├── .gitignore ├── C++ ├── common │ ├── 1. const.pdf │ └── 1. const.xmind ├── concurrent │ ├── 1. Linux 进程、线程与调度.pdf │ ├── 1. Linux进程、线程与调度.xmind │ ├── 2. 线程的创建与执行.pdf │ ├── 2. 线程的创建与执行.xmind │ ├── 3. async与future.pdf │ ├── 3. async与future.xmind │ ├── 4. 互斥量、lock_guard与unique_lock.pdf │ ├── 4. 互斥量、lock_guard与unique_lock.xmind │ ├── 5. 通知状态的改变—POSIX条件变量.pdf │ ├── 5. 通知状态的改变—POSIX条件变量.xmind │ ├── 6. 通知状态的改变—C++条件变量.pdf │ ├── 6. 通知状态的改变—C++条件变量.xmind │ ├── 7. POSIX 信号量.pdf │ └── 7. POSIX信号量.xmind ├── copy-control │ ├── 1. 拷贝构造与拷贝赋值.pdf │ ├── 1. 拷贝构造与拷贝赋值.xmind │ ├── 2. 左值、右值和移动语义.xmind │ ├── 2. 左值与右值.pdf │ ├── 3. 移动构造与移动赋值.pdf │ ├── 3. 移动构造与移动赋值.xmind │ ├── 4. 三五法则.pdf │ └── 4. 三五法则.xmind ├── functional │ ├── 1. lambda 表达式.pdf │ ├── 1. lambda 表达式.xmind │ ├── 2. 可调用对象 function.pdf │ └── 2. 可调用对象—function.xmind ├── smart-ptr │ ├── 1. C++管理资源的方式.xmind │ ├── 1. 堆、栈与 RAII.pdf │ ├── 2. RAII与智能指针.pdf │ ├── 2. RAII与智能指针.xmind │ ├── 3. shared_ptr.pdf │ └── 3. shared_ptr.xmind ├── template │ ├── 1. Template.pdf │ ├── 1. Template的基本使用.xmind │ ├── 2. 万能引用与类型推断问题.pdf │ ├── 2. 万能引用与类型推断问题.xmind │ ├── 3. 完美转发.pdf │ └── 3. 完美转发.xmind └── type │ ├── 1. 强制类型转换.pdf │ ├── 1. 强制类型转换.xmind │ ├── 2. 自动类型推断—auto.xmind │ ├── 2. 自动类型推断（auto）.pdf │ ├── 3. decltype.pdf │ └── 3. decltype.xmind ├── Distributed-System ├── Basic Paxos.pdf ├── Basic Paxos.xmind ├── Gossip.pdf ├── Gossip.xmind ├── Raft.pdf ├── Raft.xmind ├── roadmap.png ├── 拜占庭将军问题.pdf └── 拜占庭将军问题.xmind ├── Linux-Network ├── 1. 信号.xmind ├── 10. epoll 原理剖析.xmind ├── 11. epoll_event.xmind ├── 12. HTTPS.xmind ├── 13. nginx.xmind ├── 2. 信号集与信号掩码.xmind ├── 3. 进程的创建.xmind ├── 4. DAEMON.xmind ├── 5. 进程间通讯简介.xmind ├── 6. 可靠传输协议—TCP.xmind ├── 7. TCP拥塞控制.xmind ├── 8. socket 编程问题一览(01).xmind ├── 9. socket 编程问题一览(02).xmind ├── DAEMON.pdf ├── HTTPS.pdf ├── TCP拥塞控制.pdf ├── epoll 原理剖析.pdf ├── epoll_event.pdf ├── nginx.pdf ├── socket 编程问题一览(01).pdf ├── socket 编程问题一览(02).pdf ├── 信号.pdf ├── 信号集与信号掩码.pdf ├── 可靠传输协议—TCP.pdf ├── 进程的创建.pdf └── 进程间通讯简介.pdf ├── Operating-System ├── Linux-Virtual-Memory.pdf └── Linux-Virtual-Memory.xmind ├── Psyduck.png ├── README.md ├── base-questions ├── README.md ├── images │ ├── 1619766123992.png │ ├── 1619767874908.png │ ├── 1620475785744.png │ ├── 1620610060394.png │ └── 1620785460173.png └── network │ ├── Enter-URL-On-Browser.md │ ├── HTTP-And-HTTPS.md │ ├── SYN-Flood.md │ ├── TCP-And-UDP.md │ ├── TCP-Connect-And-Close.md │ └── TCP-Reliability.md ├── database ├── InnoDB Group Commit.pdf ├── InnoDB Group Commit.xmind ├── InnoDB-Page.pdf ├── InnoDB-Page.xmind ├── InnoDB-WAL.pdf ├── InnoDB-WAL.xmind ├── InnoDB-undo-log与MVCC.pdf ├── InnoDB-undo-log与MVCC.xmind ├── MySQL Cost Based Optimizer.pdf ├── MySQL Cost Based Optimizer.xmind ├── MySQL JOIN 工作原理浅析.pdf ├── MySQL JOIN 工作原理浅析.xmind ├── Redis 主从复制.pdf ├── Redis 主从复制.xmind ├── Redis数据结构.pdf ├── Redis数据结构.xmind ├── etcd概述.pdf ├── etcd概述.xmind ├── 为什么MySQL使用B+Tree.pdf ├── 为什么MySQL使用B+Tree.xmind ├── 主键的选择.pdf ├── 主键的选择.xmind ├── 全局锁、表级锁以及行锁（上）.pdf ├── 全局锁、表级锁以及行锁（上）.xmind ├── 全局锁、表级锁以及行锁（下）.pdf ├── 全局锁、表级锁以及行锁（下）.xmind ├── 全局锁、表级锁以及行锁（中）.pdf ├── 全局锁、表级锁以及行锁（中）.xmind ├── 深入浅出 InnoDB Index.pdf ├── 深入浅出 InnoDB Index.xmind ├── 缓存更新的策略.pdf └── 缓存的更新策略.xmind ├── deliberate ├── 01. smart_ptr │ ├── main.cpp │ └── smart_ptr.hpp ├── 02. blocking_queue │ ├── blocking_queue.hpp │ └── main.cpp └── 03. signal_process │ └── main.c ├── go-concurrency ├── channel │ ├── alternately_print_test.go │ └── goroutine_leak_test.go ├── go.mod ├── memory │ └── memory_reordering_test.go └── mutex │ ├── mutex_test.go │ ├── once_test.go │ ├── race_test.go │ └── rwmutex_test.go ├── golang ├── G-M-P模型.pdf ├── G-M-P模型.xmind ├── GC.pdf ├── GC.xmind ├── channel.pdf ├── channel.xmind ├── map.pdf └── map.xmind ├── kubernetes ├── 为什么需要 Pod.pdf ├── 为什么需要 Pod.xmind ├── 声明式 API 是如何实现的.pdf └── 声明式 API 是如何实现的.xmind ├── materials ├── GMP.drawio ├── HTTPS.drawio ├── MQ-Design.drawio ├── MySQL-Join.drawio ├── README.md ├── docker.drawio ├── golang-map-and-channel.drawio ├── k8s.drawio ├── nginx-data-structure.drawio ├── nginx.drawio ├── paxos.drawio ├── redis-replication.drawio └── redo-log&binlog.drawio └── middleware ├── RabbitMQ.pdf └── RabbitMQ.xmind /.gitignore: -------------------------------------------------------------------------------- 1 | .idea/ -------------------------------------------------------------------------------- /C++/common/1. const.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cch123/Psyduck/9067a69692cd1a9c6f93b1ae5c5f073c8ff8b2a9/C++/common/1. const.pdf -------------------------------------------------------------------------------- /C++/common/1. const.xmind: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cch123/Psyduck/9067a69692cd1a9c6f93b1ae5c5f073c8ff8b2a9/C++/common/1. const.xmind -------------------------------------------------------------------------------- /C++/concurrent/1. 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-------------------------------------------------------------------------------- 1 | 2 | # Psyduck 3 | 4 | 另一个用 XMind 记录 CS 基础问题的地方，同样提供了 `.xmind` 源文件以及导出的 `.pdf` 文件，XMind 版本为「XMind 2020」。 5 | 6 | 在 2020 年时，曾花了约 2 个月的时间整理了第一份 XMind 知识库: [ZeroMind](https://github.com/SmartKeyerror/ZeroMind)。 7 | 之所以额外创建一个 Repo 干同样的事情，是因为一方面自己的审美发生了变化，另一方面则是对那些最重要但基础的问题有了更深刻地理解。 8 | 9 | 温故而知新，孔子诚不欺我。在整理基础知识点的过程中，对诸如 CFS-vruntime、POSIX 条件变量、TCP 和 epoll 等内容有了自己的理解，有一种恍然大悟的感觉。 10 | 11 | 之所以使用 XMind 来记录这些内容，是因为我非常喜欢《火星救援》里面的一句台词: 12 | 13 | > 有时候，所有的情况都会对你不利。所有的坏事一起发生，你就可能会想，就是这样了，这就是我的终点了。面对这种情况，你要么接受，要么想办法解决，这就是一切的真谛。解决问题，你想各种办法，解决一个问题，然后接着解决下一个问题，循环往复，等你解决了足够多的问题，你就可以回家了。 