K 10
svn:author
V 7
davidxu
K 8
svn:date
V 27
2010-11-22T02:42:02.777901Z
K 7
svn:log
V 148
Use atomic instruction to set _has_writer, otherwise there is a race
causes userland to not wake up a thread sleeping in kernel.

MFC after: 3 days

END