From: Davidlohr Bueso <davidlohr@hp.com>
To: Darren Hart <dvhart@linux.intel.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Jakub Jelinek <jakub@redhat.com>,
"linux-man@vger.kernel.org" <linux-man@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Davidlohr Bueso <davidlohr.bueso@hp.com>,
Arnd Bergmann <arnd@arndb.de>,
Steven Rostedt <rostedt@goodmis.org>,
Peter Zijlstra <peterz@infradead.org>,
Linux API <linux-api@vger.kernel.org>,
"Carlos O'Donell" <carlos@redhat.com>
Subject: Re: futex(2) man page update help request
Date: Wed, 14 May 2014 14:05:22 -0700 [thread overview]
Message-ID: <1400101522.6897.1.camel@buesod1.americas.hpqcorp.net> (raw)
In-Reply-To: <CF98E3EF.90564%dvhart@linux.intel.com>
On Wed, 2014-05-14 at 09:18 -0700, Darren Hart wrote:
> On 5/14/14, 3:35, "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
> wrote:
>
> >[So, some futex recent discussions remind me I should make this request]
> >
> >Hello all (especially those in the To:, namely Thomas, Darren, Ingo,
> >Jakub),
> >
> >The futex man pages:
> >http://man7.org/linux/man-pages/man2/futex.2.html
> >http://man7.org/linux/man-pages/man7/futex.7.html
> >are currently in a sorry state. I'm by no means convinced that all of the
> >futex operations described there are explained fully and correctly. And
> >probably not all error cases for each operation are properly documented.
> >I'd be very happy if some folk could review those pages and send me
> >corrections (Git:
> >http://git.kernel.org/pub/scm/docs/man-pages/man-pages).
> >
> >But worse, a number of futex operations remain undocumented in futex(2)
> >(see the list below).
> >
> >I am aware of Documentation/pi-futex.txt and
> >Documentation/futex-requeue-pi.txt. However, both of those documents
> >are rather thin on details / explain what certain FUTEX_* operations are
> >used for rather than what they do / focus on the implementation, rather
> >than the semantics.
> >
> >What I would like is that the futex(2) page documenta each one of
> >these operations with a focus on the semantics in a way that might be
> >useful to writers of library functions or those who simply wish to
> >better understand (from a user-space perspective) what futexes are
> >and how they are used. However, I don't have the knowledge to do
> >this well in any reasonable time.
> >
> >Would the folk in the To: list (or anyone else who is knowledgeable)
> >be willing to write patches
> >(Git: http://git.kernel.org/pub/scm/docs/man-pages/man-pages )
> >or just supply me with some raw text that documents these currently
> >undocumented futex operations, in the manner suggested?
>
> Yes, I'll be glad to help.
>
> However, unless I'm sorely mistaken, the larger problem is that glibc
> removed the futex() call entirely, so these man pages don't describe
> something users even have access to anymore. I had to revert to calling
> the syscalls directly in the futextest test suite because of this:
>
> http://git.kernel.org/cgit/linux/kernel/git/dvhart/futextest.git/tree/inclu
> de/futextest.h#n67
>
>
> Which basically defines:
>
> #define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
> syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)
Yeah, and I actually stole that from you for perf :)
>
> Adding Carlos for his perspective.
>
> If I'm wrong, or we can restore the futex() call, great. If not... Should
> we keep the man-pages and document it as syscall(SYS_futex, ..., op, ...) ?
