ISPF 3.4 edit of a ps file, disp used in dynamic allocation

Carrie Da Silva · New User Joined: 16 Nov 2017 Posts: 2 Location: USA

Hello! I did a search for this question, but did not see an answer. So, I apologize in advance if it has been answered already and I did not find it. We have an exit into dynamic allocation. When I do an edit of a PS file in ispf 3.4, I see the allocation as disp=shr first then a follow on allocation of disp=old for the same data set. Is this normal? How does this affect enq processing?

Thanks in advance for any knowledge of how this processing works.
Carrie

steve-myers · Posted: Fri Sep 21, 2018 3:37 am

As far as ISPF goes, your observation is not correct.

When you edit an existing sequential data set ISPF allocates the data set with exclusive control; it stays that way until you exit from the edit session.

Carrie Da Silva · New User Joined: 16 Nov 2017 Posts: 2 Location: USA

Steve,
Thank you for the reply. We have an exit in dynamic allocation and I can see two distinct different calls (very close together) for this ps dataset. The first has a text unit of disp=shr and the second has disp=old. I discussed this with a developer in allocation who saw the same behavior. There must be a reason for this, maybe to see if it is actually even possible to edit the file at this time.

Pedro · Posted: Tue Sep 25, 2018 11:53 pm

I think you have to ask IBM about their design choices. The people here are users of ISPF, but do not have access to IBM source code to see what is actually being done.