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    SubjectRe: [PATCH 0/2] eventfd: new EFD_STATE flag

    >>> 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.
    >>
    >> It actually seems as close to a condition variable as an eventfd can be.
    >
    > A pthread condition typical code usage maps to eventfd like:
    >
    > while (read(efd, ...)> 0)
    > if (CONDITION)
    > break;
    >
    > So a pthread condition is really a wakeup gate like eventfd is.
    > EFD_STATE has nothing to do with a pthread condition.

    No, your code does not work for pthread_cond_broadcast (which arguably
    is the common case) because all the eventfd readers after the first
    would block.

    Paolo


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