UNIX runs many tasks seemingly at the same time because each process receives a little slice of CPU time in a (conceptually) round-robin fashion.

UNIX似乎能同时运行很多任务，这是因为每个进程都会轮流(从概念上来讲)分到一小片CPU时间。

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RPDS partitions CPU time flow into continuous segments, and in each segment RPDS will forcibly assign one time slice to non-hard real-time tasks.

RPDS将处理器时间流分成连续的小段，并在每一小段中强制为非硬实时任务分配一个时间片。

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