ev_async
ev_async_start (EV_P_ ev_async *w) EV_THROW
array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
ev_async_stop (EV_P_ ev_async *w) EV_THROW
ev_async_send (EV_P_ ev_async *w) EV_THROW
EV_WATCHER (ev_async)
struct ev_async async;
EV_API_DECL void ev_async_start (EV_P_ ev_async *w) EV_THROW;
EV_API_DECL void ev_async_stop (EV_P_ ev_async *w) EV_THROW;
EV_API_DECL void ev_async_send (EV_P_ ev_async *w) EV_THROW;
VARx(struct ev_async **, asyncs)