I had the same question on the CNZ_WTOMDBEXIT work area.

There they say you cannot store information from one invocation to another, but 
not to leave anything sensitive behind. IIRC.

I assumed (yes, I know) that it was effectively "private" to the invoked exit 
instance (either serialized or a unique member of a set) and so far the code 
has not crashed or shown evidence of a collision.

Charles


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of John McKown
Sent: Thursday, October 10, 2019 5:16 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: SMF exit IEFU086 work area size

On Thu, Oct 10, 2019 at 7:04 AM Peter Relson <rel...@us.ibm.com> wrote:

> <snip>
> I can't find any documentation in KC on how to customize the size of the
> workarea in SMPRMxx or what the minimum size of the area is.
> </snip>
>
> The size is not customizable. 1024 is the size. The commentary on
> SMXP_WORKAREA_LENGTH ought to say so (but doesn't, currently -- it will in
> the future).
> If the size were to change in the future (there are no plans to do so),
> then 1024 would be the minimum.
>
> Peter Relson
> z/OS Core Technology Design
>

When is this area obtained and freed? I.e. is this area unique for each
invocation of IEFU86, or unique for each individual record, or "global".
I'm wondering if I can put something in it on one invocation of IEFU86 and
access it in a different invocation.

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