pub unsafe extern "C" fn rd_kafka_produceva(
rk: *mut rd_kafka_t,
vus: *const rd_kafka_vu_t,
cnt: usize,
) -> *mut rd_kafka_error_t
pub unsafe extern "C" fn rd_kafka_produceva(
rk: *mut rd_kafka_t,
vus: *const rd_kafka_vu_t,
cnt: usize,
) -> *mut rd_kafka_error_t