From owner-freebsd-current@FreeBSD.ORG Fri Aug 6 18:50:14 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CEA7216A4CF for ; Fri, 6 Aug 2004 18:50:14 +0000 (GMT) Received: from khavrinen.lcs.mit.edu (khavrinen.lcs.mit.edu [128.30.28.20]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7EEFA43D62 for ; Fri, 6 Aug 2004 18:50:14 +0000 (GMT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: from khavrinen.lcs.mit.edu (localhost [IPv6:::1]) by khavrinen.lcs.mit.edu (8.12.9/8.12.9) with ESMTP id i76IoC8g018011 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK CN=khavrinen.lcs.mit.edu issuer=SSL+20Client+20CA); Fri, 6 Aug 2004 14:50:13 -0400 (EDT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: (from wollman@localhost) by khavrinen.lcs.mit.edu (8.12.9/8.12.9/Submit) id i76IoCgJ018008; Fri, 6 Aug 2004 14:50:12 -0400 (EDT) (envelope-from wollman) Date: Fri, 6 Aug 2004 14:50:12 -0400 (EDT) From: Garrett Wollman Message-Id: <200408061850.i76IoCgJ018008@khavrinen.lcs.mit.edu> To: Ville-Pertti Keinonen In-Reply-To: <41134185.1090105@will.iki.fi> References: <20040805050422.GA41201@cat.robbins.dropbear.id.au> <200408051759.53079.jhb@FreeBSD.org> <4112B184.8010303@samsco.org> <20040806023055.GC20148@empiric.icir.org> <41134185.1090105@will.iki.fi> X-Spam-Score: -19.8 () IN_REP_TO,QUOTED_EMAIL_TEXT,REFERENCES,REPLY_WITH_QUOTES X-Scanned-By: MIMEDefang 2.37 X-Mailman-Approved-At: Sat, 07 Aug 2004 12:04:29 +0000 cc: current@FreeBSD.org Subject: Re: Atomic operations on i386/amd64 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Aug 2004 18:50:15 -0000 < said: > The idea of using self-modification to select locking modes (although > for optional preemption, SMP and debugging rather than CPU model) is > also described in a DEC Technical Journal article: > http://research.compaq.com/wrl/DECarchives/DTJ/DTJF03/DTJF03SC.TXT There have been a number of research operating systems built around this concept. I seem to remember one called "Synthesis" which took it to an extreme. Calton Pu and Henry Massalin would appear to be the authors. -GAWollman