- A.P(S4)和V(S5)
- B.V(S5)和P(S4)
- C.V(S4)和P(S5)
- D.V(S4)和V(S5)
正确答案及解析
正确答案
解析
图中有五条箭线，因此需要设置五个信号量，按照从小到大的顺序分别是：P1→P2是S1，P2→P3是S2，P2→P4是S3，P3→P4是S4，P4→P5是S5。每个进程开始的时候执行P操作（P1没有P操作，只有V操作），结束的时候执行V操作，如P2开始的时候执行P（S1）的操作，结束时执行V（S2）的操作。其他同理。
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