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background I wrote an article on understanding AQS in depth earlier Thoroughly understand AQS After a period of time, I found that I couldn't remember some places clearly, and what I had written before was not good, so I didn't feel that I understood them thoroughly, so I decided to look for information again and thoroughly understand what I ...

Thread creation Inherit Thread class You can create a Thread by inheriting the Thread class and creating an object through new. public class MyThread extends Thread { private int count = 5; @Override synchronized public void run() { super.run(); count--; System.out.println("from " + this.curre ...

1, ABA problem ABA problem means that in a concurrent environment, assuming that the initial condition is a, when modifying data, it will be modified if it is found to be a. However, although we see a, there may be a change from a to B and B back to a. This a is not that A. even if the data is successfully modified, there may be problems Solu ...

Process and thread Process: The running program is an independent unit for the system to allocate and call resources. Each process has its own memory space and system resourcesThread: It is a single sequential control flow in a process, or a separate execution path If a process has only one execution path, it is called a single threaded progra ...

1. Deadlock Scenario: when thread a owns the lock of object a, it wants to obtain the lock of object B; Thread B owns the lock of object B and wants to own the lock of object A. when two threads acquire the lock, they will not release the lock already held. Therefore, deadlock is caused. Example code: @Slf4j public class ThreadTest { pri ...

1. Thread overview 1.1 threads and processes Process is a program in the running process and has certain independent functionsConcurrency: only one instruction can be executed at a time, but multiple process instructions are executed in rapid rotationParallelism: multiple instructions are executed simultaneously on multiple processorsA thread ...

####What is IntentService? IntentService inherits from Service, so IntentService is also one of the four major components. IntentService encapsulates the HandlerThread thread thread (only one thread) to process asynchronous tasks in sequence. Start IntentService through startService(Intent) and transmit asynchronous tasks through Intent. When ...

Java thread pool: Core configuration parameters of thread pool: //The timeout of a thread waiting for a task. It takes effect when the number of threads in the thread pool exceeds the corePoolSize. When the thread waiting for a task exceeds keepAliveTime, the thread pool will stop threads that exceed the corePoolSize. private volatile long ke ...

Multithreading has always been a difficulty in Java development and a frequent visitor in the interview. While there is still time, I intend to consolidate my knowledge of JUC. I think opportunities can be seen everywhere, but they are always reserved for those who are prepared. I hope we can all refuel!!! Sink and float up. I think we will b ...

JUC concurrency 1. What is JUC JUC is the toolkit, package and classification under java.util. Business: common thread code ThreadRunnable has no return value, and its efficiency is relatively lower than that of CallableCallable has a return value! 2. Threads and processes Threads, processes, if you can not use a word out tec ...