Ensuring that exit routines exist at the time of the association

If the work involved in issuing the ADD request is costly, you might issue the QUERY request with the QTYPE=ADD parameter to find out whether any exit routines are associated with the exit. This step would help you avoid unnecessary processing. Here is an example, in pseudocode, of using the QUERY request:

QTYPE=ADD:

  Issue REQUEST=QUERY with QTYPE=ADD
  IF the return code indicates "there are no exit routines" THEN
    (perhaps no PROGxx parmlib member associated a exit routine
      with this exit)
    Add a "default" module to the exit.
  ENDIF