Think of this as a specialized version of the C library function select, but for DMA transfers.

可以把它看作 C 库函数 select 的特殊版本，但是针对的是 DMA 传输。

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To Invoke an Application-Supplied Algorithm The C runtime library function qsort sorts an array of objects, but you must supply the function that compares objects.

调用应用程序提供的算法：C 运行时库函数 qsort 排序对象数组，但你必须提供比较函数。

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