[Bug nptl/13701] pthread_rwlock_rdlock & realtime scheduling writer lock precedence

["triegel at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=13701

--- Comment #7 from Torvald Riegel <triegel at redhat dot com> ---
(In reply to Bruno Haible from comment #5)
> By the way, there's also the bug that PTHREAD_RWLOCK_PREFER_WRITER_NP does
> not behave like one would intuitively except: it still prefers readers. See
> the BUGS section of
> http://man7.org/linux/man-pages/man3/pthread_rwlockattr_setkind_np.3.html.
> (I checked the glibc code: the man page is right.)

I have built a new, more scalable rwlock last year that should be committed
soon and that supports this mode (though there's not a lot the implementation
can do because of recursive rdlocks being allowed -- and we're certainly not
going to track which reader exactly has acquired a particular rdlock).

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