模拟操作系统的进程调度，事先构造一个PCB总链队列，可对该队列进行正常的维护，

即当PCB状态变化时，在总链队列的基础上，实现菜单式管理和进程原语操作，

实现创建、撤销、时间片到、挂起进程和激活进程等基本进程原语，

以实现PCB的就绪队列、等待队列的组织与管理；-

Simulation operating system process scheduling, advance to construct a chain of total PCB queue, the queue can perform normal maintenance,

　　　　That is when the PCB status changes in the queue on the basis of the total chain, menu management and processes to achieve primitive operations,

　　　　To achieve the creation, cancellation, time slice to, suspend the process and activation process and other basic processing primitives,

　　　　PCB to achieve the ready queue, waiting queue Organization and Management