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Define ownable synchronizer in Java thread.

An ownable synchronizer is a synchronizer that may be exclusively owned by a thread and uses AbstractOwnableSynchronizer (or its subclass) to implement its synchronization property.

ReentrantLock and ReentrantReadWriteLock are 2 examples of ownable synchronizers provided by the platform.

To detect deadlock in ownable synchronizers, ReentrankLock or ReentrantReadWriteLock, make sure to use findMonitorThreads method.

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