+1, is there anything preventing adding a futex wrapper... glibc folks?
next prev parent reply other threads:[~2014-05-14 21:06 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)
2014-05-14 16:18 ` Darren Hart
2014-05-14 19:03 ` Michael Kerrisk (man-pages)
2014-05-14 19:59 ` Darren Hart
2014-05-14 20:23 ` Carlos O'Donell
2014-05-14 20:44 ` Andy Lutomirski
2014-05-14 23:34 ` Thomas Gleixner
2014-05-15 3:12 ` Carlos O'Donell
2014-05-15 4:49 ` Michael Kerrisk (man-pages)
2014-05-15 4:53 ` Michael Kerrisk (man-pages)
2014-05-15 14:14 ` Thomas Gleixner
2014-05-15 20:19 ` Michael Kerrisk (man-pages)
2014-08-04 14:46 ` Carlos O'Donell
2014-05-15 20:35 ` Darren Hart
2015-01-15 15:12 ` Michael Kerrisk (man-pages)
2015-01-17 1:33 ` Darren Hart
2015-01-17 9:16 ` Michael Kerrisk (man-pages)
2015-01-17 19:26 ` Darren Hart
2015-01-18 10:18 ` Michael Kerrisk (man-pages)
2015-01-15 15:10 ` Michael Kerrisk (man-pages)
2015-01-15 22:23 ` Thomas Gleixner
2015-01-16 15:17 ` Michael Kerrisk (man-pages)
2015-01-16 15:20 ` Thomas Gleixner
2015-01-16 20:54 ` Michael Kerrisk (man-pages)
2015-01-17 0:46 ` Darren Hart
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
2015-01-24 16:25 ` Thomas Gleixner
2015-01-17 0:56 ` Davidlohr Bueso
2015-01-17 1:11 ` Darren Hart
2015-01-23 18:29 ` Torvald Riegel
2015-01-24 11:35 ` Thomas Gleixner
2015-01-24 13:12 ` Torvald Riegel
2015-01-27 7:48 ` Michael Kerrisk (man-pages)
2015-02-05 19:57 ` Darren Hart
2014-05-15 8:13 ` Peter Zijlstra
2014-05-15 15:43 ` Darren Hart
2014-05-15 8:14 ` Peter Zijlstra
2014-05-15 13:18 ` Carlos O'Donell
2014-05-15 13:22 ` Peter Zijlstra
2014-05-15 13:49 ` Michael Kerrisk (man-pages)
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
2014-05-14 22:21 ` Paul E. McKenney
2014-05-15 0:28 ` H. Peter Anvin
2014-05-15 0:35 ` Andy Lutomirski
2014-05-15 0:41 ` H. Peter Anvin
2014-05-15 19:10 ` Carlos O'Donell
2014-05-14 21:05 ` Davidlohr Bueso [this message]
2014-05-15 15:15 ` Joseph S. Myers
2014-05-15 0:18 ` H. Peter Anvin
2014-05-15 5:21 ` Darren Hart
2014-05-15 8:23 ` Peter Zijlstra
2014-05-15 13:46 ` Michael Kerrisk (man-pages)
2014-05-15 14:59 ` H. Peter Anvin
2014-05-15 15:42 ` chrubis
2014-05-15 15:52 ` H. Peter Anvin
2014-05-15 16:01 ` chrubis
2014-05-15 16:07 ` H. Peter Anvin
2014-05-15 16:17 ` chrubis
2014-05-15 16:56 ` H. Peter Anvin
2014-05-15 17:06 ` chrubis
2014-05-15 15:47 ` Darren Hart
2014-05-15 15:35 ` chrubis
2014-05-15 15:28 ` chrubis
2014-05-15 15:40 ` Steven Rostedt
2014-05-15 16:14 ` Darren Hart
2014-05-15 16:30 ` chrubis
2014-05-15 18:17 ` Darren Hart
2014-05-15 19:05 ` chrubis
2014-05-15 19:38 ` Darren Hart
2014-08-11 10:19 ` chrubis
2014-11-26 13:41 ` Cyril Hrubis
2015-02-16 13:14 ` Cyril Hrubis
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1400101522.6897.1.camel@buesod1.americas.hpqcorp.net \
--to=davidlohr@hp.com \
--cc=arnd@arndb.de \
--cc=carlos@redhat.com \
--cc=davidlohr.bueso@hp.com \
--cc=dvhart@linux.intel.com \
--cc=jakub@redhat.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-man@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mtk.manpages@gmail.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).