页式虚拟存储管理中地址转换和缺页中断的模拟、司机售票员问题：

编程用fork()创建一个子进程代表售票员，司机在父进程中，再用系统调用signal()让父进程（司机）捕捉来自子进程（售票员）发出的中断信号，让子进程（售票员）捕捉来自（司机）发出的中断信号，以实现进程间的同步运行。-Virtual storage management page address translation and page fault simulation, the driver conductor problem: Programming with the fork () creates a child process on behalf of the conductor, the driver in the parent process, then the system call signal () to the parent process (drivers) capture from the child process (conductor) issued the interrupt signal to the child process (conductor) capture from the (driver) issue an interrupt signal to achieve synchronization between processes running.