Многопотоковая прога на GTK+(Glade)?

#include <stdlib.h>
#include <stdio.h>
#include <gtk/gtk.h>
#include <glade/glade.h>
#include <pthread.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <unistd.h>
 
GladeXML *xml;
GtkWidget *entry1, *entry2, *entry5;;
unsigned short awBuf[64];
static char screen[32];
int ism=1, ism1=1, buf=7, buf1=8;
gboolean bool;
pthread_attr_t attr;
pthread_t thread;
int a=1, b=0;
 
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
void* potok(void* arg)
{
    //int a=1, b=0;
    entry5 = glade_xml_get_widget(xml, "entry5");
while(1)
{   
  sprintf(screen, "%i\0", a);
  gtk_entry_set_text(GTK_ENTRY(entry5), screen);
    
  sleep(1);
    
  sprintf(screen, "%i\0", b);
  gtk_entry_set_text(GTK_ENTRY(entry5), screen);
  sleep(1);
}
return NULL; 
}
//---------------------------------------------------------------------------------
void on_checkbutton2_clicked(gpointer user_data, GtkCheckButton *checkbutton2)
{
  bool = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(checkbutton2));
  if (bool == TRUE) awBuf[0]=1; else awBuf[0]=0;
  sprintf(screen, "%li\0", awBuf[0]);
  gtk_entry_set_text(GTK_ENTRY(user_data), screen);
}
//---------------------------------------------------------------------------------
void on_button1_clicked(GtkButton *button)
{
  //pthread_attr_init(&attr);
  //pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  pthread_create(&thread, NULL, &potok, NULL);
  //pthread_join(thread, NULL);
}
//---------------------------------------------------------------------------------
void on_button2_clicked(GtkButton *button)
{
    //pthread_exit(thread);
    gtk_main_quit();
    
}
//---------------------------------------------------------------------------------
int main (int argc, char *argv[])
{   
  //pthread_create(&thread, NULL, potok, NULL);
   
  gtk_init(&argc, &argv);
  glade_init();
  xml = glade_xml_new("Fb.glade", "rootwnd", NULL);
  if(!xml)
  {
    g_warning("Failed to create the interface");
    return 1;
  }
  //entry5 = glade_xml_get_widget(xml, "entry5");
 
  entry1 = glade_xml_get_widget(xml, "entry3");
  sprintf(screen, "%i\0", buf);
  gtk_entry_set_text(GTK_ENTRY(entry1), screen);
  
  entry2 = glade_xml_get_widget(xml, "entry4");
  sprintf(screen, "%i\0", buf1);
  gtk_entry_set_text(GTK_ENTRY(entry2), screen);
  
  pthread_create(&thread, NULL, potok, NULL);
 
  glade_xml_signal_connect(xml, "gtk_main_quit", G_CALLBACK(gtk_main_quit));
  glade_xml_signal_connect(xml, "on_checkbutton2_clicked", G_CALLBACK(on_checkbutton2_clicked));
  glade_xml_signal_connect(xml, "on_checkbutton1_clicked", G_CALLBACK(on_checkbutton1_clicked));
  glade_xml_signal_connect(xml, "on_button1_clicked", G_CALLBACK(on_button1_clicked));
  glade_xml_signal_connect(xml, "on_button2_clicked", G_CALLBACK(on_button2_clicked));
  
gtk_main();
//
return 0;
}