该段代码为操作系统进程调度的算法分析，内含三种算法FCFS、SJF、时间片轮转，在程序结束之前会对三种算法进行简单的分析。-The sections of the code for the operating system process scheduling algorithm analysis, containing three algorithms FCFS, SJF, time slice rotation, a simple analysis is interested in the program before the end of the three algorithms.