Programmer Think

1. Experimental purpose By debugging a problematic program, proficient in using vi, mastering gcc compilation commands and gdb debugging commands Through the tracking and debugging of problematic programs, the ability to find and solve problems is further improved 2. Experimental contents (1) Using the vi editor, enter the following code int ...

catalogue origin Driver code parsing driver loading dtsi file content parsing Four important analytical functions ​​​​​​​ origin Linus Torvalds declared "this whole ARM thing is a f*cking pain in the ass" in the ARM Linux mailing list on March 17, 2011, which triggered an earthquake in the ARM Linux community, and then the AR ...

File and Directory Rights Management Levels and permissions introduction Level of files and directories User Owner (u)Group Owner (g)Other (o) Permissions for files and directories Read (r)Write (w)Execution (x) When creating a file or directory, permissions are based on two factors: Basic privileges umask The basic permissions a ...

Atomicity of operation Ten threads perform + + on the count variable at the same time, and each thread performs + + 100000 times. The ideal result is 1 million, but the final result is less than 1 million. #include <stdio.h> #include <unistd.h> #include <pthread.h> #define THREAD_COUNT 10 void *func(void *arg) { vol ...

preface Record RocketMQ Quickly build RocketMQ cluster Machine environment Prepare three machines, root password root; IP address: 192.168.232.128 worker1 192.168.232.129 worker2 192.168.232.130 worker3 Create user useradd oper passwd oper (Password entry 123 qweasd) system configuration Switch the oper user and generate a key ...

The previous two articles learned the theoretical basis related to process, and this paper began to learn process programming. Introduction to Linux Programming (13) - process (I) Introduction to Linux Programming (14) - process (II) Create process System function fork() Linux provides a system call fork() to create a new process. Its func ...

SLUB allocator 4 for Linux memory management [slub page size calculation method] Today, I tracked the calculation methods of object and page order in SLUB in detail and sorted them out to avoid forgetting later, mainly including: The calculation method of page order is to apply for kmem_ How many pages should each slab apply for when caching? ...

brief introduction Mplayer is an open source multimedia player that can run in mainstream operating systems, such as LInux, Unix like, Windows, Mac OS. Mplayer is built on the command line interface. For the use of the command line, refer to: https://www.cnblogs.com/huangpeng1990/p/4364373.html Here are some common command lines based on m ...

Ansible common modules At the end of 2015, there were more than 270 modules, reaching 540 in 2016, 1378 modules on January 12, 2018, 1852 modules on July 15, 2018, 2080 modules on May 25, 2019 (ansible 2.7.10), and 3387 modules on March 2, 2020 Although there are many modules, the most commonly used modules are only 2 or 30, and only 10 modul ...

1, Blocking and non blocking IO Blocking and non blocking IO are two common device access modes in Linux driver development. Blocking and non blocking must be considered when writing drivers. In this chapter, we will learn about blocking and non blocking IO, how to deal with blocking and non blocking in the driver, and how to use wait que ...