谁能解析一下这一段加锁的代码？

Question

这是一段reentranLock加锁的代码。notFUll和notEmpty是lock的两个条件。我有点儿看不明白。当某一个线程到了lock.lock()时，如果它获得了锁进入里面，而此时正好count==items.length，进入了await()，它在等待。这不是死锁了吗？这时候，它还没有unlock()。

Answer 1

await 会释放锁

Answer 2

await

Causes the current thread to wait until it is signalled or interrupted.

The lock associated with this Condition is atomically released and the current thread becomes disabled for thread scheduling purposes and lies dormant until one of four things happens:
......

await 会自动解锁。

Answer 3

没看过java，不过这应该是条件变量吧？去看条件变量的wait操作，会unlock锁并block在这里，等待被唤醒，唤醒时首先会争夺锁，成功加锁后才能继续向下执行。