【单选题】【消耗次数：1】
如果进程Pa对信号量S执行P操作，则信号量S的值应（）。
①
加1
②
减1
③
等于0
④
小于0
参考答案：
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如果信号量S的值是0 , 此时进程A执行P（S）操作，那么，进程A会（ ）。
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