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[JAVA concurrent programming practice] 10. concurrent program testing and java practice1. Generate a random number
Package cn. study. concurrency. ch12; public class Util {public static int xorShift (int y) {// shift left and unsigned right, and last XOR operation (XOR, if the two bits are different, the value is 1; o
[JAVA concurrent programming practice] 9. Lock segmentation and java practice
Package cn. study. concurrency. ch11;/*** lock segmentation * @ author xiaof **/public class StripedMap {// synchronization policy: locks the array in segments, n nodes use the n % LOCKS lock to pr
write operation is volatile also called a variable rule before the next read Operation volatile .
Any operation within a thread must be called after the start () Call of this thread, also known as the thread initiation rule.
A thread terminates the rule before all operations on a thread are terminated.
The end operation of an object must also be called an object finalization rule after the object is constructed.
Transitivity
I strongly recommend that you read the 16th chapt
execute read operations and write operations can also concurrently access map, and allow a certain number of write operation threads to modify map concurrently, therefore, it can achieve higher throughput in a concurrent environment. In addition, concurrent containers provide some composite operations that need to be implemented by themselves when using synchronous containers, including putIfAbsent, but because concurrent containers cannot exclusively access through locking, we cannot implement
Why concurrency is requiredConcurrency is actually a decoupling strategy that helps us to separate what we do (the target) and when we do it (timing). Doing so can significantly improve the throughput of the application (getting more CPU scheduling time) and structure (multiple parts of the program are working together). As anyone who has ever done Java Web Development knows, the servlet program in the
Deep understanding of Java Virtual Machine: JVM advanced features and best practices (in-depth analysis of JVM Based on issues such as memory management and high concurrency)
Provides a comprehensive and in-depth analysis of JVM based on core content such as memory management, execution subsystem, programming compilation and optimization, and efficient concurrency
initializationSummary:Finally, the book is pretty much the same .... It's not easy to shout, but finally one more thing. This book probably now only understand about half, after all, only looked at once, poor translation quality for the book's reading added a lot of difficulty. In addition, the book theory is more than practice, the code practice is not much, the book has a lot of prerequisite knowledge is
An article reads Java concurrency and thread security, and understands java concurrent threads
I. Preface
For a long time, I have been trying to analyze the essence of Java thread security. However, I had to put it on hold because I had some micro-points that I couldn't understand, all the points are connected in a ser
In general development, I often see many students in the Java Concurrent development model will only use some basic methods. Like volatile,synchronized. High-level contracts such as lock and atomic are not often used by many people. I think most of the reasons are due to the nature of the principle. In the busy development work, who will be able to accurately grasp and use the correct concurrency model?
So
Transferred from: http://blog.csdn.net/zhangzeyuaaa/article/details/44542161Java's approach to designing databases in high-concurrency high-load Web sites (Java tutorials, Java processes large amounts of data, Java high-load data)One: high-concurrency high-load web site focu
The Java.util.concurrent package (J.U.C) after Java5 is the work of the world-class concurrent Master Doug Lea, which mainly implements
The corresponding atomic class of Integer/long in atomic package is mainly based on CAS;
Some of the same steps, including Lock,countdownlatch,semaphore,futuretask, are based on the Abstractqueuedsynchronizer class;
About the executors class of thread execution, etc.;
Some concurrent collection classes, such as Concurrenthashmap,concurrentl
[Practical Java high concurrency Program Design 7] Let threads help each other-Implementation of SynchronousQueue and synchronousqueue
[Practice: Java high concurrency Program Design 1] pointer in Java: Unsafe class
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In general development, I often see many students in the Java Concurrent development model will only use some basic methods. Like volatile,synchronized. High-level contracts such as lock and atomic are not often used by many people. I think most of the reasons are due to the nature of the principle. In the busy development work, who will be able to accurately grasp and use the correct concurrency model?So r
tasks refuse to be interrupted, which makes them non-canceled. However, even non-canceled tasks should attempt to preserve the interrupt state, in case the code at the higher level of the call stack needs to process the interrupt after the non-canceled task ends. The following code shows a method that waits for a blocking queue until an available item appears in the queue, regardless of whether it is interrupted. To make it easier for others, it resumes the interrupt state in a finally block af
lock: When multiple threads are waiting for the same lock, they must be queued in the order in which they are requested, while non-fair locks do not guarantee this, and any thread that waits for a lock has a chance to acquire a lock when the lock is released. Synchronized locks are not fair when locked, Reentrantlock is also an unfair lock by default, but you can require a fair lock by constructing method Reentrantlock (ture).3. Locks can bind multiple conditions: The Reentrantlock object can b
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
Java Concurrency structureOriginal link: http://gee.cs.oswego.edu/dl/cpj/mechanics.htmlContent
Thread
Synchronous
Monitor
ThreadA thread is a sequence of calls that are executed independently, and the threads of the same process share some system resources (such as file handles) at the same time to access the object resources (memory resources) created by the same process. The Java.lan
Mainly talk about the performance of the lock and some other theoretical knowledge, the main source of the content is "Java Concurrency in Practice", combined with their own understanding and practical application of the lock mechanism to a small summary.One of the first things to emphasize is that all locks (including built-in locks and advanced locks) are perfo
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