java concurrency course

This is a creation in Article, where the information may have evolved or changed. See the previous: Java, Scala, and go languages multi-threaded concurrency comparison test. Related code Download: http://qinhui99.itpub.net/resource/2570/31876Test results and conclusionsCount the number of prime numbers in a 1~n, and record the time spent. The same n, the less time performance the better. AMD Dual Core 2.8G,

"Practical Java High Concurrency Programming 1" Pointers in Java: unsafe class"Practical Java High Concurrency Programming 2" lock-free object reference: AtomicreferenceAtomicreference cannot solve the problem above all because the object is missing state information during

In the [high Concurrency Java II] Multithreaded Foundation, we have initially mentioned basic thread synchronization operations. This time, we will mention the synchronization control tool in the contract. 1. Use of various synchronization control tools 1.1 Reentrantlock Reentrantlock sense is synchronized's enhanced version, synchronized is characterized by the use of simple, all to the JVM to deal with

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Java Programming Class: 1352 Name: Lu Songhon No.: 20135229Score: Instructor: Lou Jia Peng Experimental Date: 2015.6.9Experiment level: Preview degree: Experiment time: 15:50--20:50Instrument Group: 29 Compulsory/Elective: Elective experiment number: 04Experimental Purpose:1. Mastering the

operation results have not been brushed back to the main memory, resulting in incorrect results, so must be guaranteed order.The nature of the order, then, is to ensure that only one CPU at a time can execute the critical section code. This is usually a lock-up, the nature of the lock is divided into two kinds: pessimistic lock and optimistic lock. such as the typical pessimistic lock synchronized, JUC package under the typical optimistic lock reentrantlock.To sum up: to ensure thread safety, y

It turns out that the benefits of multi-core hardware are difficult and risky. When using concurrency to write Java software correctly and securely, we need to think very carefully. Because error usage concurrency can lead to occasional defects that can even escape the most stringent test environments. The static analysis tool provides a way to detect and fix

Scenario: The thread pool is often encountered during an interview and there are more scenes in the work, so it is necessary to figure it out.1 IntroductionJava has joined the process of processing a batch of threads since 1.5, the executor in Java concurrency packages. This article mainly introduces the usage of Executorservice, the usage of runable and callable, and the usage of Executorcompletionservice

complete the service (Completionservice).Completionservice combines the functions of executor and blockingqueue. You can give the callable task to it for execution, and then use the take and poll methods similar to the queue operation to get the results that have been completed. Executorcompletionservice implements the Completionservice. Public classRender {Private FinalExecutorservice executor; PublicRender (Executorservice executor) {Super(); This. Executor =executor; } voidrenderpag

queues the current thread into the Aqs CLH queue (because the head node thread of the queue is most likely not the current thread when the first attempt is made. Of course, the same thread is not excluded to enter the semaphore for the second time, thereby obtaining the semaphore sequentially according to the order FIFO of the Aqs CLH queue, and for the non-fair semaphore, the first attempt immediately to get the semaphore, once the semaphore remaini

Exceeded");if (Compareandsetstate (c, C + shared_unit)) {Holdcounter RH = Cachedholdcounter;if (RH = = NULL | | Rh.tid! = current.getid ())Cachedholdcounter = RH = Readholds.get ();rh.count++;return true;}}} Listing 11 Writing the lock Trylock () Final Boolean trywritelock () {Thread current = Thread.CurrentThread ();int c = GetState ();if (c! = 0) {int w = Exclusivecount (c);if (w = = 0 | | Current! = Getexclusiveownerthread ())return false;if (w = = Max_count)throw new Error ("Maxim

Semaphore always queues the current thread into the Aqs CLH queue (because the head node thread of the queue is most likely not the current thread when the first attempt is made. Of course, the same thread is not excluded to enter the semaphore for the second time, thereby obtaining the semaphore sequentially according to the order FIFO of the Aqs CLH queue, and for the non-fair semaphore, the first attempt immediately to get the semaphore, once the

Java concurrency concepts, base interfaces, and thread This series of articles mainly on Java concurrency related content, including synchronization, lock, semaphore, blocking queue, thread pool, etc., the overall mind map is as follows: This paper mainly explains the concurrency