Re: Problem with Threading Concept

[naveen <naveen galieosoft com>]

Sir,

yes you are right some many people told me not to use
gtk_main_iteration.

I should use gdk_threads_enter() and gdk_threads_leave (),
only when i am using widgets in the main thread.Now solved
my problem by the help gtk lists.

I have done my application using databox-0.7.0.0 in linux i want the
same application to be run in windows. Please can you give me some tips
how i can run in windows..


Thanks and Regards,
Naveen.


On Thu, 2007-02-22 at 22:30, gtkdatabox-list-request gnome org wrote:Re:
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> Today's Topics:
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>    1. Re: Problems with Threading Concept (Roland Bock)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 21 Feb 2007 19:30:00 +0100
> From: Roland Bock <box2OO6 eudoxos de>
> Subject: Re: Problems with Threading Concept
> To: gtkdatabox <gtkdatabox-list gnome org>
> Message-ID: <45DC8FA8 5030602 eudoxos de>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> Hi Naveen,
> 
> when it comes to multi-threading, I have almost no experience at all. If
> I read the code right, you have the main thread which creates a
> secondary thread which does nothing but print statements and calling
> gtk_main_iteration.
> 
> I suspect that the delay is in the gtk_main_iteration. You could add
> some print statements after that function call (I love debugging by
> printf).
> 
> To be honest, I don't consider it wise to have gtk_main_iteration being
> called in the second thread when gtk_main is called in the first thread.
> That sounds like trouble.
> 
> If that does not help (quite likely), you should ask somebody with gtk
> AND threading experience.
> 
> 
> Regards,
> 
> Roland
> 
> naveen wrote:
> > Hi all,
> > 
> > I have GUI developed based on gtk+-2.2.0,
> > 
> > 1) I have button to start some process (continuous).
> > 2) I need to stop that process, when i click the same button.
> > 
> > to do the above tasks i developed a small application using threading
> > concepts...
> > 
> > //////////////////////////////////////////////
> > #include <gtk/gtk.h>
> > #include "stdio.h"
> > #include <pthread.h>
> > 
> >  int flag=1,toggle=0;
> >     int i=0;
> >     pthread_t yes_tid; 
> > 
> > void hello()
> > {
> > 
> >     while (flag)
> >     {
> >   gdk_threads_enter ();
> > 
> >       printf ("%d %d\n",i++,flag);
> >       if (gtk_events_pending())
> >       gtk_main_iteration(); // Handle unprocessed GTK events
> > 
> >   gdk_threads_leave ();
> >     }
> > 
> > }
> > 
> > void hello_print( GtkWidget *widget,
> >             gpointer   data )
> > {  
> >    if(toggle==0)
> >     {
> >      toggle=1;
> >      flag=1;
> >      pthread_create (&yes_tid, NULL,(void *)hello, NULL);
> >     }
> >     else
> >     {
> >      flag=0;
> >      toggle=0;
> >     }
> > 
> > }
> > int main(int   argc,
> >           char *argv[] )
> > {
> >     
> >     GtkWidget *window;
> >     GtkWidget *button;
> >     g_thread_init (NULL);
> >     gdk_threads_init ();
> > 
> >   gdk_threads_enter ();
> > 
> >     gtk_init (&argc, &argv);
> >     
> >     /* create a new window */
> >     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
> >     
> >     g_signal_connect (G_OBJECT (window), "destroy",
> > 		      G_CALLBACK (gtk_main_quit), NULL);
> >     
> >     gtk_container_set_border_width (GTK_CONTAINER (window), 100);
> >     
> >     button = gtk_button_new_with_label("click it");
> >     
> >     g_signal_connect (G_OBJECT (button), "clicked",
> > 		      G_CALLBACK (hello_print), NULL);
> >     
> >     gtk_container_add (GTK_CONTAINER (window), button);
> >     
> >     gtk_widget_show (button);
> >     gtk_widget_show (window);
> >     
> >     gtk_main ();
> > 
> >    gdk_threads_leave ();
> > 
> >     return 0;
> > }
> > 
> > //////////////////////////////////////////////////////
> > But the problem here for me is, the stop is not happening immediatly
> > after the click..
> > 
> > Is there any mistake the way i am doning it ... or do i need to follow
> > any other procedure for it.. please help me out...
> > 
> > Regards,
> > Naveen.
> > 
> > _______________________________________________
> > gtkdatabox-list mailing list
> > gtkdatabox-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtkdatabox-list
> > 
> 
> 
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