"However, rather than accepting connections using this socket, it is passed off to some number of child processes using net.Stream.write() (under the covers this uses sendmsg(2) and FDs are delivered using recvmsg(2)). Each of these processes in turn inserts the received file descriptor into its event loop and accepts incoming connections as they become available. The OS kernel itself is responsible for load balancing connections across processes."

Racing (ie thread-safe) accept() is a really good way to improve server throughput. Epoll is also awesome for being thread-safe.