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From: Frank Beythien <nospam_2015@efbe.prima.de>
Newsgroups: openwatcom.users.c_cpp
Subject: Re: Using function "_bheapseg" under OS/2 (use of high memory)
Date: Mon, 14 Dec 2015 09:51:36 +0100
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Xref: csiph.com openwatcom.users.c_cpp:3460

Am 14.12.2015 um 16:07 schrieb Steven Levine:
> On Mon, 14 Dec 2015 07:03:03 UTC, Lars Erdmann <lars.erdmann@arcor.de>
> wrote:
> 
> Hi Lars,
> 
>> how do you convert (under OS/2 and using high memory if possible) a 
>> based address (which _bmalloc returns) into a full 32-bit linear address ?
> 
> You don't.  _bmalloc is supported only by wcc.   Check the docs or the
> malloc.h #ifdefs.
> 
>> If all of this does not work under 32-bit OS/2, does anyone know any 
>> other functions in the Watcom RTL that would allow me to manage a heap 
>> in high memory ?
> 
> I implemented high memory support so that we could link the Mozilla 
> apps.
> 
> See malloc.h for:
> 
> #if defined(__OS2__) && defined(__386__)
> _WCRTLINK int _use_os2_high_mem( int fUseHighMem );	/* Returns prior 
> setting */
> _WCRTLINK void *_os2lmalloc( size_t amount );
> _WCRTLINK void *_os2hmalloc( size_t amount );
> #endif
> 
> It's on my list to update the runtime library docs.  That said, usage 
> is pretty straightforward.  _use_os2_high_mem sets the global 
> allocation strategy used by malloc and friends.  The default is low 
> memory only for backwards compatibility.  _os2lmalloc and _os2hmalloc 
> override the global strategy for the current call.
> 
> This all works similar to the gcc libc implementation.  However, there
> are no os2safe wrappers yet.
> 
> Of course you will need an OpenWatcom built from the current depot 
> sources to use these functions.

You can try http://efbe.musca.uberspace.de for an OS/2 build from
current perforce data.

> 
> Have fun,
> 
> Steven

CU/2
Frank