题目详情

前趋图(Precedence Graph)是一个有向无环图,记为:→={(Pi,Pj)|Pi must complete before Pj may strat},假设系统中进程P={P1,P2,P3,P4,P5,P6,P7,P8},且进程的前驱图如下

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那么前驱图可记为:()

  • A.={(P1,P2),(P3,P1),(P4,P1),(P5,P2),(P5,P3),(P6,P4),(P7,P5),(P7,P6),(P5,P6),(P4,P5),(P6,P7),(P7,P6)}
  • B.={(P1,P2),(P1,P3),(P2,P5),(P2,P3),(P3,P4),(P3,P5),(P4,P5),(P5,P6),(P5,P7),(P8,P5),(P6,P7),(P7,P8)}
  • C.={(P1,P2),(P1,P3),(P2,P3),(P2,P5),(P3,P4),(P3,P5),(P4,P6),(P5,P6),(P5,P7),(P5,P8),(P6,P8),(P7,P8)}
  • D.={(P1,P2),(P1,P3),(P2,P3),(P2,P5),(P3,P6),(P3,P4),(P4,P7),(P5,P6),(P6,P7),(P6,P5),(P7,P5),(P7,P8)}

正确答案及解析

正确答案
C
解析

(Pi,Pj)表示前驱图的一个进程之间的逻辑关系,该图一共有12个逻辑关系。记为→={(P1,P2),(P1,P3),(P2,P3),(P2,P5),(P3,P4),(P3,P5),(P4,P6),(P5,P6),(P5,P7),(P5,P8),(P6,P8),(P7,P8)}。

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