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doc: Add introduction and credits to ubik.txt

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Credit where it's due. And the remainder of the introduction may
provide some useful context too.

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doc/txt/ubik.txt
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This file contains a threading analysis of Ubik prepared by
Jeffrey Hutzelman and sent ot the openafs-devel@openafs.org
Jeffrey Hutzelman and sent to the openafs-devel@openafs.org
mailing list in February 2011, archived at:
https://lists.openafs.org/pipermail/openafs-devel/2011-February/018329.html
A while ago, Jeff Altman asked me to do an analysis of the Ubik code with
repsect to threading, to try to determine how ready the code is to be moved
from an LWP-based environment to one using preemptive POSIX threads, and
what it will take to get it the rest of the way there. Now that the work
is complete, I'm posting the complete analysis and my recommendations for
discussion and as a backdrop for changes I expect to see proposed in the
near future.
This work was funded by Your File System, Inc.
-- Jeff
INTRODUCTION
This document describes the structure of Ubik, with an eye toward