It makes the compilation thread operate at a lower priority than RT tasks and is tuned to avoid generating code with severely nondeterministic performance effects.
使编译线程以低于RT任务的优先级操作，并且作出了调整以避免生成带有严重的不确定性性能影响的代码。
2
The shorter the time a thread holds a given lock, the lower the probability that another thread will request it while the first thread is holding it.
一个线程占用一个给定锁的时间越短，另一个线程在该线程仍占用锁时请求该锁的可能性就越小。
3
Thread.yield yields execution only to a thread at the same priority and never yields execution to a thread with a higher or lower priority.