❶ 操作系统信号量和PV操作问题，求大神，不要复制
bridge=1，mutex1=1，mutex2=1,s1=1，s2=1Process 东(){P(mutex2)P(bridge){过桥}s2=0if(s1==0){ V(mutex1) s1=1 }V(bridge)}Process 西(){P(mutex1)P(bridge){过桥}s1=0if(s2==0){ V(mutex2) s2=1 }V(bridge)}