# File lib/timeout.rb, line 47
  def timeout(sec, exception=Error)
    return yield if sec == nil or sec.zero?
    raise ThreadError, "timeout within critical session" if Thread.critical
    begin
      x = Thread.current
      y = Thread.start {
        sleep sec
        x.raise exception, "execution expired" if x.alive?
      }
      yield sec
      #    return true
    ensure
      y.kill if y and y.alive?
    end
  end