javautilconcurrentCyclicBarrier

java.util.concurrent.CyclicBarrier is a synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point. Once all threads have reached the barrier, they are all released simultaneously. A CyclicBarrier is created with a specified number of parties, representing the number of threads that must invoke the barrier.

When a thread calls the await() method on a CyclicBarrier, it blocks until all other parties have also called await(). Upon reaching the barrier, the last thread to arrive can optionally perform an action before the other threads are released. This is achieved by passing a Runnable command to the CyclicBarrier's constructor.

The barrier is reusable. After all threads are released, the barrier resets and can be used again for subsequent synchronization points. This makes it suitable for multi-stage computations where threads need to synchronize at the end of each stage before proceeding to the next.

CyclicBarrier is particularly useful in parallel programming scenarios where tasks are divided among multiple threads. It ensures that no thread proceeds to the next phase of processing until all threads have completed the current phase. This prevents race conditions and ensures data consistency across threads.

Unlike CountDownLatch, which is a one-time event, CyclicBarrier can be reset and reused. It is a powerful tool for coordinating the execution of threads that need to synchronize at multiple points during their operation.