Programmer Think

In the past, I used to use timerfd when writing programs and timers, but would it be defective? If you need to create a lot of timers, you will create a lot of descriptors, and if you create a lot of timers, it will undoubtedly cause a lot of switching between user state and kernel state. Can you implement a set of timers in user state? This ca ...

1, Overall concept combing In this article, the code example of python fireworks effect is compiled for you. Friends who are interested in this can learn and refer to it. Friends who knock code every day, have you ever thought that code can also become very cool and romantic? Today, I'll teach you to simulate the blooming firework ...

1. Multithreading 1.1 program, process, thread Program: a set of commands. In order to complete the specified functions, the program is a static concept and is generally stored in the hard disk Process: a running program is a dynamic concept and needs to be saved in memory. The operating system will allocate the corresponding PID. When we cl ...

Java foundation and Java process control User interaction Scanner Basic syntax: Scanner s = new Scanner(System.in) Get the input string through the next() and nextLine() methods of the Scanner class. Before reading, we generally need to use hasNext() and hasNextLine() to judge whether there is still input data. The Scanner object has two ...

type The object of path represents the path on the file system. Only the syntax appearance of the path is handled: The pathname may represent a path that does not exist, or even a path that is not allowed to exist on the current file system or operating system. Path names have the following syntax: Root name (optional): identifies a file ...

preface Collected several common functions in file upload and utilization. An in-depth understanding of these functions should contribute to the smooth upload and utilization of files. Indexes 1. deldot 2. in_array 3. intval 4. strrchr 5. strtolower 6. strrpos 7. str_ireplace 8. strstr 9. substr 10. trim Common functions 1. deld ...

First, I'll show you the beautiful black frame= Come on, do it! catalogue 1: Components of the game 2: Special section summary (1) Create two 2D arrays: mine array: show array: 2: Game implementation logic 3: Array size creation problem 3: code implementation (1)game.h (2)game.c (3)test.c 4: Test game 1: Components of the ga ...

It realizes a most basic bank management system (based on classes and objects), has no complex functions, and is easy for beginners to operate. After the basic framework is implemented, it can continue to enrich its functions, realize more powerful management functions, or realize graphical interface, input and output stream saving, databas ...

1, Shell Basics Shell:Shell is a program written in C language. It is a bridge for users to use Linux. Shell is both a command language and a programming language. Shell refers to an application that provides an interface through which users can access the services of the operating system kernel. shell script: a script program written for th ...

catalogue 1. Basic concepts 2. Usage scenario 3. Serialization and deserialization API in JDK 3.1 basic principles 3.2 example (1) Class does not implement the Serializable interface, which is an example of serialization (2) Class implements the Serializable interface for serialization and deserialization 4. Role of serialVersionUID 4. ...