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Linux source code can go here https://mirrors.edge.kernel.org/pub/linux/kernel/ Download. This article is based on linux-2.6.34. The code of the old version is simpler and easier to understand. Little friends who have learned Linux system programming should know that the entry functions of Linux system calls in the kernel are sys_xxx, ...

Principle and implementation of thread pool 1. What is a thread pool Thread pool is a form of multi-threaded processing. Threads are created in advance and placed in a queue for management. When a task needs to be processed, the task is assigned to a specific thread for execution. Improve performance by reducing thread creation, destruction, ...

1, Why is there dynamic memory allocation 🎗 Before, we opened up space like this: int i = 20; // Open up 4 bytes in stack space char arr[10] = { 0 }; // Open up 10 bytes of continuous space in the stack space characteristic one ️⃣ The size of the open space is fixed two ️⃣ When an array is declared, it must contain a constant ...

1, Arithmetic operator There are five arithmetic operators: + - * /%. Because the operator has two operands. Also known as binocular operator For the / operator, both operands are integers and perform integer division. Performs floating-point division when at least one operand is floating-point #include <stdio.h> int main() { int ...

catalogue 1. Character pointer  2. Pointer array 3. Array pointer 4. Array parameters and pointer parameters 5. Function pointer 6. Function pointer array 7. Pointer to function pointer array 8. Callback function When we first learned the C language, we had a preliminary contact with the existence of pointer and had a general ...

function Introduction of problems Sometimes, we often need to input an array in another program. For example: int a[10]; for(i = 0;i < 10;i++) { scanf("%d",&a[i]); } int b[5]; for(i = 0;i < 5;i++) { scanf("%d",&b[i]); } ... Functions: reuse code blocks. function What is a function? Function function A funct ...

This is bilibili - [End] 2020 Nanjing University "operating system: design and implementation" (Jiang Yanyan) Course notes for Summary of this lecture: What is concurrency, why concurrency is needed, and a new understanding of concurrent programming Abandon the atomicity, sequence and visibility of the program Concurrency an ...

Platform: Code Composer Studio 10.3.1 MSP430F5529 LaunchPad™ Development Kit (MSP‑EXP430F5529LP) Hard knowledge 1, MSP430 MCU port overview General I/O port is the most important and commonly used peripheral module of MSP430 single chip microcomputer. The general I/O port can not only be directly used for input / output, but also prov ...

The whole member management system is designed as data addition module, data modification module, data deletion module, data search module by name or category, data browsing module, data emptying module and data storage module. contact.h // Header file #include <stdio.h> #include <stdlib.h> #include <string.h> #include & ...

catalogue 1, Document classification Program file data file II. Documents file name field name pointer Opening and closing of files Sequential reading and writing of files Random reading and writing of files Text and binary files End judgment of documents file buffer case Program filedata file 1, Document classification ...