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Understanding ReentrantLock The ReentrantLock class in Java provides a reentrant mutual exclusion lock with extended capabilities compared to the implicit locks used with synchronized methods and statements. A reentrant lock allows a thread to acquire the lock multiple times without causing a deadlock. Internal State Management The core of the ...

Java's AbstractQueuedSynchronizer (AQS) coordinates thread access to shared resources through a volatile integer state and a FIFO doubly-linked node structure. Concrete synchronizers built atop this framework include ReentrantLock, Semaphore, and CountDownLatch. The framework maintains two distinct node chains: a synchronization queue for threa ...