线程可以因为各种各样的原因终止并进入可运行状态(因为堵塞)。
A thread might cease to runnable (that is, because blocked) for a variety of reasons.
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.
一旦被堵塞的线程进入可运行状态，它将会被放回适当的可运行池中。
When a blocked thread becomes runnable, it is placed back into the appropriate runnable pool.
该线程一直运行到它终止进入可运行状态（等待状态）或是另一个具有更高优先级的线程变成可运行状态。
This thread continues to run until it ceases to be runnable or another thread of higher priority becomes runnable.
该线程一直运行到它终止进入可运行状态（等待状态）或是另一个具有更高优先级的线程变成可运行状态。
This thread continues to run until it ceases to be runnable or another thread of higher priority becomes runnable.
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