I sure missed that one with the locks. PLO CDS does exactly what is wanted. It does 2 CS's within the locked instruction.
PLO CSDST on the other hand only does a single CS followed by 2 ST's. Since 3 separate load instructions (not under PLO control) are required when not in contiguous storage, there is not any method that will guarantee the 3 values are consistent with the others. A counter as suggested by Peter Relson won't help either for this same reason. I can't think of a situation where PLO CSDST is useful. Can anyone describe a situation where it is useful? Jon Perryman. >________________________________ > From: Rob Scott <rsc...@rocketsoftware.com> > > > >I think the OP stated that his code could hold locks - in which case the latch >services cannot be used. > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
