From: Torvald Riegel <triegel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: "Michael Kerrisk (man-pages)"
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
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Rich Felker <dalias-8zAoT0mYgF4@public.gmane.org>
Subject: Re: futex(2) man page update help request
Date: Sat, 24 Jan 2015 14:12:22 +0100 [thread overview]
Message-ID: <1422105142.29655.16.camel@triegel.csb> (raw)
In-Reply-To: <alpine.DEB.2.11.1501241116160.5526@nanos>
On Sat, 2015-01-24 at 12:35 +0100, Thomas Gleixner wrote:
> So we should never see -EINTR in the case of a spurious wakeup here.
>
> But, here is the not so good news:
>
> I did some archaeology. The restart handling of futex_wait() got
> introduced in kernel 2.6.22, so anything older than that will have
> the spurious -EINTR issues.
>
> futex_wait_pi() always had the restart handling and glibc folks back
> then (2006) requested that it should never return -EINTR, so it
> unconditionally restarts the syscall whether a signal had been
> delivered or not.
>
> So kernels >= 2.6.22 should never return -EINTR spuriously. If that
> happens it's a bug and needs to be fixed.
Thanks for looking into this.
Michael, can you include the above in the documentation please? This is
useful for userspace code like glibc that expects a minimum kernel
version. Thanks!
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next prev parent reply other threads:[~2015-01-24 13:12 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-14 10:35 futex(2) man page update help request Michael Kerrisk (man-pages)
[not found] ` <537346E5.4050407-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-14 16:18 ` Darren Hart
2014-05-14 19:03 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkh+PWzT2SByaLk_OtiAXeZSkWoMgu+ivDOt1dTWVtaatQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-14 19:59 ` Darren Hart
2014-05-14 20:23 ` Carlos O'Donell
[not found] ` <5373D0CA.2050204-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-05-14 20:44 ` Andy Lutomirski
2014-05-14 23:34 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.02.1405150121230.6261-3cz04HxQygjZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2014-05-15 3:12 ` Carlos O'Donell
[not found] ` <537430B5.2060001-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-05-15 4:49 ` Michael Kerrisk (man-pages)
2014-05-15 4:53 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkjQ5Dd_U9OojXdgeforpRevvPHNFAw99kBFPCwHgf7Ggg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-15 14:14 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.02.1405151144390.6261-3cz04HxQygjZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2014-05-15 20:19 ` Michael Kerrisk (man-pages)
[not found] ` <53752157.9070803-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-08-04 14:46 ` Carlos O'Donell
2014-05-15 20:35 ` Darren Hart
[not found] ` <CF9A731D.913E6%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2015-01-15 15:12 ` Michael Kerrisk (man-pages)
[not found] ` <54B7D8D4.2070203-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-01-17 1:33 ` Darren Hart
2015-01-17 9:16 ` Michael Kerrisk (man-pages)
[not found] ` <54BA2872.5040003-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-01-17 19:26 ` Darren Hart
[not found] ` <D0DFF430.B7F94%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2015-01-18 10:18 ` Michael Kerrisk (man-pages)
2015-01-15 15:10 ` Michael Kerrisk (man-pages)
[not found] ` <54B7D87C.3090901-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-01-15 22:23 ` Thomas Gleixner
2015-01-16 15:17 ` Michael Kerrisk (man-pages)
[not found] ` <54B92B71.2090509-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-01-16 15:20 ` Thomas Gleixner
2015-01-16 20:54 ` Michael Kerrisk (man-pages)
[not found] ` <54B97A72.2050205-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-01-17 0:46 ` Darren Hart
[not found] ` <D0DEECA2.B7EAD%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2015-01-19 10:45 ` Thomas Gleixner
2015-01-19 14:07 ` Michael Kerrisk (man-pages)
2015-01-23 18:19 ` Torvald Riegel
2015-01-24 10:05 ` Thomas Gleixner
2015-01-24 12:58 ` Torvald Riegel
