread with g_idle_add or g_time_out_add,
>
Sorry, either you are misunderstanding seriously, or just using the
term "thread" in a way that nobody else does. g_idle_add() and
g_timeout_add() do *not* "launch" any threads. The callback functions
passed as parameters to these functions run in the same thread that
runs the main loop in question. (That might of course be a different
thread than the one where you called g_idle_add() or g_timeout_add(),
but anyway, no new thread creation is involved.)
> > nevertheless, this new thread can
> > not run with your main thread simultaneously.
>
"can not" or "should not"? threads that can not run simultaneously
would be rather pointless, I think;) Anyway, if your following text
is based on the wrong belief that g_idle_add() or g_timeout_add()
create new threads, it is pointless to try to understand what you try
to say.
--tml
===========================================
Thanks for your reply. I think I make a mistake about the concept. Following is my summary:
1) g_idle_add() or g_timeout_add() is not related to "thread", but related to "event-loop".
2) When you call the sleep() function in the callback function of g_idle_add or g_time_add, your whole program will wait;
When you call the sleep() in other "thread", the whole program will not wait.
3) Would the callback function be called till gtk_main() being called? (you can examine the example below )
--------------------
#include <glib.h>
static gpointer cursor_change(gpointer data_pass)//2
//static gboolean cursor_change(gpointer data_pass)//1
{
//1 ---
/*fprintf(stderr, "In cursor_change\n");
sleep(10);
return TRUE;*/
//2 ---
gint i=0;
while(1)
{
gdk_threads_enter();
fprintf(stderr, "thread:%d\n", i++);
sleep(10);
gdk_threads_leave();
}
}
void callback (GtkButton* pbtn, gpointer data)
{
fprintf(stderr, "In Button Callback\n");
}
int main( int argc, char *argv[] )
{
gtk_init (&argc, &argv);
if (!g_thread_supported ())
{
g_thread_init(NULL);
gdk_threads_init();
}
//1 ---
//g_idle_add( cursor_change, NULL);
//2 ---
//g_timeout_add(1, cursor_change, NULL);
//3 ---
g_thread_create ( cursor_change, NULL, FALSE, NULL);
//5 ---
//sleep(100);
//6
GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
GtkWidget *button = gtk_button_new_with_mnemonic ("button");
g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (callback), NULL);
gtk_widget_show (button);
gtk_container_add (GTK_CONTAINER (window), button);
gtk_widget_show (window);
gtk_main ();
return 0;
}
--
Sincerely,
Alfred Young
R&D, Application Architectures
www.foxitsoftware.com
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