说明：  1． 实现对进程生命周期全过程的管理，包括进程的创建、撤销、执行、阻塞、唤醒、挂起、激活等。 2． 实现对多个进程并发执行的管理。
(1. Process to achieve the whole process of life-cycle management, including the process of the creation, revocation, execution, blocking, wake up, suspend, activate and so on. 2. Complicated by a number of processes to achieve the implementation of the management.)