# File lib/active_support/vendor/memcache-client-1.5.0/memcache.rb, line 819
    def close
      @mutex.lock if @multithread
      @sock.close if @sock && !@sock.closed?
      @sock   = nil
      @retry  = nil
      @status = "NOT CONNECTED"
    ensure
      @mutex.unlock if @multithread
    end