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我们睡 20 秒,既省电,又能保证醒来时有大量数据可读。

Floor 1 巨大八爪鱼 12/31/25 15:50
醒来后,一口气把积压的数据全读走
由于我们睡了很久,内核 FIFO 里肯定有很多数据了,read 会立即返回

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