How to realize the depth Analysis of libevent Source Code

This article shows you how to achieve libevent source code depth analysis, the content is concise and easy to understand, absolutely can make your eyes bright, through the detailed introduction of this article, I hope you can get something.

1. Preface

Libevent is a lightweight open source high-performance network library with a large number of users, researchers and related articles.

Libevent is written in C language and is almost ubiquitous function pointer. Learning its source code also requires a considerable c language foundation.

Introduction to 2.Libevent

Of course, you have to praise libevent first. There are a few bright spots in libevent:

Event driven (event-driven), high performanc

Lightweight, focused on the web, not as bloated as ACE

The source code is quite concise and easy to read

Cross-platform support for Windows, Linux, BSD and Mac Os

Support a variety of Icano multiplexing technologies, such as epoll, poll, dev/poll, select and kqueue, etc.

Support for events such as Icano, timers and signals

Register event priority

Libevent has been widely used as the underlying network library, such as memcached, Vomit, Nylon, Netchat and so on.

The latest stable version of libevent is 1.4.13; this is also the version referenced by the article.

3. The benefits of learning

Learning libevent helps to improve programming skills. In addition to network programming, there are many useful design skills and basic data structures in libevent code, such as information hiding, function pointers, polymorphic support of c language, linked lists and heaps, etc., all help to improve their programming skills.

Programming not only needs to understand the framework, many details are also the key to the success or failure of the whole system. Only a general understanding of the framework of libevent itself, it may be only a little knowledge, without in-depth code analysis, it is difficult to understand the ingenuity of its design, it is difficult to use for their own.

In fact, libevent itself is a typical Reactor model, and understanding the Reactor pattern is the cornerstone of understanding libevent.

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