Re: Waking up all threads waiting in kevent

To: Christof Meerwald <cmeerw%cmeerw.org@localhost>
Subject: Re: Waking up all threads waiting in kevent
From: Taylor R Campbell <campbell+netbsd-tech-userlevel%mumble.net@localhost>
Date: Sun, 26 Jul 2015 17:58:04 +0000

   Date: Sat, 25 Jul 2015 18:23:52 +0200
   From: Christof Meerwald <cmeerw%cmeerw.org@localhost>

   Is there a problem in my test case, is it a kernel bug or an
   ODROID-C1/ARM specific issue? Any ideas?

I can reproduce it in netbsd-6 on x86, once every four trials or so
with 16 threads.  Sounds like a race leading to a missing wakeup
somewhere in kqueue.  Can't reproduce it with poll instead of kqueue.
Can you please file a PR?

References:
- Waking up all threads waiting in kevent
  - From: Christof Meerwald

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