进程P1、P2、P3、P4和P5的前趋图如下图所示：
若用PV操作控制进程P1、P2、P3、P4和P5并发执行的过程，则需要设置5个信号S1、S2、S3、S4和S5，且信号量S1～S5的初值都等于零。下图中a和b处应分别填（ ）；c和d处应分别填写（ ）；e和f处应分别填写（ ）。
问题1选项
A.V（S1）P（S2）和V（S3）
B.P（S1）V（S2）和V（S3）
C.V（S1）V（S2）和V（S3）
D.P（S1）P（S2）和V（S3）
问题2选项
A.P（S2）和P（S4）
B.P（S2）和V（S4）
C.V（S2）和P（S4）
D.V（S2）和V（S4）
问题3选项
A.P（S4）和V（S4）V（S5）
B.V（S5）和P（S4）P（S5）
C.V（S3）和V（S4）V（S5）
D.P（S3）和P（S4）V（P5）
正确答案及解析
正确答案
解析
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