An operating system that supports preemptivemultitasking creates the effect of simultaneous execution of multiple threads from multiple processes.
支援先占式多工的作业系统能够从多个处理序产生同时执行多个执行绪的效果。
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In the 1990s, when Copland was initiated, "next-generation" meant supporting memory protection and preemptivemultitasking, both of which classic Mac OS lacked.