cas operation

The Java code is compiled into Java bytecode, bytecode is loaded into the JVM by the ClassLoader, and the JVM performs bytecode conversions to the assembly instructions on the CPU. The concurrency mechanism in Java relies on the implementation of

There are several options for applying HashMap in a Java multithreaded environment: using thread-safe java.util.Hashtable as an alternative Use the Java.util.Collections.synchronizedMap method to wrap an existing HashMap object as thread-safe. Using

"Die knock Java Concurrency"-----Deeply analyze the realization principle of synchronized I remember just beginning to learn Java, one encounter multithreading situation is synchronized, relative to us at that time synchronized is so magical and

Directory 1. Preface 2. Lock-free queue based on bidirectional linked list 2.1 Queue Method 2.2 Team-out method 3. Performance Testing 4. Summary 1. Preface If you've read this blog I wrote a few days ago to

First, the weight of class lockIn Java, synchronized is implemented through a monitor lock inside the object. But the nature of the monitor lock is implemented by the mutex lock which relies on the underlying operating system. and the operating

I have recently read some experiences in parallel programming books, and I have simply recorded several concepts that must be learned by multithreading and parallel programming, so that I can further understand them. . NET Framework4 provides a new

Reclaim Hazard Pointer and hazardpointer in parallel programming In the previous article, the RCU technology is used to implement Lock-free read/write threads. In languages without GC mechanisms, to implement the Lock-free algorithm, you will

A bloodcase caused by a lock-free Message Queue: how to be a real programmer? (3) -- location: q3.h and RingBuffer, q3.hringbufferDirectory A bloodcase caused by a lock-free Message Queue: how to be a real programmer? (1) -- location: Cause A

First, Directory1. Initiation Knowledge Preheating: CAs principle +JVM object Head memory storage structure2.JVM Lock Optimization: Lock coarsening, lock elimination, biased lock, lightweight lock, spin lock.3. Summary: Biased lock, lightweight lock,

This article is based on JDK 1.8. Use of CountdownlatchThe previous article described volatile and the use of volatile to achieve spin locks, such as the tool class under the Java.util.concurrent.atomic package. However, volatile usage

Java Object Header and monitorJava object headers are the basis for implementing synchronized lock objects, and the lock objects used by synchronized are stored in the Java object header.The object header contains two parts: Mark Word and Class

In the previous article, parallel programming in. NET-1. Basic knowledge, which is the basic knowledge needed in. NET for multicore or parallel programming, analyzes the implementation of the lock-free stack in a relatively simple and commonly used

How to implement shared data access without locking mechanisms. (Do not use locks, do not use sychronized blocks or methods, and do not work directly with the thread security provided by the JDKData structure, you need to implement a class to ensure

In the study of the AQS framework, it will be found that many places in this class use CAS operations, in the concurrent implementation of CAS operations must be atomic, but also the hardware level of atomicity, Java is isolated on the hardware,

Reprint please indicate the source: Http://blog.csdn.net/luonanqin A recent study of concurrent packages in JDK has been divided into three parts, thread management, lock operations, and atomic operations. Thread management is usually used more

This article attempts to understand our common sync (synchronized) and lock (lock) mechanisms from another level. If the reader wants to know more about concurrency, recommend a book "Java Concurrent Programming Combat", a very classic book, the

I remember just beginning to learn Java, one encounter multithreading situation is synchronized, relative to us at that time synchronized is so magical and powerful, at that time we give it a name "sync", Also become our solution to multithreading

Spin lock Applicable scenario: Applicable to multiple CPU prerequisites:A. The operation to suspend the first withdrawal and recovery thread needs to be carried out in the kernel state, which can bring great pressure to system B. The lock state is

Looked at the online about the chain list of non-lock operation, writing is not clear, so that their own part of the main use of concurrent and the contract of the CAS operation.1. End of List insertionThe node to be inserted is: curTail Node:

In the previous article, parallel programming in. NET-1. Basic knowledge, which is the basic knowledge needed in. NET for multicore or parallel programming, analyzes the implementation of the lock-free stack in a relatively simple and commonly used