int app_worker_unlisten_reply (app_worker_t *app_wrk, session_handle_t sh,
u32 opaque, session_error_t err);
int app_worker_accept_notify (app_worker_t * app_wrk, session_t * s);
int app_worker_unlisten_reply (app_worker_t *app_wrk, session_handle_t sh,
u32 opaque, session_error_t err);
int app_worker_accept_notify (app_worker_t * app_wrk, session_t * s);