typedef void (*io_cb_t)(event_loop_t *loop, void *data, int flags);
typedef void (*timeout_cb_t)(event_loop_t *loop, void *data);
typedef void (*signal_cb_t)(event_loop_t *loop, void *data);
typedef void (*io_cb_t)(event_loop_t *loop, void *data, int flags);
typedef void (*timeout_cb_t)(event_loop_t *loop, void *data);
typedef void (*signal_cb_t)(event_loop_t *loop, void *data);
extern void signal_trigger(event_loop_t *loop, signal_t *sig);
extern void signal_del(event_loop_t *loop, signal_t *sig);
extern void signal_trigger(event_loop_t *loop, signal_t *sig);
extern void signal_del(event_loop_t *loop, signal_t *sig);
extern void event_loop_flush_output(event_loop_t *loop);
extern void event_loop_stop(event_loop_t *loop);
extern void event_loop_flush_output(event_loop_t *loop);
extern void event_loop_stop(event_loop_t *loop);