From:	jlrubin AT bway DOT net (Josh Rubin)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: wanted: demand zero pages for uninitialized static data
Date:	Sat, 06 Jun 1998 03:15:04 GMT
Organization:	ISPNews http://ispnews.com
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References:	<35787c8c DOT 2850717 AT news1 DOT bway DOT net> <6la1c6$sac$1 AT rosenews DOT rose DOT hp DOT com>
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NNTP-Posting-Date:	6 Jun 1998 03:15:23 GMT
To:	djgpp AT delorie DOT com
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On Fri, 5 Jun 1998 17:09:44 -0700, "Andrew Crabtree"
<andrewc AT rosemail DOT rose DOT hp DOT com> wrote:

>>djgpp stub clears the "BSS" section. This causes a lot
>
>This is AFAIK required.  You always assume that an unitialized global is
>zeroed.
>

I didn't make my question clear enough.
In Dec VAX terminology, a "demand zero page" is an uncommited page
that is allocated and filled with zeroes the first time it is
referenced. I hoped that DPMI supported such a thing and all I had to
do was twiddle some page attribute bits somewhere.

If it were that simple, I was going to suggest that DJGPP do this by
default.

Josh Rubin
jlrubin AT bway DOT net

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