K 10
svn:author
V 2
ed
K 8
svn:date
V 27
2009-06-23T21:33:26.814868Z
K 7
svn:log
V 275
Use dcdwait to block threads to serialize writes.

I suspect the usage of bgwait causes a lot of spurious wakeups when
threads are blocked in the background, because they will be woken up
each time a write() call is performed.

Also wakeup dcdwait when the TTY is abandoned.

END