CS-438: Thread safe read and write for UDP socket

Hi,

I don't understand why (or if) the read and write function of the UDP socket should be thread safe. Indeed, when I studied the implementation of the socket based on channels, I noticed that we locked a mutex while sending and receiving packets.

But I didn't do that in my UDP socket implementation, and the tests (unit and integration) passed, even with -race.

So I was wondering if I should still add a mutex to make sure that the read and write function are thread safe ?

Thanks,

Re: Thread safe read and write for UDP socket

par Pierre René Alexandre Gimalac, lundi, 11 octobre 2021, 14:10

This is handled by the OS.

If you don't care about the low level details but just want to be sure, check https://pkg.go.dev/net#PacketConn , it says that "Multiple goroutines may invoke methods on a PacketConn simultaneously" (in particular ReadFrom and WriteTo).