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.
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.
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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