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。
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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