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Date:      Fri, 20 Feb 1998 09:21:16 -0000
From:      Duncan Barclay <dmlb@symbionics.co.uk>
To:        "'dg@root.com'" <dg@root.com>
Cc:        "'chat@freebsd.org'" <chat@FreeBSD.ORG>
Subject:   RE: pre-emptive multitasking patent!
Message-ID:  <c=GB%a=_%p=Symbionics%l=SYMNT3-980220092116Z-7465@symnt3.symbionics.co.uk>

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>
>   Actually, that article mentions pre-emptive multithreading, which FreeBSD
>doesn't currently support in the kernel. This might be an issue if we go
>beyond the single giant lock model in SMP, however. I haven't read the
>patent, but it shouldn't be difficult to prove prior art.
>
>   -DG
>
>David Greenman
>
I had a look at the patent a couple of days ago. It's a bit odd in that
he
seems to be shooting himself in the foot re-prior art by citing papers
back to 1972 by CAR Hoare and a few bits in the 70's.
>
>Duncan
>
>PS. if the formatting is crap sorry; at work with M$ Exchange.

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