pub unsafe extern "C" fn rd_kafka_consume_callback(
rkt: *mut rd_kafka_topic_t,
partition: i32,
timeout_ms: c_int,
consume_cb: Option<unsafe extern "C" fn(rkmessage: *mut rd_kafka_message_t, commit_opaque: *mut c_void)>,
commit_opaque: *mut c_void,
) -> c_int