Function pulsar_sys::pulsar_reader_read_next

pub unsafe extern "C" fn pulsar_reader_read_next(
    reader: *mut pulsar_reader_t, 
    msg: *mut *mut pulsar_message_t
) -> pulsar_result

Read a single message.

If a message is not immediately available, this method will block until a new message is available.

@param msg a non-const reference where the received message will be copied @return ResultOk when a message is received @return ResultInvalidConfiguration if a message listener had been set in the configuration