1. Volatile concept The volatile keyword is a lightweight synchronization mechanism in the Java language. It can guarantee the visibility and ordering of shared variables, but it cannot guarantee atomicity. 2. The role of volatile 1. Visibility In Java, each thread has its own working memory (cache) that stores copies of the variables it uses. […]
Tag: volatile
Master the volatile keyword in Java
Caching What is cache Cache (Cache) is a temporary storage device used to store computer data. It is used to speed up data access and reduce frequent access to main memory (RAM) or disk. Cache improves system performance by storing the most frequently used data closer to the CPU, providing faster data retrieval. Purpose of […]
How to stop a thread correctly? Why is the stopping method for volatile flag bits wrong?
Java all-round learning + interview guide: https://javaxiaobear.cn Today we mainly learn how to stop a thread correctly? And why is the stopping method of marking bits with volatile wrong? First, let’s review how to start a thread. To start a thread, you need to call the start() method of the Thread class and define the […]
[C Language | Keywords] Detailed explanation of 32 keywords in C language (2) – modified type part (auto, signed, unsigned, static, extern, const, register, volatile)
Blog homepage:https://blog.csdn.net/wkd_007 Blog content:Embedded development, Linux, C language, C++, data structure, audio and video Content of this article:Introducing the 32 keywords of the standard C language Golden sayings to share:You must try it if you have the chance. In fact, the cost of trial and error is not high, but the cost of missing out […]
Thread visibility (keyword volatile)
Table of Contents Let me demonstrate this invisibility below: So how to solve this invisibility? Thread visibility means that when multiple threads access shared variables at the same time, modifications to variables by one thread can be immediately seen by other threads. Failure to properly handle thread visibility can lead to data inconsistencies or unexpected […]
Concurrency keywords in concurrent programming–volatile
Table of Contents Introduction to volatile volatile implementation principle volatile happens-before relationship volatile memory semantics volatile memory semantics implementation The difference and connection between synchronized and volatile Example volatile introduction We learned before that synchronized is blocking synchronization, which will be upgraded to a heavyweight lock when thread competition is fierce. Volatile is one of […]
Java keywords: Implementation principles of volatile ordering and visibility
JMM memory model and Volatile
What is JMM **A set of specifications for concurrent programming operations** defined by Java, in addition to abstracting the **relationship between main memory and threads**, also stipulates **Conversion process from Java code to Cpu instructions** regulations. These regulations are formulated to **simplify programmers’ development in a concurrent environment**, because the CPU multi-level cache model and […]
The role of volatile/register/const/static/extern/auto keywords in C language
Table of Contents 1. volatile 2. Detailed explanation of register 3. Detailed explanation of const 4. Detailed explanation of static 5. Detailed explanation of extern grammar effect 6. Detailed explanation of auto Suddenly I want to summarize the functions of these keywords. Using them flexibly will improve the reliability and speed of the program. 一、volatile […]
A detailed introduction to the volatile keyword
1. Error Case The volatile keyword is introduced through a case, such as the following code example: If the volatile keyword is not added at this time, there will be problems with the communication between the two threads. public class ThreadsShare { private static boolean runFlag = false; // no volatile is added here public […]