linux-kernel - Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove

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Message-ID: <alpine.DEB.2.00.1001210949280.8786@makko.or.mcafeemobile.com>
Date:	Thu, 21 Jan 2010 09:50:34 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Avi Kivity <avi@...hat.com>
cc:	"Michael S. Tsirkin" <mst@...hat.com>, mtosatti@...hat.com,
	kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove

On Thu, 21 Jan 2010, Avi Kivity wrote:

> On 01/21/2010 07:32 PM, Michael S. Tsirkin wrote:
> > 
> > > Can't you read from the file?
> > >      
> > IMO no, the read could block.
> >    
> 
> But you're in process context.  An eventfd never blocks.

Can you control the eventfd flags? Because if yes, O_NONBLOCK will never 
block.



- Davide


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