public int autoroute_pass(int p_pass_no){
  try {
    return autoroute_pass_try(p_pass_no);
  }
 catch (  Exception exc) {
    hdlg.userPrintln(classname + "autoroute_pass",exc);
    air_line=null;
    return 0;
  }
}

public int autoroute_pass ( int p_pass_no ) { try { return autoroute_pass_try ( p_pass_no ) ; } catch ( Exception exc ) { hdlg . userPrintln ( classname + "autoroute_pass" , exc ) ; air_line = null ; return 0 ; } }
autoroute one pass of all items of the board .
