一旦接收到了转储数据的信号，将使用 is_dumping 全局变量禁止其他的线程更改该缓冲区的内容。
The is_dumping global variable is used to stop other threads from changing the contents of the buffer once a signal has been received to dump data.
一旦驱动程序接收到坐标，它就将有关触摸和任何可用数据的信号发送给用户应用程序，并将数据发送给应用程序(如果可能的话)。
Once the driver receives the coordinates, it signals the user applications about the touch and the availability of any data, and sends the applications the data (if that is possible).
如果有个漫游机器人在火星表面有信息传回地球，机器人会先将数据保存起来，等到卫星绕到了可以接收信号的轨道范围再发送出去；
For example, if a rover on Mars needs to send data to Earth, it would first need to store the data until it was within range of an orbiting satellite.
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