> Yes, they do and it should work (I haven't tried, though).
>
> There is a practical problem when waiting on a futex in multiple
> threads using epoll: you need a separate fd per waiter, rather than an
> fd per waited-on futex. This is because some uses of futexes depend
> on waiters being woken in the exact order that they were queued.
Not really Jamie. See a Futex event is not much different from a network
one. When the event shows up, one thread will pick it up (epoll_wait) and
will handle it. A futex event will very likely be a green light for some
sort of resource usage that whatever thread can pick up and handle.
- Davide
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