有两种类型的 非递归锁：快的和慢的。

There are two types of non-recursive locks: fast and slow.

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可以通过两种方式(递归地或非递归地)的其中一种来请求锁。

A lock can be acquired in one of two ways, recursively or non-recursively.

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如果锁是以递归方式被请求，那么发出请求的线程已经持有了它。

If a lock is acquired recursively, the requesting thread already owns it.

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当调用如果线程已持有锁，增量递归层次一，并返回。如果线程没有等待直到主人锁释放锁。

When invoked if this thread already owns the lock, increment the recursion level by one, and return immediately. if thread doesn't own the lock it waits until owner release lock.

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当调用如果线程已持有锁，增量递归层次一，并返回。如果线程没有等待直到主人锁释放锁。

When invoked if this thread already owns the lock, increment the recursion level by one, and return immediately. if thread doesn't own the lock it waits until owner release lock.

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