<snip> There are many easy ways to serialize the entry and exiting of an ENF exit or any other kind of hook so that you can know when it is safe to free up the CSA it uses and remove the code. One way I have used in the past is to increment an exit-in-use counter with CS logic upon entry and decrement it with similar CS logic upon exit. If the counter is zero, you can free up the CSA control block. Of course, you must first ensure that the routine is never entered again before you start the removal process. <e-snip>
I disagree completely. There is no way, easy or otherwise, to serialize this unless you control the issuance of the event (which for ENF you do not). Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
