K 10
svn:author
V 6
badger
K 8
svn:date
V 27
2016-08-15T20:09:09.233600Z
K 7
svn:log
V 691
sem_post(): wake up the sleeper only after adjusting has_waiters

If the caller of sem_post() wakes up a thread sleeping via sem_wait()
before it clears the has_waiters flag, the caller of sem_wait() has no way of
knowing when it is safe to destroy the semaphore and reuse the memory. This is
because the caller of sem_post() may be interrupted between the wake step and
the clearing of has_waiters. It will then write into the has_waiters flag in
userspace after being preempted for some unknown amount of time.

Reviewed by:	jhb, kib, vangyzen
Approved by:	kib (mentor), vangyzen (mentor)
MFC after:	2 weeks
Sponsored by:	Dell Inc.
Differential Revision:	https://reviews.freebsd.org/D7505

END