它是内核启用的第一个进程，可以对网络活动，计时器，或者其他进程的请求作出反应，运行任务。

It is the first process to be started by the kernel and can run tasks in response to network activity, timers, or when required by others.

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最后，当你的计时器达到终点的时候，任务就会立即执行。

And finally, once your timer has reached its end, the task will be carried out automatically.

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任务节点计时器触发调用的超时处理器(清单16)。

Timeout handler (Listing 16) is invoked when a task node timer is fired.

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