使用 Boost Asio 从串口读取

I'm want to check for incoming data packages on the serial port, using boost.asio. Each data packet will start with a header that is one byte long, and will specify what type of the message has been sent. Each different type of message has its own length. The function I want to write should listen for new incoming messages continually, and when it finds one it should read it, and call some other function to parse it. My current code is as follows:

void check_for_incoming_messages()
{
    boost::asio::streambuf response;
    boost::system::error_code error;
    std::string s1, s2;
    if (boost::asio::read(port, response, boost::asio::transfer_at_least(0), error)) {
        s1 = streambuf_to_string(response);
        int msg_code = s1[0];
        if (msg_code < 0 || msg_code >= NUM_MESSAGES) {
            // Handle error, invalid message header
        }
        if (boost::asio::read(port, response, boost::asio::transfer_at_least(message_lengths[msg_code]-s1.length()), error)) {
            s2 = streambuf_to_string(response);
            // Handle the content of s1 and s2
        }
        else if (error != boost::asio::error::eof) {
            throw boost::system::system_error(error);
        }
    }
    else if (error != boost::asio::error::eof) {
        throw boost::system::system_error(error);
    }
}

boost::asio::streambuf 是正确的工具吗?以及如何从中提取数据以便解析消息?我还想知道我是否需要一个单独的线程来只调用这个函数，以便更频繁地调用它.我是否应该担心由于高流量和串行端口缓冲区耗尽而在两次调用函数之间丢失数据?我正在使用 Qt 的 GUI 库，但我真的不知道处理所有事件需要多少时间.