[Bug 198216] According to man page for pthread_cond_destroy it returns EBUSY error code, but it never does

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198216

John Baldwin <jhb at FreeBSD.org> changed:

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

--- Comment #1 from John Baldwin <jhb at FreeBSD.org> ---
Adding Konstantin to see what he thinks.

First, the manpage should not say "locked" as you don't lock a condition
variable (this appears to be copied from the pthread_mutex_destroy manpage and
just not updated after it was copied).  If it's going to fail with EBUSY it
should be because there are threads blocked on the cv via pthread_cond_*wait().

Looking at the umtx bits, I think it would not be too hard to add a check that
checked _has_user_waiters and __has_kern_waiters and failed with EBUSY if
either were non-zero.  The Open Group lists EBUSY as an optional check, but
given that it should be cheap to do I would not be opposed to adding it (and
also fixing the manpage to not say "locked").

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