On 08/05/2015 13:24, Paolo Bonzini wrote: > > > On 08/05/2015 12:58, Catalin Vasile wrote: >> Is eventfd blocking? By that I mean: If I signal the guest for >> something, will that thread remain blocked till the guest clears the >> interrupt? > > No. If you want that, write 2^64-2 to the eventfd and do a > > pfd.fd = ... > pfd.events = POLLOUT; > poll(&pfd, 1, -1); > > after the write. > > With this algorithm, a write will fail with EINVAL if there is already > another pending write somewhere. The "poll" will still work after the > failed write.
Oops, EAGAIN... Paolo