preemptive scheduling 剥夺式调度

In computing, preemption is the act of temporarily interrupting a task being carried out by a computer system, without requiring its cooperation, and with the intention of resuming the task at a later time. Such changes of the executed task are known as context switches. It is normally carried out by a privileged task or part of the system known as a preemptive scheduler, which has the power to preempt, or interrupt, and later resume, other tasks in the system.

@reference_1_wikipedia
Preemption (computing)

剥夺式（preemptive）调度，又称抢先式调度。当进程/线程正在处理器上运行时，系统可根据所规定的原则剥夺分配给此进程/线程的处理器，并将其移入就绪列队，选择其他进程/线程运行。

 有两种常用的处理器剥夺原则，一是高优先级进程/线程可剥夺低进程/线程；二是当运行进程/线程的时间片用完后被剥夺，在动态改变进程/线程优先级的系统中，经常会出现这样的情况。

@reference_1_baike.baidu.com 

剥夺式调度

@reference_3_differencebetween.net
Difference between Preemptive and Non-Preemptive Scheduling in Operating Systems