Programmer Think

1, Thread theory foundation Advantages of threads One of the reasons to use multithreading: Compared with the process, it is a very frugal way of multitasking. Under the Linux system, to start a new process, it must be allocated an independent address space, and a large number of data tables must be established to maintain its code segments, ...

Catalogue of series articles leetcode: Week 1 leetcode questions: the second week Tip: after writing the article, the directory can be generated automatically. For how to generate it, please refer to the help document on the right preface leetcode questions: the second week Day 1 (breadth first search / depth first search) 1. Im ...

Top level distribution analysis of LAMP architecture in Linux system theory 1, LAMP (Linux Apache MySQL PHP) LAMP It has the advantages of universal, cross platform, high performance and low price LAMP Whether it is performance, quality or price, it is the preferred platform for enterprises to build websites (1) Distribution interpretation ...

1. Background Example: create a window to sell tickets, and the total number of tickets is 100 Use the way to implement the Runnable interface * 1. Problem: in the process of selling tickets, there are duplicate tickets and wrong tickets -- > there are thread safety problems2. Cause of the problem: when a thread is operating the ticket ...

Firewall firewall policy details 1, Firewall firewalld Firewall is Centos7 The default firewall management tool of the system replaces the previous one iptables In the firewall layer, packet filtering also belongs to the network. firewalld and iptables are tools used to manage firewalls (in user mode) to define various rules and functions o ...

Creation and use of Nacos online configuration file (key) offline configuration files can be used for configuration management in the development stage. When the service is online, all local configurations can be added to Nacos configuration management for online configuration management. 1.Nacos client settings 1.1 launch and open the Nacos ...

1, To create an anonymous pipe: #include <unistd.h> int pipe(int pipefd[2]); Function: create an anonymous pipeline for inter process communication; Parameter: int pipefd[2] this array is an outgoing parameter; pipefd[0] corresponds to the reading end of the pipeline; pipefd[1] corresponds to the write end of the pipeline; Return va ...

1, Preface The parking lot management system written by sqlite3 Its main functions are 1. Check the garage vacancy 2 Car owners choose parking spaces 3. System billing 4 View parking records of specified vehicles 5. Check the parking records of all vehicles 6 sign out 2, Explain time_t() function (because it is used) Let's explai ...

The test environment built this time: PHP (5.5-7.0) + Apache (> 2.0) + MySQL 5 7 (Architecture) → Windows/Linux The first step is to install the basic software through yum Installation method: directly use after decompression; rpm file installation; yum online installation; There is no need to configure the yum source here, becaus ...

First at ~ / go / SRC / GitHub Compile order and peer under COM / hyperledger / fabric Compile Orderer $ cd $GOPATH/src/github.com/hyperledger/fabric/ $ make orderer After the command is executed, the terminal output is as follows: Compile peer $ make peer After the command is executed, the terminal output is as follows: Compile ...