CountDownLatch
Explore how CountDownLatch works as a synchronization aid in Java concurrency, allowing threads to wait for other threads to finish their tasks before proceeding. Discover practical usage through examples with worker and master threads to manage execution order effectively.
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Explanation
CountDownLatch is a synchronization primitive that comes with the java.util.concurrent package. It can be used to block a single or multiple threads while other threads complete their operations.
A CountDownLatch object is initialized with the number of tasks/threads it is required to wait for. Multiple threads can block and wait for the CountDownLatch object to reach zero by invoking await(). Every time a thread finishes its work, the thread invokes countDown() which decrements the counter by 1. Once the count reaches zero, threads waiting on the await() method are notified and resume execution.
The counter in the CountDownLatch cannot be reset making the CountDownLatch object ...