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From: potomacg AT nashville DOT net (Mike Jackson)
Newsgroups: comp.os.msdos.djgpp,rec.games.programmer
Subject: Re: Trapping access to memory...
Date: 19 Jul 1995 20:48:58 GMT
Organization: Telalink
Lines: 26
References: <3uivoo$kql AT kannews DOT ca DOT newbridge DOT com>
Reply-To: potomac2 AT nashville DOT net
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To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

In article <3uivoo$kql AT kannews DOT ca DOT newbridge DOT com>, woodward AT Newbridge DOT COM (Mark Woodward) says:
>
>
>I was wondering if anyone can point me in the right direction on this..
>What I want to do is trap access to a small chunk of memory. I'm currently
>doing it by a compare in the routine that writes to memory. About 90% of
>the accesses are straight read or writes, the other 10% require a 'side
>effect' after the read or write. I feel that doing the range check in the
>routine when 90% of the time it doesn't need it is pretty inefficient.
>So is it possible to set up an exception for the chunk I want the 'side affect'
>to be executed ala djgpp's vga page handler. 
>I looked at the src to go32 but I'm hoping I don't have to change anything in
>there.
>The docs for djgpp don't really help much, any other sources of info?
>
>Thanks,
>Mark
>
>-- 
> Mark C.R Woodward          woodward AT newbridge DOT com 
>
>Relax, Dont worry...  Load up Linux            Real computers dont run MS-DOS


Depending if this is in 386 mode (either protected or dos extender), then 
you can use Soft-ice or Soft-ice for WIndows.