试题与答案

假设系统中有三类互斥资源R1、R2 和R3,可用资源数分别为9、8 和5。在T0 时

题型:单项选择题

题目:

假设系统中有三类互斥资源R1、R2 和R3,可用资源数分别为9、8 和5。在T0 时刻系统中有P1、P2、P3、P4 和P5 五个进程,这些进程对资源的最大需求量和已分配资源数如下表所示。此时系统剩余的可用资源数分别为()。如果进程按 () 序列执行,那么系统状态是安全的。

此时系统剩余的可用资源数分别为()

A.P1→P2→P4→P5→P3

B.P2→P1→P4→P5→P3

C.P2→P4→P5→P1→P3

D.P4→P2→P4→P1→P3

答案:

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题型:完形填空

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小题7:A. take          B. spend         C. have

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小题10:A. nothing      B. everything    C. vehicles

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