若执行信号量S操作的进程数为3,信号量S初值为2,当前值为一 1，表示有 个等待相关临界资源的进程。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30160' and id < 2440272 and id<>'2440272' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30160' and id > 2440272 and id<>'2440272' order by id asc limit 5