Re: Storage allocation for aligned structures

[Jon Paris <Jon.Paris@xxxxxxxxxxxxxx>]

On 6-Jun-08, at 5:40 PM, rpg400-l-request@xxxxxxxxxxxx wrote:

> I am concerned that if I use the %size value when allocating storage
> that I am not giving sufficient space to the structure which could
> cause issues with corrupted memory.   Should I be allocating 656 to
> each element of myds or 644?
>
> Thanks for any comments on this question.
>
> -Paul
>
>      D myds            ds                  likeds(regex_t)
>      D                                     dim(64)
>      D                                     based(pMyds)

Given that you are not really using that much storage, I'm not sure  
why you are bothering with dynamic memory.  That said - you _must_  
allocate in multiples of 656.  That is how big each element is  
because there is a pad of 12 bytes required at the end of each  
element in order to align the following element.

You should still be able to use %Size to calculate your requirements  
like so: actualSize = ( %Size(arrayname: *all) / %Elem(arrayname) )

Jon Paris

www.Partner400.com
www.SystemiDeveloper.com