What thread synchronization mechanisms have you used in your projects?

In Java projects, I used the following mechanisms for thread synchronization:

• The synchronized keyword — for locking methods or code blocks to ensure exclusive access to shared resources.

• Classes from the java.util.concurrent package:

  • ReentrantLock — a more flexible alternative to synchronized with try-lock and timeout capabilities.
  • CountDownLatch, Semaphore, CyclicBarrier — for coordinating the work of multiple threads.
  • ConcurrentHashMap — a thread-safe collection for parallel access.

• Volatile variables — to ensure visibility of variable changes between threads without full locking.

Example of using synchronized:

public class Counter {
    private int count = 0;

    public synchronized void increment() {
        count++;
    }

    public synchronized int getCount() {
        return count;
    }
}