lazy_initialize

# File lib/resolv.rb, line 863
      def lazy_initialize
        @mutex.synchronize {
          unless @initialized
            @nameserver = []
            @search = nil
            @ndots = 1
            case @config_info
            when nil
              config_hash = Config.default_config_hash
            when String
              config_hash = Config.parse_resolv_conf(@config_info)
            when Hash
              config_hash = @config_info.dup
              if String === config_hash[:nameserver]
                config_hash[:nameserver] = [config_hash[:nameserver]]
              end
              if String === config_hash[:search]
                config_hash[:search] = [config_hash[:search]]
              end
            else
              raise ArgumentError.new("invalid resolv configuration: #{@config_info.inspect}")
            end
            @nameserver = config_hash[:nameserver] if config_hash.include? :nameserver
            @search = config_hash[:search] if config_hash.include? :search
            @ndots = config_hash[:ndots] if config_hash.include? :ndots

            @nameserver = ['0.0.0.0'] if @nameserver.empty?
            if @search
              @search = @search.map {|arg| Label.split(arg) }
            else
              hostname = Socket.gethostname
              if /\./ =~ hostname
                @search = [Label.split($')]
              else
                @search = [[]]
              end
            end

            if !@nameserver.kind_of?(Array) ||
               !@nameserver.all? {|ns| String === ns }
              raise ArgumentError.new("invalid nameserver config: #{@nameserver.inspect}")
            end

            if !@search.kind_of?(Array) ||
               !@search.all? {|ls| ls.all? {|l| Label::Str === l } }
              raise ArgumentError.new("invalid search config: #{@search.inspect}")
            end

            if !@ndots.kind_of?(Integer)
              raise ArgumentError.new("invalid ndots config: #{@ndots.inspect}")
            end

            @initialized = true
          end
        }
        self
      end