lazy_initialize

# File lib/resolv.rb, line 824
        def lazy_initialize
          @mutex.synchronize {
            next if @initialized
            @initialized = true
            is_ipv6 = @host.index(':')
            sock = UDPSocket.new(is_ipv6 ? Socket::AF_INET6 : Socket::AF_INET)
            @socks = [sock]
            sock.do_not_reverse_lookup = true
            DNS.bind_random_port(sock, is_ipv6 ? "::" : "0.0.0.0")
            sock.connect(@host, @port)
          }
          self
        end