Date: Fri, 20 Feb 2004 09:46:03 -0800 (PST) From: Doug White <dwhite@gumbysoft.com> To: Doug Rabson <dfr@nlsystems.com> Cc: freebsd-arch@freebsd.org Subject: Re: Read Copy Update Message-ID: <20040220094342.W60703@carver.gumbysoft.com> In-Reply-To: <1077208338.9856.1.camel@builder02.qubesoft.com> References: <1077137806.28133.10.camel@herring.nlsystems.com> <1077208338.9856.1.camel@builder02.qubesoft.com>
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On Thu, 19 Feb 2004, Doug Rabson wrote: > On Thu, 2004-02-19 at 16:26, Peter A Jonsson wrote: > > > I imagine that a FreeBSD implementation of RCU wouldn't actually be too > > > hard and it might be well worth it as an alternative way of managing > > > concurrency, e.g. for the routing cache and the name cache (and probably > > > lots of other things). > > > > Alan Cox pointed out[1] that there was a patent problem (US Patent > > #05442758 [2]) with RCU which prevented inclusion in the Linux > > kernel. This was solved[3] by granting the right to use it in GPL > > software according to my understanding. Isn't this a problem for > > FreeBSD? > > That would be a problem unless the patent owner (Sequent, i.e. IBM) > could be encouraged to grant a similar license for BSD software. Note that SCO is trying to claim that RCU is derviative of SysV, so it might be a good idea to steer clear of this until that issue is resolved... which might be a while. :) -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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