The kernel registers the process/thread with the associated device's select function and puts the process/thread to sleep.

内核向相关设备的选择函数注册这个进程 /线程，并让这个进程 / 线程睡眠。

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Figure 6.42. The Select function used to conditionally switch between two possible outputs.

图6.42。选择函数，用于有条件地选择两个可能的输出。

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Figure 6.42. The Select function used to conditionally switch between two possible outputs.

图6.42。选择函数，用于有条件地选择两个可能的输出。

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