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SubjectRe: [RFC] eventfd: add EFD_AUTORESET flag
On Wed, Feb 12, 2020 at 09:31:32AM +0100, Paolo Bonzini wrote:
> On 29/01/20 18:20, Stefan Hajnoczi wrote:
> > + /* Semaphore semantics don't make sense when autoreset is enabled */
> > + if ((flags & EFD_SEMAPHORE) && (flags & EFD_AUTORESET))
> > + return -EINVAL;
> > +
>
> I think they do, you just want to subtract 1 instead of setting the
> count to 0. This way, writing 1 would be the post operation on the
> semaphore, while poll() would be the wait operation.

True! Then EFD_AUTORESET is not a fitting name. EFD_AUTOREAD or
EFD_POLL_READS?

Stefan
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