14 | 15 | 也就是说，面对一个大问题时需要学会将其分解成一个一个的小问题，然后逐一地处理，即"分而治之"。下面是一些图片，可以帮助你更好地了解这个项目做了什么: 16 | 17 | ![](Psyduck.png) 18 | 19 | ------ 20 | 21 | 22 | ## :high_brightness: 目录 23 | 24 | - [Database](#bento-Database) 25 | - [Distributed System](#rocket-Distributed-System) 26 | - [Middleware](#alembic-middleware) 27 | - [Linux Network Programing](#fire-Linux-Network-Programing) 28 | - [Operating System](#zap-Operating-System) 29 | - [Golang](#paw_prints-Golang) 30 | - [Kubernetes](#art-Kubernetes) 31 | - [C++](#telescope-C++) 32 | 33 | ------ 34 | 35 | ## :bento: Database 36 | 37 | ### MySQL 38 | - [为什么 MySQL 使用 B+Tree?](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/%E4%B8%BA%E4%BB%80%E4%B9%88MySQL%E4%BD%BF%E7%94%A8B%2BTree.pdf) 39 | - [InnoDB 数据页结构](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/InnoDB-Page.pdf) 40 | - [深入浅出 InnoDB Index](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/%E6%B7%B1%E5%85%A5%E6%B5%85%E5%87%BA%20InnoDB%20Index.pdf) 41 | - [InnoDB WAL](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/InnoDB-WAL.pdf) 42 | - [InnoDB Group Commit](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/InnoDB%20Group%20Commit.pdf) 43 | - [InnoDB undo log 与 MVCC](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/InnoDB-undo-log%E4%B8%8EMVCC.pdf) 44 | - [全局锁、表级锁以及行锁（上）](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/%E5%85%A8%E5%B1%80%E9%94%81%E3%80%81%E8%A1%A8%E7%BA%A7%E9%94%81%E4%BB%A5%E5%8F%8A%E8%A1%8C%E9%94%81%EF%BC%88%E4%B8%8A%EF%BC%89.pdf) 45 | - [全局锁、表级锁以及行锁（中）](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/%E5%85%A8%E5%B1%80%E9%94%81%E3%80%81%E8%A1%A8%E7%BA%A7%E9%94%81%E4%BB%A5%E5%8F%8A%E8%A1%8C%E9%94%81%EF%BC%88%E4%B8%AD%EF%BC%89.pdf) 46 | - [全局锁、表级锁以及行锁（下）](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/%E5%85%A8%E5%B1%80%E9%94%81%E3%80%81%E8%A1%A8%E7%BA%A7%E9%94%81%E4%BB%A5%E5%8F%8A%E8%A1%8C%E9%94%81%EF%BC%88%E4%B8%8B%EF%BC%89.pdf) 47 | - [主键的选择](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/%E4%B8%BB%E9%94%AE%E7%9A%84%E9%80%89%E6%8B%A9.pdf) 48 | - [MySQL Cost-Based Optimizer](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/MySQL%20Cost%20Based%20Optimizer.pdf) 49 | - [MySQL Join 工作原理浅析](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/MySQL%20JOIN%20%E5%B7%A5%E4%BD%9C%E5%8E%9F%E7%90%86%E6%B5%85%E6%9E%90.pdf) 50 | 51 | ### Others 52 | 53 | - [Redis 数据结构](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/Redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84.pdf) 54 | - [Redis 主从复制原理](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/Redis%20%E4%B8%BB%E4%BB%8E%E5%A4%8D%E5%88%B6.pdf) 55 | - [缓存更新的策略](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/%E7%BC%93%E5%AD%98%E6%9B%B4%E6%96%B0%E7%9A%84%E7%AD%96%E7%95%A5.pdf) 56 | - [etcd 概述](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/database/etcd%E6%A6%82%E8%BF%B0.pdf) 57 | 58 | ------ 59 | 60 | ## :rocket: Distributed System 61 | 62 | ### 分布式协议与算法 63 | 64 | ![](Distributed-System/roadmap.png) 65 | 66 | - [拜占庭将军问题（共识）](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/distributed-system/%E6%8B%9C%E5%8D%A0%E5%BA%AD%E5%B0%86%E5%86%9B%E9%97%AE%E9%A2%98.pdf) 67 | - [Basic Paxos](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/distributed-system/Basic%20Paxos.pdf) 68 | - [Raft——领导选举与日志复制](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/distributed-system/Raft.pdf) 69 | - [Gossip——流言蜚语实现最终一致性](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/distributed-system/Gossip.pdf) 70 | 71 | --- 72 | 73 | ## :alembic: Middleware 74 | 75 | - [可靠消息中间件——RabbitMQ](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/middleware/RabbitMQ.pdf) 76 | 77 | ------ 78 | 79 | ## :fire: Linux-Network-Programing 80 | 81 | - [信号](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/%E4%BF%A1%E5%8F%B7.pdf) 82 | - [信号集与信号掩码](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/%E4%BF%A1%E5%8F%B7%E9%9B%86%E4%B8%8E%E4%BF%A1%E5%8F%B7%E6%8E%A9%E7%A0%81.pdf) 83 | - [进程的创建](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/%E8%BF%9B%E7%A8%8B%E7%9A%84%E5%88%9B%E5%BB%BA.pdf) 84 | - [进程间通讯简介](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/%E8%BF%9B%E7%A8%8B%E9%97%B4%E9%80%9A%E8%AE%AF%E7%AE%80%E4%BB%8B.pdf) 85 | - [DAEMON](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/DAEMON.pdf) 86 | - [可靠数据传输协议——TCP](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/%E5%8F%AF%E9%9D%A0%E4%BC%A0%E8%BE%93%E5%8D%8F%E8%AE%AE%E2%80%94TCP.pdf) 87 | - [TCP 拥塞控制](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/TCP%E6%8B%A5%E5%A1%9E%E6%8E%A7%E5%88%B6.pdf) 88 | - [socket 编程问题一览(01)](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/socket%20%E7%BC%96%E7%A8%8B%E9%97%AE%E9%A2%98%E4%B8%80%E8%A7%88%2801%29.pdf) 89 | - [socket 编程问题一览(02)](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/socket%20%E7%BC%96%E7%A8%8B%E9%97%AE%E9%A2%98%E4%B8%80%E8%A7%88%2802%29.pdf) 90 | - [epoll 原理剖析](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/epoll%20%E5%8E%9F%E7%90%86%E5%89%96%E6%9E%90.pdf) 91 | - [epoll_event](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/epoll_event.pdf) 92 | - [HTTPS 握手过程](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/HTTPS.pdf) 93 | - [Nginx 基本进程模型与核心数据结构](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/nginx.pdf) 94 | 95 | ------ 96 | 97 | ## :zap: Operating System 98 | 99 | - [Linux 虚拟内存](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/operating-system/Linux-Virtual-Memory.pdf) 100 | 101 | ------ 102 | 103 | ## :paw_prints: Golang 104 | 105 | - [channel 的设计与使用](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/golang/channel.pdf) 