设备驱动模式，在设备须要内核关注时，由设备主动发送一个硬件信号(通常是通过一个中断)给内核。
Driven on the device side. The device sends a hardware signal (by generating an interrupt) to the kernel when it needs the kernel's attention.
当一个进程挂掉了(例如BIF失败或者模式匹配失败)，退出信号将发送给所有和该失效进程相关的其他进程。
When a process crashes (e. g. failure of a BIF or a pattern match) Exit Signals are sent to all processes to which the failing process is currently linked.
现场装定飞行模式航迹数据，实时修正飞行轨迹，定时发送遥测、控制信号。
Flight path data was loaded on spot, and the flight orbit was revised in real time, remote measurement and control signal was sent out.
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