Some more memory paged in (to my brain). It's the Pause that returns
an updated PET, but while paused, something else needs that current
PET to Release you. I suspect the updated PET isn't stored until the
Release is done, but that's internal processing and so isn't
guaranteed (although the usual considerations apply).
If the Pause immediately overwrote the current PET, you'd be in limbo
forever, I guess, as the correct PET would be lost (currently, it
could easily be "guessed" (from what I've seen), but IBM could also
easily get more creative in how they're updated).
Frankly, I'm not sure what problem the PET-updating is supposed to
solve. It definitely makes the service harder to use, but maybe
that's the point ;-)
Re alignment: I suppose almost everything benefits from the best
alignment you can reasonably give it, all else equal. LM and STM
don't imply doubleword alignment is especially needed, although again,
that's internals, and subject to change.
Post by Charles Mills
Should the doc contain a hint that performance would be improved if the
token were doubleword aligned? I looked and looked for such an assertion,
and finding none, took it that a character field is a character field is a
character field. Why not document as two doublewords, or at least point out
that doubleword alignment would be beneficial?
Behalf Of Peter Relson
Sent: Thursday, October 5, 2017 4:59 AM
Subject: Re: IEAVPSE parameter question
It is fine with z/OS itself if you use the same field for both the input
token and the updated token.
Whether it works for you will depend on whether you care. Maybe your
recovery looks at something that wants to know if you still have the old
token vs the updated one.
The functionality of IEAVPSE (and the other similar "pause" targets, but not
-- does a LM of the token into registers while running in your state and key
-- PC's to change state (where the target uses the registers
and never looks at the parameter list)
-- does a LM into registers of the updated token
-- PR's back to your state and key
-- STM's to your updated-token
z/OS Core Technology Design
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