callback_out     1920 opal/mca/event/libevent2022/libevent/event.c event_get_assignment(const struct event *event, struct event_base **base_out, evutil_socket_t *fd_out, short *events_out, event_callback_fn *callback_out, void **arg_out)
callback_out     1930 opal/mca/event/libevent2022/libevent/event.c 	if (callback_out)
callback_out     1931 opal/mca/event/libevent2022/libevent/event.c 		*callback_out = event->ev_callback;
callback_out     1050 opal/mca/event/libevent2022/libevent/include/event2/event.h     event_callback_fn *callback_out, void **arg_out);