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【单选题】
由两个并发执行的进程P1和P2,共享初值为1的变量x。P1对x加1,P2对x减1。加1和减1操作的指令序列分别如下 //加1操作 Load R1,1 1//取x到寄存器R1中 Inc R1 2 Store x,R1 3将R1的内容存入x //减1操作 Load R2,1 4//取x到寄存器R2中 Dec R2 5 Store x,R2 6将R2的内容存入x 两个操作完成后,x的值为( )A.
可能为-1或3
B.
只能为1
C.
可能为0、1或2
D.
可能为-1、0、1、2
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举一反三
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