编写P、V操作和信号量的模拟程序，然后用它们解决不死锁的哲学家就餐问题，并把哲学家们的活动过程用文字或可视化表示出来。-Write P, V operation and the amount of signal simulation program, and then use them to solve the undead philosophers of the lock repast questions and to the process of the philosophers in wo