某企业生产流水线M共有两位生产者，生产者甲不断地将其工序上加工的半成品放入半成品箱，生产者乙从半成品箱取出继续加工。假设半成品箱可存放n件半成品，采用PV操作实现生产者甲和生产者乙的同步可以设置三个信号量S、S1和S2，其同步模型如下图所示。
信号量S是一个互斥信号量，初值为（ ）；S1、S2的初值分别为（ ）。
问题1选项
A.0
B.1
C.n
D.任意正整数
问题2选项
A.n、0
B.0、n
C.1、n
D.n、1
正确答案及解析
正确答案
解析
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