Re: Memory Leaks in RPG (was: Is RPG 'DEAD")

[Tommy.Holden@xxxxxxxxxxxxxxxxxxxxx]

IIRC you have to *specify* how much memory to deallocate/reallocate.

Thanks,
Tommy Holden


From:
"Rory Hewitt" <roryhewitt@xxxxxxxxx>
To:
"RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
Date:
06/19/2008 04:20 PM
Subject:
Re: Memory Leaks in RPG (was: Is RPG 'DEAD")



Jerry,

Basically, the length of allocated space is held separately from the 
pointer
itself - you have to pass this information around. Although maybe Bruce 
can
tell us how, when you use DEALLOC, it knows how much space was previously
allocated (and therefore, how much to reallocate)...

On Thu, Jun 19, 2008 at 2:09 PM, Jerry Adams <Jerry@xxxxxxxxxxxxxxx> 
wrote:

> Like David, I'm learning a lot from these emails (just a lot more 
slowly).
> A pointer is, as stated, just an address.  But it's just the starting
> address, right?  Which, if I understand Bruce's example and David's 
concern
> correctly, means that PgmA could pass PgmB an address to a parm.  But 
this
> pointer/address wouldn't have any clue how long that parm is, right? 
I.e.,
> if PgmA intended for PgmB to use, say, ten bytes it would have to pass 
that
> bit of trivia with the pointer.  But, if PgmB decided to use twenty 
bytes
> starting at the passed address, it could.  Or is the length of the 
address
> space to be used inherent in the pointer itself?
>
> Jerry C. Adams
> IBM System i Programmer/Analyst
> B&W Wholesale
> office: 615-995-7024
> email:  jerry@xxxxxxxxxxxxxxx