The end address of the instance Shared memory segment is not fixed.

实例共享内存的结束地址是不固定的。

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The code implements a parent and child process that communicates via a shared memory segment.

代码实现通过共享内存段通信的父进程和子进程。

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Finally, in Figure 4, processes a and B can read and write from the Shared memory segment freely.

最后，在图4中，进程a和B可以随意读写共享内存段。

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