while (!QUEUE_EMPTY(&loop->watcher_queue)) {
    q = QUEUE_HEAD(&loop->watcher_queue);
    QUEUE_REMOVE(q);
    QUEUE_INIT(q);

    w = QUEUE_DATA(q, uv__io_t, watcher_queue);
    assert(w->pevents != 0);
    assert(w->fd >= 0);
    assert(w->fd < (int) loop->nwatchers);

    e.events = w->pevents;
    e.data = w->fd;

    if (w->events == 0)
      op = UV__EPOLL_CTL_ADD;
    else
      op = UV__EPOLL_CTL_MOD;
    if (uv__epoll_ctl(loop->backend_fd, op, w->fd, &e)) {
      if (errno != EEXIST)
        abort();
      if (uv__epoll_ctl(loop->backend_fd, UV__EPOLL_CTL_MOD, w->fd, &e))
        abort();
    }

    w->events = w->pevents;
  }

for(;;){
    nfds = uv__epoll_wait(loop->backend_fd,
                                events,
                                ARRAY_SIZE(events),
                                timeout);
    //... run callback for every events.
}