Re: GTK Thread init problem

["prabahar k" <informpraba gmail com>]

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);

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,