On Thu, 12 Sep 2024 01:36:51 +0000 Richard Zierdt
<[email protected]> wrote:

:>PC routines are not supposed to issue SVCs as I understand it.

You understand wrong.

:>However, WTO and WAIT work (for me, in my single user environment).
:>Has the PC - no SVC restriction been relaxed, or opened up to particular SVC 
types?

There never truly was such a restriction (maybe if a PC-CP issued PCLINK?)

The issue is the system state that the PC may cause. If it is a PC-SS then all
services called by the routine must support PASN<>HASN.

:>Also, a PC routine issuing a WAIT ecb,LINKAGE=SYSTEM  also works.  This WAIT 
issues a PC call itself, and PCs can call other PCs.

:>Nonetheless, is issuing  WAIT ecb,LINKAGE=SYSTEM  from a PC playing with 
fire?  BTW, Key zero is not required.

If you are in a supported environment, no problem.

To generalize, zOS recognizes various states that will cause it to refuse to
perform some services. Among them:

PASN<>HASN
Secondary mode
Home mode
Physically disabled
Locked
EUT

:>[This PC creates a couple of Name-Tokens to communicate with another address 
space, then WAITs.  The other address space invokes a IEAMSXMP = Safe 
cross-memory Post = service to end the WAIT.]

--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com

Director, Dissen Software, Bar & Grill - Israel

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