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Key should point to the semaphore set key, which you want to open.
key应该指向想要打开的信号量集的key值。
youdao
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The semaphore cannot be set again.
无法再设置信号灯。
youdao
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The semaphore is set and cannot be closed.
已设置信号灯，无法关闭。
youdao
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The semaphore is set and cannot be closed.
已设置信号灯，无法关闭。
youdao