[Bug 209233] [patch] pthread_suspend_all_np races with check_suspend

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209233

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib at FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Lawrence Esswood from comment #0)

So the issue is that we might leave pthread_resume{_all}_np with the
THR_FLAG_SUSPENDED still set.  IMO this is the real bug, and it cannot be
worked around by trying to set NEED_SUSPEND in the next suspend cycle. 
Instead, resume functions should wait until the resumed thread is scheduled and
has a chance to run enough to clear the flag.

One more wait/wake point around thread->cycle would be needed to ensure of
proper control pass between resume->resumed->resume threads.

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