If the current thread is the holder of this lock then the hold count is decremented. If the hold count is now zero then the lock is released. If the current thread is not the holder of this lock then {@link IllegalMonitorStateException} is thrown.
Warning:
This method uses hashCode and equals of binary form of the key, not the actual implementations of hashCode and equals defined in key's class. @param key key to lock. @throws NullPointerException if the specified key is null @throws IllegalMonitorStateException if the current thread does not hold this lock
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