ev_unref
ev_unref (EV_A); /* watcher should not keep loop alive */
ev_unref (EV_A); /* child watcher should not keep loop alive */
ev_unref (EV_A);
ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
if (ev_is_active (&w->timer)) ev_unref (EV_A);
ev_unref (EV_A);
ev_unref (EV_A);
if (ev_is_active (&w->timer)) ev_unref (EV_A);
ev_unref (EV_A);
ev_unref (EV_A);
EV_API_DECL void ev_unref (EV_P) EV_THROW;