For processes 1 and 2, the recv function is blocking, which means that the program will wait until it receives a message with tag ID 9 from process 0.

对于进程1和2,recv函数被阻塞，这意味着程序会等待，直到从进程0收到标签id为9的消息。

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Once the message has been sent, the sender can store a reference to the Future object and check periodically for completion, or it can block and wait if needed by calling the get method.

消息被发送之后，发送者可以保存对Future对象的一个引用并定期检查是否完成，或者，它也可以通过调用get方法来阻塞和等待。

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The service bus subsystem automatically provided for both types of interaction, given that it was purely message based and supported a read method that could wait for an incoming message.

如果服务总线子系统是纯粹基于消息的，而且支持某种用来等待传入消息的读取方法，它将自动提供这两种类型的交互。

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