Re: [PATCH 0/2] eventfd: new EFD_STATE flag

[Paolo Bonzini]

On 08/23/2009 04:30 PM, Michael S. Tsirkin wrote:
> On Sun, Aug 23, 2009 at 04:40:51PM +0300, Avi Kivity wrote:
> > On 08/23/2009 04:36 PM, Michael S. Tsirkin wrote:
> > > More important here is realization that eventfd is a mutex/semaphore
> > > implementation, not a generic event reporting interface as we are trying
> > > to use it.
> >
> > Well it is a generic event reporting interface (for example, aio uses it).
>
> Davide, I think it's a valid point.  For example, what read on eventfd
> does (zero a counter and return) is not like any semaphore I saw.

It is similar to Win32 events (which can be used like contorted mutexes 
to sync two processes).

Paolo

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