Programmer Think

12. Fork/Join branch merge framework 1. Introduction Fork/Join can split a large task into multiple subtasks for parallel processing, and finally merge the subtask results into the final calculation results for output. The Fork/Join framework does two things Fork: Split a complex task and make it small Join: Merge the split task calculation ...

16 fearless concurrent Safe and efficient handling of concurrent programming is another major goal of Rust Memory security and efficient programming have always been the goal of many languages. Rust uses ownership and type system to balance this In this chapter, we will understand 1. How to create threads to run multi terminal code at the s ...

Multithreading knowledge is a must in Java interview. This article introduces thread pool in detail. In the actual development process, many IT practitioners have a low utilization rate. They just understand a theoretical knowledge and recite various eight part essays, but they don't deeply understand them in their mind, resulting in forgetting ...

Four principles of thread synchronizationMinimum sharing of objects, reducing the need for synchronizationUse advanced concurrency components, such as TaskQueue, producer consumer queue, CountDownLatch, etcWhen you have to use the underlying synchronization primitive, only use non recursive mutexes and conditional variables. Use read-write lock ...

Start with SimpleDateFormat Let's first look at an example. When 20 threads are created, one thing is done in the thread, that is, the conversion time public class ThreadLoaclExample { //Non thread safe private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); public static Date parse(String strDat ...

introduction The previous article mentioned that the "multi-threaded version of if" can be used to understand the Guarded Suspension mode, which is different from the if in a single thread. This "multi-threaded version of if" needs to wait and is very persistent. You must wait until the condition is true. But obviously, ...

What is a fence In Java, the fence CyclicBarrier is a synchronization mechanism. The fence enables a group of threads to be blocked when they reach a synchronization point. Until the last thread in the group reaches the synchronization point, all blocked threads will be awakened and continue to execute, that is, the purpose is to continue to e ...

preface In the last article, we used wait & notify Implement blocking queue Implemented a blocking queue. Today, let's see how to use the Condition object of ReentrantLock to implement the blocking queue practice public static void main(String[] args) { ConditionQueue conditionQueue = new ConditionQueue(5); for (int i ...

introduction In fact, when we explained the principle of synchronized keyword in Java Concurrent Programming in our last article, we talked about the concept of CAS many times, so what is it? In fact, in order to solve the thread safety problems caused by multi-threaded parallel execution, we often use the locking mechanism to change multi-thr ...

Catalogue of series articles 1: Computer model & detailed explanation of volatile keyword 2: Lock system in java 3: synchronized keyword explanation 5: Atomic atomic class and Unsafe magic class 6: ABA problems and solutions under CAS 1, CAS problem introduction In the concurrency problem, the first thought is undoubtedly ...