Fix Event::set() re-entrant infinite loop#37
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When a resumed waiter re-registers via clear() + wait() inside set()'s while loop, waiters_ never becomes empty, causing an infinite loop. Swap waiters_ into a local queue before iterating so new waiters added during resume() are deferred to the next set() call.
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When a resumed waiter re-registers via clear() + wait() inside set()'s while loop, waiters_ never becomes empty, causing an infinite loop. Swap waiters_ into a local queue before iterating so new waiters added during resume() are deferred to the next set() call.