ev_ref
ev_ref (EV_A); /* child watcher */
ev_ref (EV_A);
ev_ref (EV_A);
if (ev_is_active (&w->timer)) ev_ref (EV_A);
ev_ref (EV_A);
if (ev_is_active (&w->timer)) ev_ref (EV_A);
ev_ref (EV_A);
ev_ref (EV_A);
EV_API_DECL void ev_ref (EV_P) EV_THROW;