初始化

var waiting : integer; /*等候理发的顾客数*/
CHAIRS:integer; /*为顾客准备的椅子数*/
customers, barbers，mutex : semaphore;
customers := 0; barbers := 0; waiting := 0; mutex := 1;

理发师进程：
[cpp] view plain copy print?
Procedure barber;
begin while(TRUE); /*理完一人,还有顾客吗?*/
P(cutomers); /*若无顾客,理发师睡眠*/
P(mutex); /*进程互斥*/
waiting := waiting – 1; /*等候顾客数少一个*/
V(barbers); /*理发师去为