说明：  操作系统课程设计编程实例 1fork 2编制先来先执行进程调度算法 3读者 4模拟进程调度算法 5 虚拟存储器管理 6二级目录结构的磁盘文件系统
(courses on operating system design programming examples 1fork two first-come first-prepared implementation process scheduling algorithm three readers four scheduling algorithm modeling process virtual memory management 5 6 2 disk directory structure of the file system)