[Bug 234805] pthread_*_destroy doesn't handle locked objects consistently

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Fri Jan 11 15:53:41 UTC 2019


--- Comment #2 from Mark Johnston <markj at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #1)
Sorry, can you explain why a new umtx op is needed?  Can't the ucond's
c_has_waiters field be used to determine whether threads are blocked in the
kernel?  Certainly this is racy if the thread calling pthread_cond_destroy()
does not hold the associated mutex, but I can't see the need for a new umtx op.

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