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Relationship between program and process program ● executable codes and data stored in hard disk, optical disk and other media ● statically saved code in the file process ● program code running in CPU and memory ● dynamically executed code ● parent and child processes: each program can create one or more processes View proces ...

Original author: Hollis Character stream, byte stream Bytes and characters Bit is the smallest binary unit and is the operating part of the computer. Value 0 or 1 Byte (byte) is the smallest unit of computer operation data, which is composed of 8 bit s. The value (- 128-127) Char (character) is the smallest readable and writable unit of th ...

I recommend a free open course for the zero acoustics academy. I think the teacher has done a good job. Share it with you: Linux, Nginx, ZeroMQ, MySQL, Redis, fastdfs, MongoDB, ZK, streaming media, CDN, P2P, K8S, Docker, TCP/IP, protocol, DPDK and other technical content, learn now 2 IM Logon Server and Message Server Design 1. Communication ...

thread 1. Linux thread concept A thread is a subtask that runs independently in a process. It can be understood as a "lightweight process". There can be multiple threads in a process, and these threads use the same PCB. 1. An execution route in a program is called a thread. A more accurate definition is that a thread is "a se ...

I BIND domain name service foundation In daily life, people are used to using domain names to access servers, but machines only recognize IP addresses. There is a many-to-one relationship between domain names and IP addresses. An IP address does not necessarily correspond to only one domain name, and a complete domain name can only corres ...

1, ELK introduction 1. What is ELK? "ELK" is an acronym for three open source projects: Elasticsearch, Logstash and Kibana. Elasticsearch is a search and analysis engineLogstash is a server-side data processing pipeline, which can collect data from multiple sources at the same time, convert data, and then send data to "reposit ...

preface Students who have read UNIX network programming know that this book introduces all aspects of sockets in detail, and gives each structure Implementation code file of system API. However, with the continuous development of technology, the kernel of the operating system is constantly updated. The book describes the relevant address struc ...

1, Overview of relational database and non relational database 1. Relational database Relational database is a structured database, which is created on the basis of relational model (two-dimensional table model) and is generally record oriented. SQL statement (standard data query language) is a language based on relational database, whic ...

1, Basic command 1.1. Startup and login Boot will start many programs. They are called "service s" in Windows and "daemon s" in Linux. After successful startup, the text login interface will be displayed, which will not be displayed when entering the password. Generally speaking, there are three ways for users to log i ...

LCD driver under Linux In linux driver development, it is essential to use lcd for human-computer interaction. Therefore, how can we initialize lcd in the kernel? 1. LCD screen IO configuration Open dts device tree file, create lcd child nodes in iomuxc pinctrl_lcdif_dat: lcdifdatgrp { fsl,pins = < MX6UL_PAD_LCD_DATA00__LCDIF_DATA00 0 ...