# File lib/httpclient/timeout.rb, line 125
      def timeout(sec, ex = nil, &block)
        return yield if sec == nil or sec.zero?
        scheduler = nil
        begin
          scheduler = HTTPClient.timeout_scheduler
          period = scheduler.register(Thread.current, sec, ex)
          yield(sec)
        ensure
          scheduler.cancel(period) if scheduler and period
        end
      end