Semaphores–System V semaphores and Posix semaphores

What is a semaphore A semaphore is a counter used to control access to resources shared by multiple processes/threads. Often used together with locks. When a process/thread is accessing a resource, the semaphore can prevent another process/thread from disturbing it. Producer and consumer models are typical uses of semaphores. Why are there two sets of […]

Synchronization Quest: Understanding the differences and applications of System V and POSIX semaphores

Directory title 1. Introduction 1.1 Overview of the importance of semaphores 1.2 Purpose of this article: Compare System V and POSIX semaphores 2. Basics of Semaphores 2.1 Definition and Function of Semaphores 2.2 The role of semaphores in process synchronization (Role in Process Synchronization) Synchronization and Mutual Exclusion The similarity between the psychology of semaphores […]

Trajectory planning simulation of articulated six-axis manipulator based on MATLAB

Trajectory planning in Cartesian space is divided into linear trajectory planning and arc trajectory planning. This article is a matlab simulation analysis of arc interpolation method in Cartesian space. Table of Contents 1 Experimental purpose 2 Experimental content 2.1 Standard D-H parameter method 2.2 Matlab functions used in experiments 3 all codes 4 Simulation results […]

Install redis-cluster three hosts and six instances

1. Prepare the environment: three clean virtual machines and turn off the firewall and selinux 192.168.46.129 redis-1 7001 7002 192.168.46.132 redis-2 7003 7004 192.168.46.135 redis-3 7005 7006 2. Install redis Use the script installation given above or other installation methods. Please change the script installation to the available yum source. 3. Configure different nodes and […]

Six Design Principles: Building Elegant, Maintainable, and Scalable Software

Six design principles: Build elegant, maintainable and scalable software Single Responsibility Principle Open-Closed Principle Liskov Substitution Principle Dependency Inversion Principle Interface Segregation Principle Composite Reuse Principle Design principles are basic guidelines used in software engineering to guide and evaluate design decisions. Following these principles helps create software systems that are highly cohesive, low coupling, and […]

How to prevent others from taking screenshots of your screen using Python? Here are six ways!

In this article, we will discuss six ways to prevent screenshots using Python. These methods can help protect your application from attacks such as screenshots, screen recordings, or screen recordings. These methods are not only used to protect your personal information and privacy, but they can also be used to protect valuable business information from […]

ApiSix plug-in Basic-Auth adds a backup password field to achieve smooth password switching

ApiSix plug-in Basic-Auth adds a backup password field to achieve smooth password switching Introduction Technology stack introduction ApacheAPISIX Consumer Consumer Plugin Basic-Auth cause measure Modify the source code basic-auth.lua Modify consumer configuration test other instructions Introduction This article introduces how to add the backup password field backuo_password to the plug-in Basic-Auth in ApiSix to achieve […]