RE: ILE C question. Access to System Heap instead of Fast Heap

["Smith, Graham (EBM)" <Graham_SmithEBM@xxxxxxxxxxx>]

Alexei, and also Phil Hall,

thanks for the advice.  

The TERRASPACE parm works a treat - especially when you remember to
physically set *TSIFC which isn't the default on the command setting. Duh!

Happy Holidays
Regards
Graham

> ----------
> From:         Alexei Pytel[SMTP:pytel@us.ibm.com]
> Sent:         27 December 2000 17:40
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: ILE C question. Access to System Heap instead of Fast
> Heap
> 
> 
> All heap support used to be limited to 16meg maximum allocation.
> In V4R4 (it could be V4R5 - I am not sure) a new teraspace support was
> introduced, which can handle much larger allocations.
> Check compiler documentation in AS/400 information center.
> 
> Quote from the book "ILE C for AS/400 Programmer's Guide" - Version 4
> Document Number SC09-2712-01 Part Number 24L2113 Program Number 5769-CX2:
> 
>      2. Objects built with TERASPACE(*YES *TSIFC) will allocate dynamic
> storage from
>          teraspace. Teraspace allocation routines do not use the
> _HEAP_SIZE
> macro.
> 
> Best regards
>     Alexei Pytel
> 
> 
> 
> "Smith, Graham (EBM)" <Graham_SmithEBM@heinz.co.uk>@midrange.com on
> 12/27/2000 08:41:19 AM
> 
> Please respond to MIDRANGE-L@midrange.com
> 
> Sent by:  owner-midrange-l@midrange.com
> 
> 
> To:   "'MIDRANGE-L@midrange.com'" <MIDRANGE-L@midrange.com>
> cc:
> Subject:  ILE C question. Access to System Heap instead of Fast Heap
> 
> 
> 
> Hi all,
> 
> Its my first posting to this list so treat me gently!
> 
> We're using ILE C based programs to interface with IBM's MQSeries product
> on
> an AS/400 at V4R4M0 os level..
> 
> We have a requirement to receive an approx 20MB MQ Message from a queue.
> 
> To that end our program attempts to allocate (using Calloc function) a
> portion of memory 20Mb in size.
> 
> The calloc fails to return a pointer which indicates that it couldn't
> allocate the memory.
> 
> I notice from the ILE C manuals (C/C++ Run Time Library Reference) that
> ILE
> 'C' programs usually make use of the "Fast Heap" which has a maximum size
> of
> 16 711 600 bytes.
> 
> Its possible (allegedly) to use System heap by setting the _HEAP_SIZE
> macro
> to _NO_DEFAULT_HEAP.  This should then give access to much more memory.
> 
> I've tried redefining _HEAP_SIZE  to _NO_DEFAULT_HEAP in my program before
> the first mallco/calloc with no sucess.
> I've also tried altering the STDLIB.H definition for _HEAP_SIZE from
> _C_heap_size to _NO_DEFAULT_HEAP.  Equally no success.
> 
> Any suggestions would be most useful.   I cannot claim to be an
> experienced
> 'C' programmer on any platform so plain and simple english explanations
> would be best.
> 
> Regards
> Graham Smith
> Graham_SmithEBM@Heinz.co.uk
> 
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