lazy_initialize

# File lib/resolv.rb, line 742
        def lazy_initialize
          @mutex.synchronize {
            next if @initialized
            @initialized = true
            @socks_hash = {}
            @socks = []
            @nameserver_port.each {|host, port|
              if host.index(':')
                bind_host = "::"
                af = Socket::AF_INET6
              else
                bind_host = "0.0.0.0"
                af = Socket::AF_INET
              end
              next if @socks_hash[bind_host]
              begin
                sock = UDPSocket.new(af)
              rescue Errno::EAFNOSUPPORT
                next # The kernel doesn't support the address family.
              end
              @socks << sock
              @socks_hash[bind_host] = sock
              sock.do_not_reverse_lookup = true
              DNS.bind_random_port(sock, bind_host)
            }
          }
          self
        end