106 | - [map 的设计与扩容时机](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/golang/map.pdf) 107 | - [G-M-P 模型](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/golang/G-M-P%E6%A8%A1%E5%9E%8B.pdf) 108 | - [三色标记-清除式 GC](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/golang/GC.pdf) 109 | 110 | ------ 111 | 112 | ## :art: Kubernetes 113 | 114 | - [为什么需要 Pod?](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/kubernetes/%E4%B8%BA%E4%BB%80%E4%B9%88%E9%9C%80%E8%A6%81%20Pod.pdf) 115 | - [声明式 API 是如何实现的?](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/kubernetes/%E5%A3%B0%E6%98%8E%E5%BC%8F%20API%20%E6%98%AF%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E7%9A%84.pdf) 116 | 117 | ------ 118 | 119 | ## :telescope: C++ 120 | 121 | #### common 122 | 123 | - [const](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/common/1.%20const.pdf) 124 | 125 | #### 面向对象程序设计 126 | 127 | TODO 128 | 129 | #### 拷贝控制 130 | 131 | - [拷贝构造与拷贝赋值](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/copy-control/1.%20%E6%8B%B7%E8%B4%9D%E6%9E%84%E9%80%A0%E4%B8%8E%E6%8B%B7%E8%B4%9D%E8%B5%8B%E5%80%BC.pdf) 132 | - [左值与右值](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/copy-control/2.%20%E5%B7%A6%E5%80%BC%E4%B8%8E%E5%8F%B3%E5%80%BC.pdf) 133 | - [移动构造与移动赋值](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/copy-control/3.%20%E7%A7%BB%E5%8A%A8%E6%9E%84%E9%80%A0%E4%B8%8E%E7%A7%BB%E5%8A%A8%E8%B5%8B%E5%80%BC.pdf) 134 | - [三/五法则](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/copy-control/4.%20%E4%B8%89%E4%BA%94%E6%B3%95%E5%88%99.pdf) 135 | 136 | #### 模板与泛型编程 137 | 138 | - [Template 的基本使用](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/template/1.%20Template.pdf) 139 | - [万能引用与类型推断问题](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/template/2.%20%E4%B8%87%E8%83%BD%E5%BC%95%E7%94%A8%E4%B8%8E%E7%B1%BB%E5%9E%8B%E6%8E%A8%E6%96%AD%E9%97%AE%E9%A2%98.pdf) 140 | - [完美转发](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/template/3.%20%E5%AE%8C%E7%BE%8E%E8%BD%AC%E5%8F%91.pdf) 141 | 142 | #### 类型相关 143 | 144 | - [强制类型转换](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/type/1.%20%E5%BC%BA%E5%88%B6%E7%B1%BB%E5%9E%8B%E8%BD%AC%E6%8D%A2.pdf) 145 | - [自动类型推断（auto）](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/type/2.%20%E8%87%AA%E5%8A%A8%E7%B1%BB%E5%9E%8B%E6%8E%A8%E6%96%AD%EF%BC%88auto%EF%BC%89.pdf) 146 | - [decltype](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/type/3.%20decltype.pdf) 147 | 148 | #### 函数编程 149 | 150 | - [lambda 表达式](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/functional/1.%20lambda%20%E8%A1%A8%E8%BE%BE%E5%BC%8F.pdf) 151 | - [可调用对象——std::function](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/functional/2.%20%E5%8F%AF%E8%B0%83%E7%94%A8%E5%AF%B9%E8%B1%A1%20function.pdf) 152 | 153 | #### 智能指针 154 | 155 | - [堆、栈与 RAII: C++ 管理资源的方式](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/smart-ptr/1.%20%E5%A0%86%E3%80%81%E6%A0%88%E4%B8%8E%20RAII%20%3A%20C%2B%2B%20%E7%AE%A1%E7%90%86%E8%B5%84%E6%BA%90%E7%9A%84%E6%96%B9%E5%BC%8F.pdf) 156 | - [RAII 与智能指针](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/smart-ptr/2.%20RAII%E4%B8%8E%E6%99%BA%E8%83%BD%E6%8C%87%E9%92%88.pdf) 157 | - [shared_ptr](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/smart-ptr/3.%20shared_ptr.pdf) 158 | 159 | #### 并发编程 160 | 161 | - [Linux 进程、线程与调度](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/concurrent/1.%20Linux%20%E8%BF%9B%E7%A8%8B%E3%80%81%E7%BA%BF%E7%A8%8B%E4%B8%8E%E8%B0%83%E5%BA%A6.pdf) 162 | - [线程的创建与执行](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/concurrent/2.%20%E7%BA%BF%E7%A8%8B%E7%9A%84%E5%88%9B%E5%BB%BA%E4%B8%8E%E6%89%A7%E8%A1%8C.pdf) 163 | - [std::async 与 std::future](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/concurrent/3.%20async%E4%B8%8Efuture.pdf) 164 | - [互斥量与 std::lock_guard、std::unique_lock](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/concurrent/4.%20%E4%BA%92%E6%96%A5%E9%87%8F%E3%80%81lock_guard%E4%B8%8Eunique_lock.pdf) 165 | - [通知状态的改变——POSIX 条件变量](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/concurrent/5.%20%E9%80%9A%E7%9F%A5%E7%8A%B6%E6%80%81%E7%9A%84%E6%94%B9%E5%8F%98%E2%80%94POSIX%E6%9D%A1%E4%BB%B6%E5%8F%98%E9%87%8F.pdf) 166 | - [通知状态的改变——C++ 条件变量](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/concurrent/6.%20%E9%80%9A%E7%9F%A5%E7%8A%B6%E6%80%81%E7%9A%84%E6%94%B9%E5%8F%98%E2%80%94C%2B%2B%E6%9D%A1%E4%BB%B6%E5%8F%98%E9%87%8F.pdf) 167 | - [POSIX 信号量](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/concurrent/7.%20POSIX%20%E4%BF%A1%E5%8F%B7%E9%87%8F.pdf) 168 | 169 | #### 编译与链接 170 | 171 | - [编译与链接](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/c%2B%2B/compile/1.%20%E7%BC%96%E8%AF%91%E4%B8%8E%E9%93%BE%E6%8E%A5.pdf) 172 | 173 | ------ 174 | 175 | -------------------------------------------------------------------------------- /base-questions/README.md: -------------------------------------------------------------------------------- 1 | 2 | 3 | ## Network 4 | 5 | - [简述 TCP 三次握手以及四次挥手的流程。为什么需要三次握手以及四次挥手？](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/TCP-Connect-And-Close.md) 6 | 7 | - [TCP 中 SYN 攻击是什么？如何防止？](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/SYN-Flood.md) 8 | 9 | - [TCP 与 UDP 在网络协议中的哪一层，他们之间有什么区别？](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/TCP-And-UDP.md) 10 | 11 | - [TCP 怎么保证可靠传输？](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/TCP-Reliability.md) 12 | 13 | - [HTTP 与 HTTPS 有哪些区别？](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/HTTP-And-HTTPS.md) 14 | 15 | - [简述 HTTPS 的加密与认证过程](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/HTTP-And-HTTPS.md) 16 | 17 | - [简述对称与非对称加密的概念](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/HTTP-And-HTTPS.md) 18 | 19 | - [从输入 URL 到展现页面的全过程](https://github.com/SmartKeyerror/Psyduck/blob/master/base-questions/network/Enter-URL-On-Browser.md) -------------------------------------------------------------------------------- /base-questions/images/1619766123992.