Re: More on global declarations in RPG IV

[Alan Campin <alan0307d@xxxxxxxxx>]

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
>
>
>
> --
> This is the RPG programming on the IBM i / System i (RPG400-L) mailing list
> To post a message email: RPG400-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
> or email: RPG400-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/rpg400-l.