Programming VIP

Thread usage problems Frequent creation and destruction of threadsToo many threads will cause the overhead of CPU resources.Context switching (consuming CPU resources). Thread reuse Connection pool, object pool, memory pool, thread pool. The core of pooling Technology: reuse Thread pool Create a series of threads in advance and save t ...

preface Tip: when you read this article, you must have a strong desire to learn about multithreading. Then this article will describe in detail the simple use and in-depth understanding of Synchronized keywords, deadlocks, simple use in thread communication, waiting notification mechanism, thread lounge, producer and consumer operation v ...

What is a thread A process does only one thing at a time. With multiple control threads, the process can be designed to do more than one thing at the same time, and each thread handles independent tasks. Process is an instance of program execution and the basic unit for allocating system resources. In the system of thread oriented design, ...

Catalogue of Series Articles Part I Basic Knowledge Chapter II Thread Security The core of thread security is the management of state access operations, especially access to shared and variable states Object state: Informally, data stored in a state variable (instance or static domain), while the state of an object may include domains ...

I What is a thread pool? Thread pool: create several executable threads and put them into a pool (container). When a task needs to be processed, it will be submitted to the task queue in the thread pool. After processing, the thread will not be destroyed, but still wait for the next task in the thread pool. II Why use thread pools? Becau ...

catalogue 1, Semaphore 1. Concept and understanding of semaphore 2. Code example 2, Conditional variable 1. Concept and understanding of conditional variables 2. Correlation function 3. Code example 3, Events 1. Concept and understanding of events 2. Event correlation function 3. Code example 4, Example code demonstration 1. Code e ...

Several default ways of creating thread pools are provided in Java 8 Advantages of thread pool: less resource waste and improved thread reuse Create the top-level class executors. For thread pool class First, open the class and view the methods implemented by the class To sum up, several implementations are: //Single pass pool ...

catalogue JAVA Memory Model (JMM) To gain insight into volatile variables, you must first understand the Java memory model. Therefore, before introducing volatile variables, let's briefly understand the Java memory model. Here, we compare the memory model of physical machine (shared memory multi-core system) with JMM, because there is ...

Condition variables are used to synchronize threads. How to synchronize? Let's look down Conditional variable correlation function #include <pthread.h> int pthread_cond_init(pthread_cond_t* cond, const pthread_condattr_t* condattr); //Initialize condition variable int pthread_cond_destroy(pthread_cond_t* cond); //Destroy condition var ...

Understanding threads A process is divided into multiple independent execution streams, called threads Back to the previous example, a class should not only send and receive homework, but also do blackboard newspapers and clean up. If there is only the monitor, it is not only inefficient but also time-consuming. In order to complete the t ...