M个生产者，N个消费者共享长度为L的有界缓冲区，则对缓冲区互斥操作而设置的信号量的初值应设为 。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30161' and id < 2440286 and id<>'2440286' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30161' and id > 2440286 and id<>'2440286' order by id asc limit 5