java concurrency in practice

, asynchronous non-blocking three operation modes, respectively, corresponding to bio, NIO, AIO three types of API style.2, bio needs to ensure a connection to a thread, because the thread is a valuable resource of the operating system, not open too much, so bio severely restricts the number of concurrent connections that can be hosted on the server.3, the use of NIO characteristics, supplemented by reactor programming mode, Java in Linux to achieve h

processing of the processor may be quite different from the logical result of our code. For example, we perform a data write operation on a core and write a token at the end to indicate that the previous data is ready. Then from the other core by judging the mark to determine whether the required data is ready, there is a risk that the tag bit may be written first, and the data is not ready to complete, this is not completed can be either no calculation is completed, it is possible that the cac

An online 2k game, every second is scary. The traditional hibernate direct plug-in library is basically not feasible. I'm going to deduce a lock-free database operation in one step.1. How to lock in concurrency.A very simple idea to convert concurrency into a single thread. Java's disruptor is a good example. If you use the Java Concurrentcollection class to do, the principle is to start a thread, run a que

in the spin, and what happens each time the execution will affect the CLH queue.However, oneself also has the harvest, at least compared to at the beginning, oneself to the Aqs have a little fur understanding, not later smell completely is ask Sanbuzhi state.At the same time I also hope that this article will be able to understand the Aqs of the program Ape can play a role in the future, they will also be some of their own learning experience or information to share.ResourcesFang Fei: "The Art

can hold this lock at most. When thread a attempts to acquire a lock held by thread B, thread A must wait or block until thread B releases the lock. If B never releases the lock, then a will always wait for it to continue.2.3 Re-entry of the lockIf a thread attempts to acquire a lock that is already held by itself, the request succeeds. The re-entry further enhances the encapsulation of the locking behavior, thus simplifying the development of object-oriented

Learn Java concurrency programming have to understand java.util.concurrent this package, this package has many of the concurrency tools we often use, such as: Reentrantlock, Countdownlatch, Cyclicbarrier, Semaphore and so on. The underlying implementations of these classes depend on the Abstractqueuedsynchronizer class, which shows the importance of this class. S

The front-end time to learn Java concurrency notes, about 40 articles.1. Java Concurrency BasicsConcurrency Basics (i) Threading introductionConcurrency Basics (ii) API summary for the thread classConcurrency Basics (iii) Java thread precedenceConcurrency Basics (iv) Status

atomic operations of complex data types. Implement non-blocking of complex data typesAlgorithmThe key lies in how to limit the scope of atomic update to a simple variable while maintaining data consistency. For example, in a stack, each element node (value, next) points to only one other element, and each element is directed to only one other element. For the push method, a new node is created pointing to the top element of the stack, and Java. util.

This article translates from: Java concurrency–part 7:executors and thread pools Let's start by getting to know Java concurrency programming from a primer. This article describes how to start creating threads and managing the thread pool, in the Java language, a simplest thr

tasks.Java.util.TimerTask is an abstract class that implements the Runnable interface, and we need to inherit the class to create our own timed task and use the timer to schedule its execution.Here's an example of a Java timer.25. What is a thread pool? How do I create a Java thread pool?A thread pool manages a set of worker threads, and it also includes a queue that is used to place tasks that are waiting

handled by a worker Thread. That is: a total of 2 threads (the main thread, The worker thread that handles the task). For other classes, refer to the Java DOC 9 Concurrent Process ControlThis section of the example comes from a Java concurrency tutorial that is less warm and may change. Salute to the low temperature. Countdownlatch Door Latch counte

Java.util.concurrent.Exchanger Application Example and principle analysis--Reprint PackageThread;ImportJava.util.Random;ImportJava.util.concurrent.Exchanger;ImportJava.util.concurrent.ExecutorService;Importjava.util.concurrent.Executors; Public classExchangertest { Public Static voidMain (string[] args) {Executorservice Executorservice=Executors.newcachedthreadpool (); FinalExchangerNewExchanger(); Executorservice.execute (NewRunnabletest ("A", exchanger)); Executorservice.execute (NewRunnablete

An important feature of the Java language is the built-in support for concurrency, which makes Java very popular with businesses and programmers. At the same time, if you want to improve your own technology, Java concurrency knowledge is essential, here is a simple collation

In the previous few things about the Java memory model that basically explained the concept of the bottom of the domain, talk about high concurrency (35) Java memory model those things (iii) Understanding memory barriers This analysis of the X86 platform, Volatile,synchronized, CAS operations are implemented based on the assembly instructions of the lock prefix,

Java Multi-threading and concurrency---Learning summary (very detailed)1. Computer SystemsThe cache is used as a buffer between the memory and the processor, the data needed for the operation is copied into the cache, the computation can be made fast, and when the operation is finished, it is synchronized back to memory from the cache so that the processor does not have to wait for slow memory to read and w

JAVA concurrencyParallel programming in Java is complicated, and I don't understand it deeply. But recently, due to the parallel training of classifiers, pondering a little, there are errors please correct me. Just a rough introduction.Many problems we use sequential programming can be solved, but some problems if you can use multi-threaded parallel execution of the task of which can greatly improve the tim