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【简答题】
桌子上有一个空盘子,允许存放一只水果。爸爸可向盘中放苹果,也可以向盘子中放橘子,儿子专等吃盘子中的橘子,女儿转等吃盘中的苹果。规定当盘子空时一次只能放一只水果供吃者取用,请用 P 、 V 原语实现爸爸、儿子、女儿三个并发进程的同步。
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A.
worked
B.
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had worked
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A.
had been never
B.
has never been
C.
never was
D.
had never been
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