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

Duane,
I could add an output parameter to the stored procedure to return that
number, that wouldn't be an issue, but its not really important to the
matter at hand. The calling program loops through the result set 100
records at a time until there aren't any left. The maximum number of
results that can be return in this instance is 400 (due to the number and
size of the fields being returned in each record). I will look into the
memset function and see if that is an easy way to initialize the memory as
opposed to looping through each element.


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



"Christen, Duane" <Duane.Christen@xxxxxxxxxx>
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10/28/2010 11:05 AM
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RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>


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






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


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Duane Christen
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Duane.Christen@xxxxxxxxxx

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


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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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