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  Hello, Kernel!

When we learn module programming, the first small program must be hello, kernel!. For a novice, how do we avoid some mistakes and how to fix the bugs we have when writing the first module program? Is there any example we can refer to? Here is one example. 1. Write the hello.c 01 #include <linux/init.h> 02 #include <linux/module.h> 03 #include <linux/kernel.h> 04 //Compulsory 05 //Module lincese declaration 06 MODULE_LICENSE("GPL"); ...

   module,kernel,Linux     2013-05-03 03:33:52

  The First Bite on etcd Code

Etcd, one of the crucial components of Kubernetes. If APIServer is the heart, then etcd is the blood vessel that sends the end state of Kubernetes resources to various “organs”, providing high-speed, stable storage, and supporting APIServer’s high load performance. What if the etcd is not working properly? Just the condition as someone has a vascular disease. The deeper you know about them, the better diagnose you can make when issues occur. from unspl...

   SOURCE CODE,ETCD     2022-02-12 01:03:14

  Spring – Web sockets in Java Development

Experts of java development team are sharing this article with entire java development community. The purpose behind intending this post is to explain spring – Web sockets as a concept to rest of the world. Technology: Web socket is the one of the protocol supported by web-browsers and web-servers. It provides the two-way communication between client and server. It is used in any Java application for providing the two way communication between client and server. It opens a connection betw...

   JAVA DEVELOPMENT,SPRING,JAVA TECHNOLOGY     2016-09-13 03:56:54

  What is pjax and why we should use it?

What is pjax? Now many websites such as Facebook, Twitter support one browsing style which is when you click one link on their sites, the page will not be redirected, instead only the page contents are updated and URL on address bar is changed. This kind of user experience is much better compared to load the whole page with a blink. There is one important component in the above browsing experience, these websites' AJAX refresh support browser history, when refreshing the page, the address on the...

   pjax,AJAX,history     2013-04-23 12:22:37

  2D Indoor CQB Robot Simulation

Program Design Purpose: The integration of robots in Close Quarters Battle (CQB) represents a significant advancement in modern military and law enforcement tactics. These robots, designed to navigate tight spaces, gather real-time intelligence, and engage threats, are invaluable assets in high-stakes scenarios. Our goal is to develop a 2D tactical board simulation system, similar to a computer game, that can load building floor blueprints, display CQB squad (robot) positions, enemy locations, ...

       2024-08-11 08:40:31

  SIEM Big Data Visualization [02]: National Cyber Threats Dashboard

Dashboard for Summarizing SG National Cyber Threats in Critical Infrastructure Program Design Purpose: The purpose of this program is to develop a comprehensive Angular web dashboard plugin for a Security Information and Event Management (SIEM) system, focusing on the effective monitoring, categorization, summarization, and visualization of cyber threat events targeting Singapore's critical infrastructure. This dashboard will provide researchers and security managers with a clear, concise view ...

       2024-10-19 09:56:45

  Go是一门面向对象的编程语言吗

Golang已经开源了13年，在最近的TIOBE编程语言排名中，于2023年3月再次进入前十名，并比2022年底的排名上升了两个位置。 Go在2022年底提高了2个排名 许多第一次接触Go的开发者来自面向对象的编程语言，比如Java、Ruby等，他们在学习Go后第一个问题通常是：Go是一种面向对象的语言吗？在本文中，我们将探讨这个问题。 追溯 在广为人知的Go编程语言“圣经”《The Go Programming ...

   OOP,CHINESE,GOLANG,GO     2023-05-02 23:41:38

  How to check when an API is introduced in GoLang

Normally people would not pay much attention to which GoLang version is being used as lots of functions are backward compatible. However there are cases where GoLang version does matter as some functions may not be supported by old version of GoLang. For example, strings.Builder is introduced in Go 1.10, but below code would fail to be compiled on Go 1.10. package main import ( "fmt" "strings" ) func main() { var b strings.Builder b.WriteString("polarisxu") fmt.Println(b.Cap()) } The ...

   GOLANG,API VERSION,GO TOOL     2021-02-07 00:43:24

  Why (offset, limit) is slow in database select?

Starting from a problem Five years ago when I was working at Tencent, I found that MySQL request speed was very slow in the pagination scenario. With only 100,000 data, a select query on a single machine took about 2-3 seconds. I asked my mentor why, and he asked in return, "In an indexing scenario, what is the time complexity to get the nth largest number in MySQL?" The pursuit of the answer Confirming the scenario Assuming there is an index on the "status" column, a query like "select * from t...

   SLOW,LIMIT,OFFSET,MYSQL     2023-03-12 05:21:02

  Why Math.min() > Math.max() is true in JavaScript

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   JAVASCRIPT,MATH.MIN(),MATH.MAX(),COMPARISON     2022-05-02 05:27:07

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