LinuxQuestions.org - [SOLVED] GTK newbie

Hi, I hope somebody can help me, my program crashes if I uncomment the line "gtk_label_set_text(label,buf);" from the "timer" function. Application works fine to me, I just want a very simple cronometer, and it works if I keep that line commented, the problem is that I can only show the cronometer to the console, and I want it in the GUI.

I don't know why the gtk_label_set_text function works in my function "arranca" but crashes in function "timer", any ideas?

Code:

#include <gtk/gtk.h>

#include <time.h>

#include <stdio.h>



gint count = 0;

char buf[8];



void timer(GtkWidget *widget, gpointer label){

 clock_t comienzo;

 comienzo=clock();



 while(count){

   sprintf(buf,"%.2f",(clock()-comienzo)/(double)CLOCKS_PER_SEC );

   printf("%s\r",buf);

   //gtk_label_set_text(label,buf);

 }

}



void arranca(GtkWidget *widget, gpointer label){

  if(count==0)count=1;

  else count=0;

  GThread *thread;

  

  gtk_label_set_text(label,(count==1)?"Corriendo":"Alto");

  if(count==1)

     thread=g_thread_create((GThreadFunc)timer, label, FALSE, NULL);

}



int main(int argc, char** argv) {

 

  clock_t comienzo;

  int test;



  GtkWidget *label;

  GtkWidget *window;

  GtkWidget *frame;

  GtkWidget *button;

  

  gtk_init(&argc, &argv);

  

  g_thread_init(NULL);



  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

  gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);

  gtk_window_set_default_size(GTK_WINDOW(window), 250, 150);

  gtk_window_set_title(GTK_WINDOW(window), "CRONOMETRO");



  frame = gtk_fixed_new();

  gtk_container_add(GTK_CONTAINER(window), frame);



  button = gtk_button_new_with_label("START/STOP");

  gtk_widget_set_size_request(button, 90, 35);

  gtk_fixed_put(GTK_FIXED(frame), button, 50, 50);



  label = gtk_label_new("Alto");

  gtk_fixed_put(GTK_FIXED(frame), label, 180, 60); 

  

  gtk_widget_show_all(window);



  g_signal_connect(window, "destroy",

      G_CALLBACK (gtk_main_quit), NULL);

      

  g_signal_connect(button, "clicked", 

      G_CALLBACK(arranca), label);



  gdk_threads_enter();

  gtk_main();

  gdk_threads_leave();



  return 0;

}