linux-kernel - Re: [rfc][patch] futex: restartable futex

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Message-ID: <20070309051038.GA12479@wotan.suse.de>
Date:	Fri, 9 Mar 2007 06:10:38 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [rfc][patch] futex: restartable futex_wait?

On Thu, Mar 08, 2007 at 06:29:02PM +0100, Ingo Molnar wrote:
> 
> * Nick Piggin <npiggin@...e.de> wrote:
> 
> > Hi Ingo,
> > 
> > I'm seeing an LTP test fail for ltp test sigaction_16_24. Basically, 
> > it tests whether the SA_RESTART flag works for the sem_wait operation.
> > 
> > I see sem_wait is implemented with futex_wait, so I wonder whether we 
> > can make it restartable? Am I going about it the right way? (Seems to 
> > fix the testcase here).
> 
> 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?

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