add markdown text

Achigudan · Feb 11, 2018 · fb7d620 · fb7d620
1 parent 81a5c8c
commit fb7d620
Show file tree

Hide file tree

Showing 196 changed files with 121 additions and 7 deletions.
diff --git a/.gitignore b/.gitignore
diff --git a/.travis.yml b/.travis.yml
diff --git a/CMakeLists.txt b/CMakeLists.txt
diff --git a/LICENSE b/LICENSE
diff --git a/README.md b/README.md
@@ -1,8 +1,36 @@
-# WebServer
-C++ Web Server
----
-
-[![Build Status](https://travis-ci.org/linyacool/WebServer.svg?branch=master)](https://travis-ci.org/linyacool/WebServer)
-[![license](https://img.shields.io/github/license/mashape/apistatus.svg)](https://opensource.org/licenses/MIT)
-
+# A C++ High Performance Web Server
+
+## Introduction  
+
+* 本项目为C++11编写的Web服务器，解析了get、post请求，可处理静态资源，支持HTTP长连接，并实现了异步日志，记录服务器运行状态。
+
+## Envoirment  
+* OS: Ubuntu 14.04
+* Complier: g++ 4.8
+
+## Build
+
+	./build.sh
+
+## Technical points
+* 使用Epoll边沿触发的IO多路复用技术，非阻塞IO，使用Reactor模型
+* 使用多线程充分利用多核CPU，并使用线程池避免线程频繁创建销毁的开销
+* 使用基于小根堆的定时器关闭超时请求
+* 主线程只负责accept请求，并以Round Robin的方式分发给其它IO线程(兼计算线程)，锁的争用只会出现在主线程和某一特定线程中
+* 使用eventfd实现了线程的异步唤醒
+* 使用双缓冲区技术实现了简单的异步日志系统
+* 为减少内存泄漏的可能，使用智能指针等RAII机制
+* 使用状态机解析了HTTP请求
+
+## Others
+除了项目基本的代码，进服务器进行压测时，对开源测试工具Webbench增加了Keep-Alive选项和测试功能: 改写后的[Webbench](https://github.com/linyacool/WebBench)
+
+
+
+
+---
+
+[![Build Status](https://travis-ci.org/linyacool/WebServer.svg?branch=master)](https://travis-ci.org/linyacool/WebServer)
+[![license](https://img.shields.io/github/license/mashape/apistatus.svg)](https://opensource.org/licenses/MIT)
+
 ---
diff --git a/WebBench/man/man1/webbench.1 b/WebBench/man/man1/webbench.1
diff --git a/WebBench/share/doc/webbench/changelog b/WebBench/share/doc/webbench/changelog
diff --git a/WebBench/share/doc/webbench/copyright b/WebBench/share/doc/webbench/copyright
diff --git a/WebServer/.vscode/settings.json b/WebServer/.vscode/settings.json
diff --git a/WebServer/CMakeLists.txt b/WebServer/CMakeLists.txt
diff --git a/WebServer/Channel.cpp b/WebServer/Channel.cpp
diff --git a/WebServer/Channel.h b/WebServer/Channel.h
diff --git a/WebServer/Epoll.cpp b/WebServer/Epoll.cpp
diff --git a/WebServer/Epoll.h b/WebServer/Epoll.h
diff --git a/WebServer/EventLoop.cpp b/WebServer/EventLoop.cpp
diff --git a/WebServer/EventLoop.h b/WebServer/EventLoop.h
diff --git a/WebServer/EventLoopThread.cpp b/WebServer/EventLoopThread.cpp
diff --git a/WebServer/EventLoopThread.h b/WebServer/EventLoopThread.h
diff --git a/WebServer/EventLoopThreadPool.cpp b/WebServer/EventLoopThreadPool.cpp
diff --git a/WebServer/EventLoopThreadPool.h b/WebServer/EventLoopThreadPool.h
diff --git a/WebServer/HttpData.cpp b/WebServer/HttpData.cpp
diff --git a/WebServer/HttpData.h b/WebServer/HttpData.h
diff --git a/WebServer/Main.cpp b/WebServer/Main.cpp
diff --git a/WebServer/Makefile b/WebServer/Makefile
diff --git a/WebServer/Makefile.bak b/WebServer/Makefile.bak
diff --git a/WebServer/Server.cpp b/WebServer/Server.cpp
