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Date:      Sun, 26 Jun 2016 19:28:11 +0300
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        Jilles Tjoelker <jilles@stack.nl>
Cc:        Daniel Eischen <deischen@freebsd.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r302194 - head/lib/libthr/thread
Message-ID:  <20160626162811.GD38613@kib.kiev.ua>
In-Reply-To: <20160625223338.GA22802@stack.nl>
References:  <201606251130.u5PBUeGC001988@repo.freebsd.org> <20160625171440.GA19698@stack.nl> <20160625172956.GE38613@kib.kiev.ua> <20160625223338.GA22802@stack.nl>

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On Sun, Jun 26, 2016 at 12:33:38AM +0200, Jilles Tjoelker wrote:
> To be bug-compatible with glibc, you'd need to return the wrong
> [EDEADLK] error for robust errorcheck mutexes only. Robust
> non-errorcheck and non-robust errorcheck mutexes return the correct
> [EBUSY]. I have not checked PI and PP mutexes which probably use a
> different code path.
Yes, you are right, I read the glibc code wrong way.

> I'm not sure whether we should copy glibc's bug, but if we do it must be
> documented in the man page. I'm not happy with it because the bug may
> break applications written to the standard; at least, Samba developers
> should be contacted first.

I tried to send the mail to samba tech list yesterday, but it did not pass.
Seems that today I managed it.

Still, it is pity that the only real-world consumer of the robust
interface cannot exercise our implementation due to this minor issue.



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