Lobster Programming
Oct 15, 2026 · Fundamentals
AQS Unveiled: State, CLH Queue, and Template Method in Java Concurrency
This article explains Java's AbstractQueuedSynchronizer (AQS) core model using a service counter analogy, detailing how the state variable and CLH queue manage thread synchronization, the template method pattern separating queuing logic from acquisition rules, and how LockSupport.park/unpark enable efficient thread blocking and waking, illustrated with ReentrantLock and CountDownLatch examples.
AQSAbstractQueuedSynchronizerCLH Queue
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