Date: 19 Feb 2004 16:32:18 +0000 From: Doug Rabson <dfr@nlsystems.com> To: Peter A Jonsson <pj@ludd.ltu.se> Cc: freebsd-arch@freebsd.org Subject: Re: Read Copy Update Message-ID: <1077208338.9856.1.camel@builder02.qubesoft.com> In-Reply-To: <xcl4qtnc9xs.fsf@dexter.ludd.ltu.se> References: <1077137806.28133.10.camel@herring.nlsystems.com> <xcl4qtnc9xs.fsf@dexter.ludd.ltu.se>
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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.
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