Re: GTK Thread init problem

[James Scott Jr <skoona verizon net>]

On Tue, 2007-04-17 at 13:56 +0530, prabahar k wrote:
> Hi
>
> Thanks Tristan for u r suggestion for using g_thread_create.
> Thanks James for u r nice code.
>
>
> Also If we want to retain the p_thread_create() in the program then
> its enough to change the compile time flags to include
> `pkg-config --cflags --libs gtk+-2.0 gthread-2.0`
> Its working fine.
>
> Here is the code:
> /**************************gtk19mod.c************************
>  compile:
>  gcc -g -o gtk19mod gtk19mod.c `pkg-config --cflags --libs gtk+-2.0
> gthread-2.0`
> ************************************************************/
>
> #include <gtk/gtk.h>
> #include <glib.h>
> #include <pthread.h>
> pthread_t thrd1;
>
> void destroy (GtkWidget *widget, gpointer data)
> {
>  gtk_main_quit ();
> }
>
> void *argument_thread (void *args)
> {
>
>
>  for (;(*(gboolean *)args);)
>    {
>      /* sleep a while */
>          g_usleep(1000000);
>          g_print("Inside thread");
>    }
>  g_thread_exit (NULL);

OK, but don't mix the threading api's.  remove the g_thread_exit().  For
portability and stability - I always use glib's threading apis when
using GTK/GDK.  

James,


>  return NULL;
> }
>
> int main (int argc, char *argv[])
> {
>  GtkWidget *window;
>
>  gboolean  b_run_flag = TRUE;
>
>  /* init threads */
>  g_print("Going thread init\n");
>
>  g_thread_init (NULL);
>  gdk_threads_init ();
>
>  gdk_threads_enter ();
>
>  gtk_init(&argc, &argv);
>
>  g_print("After init\n");
>  /* create a window */
>
>  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>  gtk_signal_connect (GTK_OBJECT (window), "destroy",
>                      GTK_SIGNAL_FUNC (destroy), NULL);
>  gtk_container_set_border_width (GTK_CONTAINER (window), 10);
>  gtk_widget_show (window);
>
>
>  pthread_create (&thrd1, NULL, argument_thread, (void*)&b_run_flag);
>
>
>  gtk_main ();
>  gdk_threads_leave ();
>
>  b_run_flag = FALSE;
>  return 0;
> }
> /************End*******************************************/
>
>
> On 4/17/07, James Scott Jr <skoona verizon net> wrote:
> > On Mon, 2007-04-16 at 18:09 +0530, prabahar k wrote:
> >
> > hi i am trying to use a threaded GTK program. While running theprogram it gives segmentation fault and it 
> > seem to be anthread init problem. is there any thing i am missing? Pleasegive u r comments.
> > the code is:/***********************gtk19.c**************************/#include <stdio.h>#include 
> > <stdlib.h>#include <unistd.h>#include <time.h>#include <gtk/gtk.h>#include <glib.h>#include <pthread.h>
> > pthread_t thrd1;
> > void destroy (GtkWidget *widget, gpointer data){ gtk_main_quit ();}
> > void *argument_thread (void *args){gdk_threads_enter (); for (;;)   {     /* sleep a while */
> >
> >
> >          sleep(1);         g_print("Inside thread");
> >
> >    }gdk_threads_leave (); return NULL;}
> > int main (int argc, char *argv[]){ GtkWidget *window;
> >   /* init threads */
> >  g_thread_init (NULL); gdk_threads_init (); /* init gtk */ gdk_threads_enter ();/*[Line :70] */           
> >      gtk_init(&argc, &argv);
> >  g_print("After init\n");
> >  /* create a window */ window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
> >  gtk_signal_connect (GTK_OBJECT (window), "destroy",                     GTK_SIGNAL_FUNC (destroy), NULL);
> >  gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_show (window);
> >  pthread_create (&thrd1, NULL, argument_thread, NULL);
> >  gtk_main (); gdk_threads_leave ();
> >  return 0;}/**************************************************/
> > I compile it asgcc -Wall -g gtk19.c -o base -lpthread `pkg-config --cflags gtk+-2.0``pkg-config --libs 
> > gtk+-2.0` `gtk-config --cflags --libs gthread`
> >
> > ---
> > prabahar
> > _______________________________________________gtk-app-devel-list mailing listgtk-app-devel-list gnome 
> > orghttp://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> >
> >
> >
> > prabahar,
> >
> > I just modified your code to show the needed changes.  Notice that the
> > gdk_threads_enter/leave is removed from the thread and the thread is created
> > using glib's api.  I also updated the includes and compile command.
> >
> > James,
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