Add additional epoll tests #2758
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Test the race-condition where Linux avoids spurious wakeups for `epoll_wait` if the epoll status changes before the threads are woken.
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Test the race-condition where Linux avoids spurious wakeups for
epoll_waitif the epoll status changes before the threads are woken.I wasn't sure if level-triggered
epoll_wait()was guaranteed to be woken for all threads (it's not), so I tried it and figured it probably doesn't hurt to add a test for it.