设计一个按时间片轮转法实现处理器调度的程序

[提示]：

（1）假定系统有5个进程，每个进程用一个PCB来代表。PCB的结构为：

• 进程名——如Q1~Q5。

• 指针——把5个进程连成队列，用指针指出下一个进程PCB的首地址。

• 要求运行时间——假设进程需要运行的单位时间数。

• 已运行时间——进程已运行的单位时间数，初始值为0。

• 状态——假设两种状态，就绪和结束，用R表示就绪，用E表示结束。初始状态都为就绪状态。

(2) 每次运行之前，为每个进程任意确定它的“要求运行时间”。

(3) 把5个进程按顺序排成循环队列，用指针指出队列连接情况。用一个标志单元记录轮到运行的进程。处理器调度总是选择标志单元指示的进程运行，对所指的进程，将其“已运行时间”加1。

(4) 进程运行一次后，若“要求运行时间”等于“已运行时间”，则将状态改为“结束”，退出队列，否则将继续轮转。

(5) 若就绪队列为空，结束，否则转到(3)重复。

-design of a time-Web Method processor activation procedures [Note] : (1) The system has five processes, with each process on behalf of a PCB. PCB structure : # 8226 from the process -- as Q1 ~ Q5. Pointer # 8226 -- put five linked queue process, with a target that the process of PCB under the first address. # 8226 requested the running time -- the assumption that the process needs to run the unit time. # 8226 has been in operation for the time -- the process has been in operation for the number of time units, the initial value of 0. # 8226 state -- two hypothetical state, and end in place, ready with R, E said an end. For the initial state of readiness. (2) Before each operation, for each process arbitrarily defined its "run-time requirements." (3) the five sequential process que