What is the locking mechanism in concurrency and multithreading of Java functions?

The concurrency lock mechanism in Java achieves thread safety in a multi-threaded environment by ensuring safe access to shared resources. Lock mechanism types include: 1. synchronized keyword; 2. ReentrantLock; 3. ReadWriteLock. In the actual case, thread-safe access to the count variable is ensured by marking the counter method as synchronized. Additionally, Java provides other locking mechanisms such as AtomicReference, AtomicInteger, and ConcurrentHashMap.

Concurrency and multi-thread lock mechanism in Java functions

In a multi-threaded environment, ensure the security of access to shared resources Crucial. Locking mechanism plays a key role in Java, allowing threads to access these resources in an orderly manner.

Lock mechanism type

Java provides a variety of lock mechanisms:

• synchronized keyword: By Code blocks are marked synchronized, which ensures that only one thread can execute the block at the same time.
• ReentrantLock: This is a reentrant lock, which means that it can be reacquired multiple times in the thread holding the lock.
• ReadWriteLock: This is a read-write lock that allows multiple threads to read resources at the same time, but only one thread can write to the resource.

Practical case: Thread-safe counter

Consider the following counter example:

public class Counter {

    private int count;

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

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

By passing increment() and getCount() methods are marked synchronized so that we can ensure that access to the count variable is thread-safe.

Other locking mechanisms

##помимо

synchronized, ReentrantLock and ReadWriteLock, Java also provides Other locking mechanisms, including:

• AtomicReference: It is an atomic reference, allowing the reference to be updated atomically.
• AtomicInteger: It is an atomic integer that allows integers to be updated atomically.
• ConcurrentHashMap: It is a concurrent hash table that allows thread-safe access to key-value pairs.

The above is the detailed content of What is the locking mechanism in concurrency and multithreading of Java functions?. For more information, please follow other related articles on the PHP Chinese website!