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This article mainly introduces "the use of ReentrantReadWriteLock class in Java". In daily operation, I believe many people have doubts about the use of ReentrantReadWriteLock class in Java. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "the use of ReentrantReadWriteLock class in Java". Next, please follow the editor to study!

The difference between ReentrantReadWriteLock and ReentrantLock:

ReentrantLock: only one thread can execute the code behind ReentrantLock.lock () at a time, which ensures thread safety, but the program is relatively inefficient.

ReentrantReadWriteLock: there are two kinds of locks, that is, there are read and write locks respectively. When you do not need to manipulate instance variables, you can use read locks, and when operating instance variables, use write locks, which can improve the efficiency of the program.

Shared lock: reading related locks is called shared lock.

Exclusive lock: writing related locks is called exclusive lock.

Let's first take a look at the shared lock:

We see that two threads execute asynchronously, which is the advantage of sharing locks. Multiple threads can execute the code behind the lock () method at the same time, improving the execution efficiency of the program. Let's take a look at the exclusive lock:

Let's see that the output is executed synchronously. This is also a feature of exclusive locks. If there are operations on instance variables in the thread, exclusive locks can be used to ensure thread safety.

Shared locks and exclusive locks are also mutexes. This means that if the thread has acquired the shared lock but the program has not finished executing, then other threads cannot acquire the exclusive lock and can only wait for the shared lock to be released.

At this point, the study on "the use of ReentrantReadWriteLock classes in Java" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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