Chapter s Operating System 5.1.1 Resource allocation and related functions Preemption of system resources is used by the Os to enforce fairness in their use by programs, or to realize certain system level goals. A preempted program cannot execute unless the preempted resource unit, or some other resource unit pi the same resource class. is allocated to it once again. The shorter term preemption is used preemption of the CPU, and the full term resource preemption is used for preemption of other resources 资源抢占是能指强行释放资源。操作系统依靠对系统资源的抢 占确保程序对资源的平等利用,或实现一些系统级的目标。对 于资源被抢占的程序来说,除非把被抢占的资源单位或同一资 源类的其他资源单位重新分配给它,否则无法继续执行。我们 称抢占CPU为抢占,而称抢占其他资源为资源抢占。 5-17Chapter 5 Operating System 计算机专业英语 5-17 Preemption of system resources is used by the OS to enforce fairness in their use by programs, or to realize certain system level goals. A preempted program cannot execute unless the preempted resource unit, or some other resource unit pi' the same resource class, is allocated to it once again. The shorter term preemption is used preemption of the CPU, and the full term resource preemption is used for preemption of other resources. 资源抢占是能指强行释放资源。操作系统依靠对系统资源的抢 占确保程序对资源的平等利用，或实现一些系统级的目标。对 于资源被抢占的程序来说，除非把被抢占的资源单位或同一资 源类的其他资源单位重新分配给它，否则无法继续执行。我们 称抢占CPU为抢占，而称抢占其他资源为资源抢占。 5.1.1 Resource allocation and related functions