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Java / Java Multithreading

What is Reentrant lock in Java?

java.util. concurrent.locks ReentrantLock is a concrete implementation of Lock interface provided in Java concurrency package introduced in Java 1.5. ReentrantLock is a mutual exclusive lock with extended feature like fairness, which can be used to provide lock to longest waiting thread. ReentrantLock is similar to implicit locking provided by synchronized keyword in Java.

ReentrantLock allows the threads to enter into lock more than one time even if the thread is already holding lock. When first time thread enters into lock, hold count is set to one. Before unlock thread can re-enter into lock again and every time hold count is incremented by one. For every unlock request, hold count is decremented by one and when hold count is 0, it is unlocked.

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Java Multithreading part II

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