The article analyzes three Redis inventory‑deduction locking strategies—exclusive lock, segmented lock, and lock‑free/key‑quantization—detailing their key structures, suitable scenarios, advantages, drawbacks, and also covers Lua‑script atomic decrement, async queue buffering, and local pre‑deduction techniques.
This article explains Java's AbstractQueuedSynchronizer (AQS) framework, covering its FIFO queue mechanism, lock acquisition and release processes for exclusive and shared modes, state handling, and the abstract methods developers must implement to build custom synchronizers.
This article explains how Zookeeper can be used to build distributed locks, detailing the implementation of exclusive locks and two variants of read‑write locks, complete with step‑by‑step processes, node structures, watcher mechanisms, and practical considerations for backend systems.
This article explains MySQL shared (S) and exclusive (X) row‑level locks, demonstrates their behavior with two concurrent sessions, shows how lock ordering can cause deadlocks, and provides practical tips for using InnoDB locking correctly.
