From: Thomas Gleixner <tglx@linutronix.de>
To: Nick Piggin <npiggin@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [rfc][patch] futex: restartable futex_wait?
Date: Fri, 09 Mar 2007 10:38:35 +0100 [thread overview]
Message-ID: <1173433115.3999.2.camel@chaos> (raw)
In-Reply-To: <20070309051038.GA12479@wotan.suse.de>
On Fri, 2007-03-09 at 06:10 +0100, Nick Piggin wrote:
> > i think that's quite right. I'm wondering why this never came up before?
> > But your fix is not complete i think:
> >
> > > + restart->arg2 = time;
> > > + return -ERESTART_RESTARTBLOCK;
> > > + }
> >
> > 'time' here is relative, so the restarted syscall will do a /full/ wait
> > again.
>
> But it has been modified by schedule_timeout?
But this does not change the syscall registers, so it is restarted in
the same way. We need a new futex OP for this, which takes absolute time
like the PI futex op does.
tglx
next prev parent reply other threads:[~2007-03-09 9:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-07 15:33 Nick Piggin
2007-03-08 17:29 ` Ingo Molnar
2007-03-08 23:02 ` Thomas Gleixner
2007-03-09 5:15 ` Nick Piggin
2007-03-09 5:10 ` Nick Piggin
2007-03-09 9:38 ` Thomas Gleixner [this message]
2007-03-09 12:24 ` Nick Piggin
2007-03-09 13:10 ` Thomas Gleixner
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