OK, I'll bite. Why do you need to determine?
If you have any reason to think that the page is protected (presumably
because you did it or might have done it), then you can just unprotect it.
A page does not need to be protected in order to successfully unprotect.
Note that protection is not a
On Wed, 25 Jul 2007 07:27:15 -0400, Peter Relson [EMAIL PROTECTED] wrote:
OK, I'll bite. Why do you need to determine?
If you have any reason to think that the page is protected (presumably
because you did it or might have done it), then you can just unprotect it.
A page does not need to be
On Wed, 25 Jul 2007 12:08:42 -0500 Paul Schuster [EMAIL PROTECTED]
wrote:
:On Wed, 25 Jul 2007 07:27:15 -0400, Peter Relson [EMAIL PROTECTED] wrote:
:
:OK, I'll bite. Why do you need to determine?
:
:If you have any reason to think that the page is protected (presumably
:because you did it or
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Binyamin Dissen
Sent: Wednesday, July 25, 2007 12:28 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Is a page protected?--how to determine
On Wed, 25 Jul 2007 12:08:42 -0500 Paul Schuster
are strictly my own.
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Paul Schuster
Sent: Wednesday, July 25, 2007 12:09 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Is a page protected?--how to determine
On Wed, 25 Jul 2007 07:27:15 -0400, Peter
...
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of McKown, John
Sent: Wednesday, July 25, 2007 1:55 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Is a page protected?--how to determine
From what I remember from the deep-dark-past, LPA is never paged-out. So
:55 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Is a page protected?--how to determine
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Binyamin Dissen
Sent: Wednesday, July 25, 2007 12:28 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Is a page
Hello: I have a need to determine if an address in storage is page protected
in order to determine if a PGSER UNPROTECT needs to be done.
The best I have tried and seen in earlier posts is to look for a CC=1 on a
TPROT backed up with an ESTAE.
Are there any other methods to do this?
Thank you.
Paul,
You are in the right way. I think this is the same technique used in NUCLEUS
by CSECT IEAVEVAL but with a FRR instead.
Regards,
Philippe Leite
z/OS Systems Programmer
Portugal
On Tue, 24 Jul 2007 01:32:43 -0500, Paul Schuster
[EMAIL PROTECTED] wrote:
Hello: I have a need to determine
Subject: Is a page protected?--how to determine
Hello: I have a need to determine if an address in storage is page
protected
in order to determine if a PGSER UNPROTECT needs to be done.
The best I have tried and seen in earlier posts is to look for a CC=1 on a
TPROT backed up with an ESTAE
Sent: Tuesday, July 24, 2007 1:32 AM
Subject: Is a page protected?--how to determine
Hello: I have a need to determine if an address in storage is page
protected
in order to determine if a PGSER UNPROTECT needs to be done.
The best I have tried and seen in earlier posts is to look for a CC=1
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Paul Schuster
Sent: Tuesday, July 24, 2007 12:33 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Is a page protected?--how to determine
Hello: I have a need to determine if an address in storage
: bit.listserv.ibm-main
To: IBM-MAIN@BAMA.UA.EDU
Sent: Tuesday, July 24, 2007 8:22 AM
Subject: Re: Is a page protected?--how to determine
David,
Actually, ISVK cannot tell you if a page is protected or not, it only
shows you
the storage key and fetch bit. The Page protection bit (bit 54) is in Page
Table
In a message dated 7/24/2007 1:33:11 A.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
I have a need to determine if an address in storage is page protected
in order to determine if a PGSER UNPROTECT needs to be done.
One way, not necessarily the most elegant, is to establish an
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of (IBM Mainframe Discussion List)
Sent: Tuesday, July 24, 2007 8:07 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Is a page protected?--how to determine
In a message dated 7/24/2007 1:33:11 A.M
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Paul Schuster
Sent: Tuesday, July 24, 2007 12:33 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Is a page protected?--how to determine
Hello: I have a need to determine if an address in storage
In a message dated 7/24/2007 10:56:09 A.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
very bad idea in general. if the page is not protected, then you
don't know what other processes are updating that page nor how
they serialize their updates. the OI is not an interlocked update
and
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of (IBM Mainframe Discussion List)
Sent: Tuesday, July 24, 2007 10:05 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Is a page protected?--how to determine
In a message dated 7/24/2007 10:56:09
There's no obvious way for an unauthorized program to discover that
information.
If you're a supervisor state program you can issue a TPROT with a key of
0. If the condition code is 1 then the page is protected. The
interpretation of the other condition codes is left as an exercise to
the
In a message dated 7/24/2007 11:14:10 A.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
Because the fetch and the store are separated in time. Another CPU or an
I/O operation can store into the byte *after* your CPU fetches the byte
but *before* your CPU stores the byte. The other CPU
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