On Mon, 24 Aug 2009, Avi Kivity wrote: > On 08/24/2009 09:25 PM, Davide Libenzi wrote: > > Indeed, the default eventfd behaviour is like, well, an event. Signaling > > (kernel side) or writing (userspace side), signals the event. > > Waiting (reading) it, will reset the event. > > If you use EFD_SEMAPHORE, you get a semaphore-like behavior. > > Events and sempahores are two widely known and used abstractions. > > The EFD_STATE proposed one, well, no. Not at all. > > > > There are libraries that provide notifications (or fire watches) when some > value changes. They're much less frequently used than events or semaphores, > though.
There are userspace libraries that do almost everything, but you hardly see things like pthread_(EFD_STATE-like)_create() or similar system interfaces based on such abstraction. Is that really difficult to understand where I'm standing, leaving the KVM hat off for a moment? - Davide -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