diff --git a/WebServer/Server.h b/WebServer/Server.h
diff --git a/WebServer/ThreadPool.cpp b/WebServer/ThreadPool.cpp
diff --git a/WebServer/ThreadPool.h b/WebServer/ThreadPool.h
diff --git a/WebServer/Timer.cpp b/WebServer/Timer.cpp
diff --git a/WebServer/Timer.h b/WebServer/Timer.h
diff --git a/WebServer/Util.cpp b/WebServer/Util.cpp
diff --git a/WebServer/Util.h b/WebServer/Util.h
diff --git a/WebServer/base/AsyncLogging.cpp b/WebServer/base/AsyncLogging.cpp
diff --git a/WebServer/base/AsyncLogging.h b/WebServer/base/AsyncLogging.h
diff --git a/WebServer/base/CMakeLists.txt b/WebServer/base/CMakeLists.txt
diff --git a/WebServer/base/Condition.h b/WebServer/base/Condition.h
diff --git a/WebServer/base/CountDownLatch.cpp b/WebServer/base/CountDownLatch.cpp
diff --git a/WebServer/base/CountDownLatch.h b/WebServer/base/CountDownLatch.h
diff --git a/WebServer/base/CurrentThread.h b/WebServer/base/CurrentThread.h
diff --git a/WebServer/base/FileUtil.cpp b/WebServer/base/FileUtil.cpp
diff --git a/WebServer/base/FileUtil.h b/WebServer/base/FileUtil.h
diff --git a/WebServer/base/LogFile.cpp b/WebServer/base/LogFile.cpp
diff --git a/WebServer/base/LogFile.h b/WebServer/base/LogFile.h
diff --git a/WebServer/base/LogStream.cpp b/WebServer/base/LogStream.cpp
diff --git a/WebServer/base/LogStream.h b/WebServer/base/LogStream.h
diff --git a/WebServer/base/Logging.cpp b/WebServer/base/Logging.cpp
diff --git a/WebServer/base/Logging.h b/WebServer/base/Logging.h
diff --git a/WebServer/base/Log的设计.txt b/WebServer/base/Log的设计.txt
diff --git a/WebServer/base/MutexLock.h b/WebServer/base/MutexLock.h
diff --git a/WebServer/base/Thread.cpp b/WebServer/base/Thread.cpp
diff --git a/WebServer/base/Thread.h b/WebServer/base/Thread.h
diff --git a/WebServer/base/noncopyable.h b/WebServer/base/noncopyable.h
diff --git a/WebServer/base/tests/CMakeLists.txt b/WebServer/base/tests/CMakeLists.txt
diff --git a/WebServer/base/tests/LoggingTest.cpp b/WebServer/base/tests/LoggingTest.cpp
diff --git a/WebServer/config.h b/WebServer/config.h
diff --git a/WebServer/core b/WebServer/core
diff --git a/WebServer/favicon.ico b/WebServer/favicon.ico
diff --git a/WebServer/improvement.txt b/WebServer/improvement.txt
diff --git a/WebServer/index.html b/WebServer/index.html
diff --git a/WebServer/tests/CMakeLists.txt b/WebServer/tests/CMakeLists.txt
diff --git a/WebServer/tests/HTTPClient.cpp b/WebServer/tests/HTTPClient.cpp
diff --git a/WebServer/tests/build/release/CMakeCache.txt b/WebServer/tests/build/release/CMakeCache.txt
diff --git a/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CMakeCCompiler.cmake b/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CMakeCCompiler.cmake
diff --git a/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CMakeCXXCompiler.cmake b/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CMakeCXXCompiler.cmake
diff --git a/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CMakeSystem.cmake b/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CMakeSystem.cmake
