What is the most correct way to read data from QUdpSocket?

Question

Qt

Good day!
I took out the work with sockets in a separate thread and the question arose of how it would be most correct to receive packets.

Or, as usual, by subscribing to the event:

connect(_socket, &QUdpSocket::readyRead, this, &UDPStream::onReadyRead);

or in a thread loop

if (_socket->hasPendingDatagrams()) {
        QByteArray data;
        data.resize(_socket->pendingDatagramSize());
        .........
}

What happens if I poll with an interval of, for example, 3ms? I mean, will there be any losses until the next packet is processed? Those. Will all incoming UDP packets be placed in a queue and wait in it until they are read? If so, what is the size of this queue (I assume that the network card / system is already doing this, but still)?

Answer 1

And it will work anyway. The size of the queue depends on the bandwidth and availability of the network adapter.