单选

●若有一个仓库，可以存放P1、P2两种产品，但是每次只能存放一种产品，要求：
①w=p1的数量-p2的数量②-i
若用PV操作实现P1和P2产品的入库过程，至少需要 (51) 同步信号量及 (52) 个互斥信号量，其中，同步信号量的初值分别为 (53) ，互斥信号量的初值分别为 (54) 。
(51)

A．1 &n
bsp; B．2
C．3
D．4 (52) A．1
B．2
C．2
D．4 (53) A．0
B．i，k，0
C．i，k
D．i-1，k-1 (54) A．1，1，l
B．1，1
C．1
D．i，k

试题出自试卷《2011年程序员考试考前密卷（六）-上午试题》

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