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cch123/Psyduck/9067a69692cd1a9c6f93b1ae5c5f073c8ff8b2a9/base-questions/images/1619766123992.png 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地址放入到网络包内返回。若没有查找，则将当前 DNS 服务器的下层 DNS 服务器地址放回网络包中返回。 8 | 3. 客户端收到 DNS 的数据包以后，若得到的域名对应的 IP 地址则进行下一步。否则使用 DNS 服务器返回的下层 DNS 服务器 IP 地址，继续查询，直到查询到域名对应的 IP。或者根本没有这个域名，浏览器直接给出提示。 9 | 10 | ### 2. TCP 连接建立 11 | 12 | 1. 客户端向服务端发送带有 SYN 标志位以及一个随机的 Seq 序列号（X）的 TCP 数据包，目的端口号为 80，并将自己的 MSS大小、接收窗口大小（Win）一并放入数据包内，请求建立连接。 13 | 2. 服务端在收到客户端发来的 SYN 包以后，生成带有 SYN + ACK 标志的数据包，设置 Ack 确认号为 Seq + 1，并生成一个随机的 Seq 序列号（Y），与服务端 MSS大小、接收窗口大小（Win）一起添加至该数据包内，回送至客户端。 14 | 3. 客户端收到服务端发送的 SYN + ACK 数据包以后，需要回复确认包。即发送一个带有 ACK 标志位的数据包，此时 Seq 序列号为 X + 1，Ack 确认号为 Y + 1。连接已建立，开始正式传输 HTTP 数据。 15 | 16 | 17 | ### 3. 数据传输 18 | 19 | 浏览器将 URL 中的 URI、请求头等信息添加至 HTTP 数据包中，并设置请求方法为 GET，通过上面建立的 TCP 连接发出。服务端收到该数据包后进行处理，并返回浏览器所需要的数据。数据传输至浏览器以后，浏览器不断地从 TCP 缓冲区中读取数据，组成 response。 20 | 21 | ### 4. 数据渲染 22 | 23 | 浏览器根据 response 中的 HTML 文本内容开始进行渲染，并请求嵌入至 HTML 的相关资源，如 CSS、JS、图片、视频或者是音频等。 24 | -------------------------------------------------------------------------------- /base-questions/network/HTTP-And-HTTPS.md: -------------------------------------------------------------------------------- 1 | 2 | 3 | ## HTTP 与 HTTPS 有哪些区别？ 4 | 5 | 1. 监听端口不同，HTTP 监听 80 端口，HTTPS 监听 443 端口。 6 | 2. HTTP 使用明文传输，在传输用户数据、支付数据等敏感信息时很容易被窃取。HTTPS 则是建立在 SSL/TSL 之上的安全 HTTP 协议，通信数据均使用非对称加密/对称加密算法进行加密，数据在网络上传输更安全。 7 | 3. 因为 HTTPS 需要对数据进行加密、解密，所以其实际运行效率要低于 HTTP 协议本身。并且 HTTPS 除了标准的 TCP 三次握手以外，还需要额外的四次 TLS 握手，建立连接需要花费更多时间。 8 | 9 | 10 | ### 对称加密与非对称加密 11 | 12 | 在对称加密中，加密和解密的密钥是相同的。也就是说，使⽤“⼩鸡炖蘑菇”这句话既可以对信息进⾏加密，也可以⽤来解密加密后的字符串。因此，在使⽤对称加密时，密钥⼀定不能被别⼈知道。 13 | 14 | 在非对称加密中，加密和解密的密钥是不相同的。**公钥加密的信息，只有私钥才能解开。私钥加密的信息，只有公钥才能解开。** 15 | 16 | 因为对称加密的过程要比非对称加密的过程简单，所以效率要高的多，性能也好，因此在交互场所通常使用对称加密。在少量信息传输场景中可使用非对称加密来保证身份的准确性。例如在 Github 中我们上传自己的公钥，并在本地保留私钥，双方进行短暂的数据交换。 17 | 18 | 19 | ### TLS 握手过程 20 | 21 | 1. 客户端向服务端发送 Client Hello，并将自身支持的 TLS/SSL 协议版本号、支持的加密算法以及生成的随机字数 `clientRandNum` 一起发送给服务端。 22 | 2. 服务端在收到 Client Hello 以后，向客户端发送 Server Hello，并携带**特定**的协议版本、加密算法以及服务端生成的随机数 `serverRandNum`、数字证书发送给客户端。 23 | 3. 客户端收到 Server Hello 数据包以后，首先验证证书的有效性。例如证书是否过期、域名是否正确、证书拥有者是否正确等等，并且还会使用预装的 CA 公钥去解密证书中包含的签名(Signature)，并与证书中的哈希摘要进行比对。验证成功后则再次生成一个随机字符串 `pre-master`， 即 Pre Master Secret，预主密钥，通过公钥进行加密，发送给服务端。服务端使用自己的私钥对其进行解密。 24 | 4. 而后，客户端与服务端使用前面的 `clientRandNum`，`serverRandNum` 以及 `pre-master` 这三个随机数生成对称加密密钥，后续所有的数据交互均使用该密钥进行对称加密通信。 25 | 26 | ![Alt text](../images/1620610060394.png) -------------------------------------------------------------------------------- /base-questions/network/SYN-Flood.md: -------------------------------------------------------------------------------- 1 | 2 | 3 | ## TCP 中 SYN 攻击是什么？如何防止？ 4 | 5 | SYN Flood 攻击是指利用了 TCP 协议的漏洞，攻击者操控多台傀儡机在短时间内向服务器发送海量伪造的带有 SYN 标志位的数据包，从而造成服务端状态为 `SYN_RECV` 的队列溢出，导致无法正常处理其它正常网络请求的一种 DoS 攻击。 6 | 7 | ![Alt text](../images/1619766123992.png) 8 | 9 | 在正常情况下，当服务端收到客户端发来的 SYN 数据包以后，会将 socket 状态更新为 `SYN_RECV` 并保存在监听队列的未完成连接队列中，并向客户端回送 SYN+ACK 数据包，而后客户端向服务端发送 ACK 确认包，服务端收到该确认包以后，socket 状态由 `SYN_RECV` 更新至 `ESTABLISHED`，表示 TCP 连接已建立，并将该 socket 从未完成连接队列中移入至已完成连接队列中，等待应用程序调用 `accept()` 取出。 10 | 11 | 当服务端遭受 SYN Flood 攻击时，完成连接队列很有可能会溢出，导致服务端无法再处理其它请求。所以这种攻击也被称之为 Dos 攻击，即 Denial Of Service Attack，拒绝服务攻击，使服务器拒绝向正常用户提供服务。 12 | 13 | ### SYN Flood 攻击防治方法 14 | 15 | 1. 启用 SYN Cookie 16 | 17 | 当我们将内核的 `net.ipv4.tcp_syncookies` 设置为 1 时，表示启用 SYN Cookie。此时当服务端收到 SYN 数据包以后，不再将该 socket 保存在未完成连接队列中，并且使用基于时间种子的随机方式进行生成 Seq 序列号，服务端将带有该 Seq 以及 SYN+ACK 的 TCP 数据包回送给客户端。服务端在收到 ACK 确认包以后，会使用 Cookie 检验算法来鉴定 Ack 确认号与发送的 Seq 序列号是否匹配，鉴定通过则完成握手，并将连接放置于已完成连接队列中，失败则直接丢弃。 18 | 19 | 2. 调整 SYN 最大队列长度 20 | 21 | 也可以通过设置 `net.ipv4.tcp_max_syn_backlog` 来将未完成连接队列的容量增大，使得半连接队列不会那么快的溢出。 22 | 23 | 3. 减少 SYN+ACK 的最大重试次数 24 | 25 | 傀儡机有时根本就不会去响应服务端发送的 SYN+ACK 数据包，那么服务端因为迟迟没有收到客户端发来的 ACK 确认包，会不断地重新发送 SYN+ACK 数据包，系统默认为 5 次。我们可以通过设置 `net.ipv4.tcp_synack_retries` 来调整最大重试次数，比如将其降为 2 或者是 3。 26 | 27 | 4. 使用 `iptables` 对数据包进行过滤 28 | 29 | 可以使用 `iptables` 来限制单个 IP 的最大并发数，单个地址的最大连接数，以及单位时间内的连接数。 30 | 31 | 5. 使用代理服务器进行拦截 32 | 33 | 一种分工的策略，代理服务器专门进行 DDos 的防护，使后方服务器能够专注于自身的业务，而无需对硬件或内核进行特殊配置。 34 | 35 | ![Alt text](../images/1620785460173.png) 36 | 37 | 以 Google Cloud Armor 为例，当用户向服务器发起 SYN 请求时，流量并不会直接进入到服务器，而是首先进入云平台的边缘节点，进行负载均衡、黑/白名单过滤，也就是说，这些边缘节点就像护城河一样为整座城提供防护功能。这样一来，开发人员可专注于实现自己的功能上面，而不需要再去担心网络防护问题。 -------------------------------------------------------------------------------- /base-questions/network/TCP-And-UDP.md: -------------------------------------------------------------------------------- 1 | 2 | ## TCP 与 UDP 在网络协议中的哪一层，他们之间有什么区别？ 3 | 4 | TCP 和 UDP 均在传输层。 5 | 6 | ### TCP 和 UDP 之间的区别 7 | 8 | 1. TCP 是面向连接协议，而 UDP 则是无连接协议。也就是说，在使用 TCP 发送数据时需要首先经过三次握手建立连接，服务端与客户端交换序列号、MSS 大小以及接收窗口大小等信息。 9 | 2. TCP 是可靠连接协议，协议实现保证数据包在丢失后进行重传，保证数据传输的可靠性。而 UDP 则不对此进行保证，可能会发生数据丢失的情况。 10 | 3. TCP 为字节流协议，数据以流的方式进行传输，客户端和服务端需要制定数据包格式。UDP 则是数据报协议，发送一个，接收一个，只有接收缓冲区， 没有发送缓冲区。 11 | 4. UDP 可用于广播，TCP 只能进行双节点间通信。 -------------------------------------------------------------------------------- /base-questions/network/TCP-Connect-And-Close.md: -------------------------------------------------------------------------------- 1 | ## 简述 TCP 三次握手以及四次挥手的流程。