Re: More on global declarations in RPG IV

Global just means static storage. It never goes away.

An interesting question that maybe Barbara can answer is when does the
static storage go away when a program using the main keyword ends.

I know that static storage does not go away when a program using the main
keyword ends. LR has no meaning. It still is out there. I tried a test
program and determined that if you call a program with a global variable and
initialize to some value and end the program, if you go back in to the
program the storage is still set at the previous value. It does not reset or
destroy it.

So the question becomes when does the storage get released?

On Thu, Nov 11, 2010 at 9:21 AM, Nathan Andelin <nandelin@xxxxxxxxx> wrote:

I'll throw out a suggestion just for terminology sake. I prefer to call
module-level declarations, "module-level declarations", as opposed to
"procedure-level declarations", and rather than "global declarations". To
me a
global declaration would be something that might be shared across an entire
activation group, which might include any number of programs and service
programs in a call stack. Say you export a data structure from a service
program, for example, which is intended to be shared across an entire
activation
group. That's a lot more global than "module-level" declarations.

-Nathan.



----- Original Message ----
From: Vern Hamberg <vhamberg@xxxxxxxxxxx>
To: RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>
Sent: Thu, November 11, 2010 8:46:08 AM
Subject: More on global declarations in RPG IV

In a recent thread, there was some question about global variables,
etc., when using the MAIN control keyword. I had mentioned that some
things still must be global. I believe that one of them is compile-time
arrays. If you want to find all the messages that deal with "global",
here's a way to do that -

Execute the following command -

DSPMSGD RANGE(*ALL) MSGF(QDEVTOOLS/QRPGLEMSG) DETAIL(*FULL) OUTPUT(*PRINT)

Then you can search for 'lobal' in the spooled file - this covers
possible upper- or lower-case "G" in the word "global"

So have fun. And I did find, in the RPG ILE Reference, this note about
CTDATA, footnote 2

This keyword applies only to global definitions.

Random musings while on vacation! I know, I'm rubbing it in!
Vern



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