The GC thread can also preemptively sleep if it can't complete its upcoming work item before the quantum end time.
如果gc线程无法在时间量结束前完成预定的任务项目，那么也可以抢占性地进入休眠。
Individual thread stacks must be scanned atomically, or within a single quantum.
单独线程栈必须自动进行扫描，或在单个时间量内扫描。
The time quantum given to a thread depends on the thread's assigned priority.
为线程提供的时间量取决于给线程指定的优先级。
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