This will help to avoid the chance for resource contention that can severely degrade performance, or lead to a record dead lock condition.
这将有助于避免出现资源争用，资源争用可能会严重降低性能，或者会导致出现记录死锁情况。
Doing so awakens all the reader threads that were waiting on the condition variable _cond; the reader threads now implicitly compete for the mutex lock as and when it is released.
这么做会唤醒所有等待条件变量_ cond的读线程；读线程现在隐式地争夺互斥锁。
Priority inversion is a condition where a high-priority thread is blocked on a lock held by a low-priority thread.
优先级反转指的是阻塞高优先级线程的锁由低优先级线程持有。
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