# Pastebin i0ZtAz8y
def wait_done_or_dead(futs, dead, check_timeout=1):
    while True:
        _done, not_done = futures.wait(futs, timeout=check_timeout)
        if len(not_done) == 0:
            break
        if dead.is_set():
            for fut in not_done:
                # This may not actually be able to cancel, but try to
                # if we can.
                fut.cancel()