Event pending problem

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In the code:


for(gflt=0; gflt <=1; )
   {
       gtk_progress_bar_update((GtkProgressBar*)pbar, gflt);

       while(gtk_events_pending())
          gtk_main_iteration();

       gflt += 0.1;
       sleep(1);

       if( gflt > 1) break;
   }


Why use while loop for event pendings? You can clearly see that there is 
only one event pending which is gtk_progress_bar_update. so why looking for 
others? Thanks.


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