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Today, I will talk to you about the in-depth discussion on how to carry out Java multithreaded synchronization mechanism, which may not be well understood by many people. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

In the minds of many programmers, Java multithreading will occupy a certain position. As we all know, in Java multithreaded programming, a very important aspect is the synchronization of threads. With regard to thread synchronization, there are generally the following solutions:

1. Add the synchronized keyword to the method signature of the method that needs synchronization.

two。 Use synchronized blocks to synchronize code snippets that need to be synchronized

3. Use the Lock object in the java.util.concurrent.lock package provided in JDK 5.

In addition, in order to solve the security problems that may occur when multiple threads access the same variable, we can not only use the synchronization mechanism, but also use the ThreadLocal added in JDK 1.2 to ensure better concurrency.

In this article, we will discuss the multi-thread synchronization mechanism of Java in detail and discuss ThreadLocal.

Thread comes first come first served

Let's take an example of Dirty: the bathroom in a restaurant is so small that it can only accommodate one person to go to the toilet. In order to ensure that they will not be disturbed, people who go to the toilet to enter the bathroom should lock the door. We can think of the bathroom as a shared resource, and many people who need to go to the toilet can be seen as multiple threads. If the bathroom is currently occupied, others must wait until the person has finished going to the toilet, opens the door and comes out. This is like when multiple threads share a resource, it must be first-come-first-served.

The related Mechanism of Java Multithreading

Common traps in Java multithreaded programming

Methods not advocated in practical Java multithreaded programming

Deep and simple Java multithreaded programming

Beginner Java Multithreading: introduction to Thread

Some people say: what if I don't have this door? How good is it to let the two threads compete with each other, and the one who takes the lead can do the work first? But we know: if there is no door to the toilet, people who go to the toilet will flock to the toilet, then disputes will inevitably occur, the normal steps of going to the toilet will be disrupted, and unexpected results may occur. For example, some people may be forced to fertilize in incorrect places.

It is precisely because of this door that anyone who enters the toilet alone can successfully complete their toilet-going process without being disturbed or even other results. That is to say, when you go to the toilet, you should pay attention to come first and arrive later.

So in Java multithreaded programs, when multiple threads compete for the same resource, how to ensure that they will not have a "fight" situation? Some people say that the synchronization mechanism is used. Yes, like the example above, it is a typical synchronization case. Once the first person starts to go to the toilet, the second person must wait for the first person to finish before he can start his toilet going process. Once a thread enters a process, it must wait for a normal return and exit the process before the next thread can start the process. Here, the most important thing is the bathroom door. In fact, the bathroom door plays the role of resource lock, as long as the toilet user locks the door, it is tantamount to obtaining the lock, and when he opens the lock, it is equivalent to releasing the lock.

After reading the above, do you have any further understanding of how to carry out the in-depth discussion of Java multithread synchronization mechanism? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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