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  2. RPG400-L
  3. December 2013

Re: Need some ammunition (Procedures vs. Sub-routines)

A couple of things on the "leave well enough alone" side:

1. It's entirely possible that (perhaps without anybody realizing it) a program might very well *depend* on side effects of a subroutine playing around with global variables, and if one switches to local variables, eliminating the side effects, one could break whatever depends on them. I've seen it happen. Usually the tipoff for something dependent on a side effect is when it works even though it looks like it shouldn't.

2. Remember: when you have OPM and ILE calling each other across activation groups, you have an "impedance bump," but when you have ILE actually doing ILE things (like procedure calls) in the OPM activation group (usually only when it's set to run in CALLER, and is then called from an OPM program), you can end up with erratic behavior. (I try to avoid situations like that on anything I let out of the building.)

--
JHHL

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