EVLIST_INIT
ev->ev_flags = EVLIST_INIT;
if (ev->ev_flags != EVLIST_INIT)
#define evtimer_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)
#define timeout_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)
#define signal_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)
#define event_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)