进程P1、P2、P3和P4的前趋图如下：
若用PV操作控制这儿个进程并发执行的过程，则需要设置4个信号量S1、S2、S3和S4，且信号量初值都等于零。下图中a和b应分别填写（ ），c和d应分别填写（ ）。
问题1选项
A.P（S1）P（S2）和 P（S3）
B.P（S1）P（S2）和 V（S1）
C.V（S1）V（S2）和P（S1）
D.V（S1）V（S2）和 V（S3）
问题2选项
A.P（S1）P（S2）和P（S4）
B.P（S2）P（S3）和P（S4）
C.V（Sl）V（S2）和V（S4）
D.V（S2）V（S3）和 V（S4）
正确答案及解析
正确答案
解析
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