From: alaric AT abwillms DOT demon DOT co DOT uk (Alaric B. Williams)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problem raising exceptions in tight loops
Date: Sat, 30 Nov 1996 13:34:04 GMT
Lines: 23
Message-ID: <849360845.357.2@abwillms.demon.co.uk>
References: <199611290438 DOT RAA23487 AT papaioea DOT manawatu DOT gen DOT nz>
NNTP-Posting-Host: abwillms.demon.co.uk
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

"Malcolm Taylor" <malcolm AT manawatu DOT gen DOT nz> wrote:

>The explanation is that HW ints cause the limit of ds to be lowered, 
>thereby causing a page fault the next time the ds is accessed. This 
>page fault is what causes the exception to be handled. In your tight 
>loops you are not accessing the ds, hence no exception.

Hey, O libc porting people, why not lower cs instead?


ABW
--

"Simply drag your mother in law's cellphone number from the
Address Book to the Laser Satellite icon, and the Targeting
Wizard will locate her. Then follow the onscreen prompts for
gigawattage and dispersion pattern..."

(Windows for Early Warning and Defence User's manual P385)

Alaric B. Williams Internet : alaric AT abwillms DOT demon DOT co DOT uk
<A HREF="http://www.abwillms.demon.co.uk/">Hello :-)</A>