diff --git a/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CompilerIdC/CMakeCCompilerId.c b/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CompilerIdC/CMakeCCompilerId.c
diff --git a/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CompilerIdCXX/CMakeCXXCompilerId.cpp b/WebServer/tests/build/release/CMakeFiles/2.8.12.2/CompilerIdCXX/CMakeCXXCompilerId.cpp
diff --git a/WebServer/tests/build/release/CMakeFiles/CMakeError.log b/WebServer/tests/build/release/CMakeFiles/CMakeError.log
diff --git a/WebServer/tests/build/release/CMakeFiles/CMakeOutput.log b/WebServer/tests/build/release/CMakeFiles/CMakeOutput.log
diff --git a/WebServer/tests/build/release/CMakeFiles/cmake.check_cache b/WebServer/tests/build/release/CMakeFiles/cmake.check_cache
diff --git a/datum/WebServer.png b/datum/WebServer.png
diff --git a/datum/WebServerk.png b/datum/WebServerk.png
diff --git a/datum/close.png b/datum/close.png
diff --git a/datum/idle.png b/datum/idle.png
diff --git a/datum/keepalive.png b/datum/keepalive.png
diff --git a/datum/muduo.png b/datum/muduo.png
diff --git a/datum/muduok.png b/datum/muduok.png
diff --git a/old_version/old_version_0.1/.vscode/settings.json b/old_version/old_version_0.1/.vscode/settings.json
diff --git a/old_version/old_version_0.1/Makefile b/old_version/old_version_0.1/Makefile
diff --git a/old_version/old_version_0.1/Makefile1 b/old_version/old_version_0.1/Makefile1
diff --git a/old_version/old_version_0.1/epoll.cpp b/old_version/old_version_0.1/epoll.cpp
diff --git a/old_version/old_version_0.1/epoll.h b/old_version/old_version_0.1/epoll.h
diff --git a/old_version/old_version_0.1/improvement.txt b/old_version/old_version_0.1/improvement.txt
diff --git a/old_version/old_version_0.1/index.html b/old_version/old_version_0.1/index.html
diff --git a/old_version/old_version_0.1/main.cpp b/old_version/old_version_0.1/main.cpp
diff --git a/old_version/old_version_0.1/requestData.cpp b/old_version/old_version_0.1/requestData.cpp
diff --git a/old_version/old_version_0.1/requestData.h b/old_version/old_version_0.1/requestData.h
diff --git a/old_version/old_version_0.1/threadpool.cpp b/old_version/old_version_0.1/threadpool.cpp
diff --git a/old_version/old_version_0.1/threadpool.h b/old_version/old_version_0.1/threadpool.h
diff --git a/old_version/old_version_0.1/util.cpp b/old_version/old_version_0.1/util.cpp
diff --git a/old_version/old_version_0.1/util.h b/old_version/old_version_0.1/util.h
diff --git a/old_version/old_version_0.2/Makefile b/old_version/old_version_0.2/Makefile
diff --git a/old_version/old_version_0.2/Makefile1 b/old_version/old_version_0.2/Makefile1
diff --git a/old_version/old_version_0.2/epoll.cpp b/old_version/old_version_0.2/epoll.cpp
diff --git a/old_version/old_version_0.2/epoll.h b/old_version/old_version_0.2/epoll.h
diff --git a/old_version/old_version_0.2/favicon.ico b/old_version/old_version_0.2/favicon.ico
