block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.
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swap(&arr[low], &arr[randomIdx]); // 基准换到开头
Author(s): Cai-Fu Pan, Dong-Jie Wang, Wen-Lue Mao, Li-Xia Jia, Yan-Kun Dou, Jin-Li Cao, Xin-Fu He, Wen Yang