linux-kernel - Re: Why does timerfd() only support CLOCK_REALTIME and CLOCK

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Message-ID: <alpine.DEB.1.10.0902081320560.18839@alien.or.mcafeemobile.com>
Date:	Sun, 8 Feb 2009 13:22:04 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	mtk.manpages@...il.com
cc:	"linux-man@...r.kernel.org" <linux-man@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Why does timerfd() only support CLOCK_REALTIME and 
 CLOCK_MONOTONIC?

On Mon, 9 Feb 2009, Michael Kerrisk wrote:

> On Mon, Feb 9, 2009 at 9:46 AM, Davide Libenzi <davidel@...ilserver.org> wrote:
> > On Sun, 8 Feb 2009, Davide Libenzi wrote:
> >
> >> On Mon, 9 Feb 2009, Michael Kerrisk wrote:
> >>
> >> > Hi Davide,
> >> >
> >> > At the moment I'm looking into writing man pages for timer_create(2)
> >> > and friends.  (Somewhat bizarrely, these pages do not yet exist.)  As
> >> > I looked into the source code of timer_create(), etc., and did some
> >> > tests, I saw that timer_create() supports the following clocks:
> >> >
> >> > TIMER_REALTIME
> >> > TIMER_MONOTONIC
> >> > TIMER_PROCESS_CPUTIME_ID
> >> > TIMER_THREAD_CPUTIME_ID
> >> > clockid obtained from clock_getcpuclockid(3)
> >> > clockid obtained from pthread_getcpuclockid(3)
> >> >
> >> > On the other hand, timerfd() only permits the first two of these.
> >> > What's the reason for that limitation of timerfd()?  (It may be worth
> >> > adding something to the man page on this point.)
> >>
> >> No particular reason I can think of. If Thomas makes invalid_clockid()
> >> available, we could allow timerfd() to support all time timers
> >> timer_create() supports.
> >> Do you see any reason why this won't work Thomas?
> >
> > Patch, not tested, below.
> 
> (Has it been compiled?)

Yes, it builds fine. I just haven't had time to test it ATM...



- Davide


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