Subject: Re: Revised futex(2) man page for review
From: Torvald Riegel <triegel@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
        Darren Hart <dvhart@linux.intel.com>,
        "Carlos O'Donell" <carlos@redhat.com>, 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 <dave@stgolabs.net>, Arnd Bergmann <arnd@arndb.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        Linux API <linux-api@vger.kernel.org>,
        Roland McGrath <roland@hack.frob.com>,
        Darren Hart <dvhart@infradead.org>, Anton Blanchard <anton@samba.org>,
        Eric Dumazet <edumazet@google.com>,
        bill o gallmeister <bgallmeister@gmail.com>,
        Jan Kiszka <jan.kiszka@siemens.com>, Daniel Wagner <wagi@monom.org>,
        Rich Felker <dalias@libc.org>, Andy Lutomirski <luto@amacapital.net>,
        bert hubert <bert.hubert@netherlabs.nl>,
        Rusty Russell <rusty@rustcorp.com.au>,
        Heinrich Schuchardt <xypron.glpk@gmx.de>
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Date: Wed, 15 Apr 2015 12:28:45 +0200
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On Tue, 2015-04-14 at 23:40 +0200, Thomas Gleixner wrote:
> On Sat, 28 Mar 2015, Peter Zijlstra wrote:
> > On Sat, Mar 28, 2015 at 09:53:21AM +0100, Michael Kerrisk (man-pages) wrote:
> > > So, please take a look at the page below. At this point,
> > > I would most especially appreciate help with the FIXMEs.
> > 
> > For people who cannot read that troff gibberish (me)..
> 
> Ditto :)
>  
> > NOTES
> >        Glibc does not provide a wrapper for this system call;  call  it  using
> >        syscall(2).
> 
> You might mention that pthread_mutex, pthread_condvar interfaces are
> high level wrappers for the syscall and recommended to be used for
> normal use cases. IIRC unnamed semaphores are implemented with futexes
> as well.

If we add this, I'd rephrase it to something like that there are
high-level programming abstractions such as the pthread_condvar
interfaces or semaphores that are implemented using the syscall and that
are typically a better fit for normal use cases.  I'd consider only the
condvars as something like a wrapper, or targeting a similar use case.

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