Any process can write data to a Shared memory region, and the data are readable and modified by other processes.

任何进程都可以向共享内存区域写入数据，并且数据可以由其他进程读取或修改。

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You will fall into one of them when you memory map a file and then call write while another process truncates the same file.

例如，考虑一下在内存中对文件进行映射后调用write，与此同时另外一个进程将同一文件截断的情形。

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Each operating-system process is allocated its own virtual address space — a set of virtual-memory pages that it can read from and write to. Each page can be in one of three states.

每个操作系统进程占用自己的虚拟地址空间，即一组可以读写的虚拟内存页。

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