Microsoft C - Heap space question

[Christopher D. Brown]

In article <3631 at cbnewsh.ATT.COM> jmn at cbnewsh.ATT.COM (john.b.medamana) writes:
>Is it possible to get a separate physical segment (Group?) 
>for heap?   I am using the Microsoft C large memory model.
>The default allocation combines stack and heap into a 
>single 64K segment (DGROUP).  Is there a way to get a
>separate segment for heap?
>
>I'm using Microsoft C 5.1 and Microsoft LINK.

MSC 5.1 _fmalloc, which is the large model malloc, allocates new, far
memory until all (MS-DOS) available memory has been allocated;  At this
point _fmalloc calls _nmalloc as a last resort.  Thus, ordinarily,
allocation is not from DGROUP.  Note that DGROUP is at the end of
the load and can be extended by _nmalloc ONLY if the memory above
it has not been allocated via _fmalloc, halloc, or direct calls to
the MS-DOS memory allocation primatives.

The library routines halloc and hfree may be of interest.  They map
directly to the MSDOS memory allocation primatives.

Chris Brown
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