using Gtk;

public int test(Button button)
{
       Thread.usleep(5000000) ;
       button.label = "You thank" ;
       return 0 ;
}



int main (string[] args) {
    Gtk.init (ref args);

    var window = new Window ();
    window.title = "First GTK+ Program";
    window.border_width = 10;
     window.window_positi
    window.set_default_size (300, 70);
    window.destroy.connect (Gtk.main_quit);

     var butt Button.with_label ("Click me!");
    button.clicked.connect (() => {
        //button.label = "Thank you";
        run_in_thread<int>(()=> { return test(button);}) ;  
    });

    window.add (button);
    window.show_all ();

    Gtk.main ();
    return 0;
}

public delegate G TaskFunc<G> () throws Error;
 
public async G run_in_thread<G> (owned TaskFunc<G> func) throws Error {
 SourceFunc resume = run_in_thread.callback;
 Error err = null;
 G result = null;
 new Thread<void*> (null, () => {
  try {
   result = func ();
  } catch (Error e) {
   err = e;
  }
  Idle.add ((owned) resume);
  return null;
 });
 yield;
 if (err != null) {
  throw err;
 }
 return result;
}