Article Introduction：Usage of fork function in Linux In the Linux operating system, the fork() function is a very important system call function, used to create a new process. It is widely used in Unix and Unix-like operating systems. In this article, we will introduce the usage of the fork function in detail and provide some specific code examples. 1. Overview of the fork function The prototype of the fork function is as follows: #include#include

2024-02-23 comment 0  563

Article Introduction：Overview of the role of the fork function in Linux and code examples: In the Linux system, the fork function is a very important system call, and its main function is to create a new process. Function: Create a process: After calling the fork function, the operating system will create a new process, called a child process. The execution code of the child process is exactly the same as the parent process. The child process starts execution from the return point of the fork function. Copy the context of the parent process: The child process will copy many attributes of the parent process, including code segments, data segments, and stacks

2024-02-19 comment 0  1317

Article Introduction：Analysis of the reasons for the failure of the PHPPCNTL extension fork function In PHP, the PCNTL extension provides a series of functions for handling process control, of which the fork function is one of the commonly used functions. Through the fork function, we can create a child process to perform a certain task, which is very useful when writing concurrent handlers. However, when using the PCNTL extended fork function, sometimes you will encounter fork failure. This article will analyze the reasons for this situation and give specific codes.

2024-02-28 comment 0  522

Article Introduction："fork()" in Linux is a system call function used to create a new process. It will create a copy of the current process, called a child process. The child process is almost identical to the parent process, including code, data and open files. File descriptors, etc., whose prototype is "pid_t fork(void);".

2024-01-25 comment 0  1173

Article Introduction：The Fork() function is one of the most commonly used system calls in Linux systems. It is used to create a new process, which is a child process of the calling process. The characteristic of the fork() function is that it is only called once but returns twice, respectively in the parent process and the child process. The return value of the fork() function is different and can be used to distinguish the parent process and the child process. In this article, we will introduce the principles and usage of the fork() function, including the meaning of the return value, the characteristics of the child process, the synchronization and communication of the parent-child process, etc., and give examples of their usage and precautions. 1. Introduction to fork A process includes code, data and resources allocated to the process. The fork() function creates a process that is almost identical to the original process through a system call.

2024-02-10 comment 0  1235

Article Introduction：In this section, we will learn about fork system call in C language. The fork system call is used to create a new process. This newly created process is called a child process. The current process that creates another child process is called the parent process. The child process uses the same program counter, CPU registers, and the same files used by the parent process. The fork() function does not accept any parameters, it returns an integer value. It may return three types of integer values. Negative number: When the creation of the child process fails, a negative number is returned. Zero value: For a newly created child process, zero is returned. Positive number: A positive number is returned to the parent process. Sample code#include<stdio.h>#include<sys/types.h>#i

2023-09-19 comment 0  1500

Article Introduction：Sharing debugging skills for invalid fork function in PHPPCNTL In PHP programming, the PCNTL extension provides some process control functions, such as the fork function, which can be used to create a new process. However, during use, sometimes the fork function fails, causing the child process to fail to be created normally. This article will share some debugging tips to help us solve this problem. First, let's start with a simple example. Let's say we have the following PHP code:

2024-02-28 comment 0  1338

Article Introduction：In Linux, related functions can be achieved by creating a subprocess and executing functions in the subprocess. This is achieved by using the "fork()" and "exec()" series of functions. The specific steps are as follows: 1. Use the "fork()" function to create a child process; 2. In the child process, use the "exec()" series of functions to execute specific functions.

2023-07-05 comment 0  1313

Article Introduction：Analysis of subprocess generated by fork() function in python

2016-10-18 comment 0  1143

Article Introduction：First, create a new m file function Untitled2() in Matlab. Untitled2() is the main function, and then add a sub-function count(i) below the function. The sub-function is called in the main function. The code is as follows: % main function function [sum] =Untitled2()i=10. sum=count(i). end% sub-function function[sum]=count(i)sum=0. fork=1:isum=sum+i. endend then enter [Untitled2()] in the command line window and call the main function. The returned sum value result is 100. Note here that the main function can be called

2024-06-01 comment 0  698

Article Introduction：fork() is a very important system call in Linux and other Unix-like systems. It is used to create a new process. This new process is a copy of the current process, called a child process. The child process will obtain a copy of the parent process's code, data, heap, stack, etc., but the two processes will have different process IDs and some other resources, such as open file descriptors.

2024-03-14 comment 0  1005

Article Introduction：Help matlab how to solve the inverse function of sinc function fork=1:length(y)f=@(x)y(k)*x-sin(x);ezplot(f); % draw a graph and observe that the zero point of the function is at x0(k ) nearby z(k)=fzero(f,x0(k)); % call the fzero function to find the zero point endsxf2012 (contact ta on the site)%% Take y as a data as an example, assuming that the y value is y0, then let %f= @(x)y0-sin(x)/x;%%Use the command: %ezplot(f);%%Draw the graph, observe the function, and find a coordinate x0%% near the zero point. Then, the desired zero point is %z= fzero(f,x0);% call fzero function

2024-01-14 comment 0  823