## +23 ## File I/O for Game Developers: Past, Present, and Future ## GUY DAVIDSON ## 20 23 October 01 - 06 # FILE I/O: PAST, PRESENT AND FUTURE CPPCON OCTOBER 3 $ ^{RD} $ 2023 GUY DAVIDSON @HATCAT01 @HATCAT01 ## I NTRODUCTIONS • Head of Engineering Practice at Creative Assembly • 1980 – Acorn Atom ISO/IEC JTCI/SC22/WG21 • BSI IST/5 • Avid conference speaker and organiser “Beautiful C++ presents the Why do we have files? • What is a filesystem? • Why should we avoid buffered file IO? • How do we optimise unbuffered file IO? • How might the standard help us in future? ## AGENDA Sub-megabyte days

Java 1/0 原理 常用 I/O 流类型 # Java 应用与开发 高级 I/O 编程 王晓东 wangxiaodong@ouc.edu.cn 中国海洋大学 October 29, 2018   Source） 数据宿（Data Sink） ▶ 流（Stream） Java 中把不同的数据源与程序间的数据传输都抽象表述为流，java.io 包中定义了多种 I/O 流类型实现数据 I/O 功能。 ## Java I/O 流的分类 ## ☑ 按照数据流动的方向 Java 流可分为输入流（Input Stream）和输出流（Output Stream）。 ▶ 输入流只能从中读取数据，而不能向其写出数据；

 # Firebird File and Metadata Security Geoff Worboys Version 0.6, 30 June 2020 ## Table of Contents 1. Introduction . connecting to the database require direct access to the database file itself. All access goes through the server process, which accesses the database file as needed to fulfil requests. It is the server that restricts However, it also means that, if I have direct access to a database file, I can copy that file from a server where I may not know the SYSDBA password onto a different server where I do know the SYSDBA password

structure Software system ## ■ Design pattern ■ Interplay of components ■ Focus on a subsystem ## I diome ■ Implementation of an architecture or design pattern in a concrete programming language. ## Interface ■ Guarded Suspension Reactor ## Scoped Locking ## Scoped Locking is RAI applied to locking ## I dea: - Bind the acquiring (constructor) and the releasing (destructor) of the resource to the lifetime locking strategies as replaceable components. Is the application of the strategy pattern to locking. ## I dea: ■ You want to use your library in various domains. - Depending on the domain, you want to use

## SQLite as a Result File Format in OMNeT++ Rudolf Hornig ## OMNeT++ Result Files ## • Scalar and Vector files • Contents: ☐ Run description ☐ Scalar file: (module, scalar, value), histograms, result result attributes ☐ Vector file: vector data: (module, vectorname, vector data = (timestamp + value)*) ## • Current format: ☐ Line-oriented text file, human-readable, easy to parse ☐ Tools: ☑ Analysis Format: SQLite • SQLite: embedded, low-resource database engine ☐ Database is a local file ☐ Engine is a single C file (easy to add into existing programs) ☐ Capable SQL support Robust and proven (used

## Why I Was Wrong About TypeScript TJ VanToll Progress $ ^{®} $ DevReach 2013 THE PREMIER DEVELOPER CONFERENCE IN CENTRAL & EASTERN EUROPE ## TypeScript TypeScript Modules Decorators Generics Triple-Slash Directives Structural detection ## Why I Was Wrong About TypeScript ## Whether TypeScript is a good fit for your next project ## Why I Was Wrong About TypeScript ## “A typed superset of JavaScript SITE OF THE WEEK To get started, download the "bootstrap.css" or "bootstrap.min.css" file and include it in your Typography Navbar Buttons Forms Tables NEW Miscellaneous ##

#### Nim Tutorial (Part I) 0.17.1 ## Andreas Rumpf August 19, 2017 Contents 1 Introduction 2 2 The first program 2 3 Lexical elements 2 3.1 String and character literals 3 3.2 Comments 3 "!" Save this code to the file "greetings.nim". Now compile and run it: nim compile --run greetings.nim With the -run switch Nim executes the file automatically after compilation. You turned off and optimizations are turned on. Though it should be pretty obvious what the program does, I will explain the syntax: statements which are not indented are executed when the program starts. Indentation

[Image](/uploads/documents/4/1/f/7/41f7ae8ceaa6f78310b437a4e201349e/p1_1.jpg) ## ANGULAR 2 MOCK TEST I ## Q 1 - Which of the following is correct about Angular 2 Components? A - AngularJS had a focus of

## The Julia Language ## julia V1.8.0 The Julia Project August 19, 2022 ## Contents Contents I Manual 1 Julia 1.8 Documentation 2 Getting Started 2.1 Resources 3 Variables 3.1 Allowed Variable Operations on Arrays ..... 269 21 Networking and Streams ..... 271 21.1 Basic Stream I/O ..... 271 21.2 Text I/O ..... 272 21.3 IO Output Contextual Properties ..... 273 21.4 Working with Files 21.5 A simple TCP example ..... 274 21.6 Resolving IP Addresses ..... 276 21.7 Asynchronous I/O ..... 276 21.8 Multicast ..... 277 22 Parallel Computing ..... 279 23 Asynchronous Programming

具体flag的实现方案 • O TRUNC • I/O模式类 • O DIRECT • O SYNC, O DSYNC • O NONBLOCK(O NDELAY), FASYNC, O TMPFILE 结论 参考文献 ## open接口原型 # man page open, openat, creat - open and possibly create a file #include const char *pathname, const struct open_how *how, size_t size); open系统调用会打开pathname指定的文件（如果不存在，如果携带O_CREAT flag则会创建），返回一个文件描述符fd（该fd是进程打开文件描述符表的index），在后续系统调用（read(2)、write(2)、lseek(2)、fcntl(2) etc.) #define O_RONONLY 00000000 #define O_WRONLY 00000001 #define O_RDWR 00000002 #define O_CREAT 00000100 #define O_EXCL 00000200 #define O_NOCTTY 00000400 #define O_TRUNC 00001000 #define O_APPEND 00002000