Problem in updating progress bar

["DC A" <adc4444 hotmail com>]

What could be the reason for using gtk_events_pending() and 
gtk_main_iteration() in the following code snippet:


for( gflt=0; gflt<=1;  ){
       gtk_progress_bar_update( (GtkProgressBar*)pbar, gflt );
       //update
       while (gtk_events_pending ())
           gtk_main_iteration ();
       gflt += 0.1;
       sleep(1);
      if ( gflt > 1 ) break;
   }

why the code cannot update the progressbar without these two functions? I 
saw the API but still it is not clear to me.

Thanks.

--AD

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