RE: Memory Allocation Question

["Smith, Nelson" <NSmith@xxxxxxxxxxx>]

Thanks for your help, Barbara, Scott, Jon.  I've now got everything stripped
all the way down to no memory management at all (maximum sizes defined on
the d-specs) and everything works fine.  So I'll have to start adding things
back in one at a time to try to determine where the problem is.

> -----Original Message-----
> From: Barbara Morris [SMTP:bmorris@ca.ibm.com]
> Sent: Friday, January 03, 2003 11:59 AM
> To:   rpg400-l@midrange.com
> Subject:      Re: Memory Allocation Question
>
> Nelson, the pointer you get points somewhere within some huge heap of
> storage.  You physically actually have access to everything in the heap
> following your storage.  The debugger doesn't know how much you
> allocated, so it shows everything it physically can.
> (Try eval arr(1..40) to limit the number of elements shown by the
> debugger.)
>
> If the pointer itself has been corrupted, the debugger will display it
> as SPP:*NULL.
>
> The only thing I can think of is that you have reallocated the DS but
> that you still have access to the original allocated pointer.  That
> original pointer will still be pointing into valid storage in the heap,
> but it won't actually be allocated to you any more.
>
>     p = %alloc(100);
>     p2 = realloc(p : 200);
>
> After the realloc, trying to deallocate or reallocate p will result in
> an error.  But p will still look good, and although any reference to the
> storage pointed to by p is illegal, you will not get an error for doing
> it.  At least you won't get an error right away, but bad things could
> happen eventually if the original p storage gets allocated somewhere
> else.
>
>


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