diff --git a/old_version/old_version_0.2/improvement.txt b/old_version/old_version_0.2/improvement.txt
diff --git a/old_version/old_version_0.2/index.html b/old_version/old_version_0.2/index.html
diff --git a/old_version/old_version_0.2/main.cpp b/old_version/old_version_0.2/main.cpp
diff --git a/old_version/old_version_0.2/requestData.cpp b/old_version/old_version_0.2/requestData.cpp
diff --git a/old_version/old_version_0.2/requestData.h b/old_version/old_version_0.2/requestData.h
diff --git a/old_version/old_version_0.2/threadpool.cpp b/old_version/old_version_0.2/threadpool.cpp
diff --git a/old_version/old_version_0.2/threadpool.h b/old_version/old_version_0.2/threadpool.h
diff --git a/old_version/old_version_0.2/util.cpp b/old_version/old_version_0.2/util.cpp
diff --git a/old_version/old_version_0.2/util.h b/old_version/old_version_0.2/util.h
diff --git a/old_version/old_version_0.3/Makefile b/old_version/old_version_0.3/Makefile
diff --git a/old_version/old_version_0.3/Makefile1 b/old_version/old_version_0.3/Makefile1
diff --git a/old_version/old_version_0.3/config.h b/old_version/old_version_0.3/config.h
diff --git a/old_version/old_version_0.3/epoll.cpp b/old_version/old_version_0.3/epoll.cpp
diff --git a/old_version/old_version_0.3/epoll.h b/old_version/old_version_0.3/epoll.h
diff --git a/old_version/old_version_0.3/favicon.ico b/old_version/old_version_0.3/favicon.ico
diff --git a/old_version/old_version_0.3/improvement.txt b/old_version/old_version_0.3/improvement.txt
diff --git a/old_version/old_version_0.3/index.html b/old_version/old_version_0.3/index.html
diff --git a/old_version/old_version_0.3/main.cpp b/old_version/old_version_0.3/main.cpp
diff --git a/old_version/old_version_0.3/requestData.cpp b/old_version/old_version_0.3/requestData.cpp
diff --git a/old_version/old_version_0.3/requestData.h b/old_version/old_version_0.3/requestData.h
diff --git a/old_version/old_version_0.3/threadpool.cpp b/old_version/old_version_0.3/threadpool.cpp
diff --git a/old_version/old_version_0.3/threadpool.h b/old_version/old_version_0.3/threadpool.h
diff --git a/old_version/old_version_0.3/util.cpp b/old_version/old_version_0.3/util.cpp
diff --git a/old_version/old_version_0.3/util.h b/old_version/old_version_0.3/util.h
diff --git a/old_version/old_version_0.4/Makefile b/old_version/old_version_0.4/Makefile
diff --git a/old_version/old_version_0.4/Makefile1 b/old_version/old_version_0.4/Makefile1
diff --git a/old_version/old_version_0.4/base/mutexLock.hpp b/old_version/old_version_0.4/base/mutexLock.hpp
diff --git a/old_version/old_version_0.4/base/nocopyable.hpp b/old_version/old_version_0.4/base/nocopyable.hpp
diff --git a/old_version/old_version_0.4/config.h b/old_version/old_version_0.4/config.h
diff --git a/old_version/old_version_0.4/epoll.cpp b/old_version/old_version_0.4/epoll.cpp
diff --git a/old_version/old_version_0.4/epoll.h b/old_version/old_version_0.4/epoll.h
