cas operation

This section describes several useful tools related to locks.Latching (Latch)Latching (Latch): A synchronous method that delays the progress of a thread until the thread reaches an endpoint state. In layman's words, a latch is equivalent to a door,

Author Multithreading total: http://www.cnblogs.com/xrq730/category/733883.htmlOriginal address:ObjectiveJava Multi-threaded classification has written 21 multi-threaded articles, 21 Articles of a lot of content, personally think, learning, the more

contents of concurrent packages in Java1, CyclicbarrierA synchronization helper class that allows a group of threads to wait for each other until the set of threads reaches a common barrier point. The barrier can be reused after releasing the

Thread 1. PriorityEach thread has a priority, and higher priority threads run first, which means that the probability is higher when allocating CPU time periods.When a new thread is created on a thread, the line threads the same priority as the

1 IntroductionIn multi-threaded concurrent programming, synchronized has always been an elder role, and many people will call it a heavyweight lock, but with the various optimizations that Java SE1.6 has made to synchronized, in some cases it is not

ObjectiveIn Java and the contract has such a package, java.util.concurrent.atomic, the package is the Java part of the data type of atomic encapsulation, on the basis of the original data type, provides an atomic operation method, to ensure thread

Principle of non-lock class 1.1 CASThe process of the CAS algorithm is this: it contains 3 parameters CAs (v,e,n). V represents the variable to be updated, E represents the expected value, and n represents the new value. The value of V is set to n

This is a complete Java concurrency collation note, which records some of my experiences and experiences in recent years of learning Java concurrency. J.U.C Overall understanding Atomic Operation Part 1 starting from Atomicinteger Atomic

1. Computer systemUse caching as a buffer between memory and processor, copying the data needed for the operation to the cache, allowing for rapid computation, and synchronizing back into memory from the cache when the operation is finished, so that

For example, there are two memcached modules in Pecl, Memcache and memcached, and most PHP environments use a memcache version with no d in the name, which is released earlier and is a native version, The corresponding memcached version with D is

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

Reference Documentation: Http://www.blogjava.net/xylz/archive/2010/07/04/325206.html Http://blog.hesey.net/2011/09/resolve-aba-by-atomicstampedreference.html Http://www.searchsoa.com.cn/showcontent_69238.htm http://ifeve.com/atomic-operation/ Http://

Add the Java.util.concurrent (J.U.C) package to JDK1.5, which is built on top of CAs. A common implementation of the CAS non-blocking algorithm, which has a better performance compared to the synchronized blocking algorithm. optimistic

First, Introduction Before we explain these lock concepts, we need to be clear that these locks are not equivalent to Reentratlock locks in the Java API, which are conceptually, the locking mechanisms that are created in JDK1.6 to optimize the

Talking about high concurrency (vi) Implementation of several spin locks (i) This article has implemented two basic spin locks: Taslock and Ttaslock, their problem is frequent CAS operations, triggering a lot of cache consistency traffic, resulting

"The total directory of Bowen >>>" "Java 7 concurrent Programming Combat manual directory >>>" The java.util.concurrent package is built entirely on CAS and will not have this package without CAs. The importance of CAs is visible. CAS Cas:compare

Introduction: I saw the use of lock yesterday when I was learning about the interview experience shared by others. Think of myself in the last interview also encountered the difference between synchronized and lock and use. So I sorted out the

, note: Piecemeal knowledge points sorted out only according to one's own understanding (slowly added) The implementation of synchronous locks in Java relies on the internal queue Synchronizer, which implements the method by which the queue

Recently began to learn the lock-free programming, compared with the traditional lock based algorithm, the lock-free programming has its unique advantages, Angel Lucifer of the article on the non-lock programming in detail. The goal of the

Deeply analyze the realization principle of volatileIntroduction Synchronized and volatile play an important role in multithreaded concurrent programming, and volatile is a lightweight synchronized that ensures the "visibility" of shared variables