Thank you
Seems that for sp 0 - 127 it is TCBPKF
SUBPOOL Location Type Owner
Storage Key
0-127 Private low Pageable Task TCB
Same as TCB
key
at time
of
first
storage
request.
Same as TCB
Other wise table 10 - 3 IN - 10.3.1.4 Selecting the Storage Key
describes what the virtual storage key will be
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Binyamin Dissen
Sent: Saturday, April 21, 2012 6:34 PM
To: [email protected]
Subject: Re: Explination of S0C4 reason code 4 and related data areas
On Fri, 20 Apr 2012 17:19:25 -0400 Micheal Butz <[email protected]>
wrote:
:>Was wondering If someone could clear up some things for me
:>A S0C4 reason code 4 means the storage key and the PSW key don't match
:>typically trying to access storage key 0 when the PSW key is key 8
Usually update, but on occasion fetch.
:>Two questions arise from this
:>. Does it matter what the PSW key at the time of the STORAGE
OBTAIN
:>was e.g.
:>1. Obtaining storage from subpool 0 where the storage key is 8 and
PSW
:>key at the time for what ever reason was in KEY 0.
What does "Obtaining storage from subpool 0 where the storage key is 8"
mean?
TCB key?
:> Would I have to set the PSW Key to 0 if I were trying to access that
:>storage later on say while running in some other task because when I did
the
:>STORAGE OBTAIN the PSW KEY 8 - 11 was 0
SP=0 when Supervisor/key=0 is special in that it is converted to subpool 252
which is in key 0.
:>2. The same situation would be then true if access CSA storage
subpool
:>241 with Key=8 ( Iknow a no no) but the PSW KEY was 0. Later on when
trying
:>to access/modify the storage would I have to set PSW key 8 - 11 have to be
0
:>. Of what significance does is the key the TCB (TCBPKF) since it
:>seems only PSW KEY 8 - 11 and the key the page of the storage is seems to
be
:>relevant
Look at the "Selecting the Right Subpool for Your Virtual Storage Request"
section in "MVS Programming: Authorized Assembler Services Guide"
--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com
Director, Dissen Software, Bar & Grill - Israel
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