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- Newsgroups: comp.arch
- Path: sparky!uunet!think.com!paperboy.osf.org!meissner
- From: meissner@osf.org (Michael Meissner)
- Subject: Re: Any new instructions in a i486?
- In-Reply-To: finger@convex.com's message of Tue, 15 Dec 1992 15:54:25 GMT
- Message-ID: <MEISSNER.92Dec17110628@tiktok.osf.org>
- Sender: news@osf.org (USENET News System)
- Organization: Open Software Foundation
- References: <edm.724366309@wrs.com> <1992Dec15.014650.24209@grebyn.com>
- <1992Dec15.042513.23969@gandalf.ca> <1992Dec15.155425.25217@convex.com>
- Date: 17 Dec 92 11:06:28
- Lines: 20
-
- In article <1992Dec15.155425.25217@convex.com> finger@convex.com (Jay Finger) writes:
-
- | In article <1992Dec15.042513.23969@gandalf.ca> dperks@gandalf.ca (Dave Perks) writes:
- | >Is it also possible that since the Intel 486 supports supervisor-mode write
- | >protection, it is is used to allow something like copy-on-write? If NeXT Step
- | >was designed to use this then the kernel would require fairly major changes.
- |
- | Yep, NeXTstep (and maybe Mach in general, somebody correct me if I'm wrong)
- | uses copy-on-write all over the place. The programmers' references
- | mention copy-on-write in many places (at least the 2.x documentation does,
- | but that's for a 680[34]0).
-
- While I can't say anything about NeXT's implementation, I am posting
- this article from a 386 (not a 486) running OSF/1, which is based on
- Mach, and uses copy-on-write all over the place.
- --
- Michael Meissner email: meissner@osf.org phone: 617-621-8861
- Open Software Foundation, 11 Cambridge Center, Cambridge, MA, 02142
-
- You are in a twisty little passage of standards, all conflicting.
-