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