[not found] ` <1422104287.29655.13.camel-I2ZjUw8blINjztcc/or7kQ@public.gmane.org>
2015-01-24 16:25 ` Thomas Gleixner
2015-01-17 0:56 ` Davidlohr Bueso
[not found] ` <1421456216.27134.2.camel-h16yJtLeMjHk1uMJSBkQmQ@public.gmane.org>
2015-01-17 1:11 ` Darren Hart
2015-01-23 18:29 ` Torvald Riegel
[not found] ` <1422037788.29655.0.camel-I2ZjUw8blINjztcc/or7kQ@public.gmane.org>
2015-01-24 11:35 ` Thomas Gleixner
2015-01-24 13:12 ` Torvald Riegel [this message]
[not found] ` <1422105142.29655.16.camel-I2ZjUw8blINjztcc/or7kQ@public.gmane.org>
2015-01-27 7:48 ` Michael Kerrisk (man-pages)
2015-02-05 19:57 ` Darren Hart
2014-05-15 8:13 ` Peter Zijlstra
[not found] ` <20140515081357.GC11096-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2014-05-15 15:43 ` Darren Hart
2014-05-15 8:14 ` Peter Zijlstra
[not found] ` <20140515081444.GD11096-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2014-05-15 13:18 ` Carlos O'Donell
[not found] ` <5374BE9E.8080408-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-05-15 13:22 ` Peter Zijlstra
[not found] ` <20140515132235.GM30445-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2014-05-15 13:49 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkjrS8WWMoQzsiOkMVn1_Bf06uFCL6ECU7z=mv0fszg+gQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-15 13:55 ` Peter Zijlstra
2014-05-15 14:39 ` Carlos O'Donell
2014-05-15 15:11 ` Peter Zijlstra
2014-05-14 20:56 ` Davidlohr Bueso
2014-05-14 21:03 ` Darren Hart
[not found] ` <CF99279F.907FC%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-05-14 22:21 ` Paul E. McKenney
[not found] ` <1400100977.3865.30.camel-5JQ4ckphU/8SZAcGdq5asR6epYMZPwEe5NbjCUgZEJk@public.gmane.org>
2014-05-15 0:28 ` H. Peter Anvin
2014-05-15 0:35 ` Andy Lutomirski
[not found] ` <CALCETrXzMiS9DwvmZn++wg0x6v-ZR0YP9fAdco4PRST=nTY4nQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-15 0:41 ` H. Peter Anvin
[not found] ` <53740A30.20807-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2014-05-15 19:10 ` Carlos O'Donell
[not found] ` <CF98E3EF.90564%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-05-14 21:05 ` Davidlohr Bueso
2014-05-15 15:15 ` Joseph S. Myers
2014-05-15 0:18 ` H. Peter Anvin
[not found] ` <537407ED.8050606-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2014-05-15 5:21 ` Darren Hart
[not found] ` <CF999CD6.90A93%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-05-15 8:23 ` Peter Zijlstra
2014-05-15 13:46 ` Michael Kerrisk (man-pages)
[not found] ` <5374C54B.7040408-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-15 14:59 ` H. Peter Anvin
2014-05-15 15:42 ` chrubis
[not found] ` <20140515154246.GC6926-HSzIOc4LzcM@public.gmane.org>
2014-05-15 15:52 ` H. Peter Anvin
[not found] ` <5374E2A4.2070408-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2014-05-15 16:01 ` chrubis-AlSwsSmVLrQ
[not found] ` <20140515160152.GA7529-HSzIOc4LzcM@public.gmane.org>
2014-05-15 16:07 ` H. Peter Anvin
[not found] ` <5374E653.2080309-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2014-05-15 16:17 ` chrubis-AlSwsSmVLrQ
2014-05-15 16:56 ` H. Peter Anvin
[not found] ` <5374F1B3.9080006-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2014-05-15 17:06 ` chrubis-AlSwsSmVLrQ
2014-05-15 15:47 ` Darren Hart
2014-05-15 15:35 ` chrubis-AlSwsSmVLrQ
2014-05-15 15:28 ` chrubis-AlSwsSmVLrQ
[not found] ` <20140515152834.GA6926-HSzIOc4LzcM@public.gmane.org>
2014-05-15 15:40 ` Steven Rostedt
2014-05-15 16:14 ` Darren Hart
[not found] ` <CF9A3521.90ECC%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-05-15 16:30 ` chrubis-AlSwsSmVLrQ
[not found] ` <20140515163004.GB7959-HSzIOc4LzcM@public.gmane.org>
2014-05-15 18:17 ` Darren Hart
[not found] ` <CF9A3A75.90F40%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-05-15 19:05 ` chrubis-AlSwsSmVLrQ
[not found] ` <20140515190529.GA8887-HSzIOc4LzcM@public.gmane.org>
2014-05-15 19:38 ` Darren Hart
[not found] ` <CF9A658E.91322%dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-08-11 10:19 ` chrubis-AlSwsSmVLrQ
2014-11-26 13:41 ` Cyril Hrubis
2015-02-16 13:14 ` Cyril Hrubis
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