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Thread usage problems Frequent creation and destruction of threadsToo many threads will cause the overhead of CPU resources.Context switching (consuming CPU resources). Thread reuse Connection pool, object pool, memory pool, thread pool. The core of pooling Technology: reuse Thread pool Create a series of threads in advance and save t ...

preface Tip: when you read this article, you must have a strong desire to learn about multithreading. Then this article will describe in detail the simple use and in-depth understanding of Synchronized keywords, deadlocks, simple use in thread communication, waiting notification mechanism, thread lounge, producer and consumer operation v ...

Notes after reading the art of Java Concurrent Programming - 13 atomic operation classes in Java (Chapter 7) 1. Atomic update basic type class The Atomic package provides the following three classes for updating basic types in an Atomic way: AtomicBoolean: atomic update boolean typeAtomicInteger: atomic update integerAtomicLong: atomic u ...

In the last article, we introduced the basis of threading. I believe everyone has a general understanding. This article is about thread sharing and collaboration. Let's have a look! 1, Sharing between threads Synchronized synchronized is a keyword in Java. It is a kind of synchronous lock. It modifies the following objects: 　　1. Mod ...

Let's look at a piece of code and think about two questions Take these two questions to see the source code, get twice the result with half the effort! Why is it the fourth error? Why does the third execute first and the second execute later? Construction method analysis public ThreadPoolExecutor(int corePoolSize, ...

JUC Foundation 1. Tube side: monitor, monitor, lock It ensures that only one process is active in the pipe at the same time, that is, the operations defined in the pipe are called by only one process at the same time (implemented by the compiler) However, this does not guarantee that the processes are executed in the designed order Synchroni ...

Basic introduction Compared with synchronized, it has the following characteristics InterruptibleCan be set to fair lockYou can set the timeoutMultiple condition variables are supported, that is, threads that do not meet the conditions can be placed in different collections to wait Like synchronized, reentrant is supported Basic grammar ...

1. What is AQS2. What can I do3. Why is AQS the most important cornerstone of JUC content4.AQS internal architecture5. Interpret AQS from our ReentrantLock6. Summary 1. What is AQSAQS -- full name AbstractQueuedSynchronizer, abstract queue synchronizer.We can see the explanation in the source code:In other words, it is a heavyweight basic frame ...

brief introduction CountDownLatch is a thread synchronization tool provided by JUC. Its main function is to coordinate the synchronization between multiple threads, or to realize the communication between threads CountDown, a number, can only be counted down. Latch, latch. Just look at the name to see how this CountDownLatch is used. Ha ha. Cou ...

AQS adopts the standard template design mode and provides the following methods: // Exclusive Mode public final void acquire(int arg); public final boolean release(int arg); // Exclusive interruptible public final void acquireInterruptibly(int arg) throws InterruptedException; // Exclusive with timeout pub ...