After all of the threads are started, plus a 30 second wait, the timer is started.
所有线程已启动后，将等待30秒再启动计时器。
Setting AllowOverwrite to true will always allow the second control message to be processed, regardless of the state of the timer.
将AllowOverwrite设置为true，会始终允许处理第二条控制消息，而不会考虑计时器的状态如何。
The second thread can interact with the Event thread by using a staging area and a timer.
第二个线程可以通过一个中间区域(staging area)和一个计时器，与EventThread进行交互。
Your code can set a five-second timer and continue, say, redrawing the screen.
您的代码可以设置一个五秒钟的定时器，接下来继续进行重绘屏幕等操作。
For example, a timer frequency of 2 million ticks per second equals a timer resolution of 500 nanoseconds per tick.
例如，如果计时器频率为每秒2百万个计时周期，则相当于计时器分辨率为每个计时周期500毫微秒。
For example, a timer frequency of 2 million ticks per second equals a timer resolution of 500 nanoseconds per tick.
例如，如果计时器频率为每秒2百万个计时周期，则相当于计时器分辨率为每个计时周期500毫微秒。
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