diff --git a/old_version/old_version_0.4/favicon.ico b/old_version/old_version_0.4/favicon.ico
diff --git a/old_version/old_version_0.4/improvement.txt b/old_version/old_version_0.4/improvement.txt
diff --git a/old_version/old_version_0.4/index.html b/old_version/old_version_0.4/index.html
diff --git a/old_version/old_version_0.4/main.cpp b/old_version/old_version_0.4/main.cpp
diff --git a/old_version/old_version_0.4/requestData.cpp b/old_version/old_version_0.4/requestData.cpp
diff --git a/old_version/old_version_0.4/requestData.h b/old_version/old_version_0.4/requestData.h
diff --git a/old_version/old_version_0.4/threadpool.cpp b/old_version/old_version_0.4/threadpool.cpp
diff --git a/old_version/old_version_0.4/threadpool.h b/old_version/old_version_0.4/threadpool.h
diff --git a/old_version/old_version_0.4/timer.cpp b/old_version/old_version_0.4/timer.cpp
diff --git a/old_version/old_version_0.4/timer.h b/old_version/old_version_0.4/timer.h
diff --git a/old_version/old_version_0.4/util.cpp b/old_version/old_version_0.4/util.cpp
diff --git a/old_version/old_version_0.4/util.h b/old_version/old_version_0.4/util.h
diff --git a/old_version/old_version_0.5/Makefile b/old_version/old_version_0.5/Makefile
diff --git a/old_version/old_version_0.5/Makefile1 b/old_version/old_version_0.5/Makefile1
diff --git a/old_version/old_version_0.5/base/condition.hpp b/old_version/old_version_0.5/base/condition.hpp
diff --git a/old_version/old_version_0.5/base/mutexLock.hpp b/old_version/old_version_0.5/base/mutexLock.hpp
diff --git a/old_version/old_version_0.5/base/nocopyable.hpp b/old_version/old_version_0.5/base/nocopyable.hpp
diff --git a/old_version/old_version_0.5/config.h b/old_version/old_version_0.5/config.h
diff --git a/old_version/old_version_0.5/epoll.cpp b/old_version/old_version_0.5/epoll.cpp
diff --git a/old_version/old_version_0.5/epoll.h b/old_version/old_version_0.5/epoll.h
diff --git a/old_version/old_version_0.5/favicon.ico b/old_version/old_version_0.5/favicon.ico
diff --git a/old_version/old_version_0.5/index.html b/old_version/old_version_0.5/index.html
diff --git a/old_version/old_version_0.5/main.cpp b/old_version/old_version_0.5/main.cpp
diff --git a/old_version/old_version_0.5/requestData.cpp b/old_version/old_version_0.5/requestData.cpp
diff --git a/old_version/old_version_0.5/requestData.h b/old_version/old_version_0.5/requestData.h
diff --git a/old_version/old_version_0.5/threadpool.cpp b/old_version/old_version_0.5/threadpool.cpp
diff --git a/old_version/old_version_0.5/threadpool.h b/old_version/old_version_0.5/threadpool.h
diff --git a/old_version/old_version_0.5/timer.cpp b/old_version/old_version_0.5/timer.cpp
diff --git a/old_version/old_version_0.5/timer.h b/old_version/old_version_0.5/timer.h
diff --git a/old_version/old_version_0.5/util.cpp b/old_version/old_version_0.5/util.cpp
diff --git a/old_version/old_version_0.5/util.h b/old_version/old_version_0.5/util.h
