pre-LilleHammer mailing deadline

[Bill Pugh]

I made a few more tweaks after incorporating Ben's changes.

The main thing I changed was that the document had said that data races
can introduce non-determinism. Actually, threads introduce 
non-determinism,
and plenty of correctly synchronized multithreaded programs are 
nondeterministic.

So I changed the wording to spell out why data races are bad:
Constructing a program that exhibits data races
and is guaranteed to work correctly in spite of reorderings allowed by 
the
memory system and by the compiler is very difficult, and
data races are usually an indication
of a programming error.

	Bill

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