Threads. Again. Dammit.

[Dan Sugalski]

Okay, it's obvious that we still have some issues to work out before
we hit implementation details. (Hey, it could be worse--this is easy
compared to strings...) I think there are some ways we can minimize
locking, and I think we have some unpleasant potential issues to deal
with in the interaction between strings and threads (I thought we
could dodge that, but, well... I was wrong).

This needs more thought and more work before we go anywhere. Some of
the obvious stuff, like fixing up the cache slot of the PMC, should
be done regardless.

I also think we need more real-worldish tests for this, so we can see
if the problems really are as bad as they seem. That, at least, I
think I can help with, since I conveniently happen to have a compiler
that targets parrot near-done enough to test some reasonably abusive
HLL(ish) code to see what sort of hit we take.
--
Dan

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