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. Paolo
