Re: When does manually allocated memory get released? -- RPG400-L

Bryce

See what you think of this. I don't like trusting a mechanism to clean up after me. I think it's preferable to deallocate memory myself, no matter what.

So this is an opportunity for using the monitor|endmon processing. You could wrap it around a front-end driver, for example, or pick suitable places to put it. But in any case, put a dealloc(e) in the on-error section, and maybe an eval to null of the pointer or pointers. This'd clean things up under you control always, and it'd not worry if the pointer is NULL. You can also test the pointer for NULL, I suppose.

Eh?
Vern

On 10/8/2010 7:21 AM, Bryce Martin wrote:

Scott and company,
Thank you all for verifying my understanding of how it works. I do plan
on doing the %dealloc myself, I was just wondering for the sake of testing
purposes before I have all my safe guards in place. I'm doing some proof
of concept stuff right now so I didn't really want to worry about trying
to catch every array index or decimal data error. If the program bombs
the AG will be destroyed, if it ends normally then the %dealloc will
happen. So I'm safe, me thinks :)

Thanks
Bryce Martin
Programmer/Analyst I
570-546-4777

"Schmidt, Mihael"<Mihael.Schmidt@xxxxxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
10/08/2010 03:48 AM
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RPG programming on the IBM i / System i<rpg400-l@xxxxxxxxxxxx>

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Subject
RE: When does manually allocated memory get released?

End of ACTGRP or end of job will also free any allocated heap storage as
heap storage is an activation group-level resource.

Mihael

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of dieter.bender@xxxxxxxxxxxx
Sent: Friday, October 08, 2010 8:08 AM
To: RPG programming on the IBM i / System i
Subject: Re: When does manually allocated memory get released?

good practice would be to release the memory by your own, to avoid to
shrink
the heap space. End of ACTGRP will destroy all pointers in your static
allocated storage, but I would suspect, that there is no "garbage
collector"
to reclaim the heap storage.

D*B

--------------------------------------------------
From: "Bryce Martin"<BMartin@xxxxxxxxxxxx>
Sent: Thursday, October 07, 2010 10:02 PM
To: "RPG programming on the IBM i / System i"<rpg400-l@xxxxxxxxxxxx>
Subject: When does manually allocated memory get released?

List Experts...
I'm currently using a pointer based array and manually
allocating/reallocating space for the array. This program runs in a

named

activation group. If I don't manually deallocate (maybe due to an
uncaught error), does the memory get release when the AG is destroyed or
when the job ends? I'm guessing its when the AG is destroyed, but I'd
like to make sure.

Thanks
Bryce Martin
Programmer/Analyst I
570-546-4777
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