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To signal an event, semop is used with sem_op value as 1.
要将某个事件的状态修改为有信号状态，可以使用semop，并将sem_op的值设置为1。
youdao
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If sem_op is set to 0, semop will wait for semval to become 0.
如果sem_op被设置为0，那么semop就会等待semval变成0。
youdao
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If sem_op is set to 0, semop will wait for semval to become 0.
如果sem_op被设置为0，那么semop就会等待semval变成0。
youdao