Re: ILE and activation groups

Basically your problem is that one of your still active programs (i.e one that has not set on LR) already has a pointer resolved to the service program procedures. Changing the library list will only cause a different Service Program to be activated if the program using it is in its initial state.

So Pgm A in AG X calls service program procedure Q in AG Y - on return Pgm A calls Pgm B also in AG X.

The stack collapses back to A again and then A calls a program to change the library list and do a RCL of AG Y.

A then calls procedure Q again and BOOM. There was nothing to cause A to resolved the Service Program again - it thinks it has a valid address.

This is obviously an over simplification but the basics are there. The "cure" is to make sure that A sets on LR and returns and gets called again whenever the library list is changed. There are more sophisticated options but they are usually a lot more work.

If you can describe your AG setup and call sequence more completely we can probably help more.


Jon Paris

On May 5, 2021, at 6:07 PM, Brian Garland via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

Background:

I'm working with a system that has service programs that run in a named
activation group.
We have multiple library lists for different environments (different sets
of test data in different libraries) and like to switch between them.
These library list changes could include the library that contains the
service programs.
The service programs use native I/O have an "open" procedure that opens the
files (among other things) and registers a "close" procedure (closes files)
with CEE4RAGE.

I'm working on some changes to this process and we now have a CL program to
manage the library list for us when we change environments. Part of that
CL is RCLACTGRP on that named activation group.

Problem:

I'm seeing the dreaded MCH3402 Tried to refer to all or part of an
object... after RCLACTGRP and changing the library list at the point the
first program in the call stack tries to call a procedure from one of the
service programs.

Do I have the concept wrong here? What could I be doing wrong?

Thanks in advance.



---
Brian J. Garland
Vermont Information Processing, Inc.
brian.garland@xxxxxxxxxx

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