Re: Recursive calls in RPG ILE

Just be aware that to make it truly recursive you will have to create a new 
activation group each time the procedure is called. As I understand things, 
this takes a lot of resources. Has anyone bombed the system attempting to 
create too many activation groups.

Back in the late 80s, I was working at a site that had a cute little program 
that would allow you to make recursive calls.  It was a menu display.  I 
wondered how many times this could be executed before it bombed.  To my 
surprise, it stopped at 79. To my astonishment, the whole system halted. My 
face was bright red. When the CE came in he brought the system down correctly 
and it rebooted normally.  The error said that a system stack had overflowed. I 
had no idea.

This was in the days of OPM and S/38. When the guy installing the UPS clipped 
the wrong wire, it took this system 18 hours to recover. Those were the good 
old days???


Marvin

message: 4
date: Wed, 22 Mar 2006 14:30:07 -0800
from: "James H H Lampert" <jamesl@xxxxxxxxxxx>
subject: Re: Recursive calls in RPG ILE

Recursion in ILE RPG works well enough that you can write 
a recursive descent parser.

--
JHHL


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