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

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

Sorry... with my prior message I had not finished.

The statement about %Alloc not having an initialization parameter is valid.
However, it implies that you cannot do in RPG what you can do in C. Simply
prototype the malloc or calloc function in your RPG application, and call it
like anything else.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"Don't let life discourage you; everyone who got where he is had to begin
where he was."
-- Richard L. Evans



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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