pid fork

Turn from: http://blog.csdn.net/analogous_love/article/details/52806722 First, the introduction of the daemon program is always running the service-side program, also known as the daemon process.This paper introduces the steps of writing daemon

By default, Nginx is a multi-process run mode. Nginx and memcached are not the same, is a multi-process mode. Maximum benefits of using multi-process mode: 1. Resource independence for each process 2. No need to add a variety of cumbersome

When using Epoll, if you call fork to create a child process after calling Epoll_create, the parent-child process has a copy of its own Epoll instance, but in the kernel, they refer to the same instance. When a child process adds, modifies, and

Orphan process and daemon processThrough the previous study we learned how to create a process through the fork () function and the vfork () function. Now let's go into two special processes: The orphan process and the daemon.I. The orphan process1.

22.2 Parent-Child Process action fileFile operations are made up of two modes:IO System invoke Operation fileStandard C IO Operation fileLook at the code:1#include 2#include string.h>3#include 4#include 5#include 6 7 intG_val = -;//global variables,

Talk C together (79th back: C language instance-parent process and child process) Hello, everyone. In the previous session, we talked about the process creation example. The example here is:Parent process and child process. When you leave the rest

I. Port 1. 0-1023: Reserved port, used by Super Users 2. 1024-49151: The registered port number 3. 49152-65535: freely available port or dynamic port Ii. Socket Type 1. SOCK_STREAM (byte stream socket): connection-oriented, reliable full-duplex byte

1. on the linux platform, each thread can have dedicated data: # Include # Include Struct mydata { Int x; Char c [4]; }; Pthread_t pthreada, pthreadb; Pthread_key_t datakey; // each process is created once. Different threads and keys with

When a thread calls a function fork, the entire process address space is copied to the child process, Copy-on-write is mentioned in section 8.3. A child process is a process that is completely different from the parent process, but if neither the

 With the development and popularization of network, mail server is becoming an indispensable part of people's daily life. Today, many enterprises use Lotus Note, Exchange as a mail server inside the company. This paper mainly introduces a kind of

In Art, DexClassLoader converts dex to the oat file format. dexclassloaderoat After reading the source code DexClassLoader, the native function openDexFileNative in the DexFile class will be called. Next let's take a look at what the

Want to write something about multi-process and multithreading, I really love them. But often want to write something about them, but always perfection psychological trouble, always can't move hand.Today finally made a decision to write something,

The installation directory of nginx is/usr/local/nginx. The virtual machine configuration file is/usr/local/nginx/conf/vhosts. conf. Currently, php fast-cgi supports The following operations are completed under su: ==================================

  C programming practices in Linux (III) -Process Control and Process Communication Programming   1. Linux Process A Linux Process contains three parts of data in the memory: code segment, stack segment, and data segment. The code segment stores the

By LiAnLab.org/song BaohuaThe Android architecture-software self-healing capability-has come to an end. Next we will discuss Android performance considerations in Series 2. The Android system components are complex and have a root node. If you do

PHP implements parallel multi-process operations (daemon can be used ). As follows: Copy the code as follows: ** entry function * saves this file as ProcessOpera. php * and runs usrlocalphpbinphpProcessOpera. phpnbsp in terminal. * view the process

Few people may realize that after a process calls exit, the process does not disappear immediately, but leaves a data structure called Zombie. Among the five Linux processes, the zombie process is a very special one. it has abandoned almost all the

This article mainly introduces how to use multi-process programming functions in PHP using examples, including processing zombie processes! You can refer to a set of process control functions in PHP (enable-pcntl and posix extensions are required

Linux System Programming (2nd edition)Jump to: Navigation, search Directory 1 Getting Started and basic concepts 2 file I/O 3 buffered I/O 4 Advanced file I/O 5 Process Management 6 Advanced

If the child process ends before the parent process, the parent process calls the wait () function and does not call the wait () function to produce two different results: -- if the parent process does not call wait () and waitpid () function, the