Re: [C400-L] Re: Authentication / base64 encoder?

[Bruce Vining <bvining@xxxxxxxxxx>]

Change your array dimension to 500 and I suspect you'll see a failure
around the 257th allocation.  Each language runtime could handle storage
allocations in different manners, but I would expect most of them to fail
in the neighborhood of 4GB.

Bruce



                                                                                
                                                   
                      Mel Rothman                                               
                                                   
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Authentication / base64 encoder?                             
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                      08/29/2003 10:26                                          
                                                   
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Jon,

I don't know where RPG allocates storage from (you said "from the
default heap which has 1 16M limit"), but I just ran a test that
indicates RPG dynamic storage is not limited to only 1 16 megabyte
piece of storage.

Below is the code and it had no problems allocating 16,000,000 bytes
to each of 50 pointers.

Am I missing or misunderstanding something?

Did you mean to say 16M per pointer?

Mel Rothman
Mel Rothman, Inc.

D ptrs            s               *   dim(50)
D i               s             10i 0
C                   for       i = 1 to %elem(ptrs)
C                   alloc     16000000      ptrs(i)
C                   endfor
C                   eval      *inlr = *on



Jon Paris wrote:
>  >> But what I'd really like to know - is there any reason for OS/400 to
> return NULL after calling for example r = (char *) malloc(1000000) ;
>
> The major reason would be that you've exhausted the heap space (or at
least
> there no contiguous space of 1,000,000 bytes available).  I'm not certain
> about C, but RPG allocates form the default heap which has 1 16M limit.
> Unless you specify that the C code is to use terraspace capability then I
> suspect it has the same limit.  If you are using small amounts of memory
I
> wouldn't bother about it - if you're using 1,000,000 byte requests then
> probably safer to use the CEE APIs and create your own custom heap.
>
> Jon Paris
> Partner400
> www.Partner400.com
>
> _______________________________________________


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