diff --git a/old_version/old_version_0.6/AsyncLogging.cpp b/old_version/old_version_0.6/AsyncLogging.cpp
diff --git a/old_version/old_version_0.6/AsyncLogging.h b/old_version/old_version_0.6/AsyncLogging.h
diff --git a/old_version/old_version_0.6/Condition.h b/old_version/old_version_0.6/Condition.h
diff --git a/old_version/old_version_0.6/CountDownLatch.cpp b/old_version/old_version_0.6/CountDownLatch.cpp
diff --git a/old_version/old_version_0.6/CountDownLatch.h b/old_version/old_version_0.6/CountDownLatch.h
diff --git a/old_version/old_version_0.6/CurrentThread.hpp b/old_version/old_version_0.6/CurrentThread.hpp
diff --git a/old_version/old_version_0.6/FileUtil.cpp b/old_version/old_version_0.6/FileUtil.cpp
diff --git a/old_version/old_version_0.6/FileUtil.h b/old_version/old_version_0.6/FileUtil.h
diff --git a/old_version/old_version_0.6/LogFile.cpp b/old_version/old_version_0.6/LogFile.cpp
diff --git a/old_version/old_version_0.6/LogFile.h b/old_version/old_version_0.6/LogFile.h
diff --git a/old_version/old_version_0.6/LogStream.cpp b/old_version/old_version_0.6/LogStream.cpp
diff --git a/old_version/old_version_0.6/LogStream.h b/old_version/old_version_0.6/LogStream.h
diff --git a/old_version/old_version_0.6/Logging.cpp b/old_version/old_version_0.6/Logging.cpp
diff --git a/old_version/old_version_0.6/Logging.h b/old_version/old_version_0.6/Logging.h
diff --git a/old_version/old_version_0.6/Makefile b/old_version/old_version_0.6/Makefile
diff --git a/old_version/old_version_0.6/Makefile1 b/old_version/old_version_0.6/Makefile1
diff --git a/old_version/old_version_0.6/MutexLock.h b/old_version/old_version_0.6/MutexLock.h
diff --git a/old_version/old_version_0.6/Thread.cpp b/old_version/old_version_0.6/Thread.cpp
diff --git a/old_version/old_version_0.6/Thread.h b/old_version/old_version_0.6/Thread.h
diff --git a/old_version/old_version_0.6/config.h b/old_version/old_version_0.6/config.h
diff --git a/old_version/old_version_0.6/epoll.cpp b/old_version/old_version_0.6/epoll.cpp
diff --git a/old_version/old_version_0.6/epoll.h b/old_version/old_version_0.6/epoll.h
diff --git a/old_version/old_version_0.6/favicon.ico b/old_version/old_version_0.6/favicon.ico
diff --git a/old_version/old_version_0.6/index.html b/old_version/old_version_0.6/index.html
diff --git a/old_version/old_version_0.6/main.cpp b/old_version/old_version_0.6/main.cpp
diff --git a/old_version/old_version_0.6/noncopyable.h b/old_version/old_version_0.6/noncopyable.h
diff --git a/old_version/old_version_0.6/requestData.cpp b/old_version/old_version_0.6/requestData.cpp
diff --git a/old_version/old_version_0.6/requestData.h b/old_version/old_version_0.6/requestData.h
diff --git a/old_version/old_version_0.6/threadpool.cpp b/old_version/old_version_0.6/threadpool.cpp
diff --git a/old_version/old_version_0.6/threadpool.h b/old_version/old_version_0.6/threadpool.h
diff --git a/old_version/old_version_0.6/timer.cpp b/old_version/old_version_0.6/timer.cpp
