Date: Sat, 26 Jul 1997 12:32:29 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: dyson@FreeBSD.ORG Cc: stesin@gu.net, hackers@FreeBSD.ORG Subject: Re: SVR4.2MP source code has become available recently? Message-ID: <199707261932.MAA02880@phaeton.artisoft.com> In-Reply-To: <199707252105.QAA00944@dyson.iquest.net> from "John S. Dyson" at Jul 25, 97 04:05:53 pm
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> > I've hear rumors that the source code for SCO UnixWare 2.1.x > > is now available from SCO for $500 for educational > > institutions. > > > > Isn't this interesting as a reference? How do you think? > > I have worked on the SVR4 codebase, and there isn't much > to be learned there. The Solaris stuff would be a little > bit more interesting. :-). The VM code is nearly identical, for what it's worth. It was part of the technology trade between Sun and USL. I believe the FS SMP locking in Solaris is actually done at the wrong level. The SVR4 ES/MP 4.0.2 based SMP code from Unisys did it the right way. The SVR4 code in UnixWare 2.x used the Sun model (with a bit fewer macro encapsulations; the Sun implementation is more aesthetically pleasing), which makes it hard to use SMP unsafe FS's on Solaris (making it a bugger to incrementally transition code). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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