Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove
From: Michael S. Tsirkin
Date: Thu Jan 21 2010 - 12:53:26 EST
On Thu, Jan 21, 2010 at 09:50:34AM -0800, Davide Libenzi wrote:
> 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
Userspace can but kvm can't.
> - Davide
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