diff --git a/old_version/old_version_0.6/timer.h b/old_version/old_version_0.6/timer.h
diff --git a/old_version/old_version_0.6/util.cpp b/old_version/old_version_0.6/util.cpp
diff --git a/old_version/old_version_0.6/util.h b/old_version/old_version_0.6/util.h
diff --git a/测试及改进.md b/测试及改进.md
@@ -0,0 +1,32 @@
+# 测试及改进
+
+## 测试环境
+* OS：Ubuntu 14.04
+* 内存：8G
+* CPU：I7-4720HQ
+
+## 测试方法
+* 理想的测试环境是两台计算机，带宽无限，现在的网卡虽然都是千兆网卡，但是普通家用的网线都是5类双绞线，最高100Mbps,在linux下用ethtool可以看到网卡的速度被限制为100Mbsp，无法更改为更高的，经测试很容易跑满带宽，因此退而选择本地环境。
+* 使用工具Webbench，开启1000客户端进程，时间为60s
+* 分别测试短连接和长连接的情况
+* 关闭所有的输出及Log
+* 为避免磁盘IO对测试结果的影响，测试响应为内存中的"Hello World"字符加上必要的HTTP头
+* 我的最终版本中很多方面借鉴了muduo的思路，muduo中也提供了一个简单的HTTP echo测试，因此我将与muduo进行一个小小的对比，我修改了muduo测试的代码，使其echo相同的内容，关闭muduo的所有输出及Log
+* 线程池开启4线程
+* 因为发送的内容很少，为避免发送可能的延迟，关闭Nagle算法
+
+
+## 测试结果
+* WebServer短连接测试
+
+* muduo短连接测试
+
+* WebServer长连接测试
+* muduo长连接测试
+
+* WebServer空闲负载
+* WebServer短连接CPU负载
+* WebServer长连接CPU负载
+
+
+## 结果分析
diff --git a/连接的建立与断开.md b/连接的建立与断开.md
@@ -0,0 +1,33 @@
+# 连接维护(针对非阻塞IO)
+
+### 建立连接
+
+* 建立连接的过程  
+连接的建立比较简单，server端通过socket()，bind()，listen()，并使用epoll ET模式监听listenfd的读请求，当TCP连接完成3次握手后，会触发listenfd的读事件，应用程序调用accept()，会检查已完成的连接队列，如果队列里有连接，就返回这个连接，出错或连接为空时返回-1。此时，已经可以进行正常的读写操作了。 当然，因为是ET模式，accept()要一直循环到就绪连接为空。
+* 分析  
+之所以说建立连接的过程比较简单，是因为数据的通信已经由操作系统帮我们完成了，这里的通信是指3次握手的过程，这个过程不需要应用程序参与，当应用程序感知到连接时，此时该连接已经完成了3次握手的过程，accept就好了。另一个原因是一般情况下，连接的建立都是client发起的，server端被动建立连接就好了，也不会出现同时建立的情况。
+* 限制  
+假设server只监听一个端口，一个连接就是一个四元组(原ip，原port，对端ip, 对端port)，那么理论上可以建立2^48个连接，可是，fd可没有这么多(操作系统限制、用户进程限制)。当连接满了，如果空等而不连接，那么就绪队列也满了后，会导致新连接无法建立。这里的做法我参考了muduo，准备一个空的文件描述符，accept()后直接close()，这样对端不会收到RST，至少可以知道服务器正在运行。
+
+### 关闭连接
+
+相对于连接的建立，关闭连接则复杂的多，远不是一个close()那么简单，关闭连接要优雅。
+
+##### 什么时候关闭连接？
+通常server和client都可以主动发Fin来关闭连接  
+
+* 对于client(非Keep-Alive)，发送完请求后就可以shutdown()写端，然后收到server发来的应答，最后close掉连接。也可以不shutdown()写，等读完直接close。对于Keep-Alive的情况，就要看client的心情了，收到消息后可以断，也可以不断，server应该保证不主动断开。
+
+* 对于server端，毫无疑问应该谨慎处理以上所有情况。具体说来:
+> * 出现各种关于连接的错误时，可以直接close()掉
+> * 短连接超时的请求，可以直接close()
+> * 长连接对方长时间没有请求(如果没有保活机制)，可以close()
+> * client发出Fin，server应当把消息发完，然后才可以close()
+> * 短连接正常结束，server可以close，也可以不close，大多数的实现是不close的(对HTTP1.1而言)
+
+
+##### EPOLLIN触发但是read()返回0的情况
+
+这种情况通常有两个原因:
+> * 对端已经关闭了连接，这时再写该fd会出错，此时应该关闭连接
+> * 对端只是shutdown()了写端，告诉server我已经写完了，但是还可以接收信息。server应该在写完所有的信息后再关闭连接。更优雅的做法是透明的传递这个行为，即server顺着关闭读端，然后发完数据后关闭。
diff --git a/项目目的.md b/项目目的.md
@@ -0,0 +1,21 @@
+# 项目目的
+---
+### 最初的想法
+本项目是我在三星电子(中国)研发中心实习期间利用晚上和周末的时间完成的，实习期间我负责4K分辨率双鱼眼摄像头视频拼接的算法设计与实现，我希望能把其中的图像拼接部分的成果通过Web的方式展示出来，但因为涉及保密协议，不得不放弃这一想法。
+
+### Web服务器能够很好的贯穿所学的知识
+但是，Web服务器能够很好的贯穿之前所学的知识，之前看过的《C++ Primer》、《Effevtive C++》、《STL源码剖析》、《深度探索C++对象模型》、《TCP\IP详解卷1》、APUE、UNP，还包括了《后台开发核心技术与应用实践》等书，涵盖了  
+
+* TCP、HTTP协议
+* 多进程多线程
+* IO
+* 锁
+* 通信
+* C++语法
+* 编程规范
+* Linux环境下各种工具的使用
+* 版本控制Git
+* Makefile和CMakeLists文件的编写
+* 自动化构建工具Travis CI的使用
+
+最终的版本在很多方面学习了muduo网络库，在看完陈硕的《Linux多线程服务端编程》后，对照着书把muduo的源码读了几遍，并重构了自己的服务器，最终的很多想法借鉴了muduo的思想。