Can you list different types of locking mechanisms used in multithreaded programming?

In multithreaded programming in Java, different locking mechanisms are used to synchronize access to shared resources:

• synchronized — an built-in locking mechanism that can be applied to methods or code blocks. It uses the object's monitor.
• ReentrantLock from the java.util.concurrent.locks package — a more flexible lock with the ability to interrupt, timeout, and check its state.
• ReadWriteLock — allows separating locks for reading and writing, which improves performance with a high number of read operations.
• Semaphore — limits the number of threads that can access a resource simultaneously.
• CountDownLatch and CyclicBarrier — for thread coordination, although these are not classic locks but synchronizers.

Example of using ReentrantLock:

import java.util.concurrent.locks.ReentrantLock;

ReentrantLock lock = new ReentrantLock();

lock.lock();
try {
    // critical section
} finally {
    lock.unlock();
}