From: sandmann AT clio DOT rice DOT edu (Charles Sandmann)
Message-Id: <9612030314.AA12943@clio.rice.edu>
Subject: Re: Problem raising exceptions in tight loops
To: grendel AT ananke DOT amu DOT edu DOT pl
Date: Mon, 2 Dec 1996 21:14:52 -0600 (CST)
Cc: djgpp AT delorie DOT com
In-Reply-To: <32A373A3.6C6@ananke.amu.edu.pl> from "Mark Habersack" at Dec 3, 96 01:26:11 am
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> I was thinking about using a TSS as a source of information about
> CS:EIP. Wouldn't it be possible to store a pointer to the last tasks's
> TSS in some place accessible for the HW handler, and then take all the
> data you need from the TSS? In a non-multitasking environment like DOS
> it should be quite possible.

Under DOS you can run with a ring 0 dpmi provider (cwsdpr0/pmode) in
which case you don't swap stacks and do whatever you want.  But you can't
make windows easily do what you want, thus many features won't work at
all under Windows/OS2/NT/etc and you end up with the V1.x problem:
certain things don't work under DPMI.

The standard libc stuff only depends on the DPMI spec, and nothing else.