cas operation

IconAs shown in the Red box section, I do stability testing, when the flume run a few days later, I found that the counter value gradually become larger, to a certain value, and then become smaller, there is a cycle of the process, and therefore the

Introduction to the implementation principle and application of the atomic package in Java, javaatomic 1. Proposal of synchronization problems Suppose we use A dual-core processor to execute two threads A and B, one is to execute thread A, and the

Thread Safety and lock optimization Thread Safety Thread safety in the Java language Not variable Relative Thread safety Absolute thread Safety Thread compatible

First introduce some optimistic lock and pessimistic lock:Pessimistic lock: Always assume the worst case, every time to take the data when they think others will change, so every time when the data are locked, so that other people want to take this

First look at some data, mentioned the CAS operation is a problem, that is, before CAs A into B and back to A,cas or can set a successful, began very puzzling, how possible, a changed back to a should be able to CAS success ah, why not succeed? So

Http://www.ibm.com/developerworks/cn/java/j-jtp11234/ Fifteen years ago, a multi-processor system was a highly dedicated system that costs hundreds of thousands of dollars (most with two to four processors ). At present, the multi-processor system

Java Day one article June 21 First introduce some optimistic lock and pessimistic lock:Pessimistic lock: Always assume the worst case, every time to take the data when they think others will change, so every time when the data are locked, so that

Recently in the study of the JVM, found that with the virtual machine at the bottom of the understanding of Java multithreading also has a new understanding of the original a small synchronized keyword in the Shia. decided to put their own Java

Https://www.cnblogs.com/qjjazry/p/6581568.html2600433554963791First introduce some optimistic lock and pessimistic lock:Pessimistic lock: Always assume the worst case, every time to take the data when they think others will change, so every time

First introduce some optimistic lock and pessimistic lock:Pessimistic lock: Always assume the worst case, every time to take the data when they think others will change, so every time when the data are locked, so that other people want to take this

Learn a little bit of programming every day PDF ebook, video tutorial free download:Http://www.shitanlife.com/code1. How to useSynchronized is the most common way in Java to ensure thread safety, and synchronized has three main functions:

Recently, I spent a lot of time to better understand the new memory table technology in Hekaton--sql Sever 2014. I read a lot of articles and learned about Haktaon's various internal data storage structures (mostly hash indexes and bw-tree). I also

1. Atomic operation:CAS--compareandswap (), which refers to multiple threads entering a critical region, allows multiple threads to compete freely on a critical area, and finally ensures that one thread wins, and other threads that are not competing

Http://www.cnblogs.com/549294286/p/3766717.htmlExclusive lock: Is a pessimistic lock, synchronized is an exclusive lock that causes all other threads that need to be locked to hang, waiting for the thread that holds the lock to release the

Talking about high concurrency (11) Implementation of several spin locks (v) The java.util.concurrent.atomic.AtomicStampedReference atom variable is used to point to the end of the work queue, why use the atomicstampedreference atom variable

Optimistic lock and pessimistic lock in Java;1. Java is a typical synchronized is a pessimistic lock, that is, exclusive lock, but JDK1.6 after the synchronized has done a lot of optimization, can not be said to be completely pessimistic lock;2.

Reprinted from: http://www.blogjava.net/xylz/archive/2010/07/04/325206.html Before JDK 5, the Java language relied on the synchronized keyword to ensure synchronization, which would lead to a lock (the lock will be discussed later ). The lock

In the previous two blogs (the implementation of thread-safe unlocked ringbuffer, a non-lock queue implementation of a read thread for multiple write threads), it was written that in the case of only one read thread, one write thread, and only one

Java Virtual machines-thread safety and lock optimization thread safetyThread Safety: When multithreading accesses an object, the object is thread-safe if it is not necessary to consider the scheduling and alternation of these threads in the

One, the heavy lock In the last article, we introduced the usage of synchronized and the principle of its realization. Now we should know that synchronized is implemented through one of the object's internal call monitor locks. But the nature of