EVLOOP_NONBLOCK
if (!base->event_count_active && !(flags & EVLOOP_NONBLOCK)) {
} else if (flags & EVLOOP_NONBLOCK)
event_loop(EVLOOP_NONBLOCK);
event_base_loop(base2, EVLOOP_NONBLOCK);
event_base_loop(base1, EVLOOP_NONBLOCK);
event_base_loop(base1, EVLOOP_NONBLOCK);
event_base_loop(base1, EVLOOP_NONBLOCK);
event_base_loop(base2, EVLOOP_NONBLOCK);