为什么需要三次握手以及四次挥手？ 2 | 3 | ### 三次握手 4 | 5 | > 关键点: 双方交换 Seq、MSS 以及 Win 等信息，Server 使用两个队列存储半连接和全连接 6 | 7 | 1. 客户端向服务端发送带有 SYN 标志位以及一个随机的 Seq 序列号（X）的 TCP 数据包，并将自己的 MSS大小、接收窗口大小（Win）一并放入数据包内，请求建立连接（SYN 的含义其实就是 Synchronize，表示同步）。当发送完 SYN 包以后，客户端的 socket 状态由 `CLOSED` 转变为 `SYN_SENT`。 8 | 2. 服务端在收到客户端发来的 SYN 包以后，生成带有 SYN + ACK 标志的数据包，设置 Ack 确认号为 Seq + 1，并生成一个随机的 Seq 序列号（Y），与服务端 MSS大小、接收窗口大小（Win）一起添加至该数据包内，回送至客户端。当发送完 SYN + ACK 标志的 TCP 数据包以后，服务端 scoket 状态由 `LISTEEN` 转换为 `SYN_RECV`。 9 | 3. 客户端收到服务端发送的 SYN + ACK 数据包以后，需要回复确认包。即发送一个带有 ACK 标志位的数据包，此时 Seq 序列号为 X + 1，Ack 确认号为 Y + 1，客户端 socket 状态由 `SYN_SENT` 更新为 `ESTABLISHED`，对于客户端而言，TCP 连接已建立。当服务端收该确认包以后，socket 状态由 `SYN_RECV` 更新为 `ESTABLISHED`，表示连接已建立。 10 | 11 | ![Alt text](../images/1619766123992.png) 12 | 13 | 14 | 对于服务端而言，状态为 `SYN_RECV` 的 TCP 连接通常称为“半连接”，保存在监听队列中的未完成连接队列中。当收到了客户端的 ACK 确认包以后，状态更新至 `ESTABLISHED`，将连接从未完成连接队列中移动至已完成连接队列。`accept()` 函数中的 `backlog` 参数即为已完成连接队列的最大长度。 15 | 16 | 17 | 三次握手的意义: 18 | 19 | 1. 客户端与服务端确认双方可达，并且能够使用 TCP 协议传输消息。 20 | 2. 交换双方的 MSS、Win 大小，为 TCP 拥塞控制提供基础数据，尽最大可能地确保数据包不会丢失。 21 | 22 | ### 四次挥手 23 | 24 | > 关键点: 双方都要有关闭连接的意向，就跟分手似的。一个人说分手，另一个人得问清楚为什么，还得花时间消化这个消息，然后才能说分手。TIME_WAIT 和 CLOSE_WAIT 两个状态比较关键 25 | 26 | 1. 客户端（通常）准备关闭 TCP 连接，向服务端发送带有 FIN 标志位的数据包，状态由 `ESTABLISHED` 更新至 `FIN_WAIT1`。 27 | 2. 服务端收到 FIN 包以后，回复 Ack 确认包，状态由 `EATALISHED` 更新为 `CLOSE_WAIT`，应用程序此时仍然可以发送数据给客户端，并进行清理工作。客户端在收到 ACK 确认包以后，状态由 `FIN_WAIT1` 更新为 `FIN_WAIT2`。 28 | 3. 内核等待应用程序调用 `close(fd)` 关闭套接字，当应用程序关闭套接字以后，内核发送带有 FIN 标志位的数据包给客户端，表示服务端关闭连接。状态由 `CLOSE_WAIT` 更新至 `LAST_ACK`，表示等待客户端的最后一个 ACK 确认包。 29 | 4. 客户端收到 FIN 包以后，回送 ACK 确认包，状态由 `FIN_WAIT2`更新至 `TIME_WAIT`，等待 2MSL 后完全关闭该 socket。服务端收到 ACK 确认包以后，完全关闭 socket。 30 | 31 | 32 | ![Alt text](../images/1619767874908.png) 33 | 34 | 35 | 四次挥手的意义: 36 | 37 | 1. 确保 TCP 连接完全拆除，客户端与服务端各发送一次连接关闭请求与连接关闭确认包。 38 | 2. 当服务端收到 FIN 包时，可能仍有数据未发送完毕，需要继续发送，所以此时只能回送一个 ACK 确认包。等到所有数据均发送完毕，服务端没有其它动作需要执行了，主动调 `close(fd)` 方法关闭 socket，服务端发送 FIN 包。也就是说，第二次挥手和第三次挥手不能合并。 -------------------------------------------------------------------------------- /base-questions/network/TCP-Reliability.md: -------------------------------------------------------------------------------- 1 | ## TCP 怎么保证可靠传输？ 2 | 3 | 首先我们来看 TCP 数据包的结构: 4 | 5 | ![Alt text](../images/1620475785744.png) 6 | 7 | 其中序列号（Seq），确认号（Ack），ACK 标志以及接收窗口都是用来实现 TCP 可靠传输的组成之一。 8 | 9 | 1. **序列号保证数据传输的有序性**。TCP 协议会为每一个发出的数据包进行编号，这个编号就是序列号 Seq，Seq 的增长规则为 `Seq = Seq + 数据字节长度`。当网络出现抖动或者延迟导致 TCP 数据包乱序到达服务端时，服务端会根据 Seq 的大小进行排序，保证数据的连续性。 10 | 2. **确认号 Ack + 标志位 ACK 保证对方已收到 Ack 之前的所有数据包**。当接收方收到了 Seq 为 X 的数据包，并且 X 之前的所有数据包均已收到后，接收方将回送 ACK 确认号，以告知对方数据已收到。如果某些数据包丢失，TCP 会根据 Seq 号感知到，此时也会通过 Ack 确认号让对方重新发送该数据包。 11 | 3. **超时重传和快速重传保证数据包的重发**。当出现数据包丢失时，接收方可根据实际情况触发超时重传或者时快速重传，以确保数据包的连续性与准确性。超时重传是指当发送方迟迟没有收到接收方的 Ack 包时，达到超时时间后重传该序列号的数据包。快速重传则是指当发送方发送超过 3 个数据包，并且其中一个数据包丢失时，接收方就会因为数据包的缺失而向发送方发送该缺失数据包的 Ack。达到 3 个同样的 Ack 数据包以后，发送方就会意识到有数据包丢失，并重传此包。 12 | 4. **拥塞控制算法保证稳定的数据传输**。拥塞控制主要是通过接收缓冲区与接收窗口，发送缓冲区与发送窗口，以及快速重传和超时重传所实现的。在 TCP 三次握手时，双方交换了 MSS 和 Win 大小，发送数据方将选择这两个值中的较小值作为最大数据传输单元，保证数据包不会被网络直接丢弃。拥塞控制过程分为慢启动和拥塞避免阶段，发送窗口在慢启动阶段较快速增长，在拥塞避免阶段慢速增长。 13 | 14 | 可参考: 15 | 16 | > [可靠传输协议—TCP](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/%E5%8F%AF%E9%9D%A0%E4%BC%A0%E8%BE%93%E5%8D%8F%E8%AE%AE%E2%80%94TCP.pdf) 17 | 18 | > [TCP拥塞控制](https://smartkeyerror.oss-cn-shenzhen.aliyuncs.com/Phyduck/linux-network/TCP%E6%8B%A5%E5%A1%9E%E6%8E%A7%E5%88%B6.pdf) -------------------------------------------------------------------------------- /database/InnoDB Group Commit.pdf: -------------------------------------------------------------------------------- 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int(1024)}; 32 | 33 | smart_ptr gtr = ptr; 34 | 35 | cout << "ptr's ref count: " << ptr.use_count() << ", "; 36 | cout << "gtr's ref count: " << gtr.use_count() << endl; 37 | 38 | smart_ptr etr; 39 | cout << "etr's ref count: " << etr.use_count() << endl; 40 | 41 | etr = gtr; 42 | 43 | cout << "ptr's ref count: " << ptr.use_count() << ", "; 44 | cout << "etr's ref count: " << etr.use_count() << endl; 45 | 46 | /* ----------------------------------------------------- */ 47 | 48 | /* 49 | * 若只是单纯的使用类型参数 T 的话，下方的代码将无法执行 50 | * 因为无法将 smart_ptr 转换成 smart_ptr。因此，我们需要一个额外的模板参数来帮我们做这件事情 51 | * 52 | * template 53 | * smart_ptr(const smart_ptr& other); 54 | * 55 | * 但是，类模板的不同实例之间是不能直接访问其私有成员的，所以我们得把它变成友元 56 | * 57 | * template 58 | * friend class smart_ptr 59 | */ 60 | smart_ptr derived {new Dirived()}; 61 | smart_ptr another = derived; 62 | another->foo(); // Dirived foo, 多态性保留了下来 63 | 64 | } -------------------------------------------------------------------------------- /deliberate/01. smart_ptr/smart_ptr.hpp: -------------------------------------------------------------------------------- 1 | #ifndef __SMART_PTR_H_ 2 | #define __SMART_PTR_H_ 3 | 4 | #include 5 | #include 6 | 7 | 8 | class ref_count { 9 | private: 10 | // m_count 的自增和自减需要线程安全，故使用 atomic 11 | std::atomic m_count; 12 | public: 13 | ref_count() : m_count(1) {} 14 | 15 | void increase_count() {m_count++;} 16 | 17 | long long decrease_count() {return --m_count;} 18 | 19 | long long get_count() const {return m_count;} 20 | }; 21 | 22 | 23 | 24 | template 25 | class smart_ptr { 26 | private: 27 | T *_ptr; 28 | ref_count *_ref_count; 29 | public: 30 | 31 | template 32 | friend class smart_ptr; 33 | 34 | // 必须显式初始化，不允许进行隐式地类型转换 35 | explicit smart_ptr(T *ptr = nullptr) : _ptr(ptr) { 36 | if (ptr) { 37 | _ref_count = new ref_count(); 38 | } 39 | } 40 | 41 | ~smart_ptr() { 42 | if (_ptr && _ref_count->decrease_count() == 0) { 43 | delete _ptr; 44 | delete _ref_count; 45 | } 46 | } 47 | 48 | // 拷贝构造函数 49 | smart_ptr(const smart_ptr& other) { 50 | _ptr = other._ptr; 51 | if (_ptr) { 52 | other._ref_count->increase_count(); 53 | _ref_count = other._ref_count; 54 | } 55 | } 56 | 57 | /* 58 | * 用于子类指针向基类指针转换的情况 59 | */ 60 | template 61 | smart_ptr(const smart_ptr& other) { 62 | _ptr = other._ptr; 63 | if (_ptr) { 64 | other._ref_count->increase_count(); 65 | _ref_count = other._ref_count; 66 | } 67 | } 68 | 69 | // 移动构造函数 70 | template 71 | smart_ptr(smart_ptr&& other) noexcept { 72 | _ptr = other._ptr; 73 | if (_ptr) { 74 | _ref_count = other._ref_count; 75 | other._ptr = nullptr; 76 | } 77 | } 78 | 79 | // 拷贝赋值函数 80 | smart_ptr &operator= (const smart_ptr& rhs) { 81 | smart_ptr temp = smart_ptr{rhs}; 82 | swap(temp); 83 | return *this; 84 | } 85 | 86 | 87 | T *get_ptr() const {return _ptr;} 88 | 89 | long long use_count() const { 90 | return _ptr ? _ref_count->get_count() : 0; 91 | } 92 | 93 | T *operator->() const {return _ptr;} 94 | T &operator*() const {return *_ptr;} 95 | operator bool() const {return _ptr;} 96 | 97 | void swap(smart_ptr& other) { 98 | using std::swap; 99 | swap(_ptr, other._ptr); 100 | swap(_ref_count, other._ref_count); 101 | } 102 | 103 | }; 104 | 105 | #endif -------------------------------------------------------------------------------- /deliberate/02. blocking_queue/blocking_queue.hpp: -------------------------------------------------------------------------------- 1 | 2 | // 玩具级别的阻塞队列，condition_variable 的一个简单用例 3 | 4 | #ifndef __BLOCKING_QUEUE_H_ 5 | #define __BLOCKING_QUEUE_H_ 6 | 7 | #include 8 | #include 9 | #include 10 | 11 | template 12 | class blocking_queue { 13 | private: 14 | size_t m_capacity; 15 | std::queue m_queue; 16 | 17 | std::mutex m_mutex; 18 | std::condition_variable m_not_empty; 19 | std::condition_variable m_not_full; 20 | public: 21 | explicit blocking_queue(int capacity = 2) : m_capacity(capacity) {} 22 | 23 | void push(const T& item) { 24 | std::unique_lock lock_guard{m_mutex}; 25 | 26 | m_not_full.wait(lock_guard, [this] { 27 | return this->m_queue.size() != this->m_capacity; 28 | }); 29 | 30 | m_queue.push(item); 31 | 32 | m_not_empty.notify_one(); 33 | } 34 | 35 | T &pop() { 36 | std::unique_lock lock_guard{m_mutex}; 37 | 38 | m_not_empty.wait(lock_guard, [this] { 39 | return this->m_queue.size() != 0; 40 | }); 41 | 42 | T &item = m_queue.front(); 43 | m_queue.pop(); 44 | 45 | m_not_full.notify_one(); 46 | 47 | return item; 48 | } 49 | }; 50 | 51 | #endif -------------------------------------------------------------------------------- /deliberate/02. blocking_queue/main.cpp: -------------------------------------------------------------------------------- 1 | #include "blocking_queue.hpp" 2 | 3 | #include 4 | #include 5 | 6 | using namespace std; 7 | 8 | 9 | void producer(blocking_queue& queue) { 10 | for (int i = 0; i < 10; i++) { 11 | queue.push(i); 12 | cout << "生产数据完毕: " << i << endl; 13 | } 14 | } 15 | 16 | void consumer(blocking_queue& queue) { 17 | for (int i = 0; i < 10; i++) { 18 | int res = queue.pop(); 19 | cout << "开始消费数据: " << res << endl; 20 | std::this_thread::sleep_for(1s); 21 | } 22 | } 23 | 24 | int main() { 25 | blocking_queue queue; 26 | 27 | thread t1 {producer, std::ref(queue)}; 28 | thread t2 {consumer, std::ref(queue)}; 29 | 30 | t1.join(); 31 | t2.join(); 32 | 33 | cout << "Task Done" << endl; 34 | } 35 | -------------------------------------------------------------------------------- /deliberate/03. signal_process/main.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | 7 | void signal_handler(int sig) { 8 | // errno 虽然是线程安全的，但是内核在调用信号处理函数时，并不会帮我们恢复 errno 的值 9 | // 因此我们需要用一个临时变量来保存进入信号处理函数时的 errno，处理结束后再进行恢复 10 | int prev = errno; 11 | 12 | sigset_t current; 13 | sigprocmask(SIG_BLOCK, NULL, ¤t); // 获取当前进程信号掩码 14 | 15 | // 当我们因为收到某一个信号而进入信号处理函数时，该信号会被默认的添加至当前进程信号掩码中， 16 | // 防止出现递归打断信号处理函数执行的情况 17 | if (sigismember(¤t, sig)) { 18 | 19 | // printf() 为不可重入函数，但是 read/write 以及 recv/send 等方法为可重入函数 20 | // printf, fread、fwrite 等带有用户 I/O 缓冲区的标准库函数为不可重入函数，应避免使用 21 | 22 | char msg[] = "SIGINT 已被添加至进程信号掩码集中\n"; 23 | write(STDOUT_FILENO, msg, sizeof(msg)); 24 | } 25 | 26 | errno = prev; 27 | } 28 | 29 | int main() { 30 | sigset_t set; 31 | sigemptyset(&set); 32 | 33 | struct sigaction action = { 34 | signal_handler, 35 | set, 36 | SA_RESTART 37 | }; 38 | 39 | if (sigaction(SIGINT, &action, NULL) == -1) { // 为 SIGINT 注册信号处理函数 40 | perror("SIGINT 信号处理函数注册失败"); 41 | return 1; 42 | } 43 | 44 | while (1) { 45 | printf("main function \n"); 46 | int remain = sleep(5); 47 | 48 | if (remain) { // sleep 可以被打断，并且不会重新睡眠，而是返回剩余的睡眠时间 49 | printf("sleep 被打断，还剩 %d 秒睡眠时间 \n", remain); 50 | break; 51 | } 52 | } 53 | return 0; 54 | } 55 | -------------------------------------------------------------------------------- /go-concurrency/channel/alternately_print_test.go: -------------------------------------------------------------------------------- 1 | package channel 2 | 3 | import ( 4 | "fmt" 5 | "testing" 6 | "time" 7 | ) 8 | 9 | // 有四个 goroutine，编号为 1、2、3、4。 10 | // 每秒钟会有一个 goroutine 打印出它自己的编号，要求你编写一个程序， 11 | // 让输出的编号总是按照 1、2、3、4、1、2、3、4、……的顺序打印出来。 