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2009-06-23T21:43:02.988152Z
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Improve my last commit: use a separate condvar to serialize.

The advantage of using a separate condvar is that we can just use
cv_signal(9) instead of cv_broadcast(9). It makes no sense to wake up
multiple threads. It also makes the TTY code easier to understand.
t_dcdwait sounds totally unrelated.

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