K 10
svn:author
V 7
davidxu
K 8
svn:date
V 27
2006-12-03T01:49:22.000000Z
K 7
svn:log
V 223
Introduce userspace condition variable, since we have already POSIX
priority mutex implemented, it is the time to introduce this stuff,
now we can use umutex and ucond together to implement pthread's
condition wait/signal.

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