Problems implementing a multi-threaded UDP server (threadpool?)?

Your recvfrom should be in the master thread and when it gets data you should pass the address IP:Port and data of the UDP client to the helper threads.

I think that your main problem is the non-persistent udp connection. Udp is not keeping your connections alive, it exchanges only two datagrams per session. Depending on your application, in the worst case, it will have concurrent threads reading from the first available information, ie, recvfrom() will unblock even if it is not it's turn to do it.

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