From:	"Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Compiling Quake
Date:	Wed, 15 Aug 2001 20:48:11
Organization:	Aspen Technology, Inc.
Lines:	13
Message-ID:	<3b7ae00b.sandmann@clio.rice.edu>
References:	<3B7AC29A DOT 9080305 AT edu DOT stadia DOT fi>
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> I just tried and it compiles with GCC 3.0. You WILL get crashes when you 
> run it, anybody want to explain that ugly memory management stuff?

I haven't looked at the source but I helped them build it.  What do you
want to know about the memory management?

The release was built with DJGPP V2.0 beta 3 pre-release, which only had
unixy sbrk() at the time (which is now not the default).  To make the
unixy sbrk() be non-moving extra memory was allocated (to DPMI commit it)
and then a negative sbrk() sent to leave extra for various libc usages.

Then there was the locking stuff to get around W95 DPMI lies and 
strangeness on DMA buffers.

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