RE: RPG400-L Digest V2 #454

["Sims, Ken" <KSIMS@xxxxxxxxxxxxxxxx>]

Hi Barbara -

>Ken, what you say may be true of some system allocation 
>functions (I think the C runtime's realloc might work 
>this way), but not all, and not the one that RPG uses 
>under the covers.  First, RPG always returns a different 
>pointer from a successful REALLOC, and second, the storage
>isn't necessarily allocated in 4K chunks.  The program 
>below displays 32.

Oops, I was confusing the create and extension sizes of the heap as a whole
with the size of the allocation and reallocation.

> First, RPG always returns a different 
>pointer from a successful REALLOC,

Some testing confirms that is true, even when the storage always be extended
in place because the additional storage is within the 16-byte boundary
minimum.  Obviously the heap processing code could use some fine tuning.
(I'm assuming that the compiler is generating calls to heap storage
management, not managing the storage directly, so I'm not blaming you and
Hans. <G>)

>The program below displays 32.

Obviously the heap control storage is taken out of the heap itself,
accounting for the additional 16 bytes per allocation.

Ken
Southern Wine and Spirits of Nevada, Inc.
Opinions expressed are my own and do not necessarily represent the views of
my employer or anyone in their right mind.

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