12 | 13 | func AlternatelyPrint() { 14 | ch1 := make(chan bool) 15 | ch2 := make(chan bool) 16 | ch3 := make(chan bool) 17 | ch4 := make(chan bool) 18 | 19 | go func() { 20 | for { 21 | fmt.Println("Goroutine 1") 22 | time.Sleep(time.Second) 23 | ch2 <- true 24 | <-ch1 25 | } 26 | }() 27 | 28 | go func() { 29 | for { 30 | <-ch2 31 | fmt.Println("Goroutine 2") 32 | time.Sleep(time.Second) 33 | ch3 <- true 34 | } 35 | }() 36 | 37 | go func() { 38 | for { 39 | <-ch3 40 | fmt.Println("Goroutine 3") 41 | time.Sleep(time.Second) 42 | ch4 <- true 43 | } 44 | }() 45 | 46 | go func() { 47 | for { 48 | <-ch4 49 | fmt.Println("Goroutine 4") 50 | time.Sleep(time.Second) 51 | ch1 <- true 52 | } 53 | }() 54 | 55 | select {} 56 | } 57 | 58 | // 另一种实现方式 59 | func AlternatelyPrint2() { 60 | ch := make(chan struct{}) 61 | 62 | for i := 1; i < 5; i++ { 63 | go func(index int) { 64 | time.Sleep(time.Duration(index) * time.Millisecond) 65 | for { 66 | <-ch 67 | fmt.Printf("Goroutine %d \n", index) 68 | time.Sleep(time.Second) 69 | ch <- struct{}{} 70 | } 71 | }(i) 72 | } 73 | 74 | ch <- struct{}{} 75 | select {} 76 | } 77 | 78 | type Token struct{} 79 | 80 | // 第三种方式，其实就是把第一种方式抽象了出来 81 | func AlternatelyPrint3(total int) { 82 | 83 | // 初始化一堆 channel，用于多个 Goroutine 间通信 84 | channels := make([]chan Token, total) 85 | for i := 0; i < total; i++ { 86 | channels[i] = make(chan Token) 87 | } 88 | 89 | for i := 0; i < total; i++ { 90 | go func(index int, current chan Token, nextChan chan Token) { 91 | for { 92 | <-current 93 | fmt.Printf("Goroutine %d \n", index) 94 | time.Sleep(time.Second) 95 | nextChan <- Token{} 96 | } 97 | }(i+1, channels[i], channels[(i+1)%total]) 98 | } 99 | channels[0] <- Token{} 100 | select {} 101 | } 102 | 103 | func TestAlternatelyPrint(t *testing.T) { 104 | //AlternatelyPrint() 105 | //AlternatelyPrint2() 106 | AlternatelyPrint3(4) 107 | } 108 | -------------------------------------------------------------------------------- /go-concurrency/channel/goroutine_leak_test.go: -------------------------------------------------------------------------------- 1 | package channel 2 | 3 | import ( 4 | "fmt" 5 | "testing" 6 | "time" 7 | ) 8 | 9 | // 这段代码的问题就在于，使用了一个 unbuffered channel， 10 | // unbuffered channel 只有在 receiver 和 sender 都准备好的时候才不会发生阻塞。 11 | // 当任务执行时间超过 2s 时，定时器到期后直接退出 select {} 多路复用， 12 | // 我们就再也不可能接收到 ch 中的数据了。也就是说，执行耗时任务的那个 goroutine 永远都不会退出 13 | func TestGoroutineLeak(t *testing.T) { 14 | ch := make(chan struct{}) 15 | 16 | go func() { 17 | // 模拟耗时任务 18 | time.Sleep(5 * time.Second) 19 | // 任务执行完毕后向外发出通知 20 | ch <- struct{}{} 21 | }() 22 | 23 | select { 24 | case <-ch: 25 | fmt.Println("Task Done") 26 | case <-time.After(2 * time.Second): 27 | fmt.Println("Time Limit Exceeded") 28 | } 29 | } 30 | 31 | // 这里有一个关于 GC 的问题，假如下面儿的 ch 中装的堆变量，那么当函数运行结束后，ch 会被 GC 回收掉吗? 32 | // channel 源码: https://github.com/golang/go/blob/2ebe77a2fda1ee9ff6fd9a3e08933ad1ebaea039/src/runtime/chan.go#L355 33 | // 一个比较有意思的地方在于，channel 的 close 方法并没有去清理环形队列 buf 中的内容，仅仅只是清理了两个阻塞队列中的内容， 34 | // 这和 channel 的行为是一致的: 当我们关闭了一个 channel 以后，receiver 仍然可以继续读取 channel 中的内容，直到没有任何数据 35 | // 如果 buf 中有内容的 ch 可以被回收，那么是什么时候被 GC 的呢? GC 又是通过什么条件去判断 channel 可以被回收的呢? 36 | func TestTimeOutFunction(t *testing.T) { 37 | ch := make(chan struct{}, 1) 38 | 39 | go func() { 40 | // 模拟耗时任务 41 | time.Sleep(5 * time.Second) 42 | // 任务执行完毕后向外发出通知 43 | ch <- struct{}{} 44 | }() 45 | 46 | select { 47 | case <-ch: 48 | fmt.Println("Task Done") 49 | case <-time.After(2 * time.Second): 50 | fmt.Println("Time Limit Exceeded") 51 | } 52 | } 53 | -------------------------------------------------------------------------------- /go-concurrency/go.mod: -------------------------------------------------------------------------------- 1 | module Psyduck/go-concurrency 2 | 3 | go 1.15 4 | -------------------------------------------------------------------------------- /go-concurrency/memory/memory_reordering_test.go: -------------------------------------------------------------------------------- 1 | package memory 2 | 3 | import ( 4 | "fmt" 5 | "testing" 6 | ) 7 | 8 | type Message struct { 9 | Msg string 10 | } 11 | 12 | var msg *Message 13 | var Done bool 14 | 15 | // 指令重排是指写在程序中的两条语句在 CPU 执行时可能会出现，执行顺序与编写顺序不一致的情况。 16 | // 也就是说，可能会出现 Done 被赋值成为 true 之后，才会去执行 msg = new(Message) 这两条指令 17 | // 那么在 TestMemoryReordering 执行时，很有可能出现跳出了无限循环，但是 msg 仍然为 nil 的情况 18 | 19 | // 不过，这件事情不会在单个的 Goroutine 中发生，因为 Go 保证了 在一个 goroutine 内部， 20 | // 程序的执行顺序和它们的代码指定的顺序是一样的，即使编译器或者 CPU 重排了读写顺序，从行为上来看，也和代码指定的顺序一样。 21 | func MayBeReordering() { 22 | msg = new(Message) 23 | msg.Msg = "Hello Memory Reordering" 24 | Done = true 25 | } 26 | 27 | func TestMemoryReordering(t *testing.T) { 28 | MayBeReordering() 29 | 30 | for Done == false { 31 | } 32 | 33 | fmt.Println(msg.Msg) 34 | } 35 | -------------------------------------------------------------------------------- /go-concurrency/mutex/mutex_test.go: -------------------------------------------------------------------------------- 1 | package mutex 2 | 3 | import ( 4 | "fmt" 5 | "sync" 6 | "testing" 7 | ) 8 | 9 | func foo(number int, mutex sync.Locker) { 10 | if number == 1 { 11 | return 12 | } 13 | mutex.Lock() 14 | 15 | foo(number-1, mutex) 16 | 17 | mutex.Unlock() 18 | } 19 | 20 | // fatal error: all goroutines are asleep - deadlock! 21 | // 发生了死锁，也就是说，Mutex 是不可重入的。 