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    SubjectRe: [PATCH Resend] epoll: add EPOLLEXCLUSIVE support
    On 03/29/2012 08:05 AM, Hagen Paul Pfeifer wrote:
    > * Jason Baron | 2012-03-29 10:16:53 [-0400]:
    >
    >> Right, for level triggered events, they all wait up. However, if you use
    >> edge triggered, ie add 'EPOLLET', then the event gets 'consumed' by the
    >> first thread that wakes up, and the subseqent waiters wouldn't get woken
    >> up. IE you'll get one wakeup.
    >
    > I addressed level triggered, right - it match the model. But I don't wanted to
    > wake up every every thread anyway. I don't want to abandon level triggered
    > functioning.

    I think that what you want is a mode in which, once epoll_wait returns,
    the bits it returns get cleared from the event mask. Am I right?

    (To get this right, you'd need another flag that disables the automatic
    addition of POLLERR and POLLHUP.)

    If you do that and add an extra syscall that simultaneously does a bunch
    of epoll_ctls, a timerfd_settime, and an epoll_wait, I'll be extra happy.

    --Andy


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