十四 真经之过桥问题[2]

The PV code Using Pascal

var loadnorthsouth:semaphore;

load=;

north=;

south=;

GO_South()

P(load);

P(north);

过北段桥;

到桥中间;

V(north);

P(south);

过南段桥;

到达南岸;

V(south);

V(load);

GO_North()

P(load);

P(south);

过南段桥;

到桥中间

V(south);

P(north);

过北段桥;

到达北岸

V(north);

V(load);

返回《操作系统之PV金典》

[] [] [] [] [] [] [] []

上一篇：十四 真经之过桥问题[3]

下一篇：1.2.1 单项选择题[5]