22 | // 因为 Mutex 在设计的时候，就没有把具体的 Goroutine 写入至 Mutex 的状态中， 23 | // 因此所有的 Goroutine 的地位都是一样的，尽管当前 Goroutine 已经获得了锁， 24 | func TestReentrantMutex(t *testing.T) { 25 | var mutex sync.Mutex 26 | foo(10, &mutex) 27 | } 28 | 29 | // 我们也可以使用 Mutex 来实现单例模式，比如配置文件的生成 30 | 31 | type Config struct { 32 | Host string 33 | Port uint16 34 | Workers uint8 35 | } 36 | 37 | var config *Config 38 | 39 | // 传统的双重校验锁方式，不过这种写法在其它一些语言中，例如 C++ 中，会因为指令重排的原因导致 Crash 40 | // 所以其实现在很少有人会这么用，支持静态变量的语言都会利用“静态变量只会初始化一次”的特性来实现 41 | // 而 Go 中则提供了 sync.Once 来实现单例 42 | func GetConfig() *Config { 43 | var mutex sync.Mutex 44 | 45 | if config == nil { 46 | mutex.Lock() 47 | if config == nil { 48 | config = &Config{ 49 | Host: "127.0.0.1", 50 | Port: 8080, 51 | Workers: 4, 52 | } 53 | } 54 | mutex.Unlock() 55 | } 56 | return config 57 | } 58 | 59 | func TestSingletonConfig(t *testing.T) { 60 | var wg sync.WaitGroup 61 | wg.Add(10) 62 | 63 | for i := 0; i < 10; i++ { 64 | go func() { 65 | defer wg.Done() 66 | config := GetConfig() 67 | fmt.Printf("config address : %p \n", config) 68 | }() 69 | } 70 | 71 | wg.Wait() 72 | 73 | fmt.Printf("config address : %p", GetConfig()) 74 | } 75 | -------------------------------------------------------------------------------- /go-concurrency/mutex/once_test.go: -------------------------------------------------------------------------------- 1 | package mutex 2 | 3 | import ( 4 | "fmt" 5 | "sync" 6 | "testing" 7 | ) 8 | 9 | type OtherConfig struct { 10 | Host string 11 | Port uint16 12 | Workers uint8 13 | } 14 | 15 | var once sync.Once 16 | var otherConfig *OtherConfig 17 | 18 | func GetOtherConfig() *OtherConfig { 19 | 20 | // 使用 Once 的一个最常见的错误就是把 once 的声明放在了函数里面儿 21 | // 如果用下面儿的代码运行的话，就会发现每一次 config 的地址都不同 22 | // var once sync.Once 23 | 24 | once.Do(func() { 25 | otherConfig = &OtherConfig{ 26 | Host: "127.0.0.1", 27 | Port: 9090, 28 | Workers: 4, 29 | } 30 | }) 31 | 32 | return otherConfig 33 | } 34 | 35 | func TestOnceSingleton(t *testing.T) { 36 | var wg sync.WaitGroup 37 | wg.Add(10) 38 | 39 | for i := 0; i < 10; i++ { 40 | go func() { 41 | defer wg.Done() 42 | config := GetOtherConfig() 43 | fmt.Printf("other config address : %p \n", config) 44 | }() 45 | } 46 | 47 | wg.Wait() 48 | 49 | fmt.Printf("other config address : %p", GetOtherConfig()) 50 | } 51 | -------------------------------------------------------------------------------- /go-concurrency/mutex/race_test.go: -------------------------------------------------------------------------------- 1 | package mutex 2 | 3 | import ( 4 | "fmt" 5 | "sync" 6 | "testing" 7 | "time" 8 | ) 9 | 10 | // 一个经典的 Race Condition 的入门例子，count 的结果取决于程序运行时的环境，也就是 11 | // 多次运行，得到的 count 都会不一样 12 | // 使用 go test -race race_test.go 可发现出该测试文件中存在的竞态问题 13 | func TestRaceCondition(t *testing.T) { 14 | 15 | var count uint32 16 | 17 | var mutex sync.Mutex 18 | var wg sync.WaitGroup 19 | 20 | wg.Add(10) 21 | 22 | for i := 0; i < 10; i++ { 23 | go func() { 24 | defer wg.Done() 25 | for j := 0; j < 10000; j++ { 26 | // 简单解决 Race Condition 的方法，对于这种简单累加的东西， 27 | // 使用 Mutex 还是会有一些性能损耗的，使用原子变量会更好一些 28 | // atomic.AddUint32(&count, 1) 29 | mutex.Lock() 30 | count++ 31 | mutex.Unlock() 32 | } 33 | }() 34 | } 35 | 36 | wg.Wait() 37 | fmt.Println(count) 38 | } 39 | 40 | // Goroutine g1 通过 Lock() 方法获取了锁，在 g1 持有期间，另一个 Goroutine g2 调用 41 | // Unlock() 想要释放这个锁，那么这个调用是否会成功? g1 还能不能正常运行? 42 | // g2 能够成功调用 Unlock，但是后续 g1 调用 Unlock 时将会 panic。这操作真的挺骚的：走你的路，让你无路可走 43 | func TestUnlockOtherCorLock(t *testing.T) { 44 | var mutex sync.Mutex 45 | 46 | // 假设该 Goroutine 叫 A，主流程的 Goroutine 叫 B 47 | go func() { 48 | mutex.Lock() 49 | time.Sleep(5 * time.Second) 50 | mutex.Unlock() 51 | }() 52 | 53 | // A 此时可以 unlock mutex 吗? 54 | time.Sleep(time.Second) 55 | mutex.Unlock() 56 | 57 | select {} 58 | } 59 | -------------------------------------------------------------------------------- /go-concurrency/mutex/rwmutex_test.go: -------------------------------------------------------------------------------- 1 | package mutex 2 | 3 | import ( 4 | "fmt" 5 | "sync" 6 | "testing" 7 | "time" 8 | ) 9 | 10 | func TestRWMutex(t *testing.T) { 11 | pool := make(map[string]string) 12 | 13 | var wg sync.WaitGroup 14 | wg.Add(10) 15 | 16 | var mutex sync.RWMutex 17 | for i := 0; i < 10; i++ { 18 | go func() { 19 | // 读操作 20 | for j := 0; j < 5; j++ { 21 | mutex.RLock() 22 | fmt.Println(pool["name"]) 23 | mutex.RUnlock() 24 | time.Sleep(time.Millisecond * 500) 25 | } 26 | }() 27 | } 28 | 29 | for i := 0; i < 10; i++ { 30 | mutex.Lock() 31 | pool["name"] = "Buz~~" 32 | mutex.Unlock() 33 | time.Sleep(time.Second * 1) 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /golang/G-M-P模型.pdf: 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-------------------------------------------------------------------------------- /materials/MySQL-Join.drawio: -------------------------------------------------------------------------------- 1 | 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-------------------------------------------------------------------------------- /materials/README.md: -------------------------------------------------------------------------------- 1 | 2 | ### Materials 3 | 4 | 大家似乎对如何使用 [draw.io](https://app.diagrams.net/) 这个网站作图更感兴趣一些，在 V 站也有很多老哥问我图片是用什么做的。 5 | 6 | 所以我把一部分我认为画的比较好的图片源文件放在这个目录下，文件后缀名为 `.drawio`，本地无法直接打开，需要在上述网页中执行 `File->Open from->Device`。 7 | 8 | 希望能对大家有所帮助 :) -------------------------------------------------------------------------------- /materials/docker.drawio: -------------------------------------------------------------------------------- 1 | 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-------------------------------------------------------------------------------- /materials/golang-map-and-channel.drawio: -------------------------------------------------------------------------------- 1 | ddHBDoIwDADQr9kdNgN6RpSLJw6eF1bZkkHJmAH9eiEDsVFP217bremYyJrx7GSnL6jAMh6pkYkj4zze8WRaZnkESdM4QO2MChRtUJonLJWr3o2CfrFAHtF601GssG2h8sSkczjQtBtaRaCTNZA2ZigraeEr7WqU10H3PN28AFPr9eU4OYRII9fk5eJeS4XDB4mcicwh+rBrxgzsPDw6l9Of6LsxB63/UTBttrunA/khkb8A -------------------------------------------------------------------------------- /materials/k8s.drawio: -------------------------------------------------------------------------------- 1 | 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