# File lib/observable_pool.rb, line 20
    def initialize(observable, mutex)
      @observable = observable
      @observable.add_observer(self)
      @mutex = mutex
    end

# File lib/observable_pool.rb, line 33
    def method_missing(meth, *args, &block)
      @observable.send(meth, *args, &block)
    end

# File lib/observable_pool.rb, line 26
    def update(*args, &block)
      @mutex.synchronize do
        changed
        notify_observers(@observable, *args, &block)
      end
    end