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Blocking queue LinkedBlockingQueueintroduceThe previous article introduces the non blocking queue concurrent linkedqueue implemented by CAS algorithm, and this article introduces the blocking queue LinkedBlockingQueue implemented by exclusive lock.The class diagram shows that the LinkedBlockingQueue is also implemented using a one-way linked li ...

summary When we introduced AQS, they were basically exclusive locks (mutual exclusion locks). These locks only allowed one thread to access at the same time, while read-write locks allowed multiple threads to access at the same time. When the read operation is much higher than the write operation, the read-write lock is used to make the read- ...

juc concurrent programming Introduction to juc java.util .concurrent, Java and contract Written examination questions Handwriting singleton modeHandwritten bubble sortingProducer consumer variants Process / thread review What is a process / thread? **Process: * * process is a running activity of a program with certain independent fun ...

Exclusive lock ReentrantLock principleintroduceReentrantLock is a reentrant exclusive lock. At the same time, only one thread can acquire the lock. Other threads acquiring the lock will be blocked and put into the AQS blocking queue of the lock.It has the same basic behavior and semantics as synchronized, but ReentrantLock is more flexible and ...

6. Membership method 6.1 some auxiliary methods spread(int h) method This method is used to calculate the hash value of Node nodes. When calculating the hash value, the high order of h is also used to make the Hash list more scattered. // 0x7fffffff is converted to binary, which is 11111111111111111111111111111111111111111111111111111111111 ...

1, ArrayList is not secure 1. Fault phenomenon public class NotSafeDemo { public static void main(String[] args) { List<String> list = new ArrayList(); for (int i = 0; i < 30; i++) { //Multiple threads modify the collection at the same time new Thread(() -> { //Add conte ...

Reference articles 1. What is ThreadLocal? And its general purpose (1) Definition (2) function ThreadLocal is used to provide local variables for internal use in threads. In other words, it uses a set of mechanisms to ensure that you create a new variable ThreadLocal. In a thread, set the ThreadLocal variable to an instance a of type A th ...

AQS resolution of abstract synchronization queueAQS - underlying support for locksAbstractQueuedSynchronizer Abstract synchronization queue is called AQS for short. It is the basic component to implement the synchronizer, and the underlying lock in the contract is implemented using AQS. Let's take a look at the class diagram structure of AQS.It ...

1, Inter thread communication There are two models of inter thread communication: shared memory {and} message passing. The following methods are implemented based on these two models. When the thread start() method is called, it is scheduled by the operating system, and the execution order is not fixed. If you want threads to execute in the req ...

JUC is Java util. Concurrent package, commonly known as JUC, contains some things to solve concurrency problems.This package is located under the rt.jar package under javaFour common concurrent tool classes:CountDownLatchCountDownLatch is a class I use more at present. A count will be given during the initialization of CountDownLatch, and then ...