暂停的线程和状态机都可以捕获执行状态。
Suspended threads and state machines can both capture execution state nicely.
当前运行队列中线程的数目。代表线程处于可运行状态，但CPU还未能执行。
The amount of threads in the run queue. These are threads that are runnable, but the CPU is not available to execute them.
当前运行队列中线程的数目。代表线程处于可运行状态，但CPU还未能执行。
The amount of threads in the run queue. These are threads that are runnable, but the CPU is not available to execute them.
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