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Mail Archives: djgpp/2001/07/26/12:30:05

From: "Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Pharlap 286
Date: Thu, 26 Jul 2001 10:39:12
Organization: Aspen Technology, Inc.
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Message-ID: <3b5ff350.sandmann@clio.rice.edu>
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Thread: Frames, NoFrames, TwoWindows

> There might be one way out of this, although it's not very nice: page
> the DPMI client completely out of extended memory, either
> automatically whenever it spawns another program, or (better) when the
> spawned program requests memory via the XMS API.

I dislike the paging out of all memory - it really hurts performance on
the 99% of applications that don't need it.

It has been suggested before to have CWSDPMI hook XMS calls when it loads
to provide some support - this would make DMA buffers easier, allow 
nesting programs, etc.  But doing a partial XMS is a can of worms.  Doing
a full XMS is re-inventing the wheel.  Just paging out the memory, releasing
it on XMS call - what happens if application calls XMS inside a DPMI
program (not spawned? - difficult to tell when they use a real mode 
far call what's happening).  I'd still argue this is mostly a 
non-problem in the real world.  Let's get DJGPP stable on W2K and
XP first :-)

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