实际上，这个内存段直到访问它的所有进程都退出时才会删除，这与在UNIX中删除文件很相似。
The region is not actually removed until all processes accessing the region exit, much like any file in UNIX.
实际上，这个内存段直到访问它的所有进程都退出时才会删除，这与在UNIX中删除文件很相似。
The region is not actually removed until all processes accessing the region exit, much like any file in UNIX.
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