理发师：
do
{
Wait(Scuthair);                               //检查是否有顾客，无，就睡眠

}while(1);
顾客：
wait(Snumchair);                            //申请占用椅子

signal(Scuthair);                           //给理发师发一个信号

Semaphore Scuthair,Mutexchair;

int number=0;                                  //顾客的共享变量