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  1.  Home
  2. RPG400-L
  3. October 2010

RE: Memory being reused by %alloc on second call to program.

Not sure about anyone else, but usually when I allocate memory, it's because
I want to base a data structure on it.

So, once I have the basing pointer set, I simply CLEAR MYDSNAME and voila!
Instant clearing, with the additional benefit that numerics are "cleared" to
the correct format, and alphas are blank.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"Don't knock the weather; nine tenths of the people couldn't start a
conversation if it didn't change once in a while."
-- Kin Hubbard


Bryce;

This is just my opinion, but your logic should be redesigned to track,
in this case, the number of records/array elements populated and return
that to the caller also.

Baring that, no a rclrsc won't help, even if this was an OPM program.
RPG's %Alloc or %ReAlloc does not have a "fill with" parameter, like C
does, so you have to initialize it yourself using the C memset function.
You could also use the C alloc/realloc functions instead of the RPG
bifs.

Duane Christen


--


Duane Christen
Senior Software Engineer
(319) 790-7162
Duane.Christen@xxxxxxxxxx

Visit PAETEC.COM


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-
bounces@xxxxxxxxxxxx] On Behalf Of Bryce Martin
Sent: Thursday, October 28, 2010 9:38 AM
To: RPG programming on the IBM i / System i
Subject: Re: Memory being reused by %alloc on second call to program.

I was wondering if I'd need to do that. What is the easiest/quickest
way to initialize the memory? Could I do a rclrsc upon returning to
the first screen in ProgramA? The StoredProc has *inlr=*on so I'm
guessing the RCLRSC won't do anything.


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



Charles Wilt <charles.wilt@xxxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
10/28/2010 10:20 AM
Please respond to
RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>


To
"RPG programming on the IBM i / System i" <rpg400-l@xxxxxxxxxxxx>
cc

Subject
Re: Memory being reused by %alloc on second call to program.






Working as designed...

In any language, you should always initialize newly allocated memory;
if you code depends on it.


Charles

On Thu, Oct 28, 2010 at 9:36 AM, Bryce Martin <BMartin@xxxxxxxxxxxx>
wrote:
I have written my first external stored procedure and it uses dynamic
memory allocation to create a couple of 2D arrays. The problem that
I'm
seeing is this...

ProgramA using CLI calls StoredProc. StoredProc
%alloc/%realloc/%dealloc
and uses a regular static array for returning a result set.

ProgramA is two screens. First screen has fields to search by. If I
enter criteria and hit enter ProgramA then calls StoredProc.
ProgramA
then processes the ResultSet and puts it into a subfile for viewing.
If
I
F12 back to the first screen and change my search criteria to
something
that shouldn't return results it still does but refined by whatever I
just
searched by. If I F3 out of ProgramA then all the memory used by the
StoredProc is released even if I don't do a RCLACTGRP of ProgramA's
activation group. If I search a second time after doing the full
exit
by
the criteria that should not return results then it works and returns
no
results. (no results could also be a search that is too generic to
have
good results, this is handled by the StoredProc).

In the StoredProc I am doing the following Destroy call, the
DestroyArray() procedure just take a pointer to an array memory
address
and does a dealloc(n) pWholeArray;

pArrayElem = *null;
DestroyArray(pWholeArray);
pWholeArray = *null;

I nulled the pointers for good measure but that didn't do anything.

It looks like the second call is doing an %alloc and starting at the
same
memory address as the previous call had done. So when I %alloc a
block
the memory already contains the data from the previous call. How do
I
handle this?

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