real time timer 实时时钟
The interval for the timer event is calculated in real world time.
时间事件的间隔期是由现实世界的时间来计算的。
Although the simple timer API is easy and efficient, it does not offer the accuracy required for real-time applications.
尽管简单计时器api简单有效，但它并不能提供实时应用程序所需的准确性。
The design or a subset of it was implemented under several different Real Time Operating systems using RTOS specific message queues, semaphores and a timer interrupt.
设计以若干（种）使用RTOS特殊消息队列、消息发送及计时器中断的实时操作系统为基准。
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