The alarm thread, being a high-priority RT thread, preempts any other lower-priority thread, and the GC thread also runs at an RT priority.
alarm线程是一个高优先级rt线程，它会抢占任何其他具有较低优先级的线程，而gc线程仍然以RT优先级运行。
The alarm thread, being a high-priority RT thread, preempts any other lower-priority thread, and the GC thread also runs at an RT priority.
alarm线程是一个高优先级rt线程，它会抢占任何其他具有较低优先级的线程，而gc线程仍然以RT优先级运行。
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