RE: Sharing Global Variables between Modules

Vern,
I understand I would not have to pass a global variable to
procedures contained in the same module.
These are calls between procedures in different modules. The
variable is declared in both modules as global.

These are not shared when both modules are bound into a
program...Correct?



-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of vhamberg@xxxxxxxxxxx
Sent: Friday, June 20, 2008 2:57 PM
To: RPG programming on the AS400 / iSeries
Subject: Re: Sharing Global Variables between Modules

If they are global, anything you change in one procedure changes it when
used in any other procedure - so just forget about passing it.

Now you should be sure you have no undesired side effects - and passing
as a parameter IS desirable.

Passing as a pointer - that is the same as it being global - you are
changing values at a memory location - and that is the same everywhere,
too. Bad idea - I think several have said not to do that on this list.

HTH
Vern

-------------- Original message --------------
From: "Coyle, Stephen F."

Hi All,
I have 2 modules in a program. Each one /copies in a standard
3rd party data structure definition and it is not qualified. The DS is

global in each module. Each module can update the DS. I need to pass
this DS between modules and have any updates reflected in the calling
module.

Here is an example with I00SC as the global variable.
CALLER:
P5992101V1_AskEnv( Rec:I00SC) ;

CALLEE:
P P5992101V1_AskEnv...
P B export
D P5992101V1_AskEnv...
D PI
D Rec likeds(F5992101_t)
D XI00SC Likeds(I00SC)
/free
I00SC = XI00SC ; // initialize DS
....MODIFY I00SC HERE
XI00SC = I00SC ; // populate return DS
Return ;

There must be a better way than that. Passing a pointer around maybe?
An example would be appreciated.

Thanks...
- Steve



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