On 12/10/2011 9:44 AM, Martin Truebner wrote:
Once your minimum supported operating system enables use of a particular
semi-privileged instruction, then you can use it just the same as you would any
new macro-based system service provided by that same level of the OS.
Well said
(with the restrictions Ed pointed out) I see no reason not to
use SPKA to go in and out of user key in CICS
or
use the linkage stack (where appropriate).
It would be nice if there
would be a way to temporary suspend (make it impossible to use) the
linkage stack... Could have avoided lots of headache.....
Steve- what about SAC (q) - should its used be banned as well?
Well, remember my focus is always on applications, not system or
system-enhancing or -extending code such as exits. Do you think
applications have a need for using SAC?
I don't like to 'ban' instructions, just to be aware of instructions
that may have restrictions. Clearly, applications code has no
business using privileged instructions; semiprivileged instructions
are a little ambiguous in that context.
I once taught in a shop where the top manager banned BXLE - he thought
it was too hard to understand! (Which, of course, said a lot about the
manager.)
--
Martin
Pi_cap_CPU - all you ever need around MWLC/SCRT/CMT in z/VSE
more at http://www.picapcpu.de
--
Kind regards,
-Steve Comstock
The Trainer's Friend, Inc.
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