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- Herausgeber: Packt Publishing
- Kategorie: Fachliteratur
- Sprache: Englisch
In an age when computer processors are being developed to contain more and more cores, multithreading is a key factor for creating scalable, effective, and responsive applications. If you fail to do it correctly, it can lead to puzzling problems that take a huge amount of time to resolve. Therefore, having a solid understanding of multithreading is a must for the modern application developer. Multithreading in C# 5.0 Cookbook is an easy-to-understand guide to the most puzzling programming problems. This book will guide you through practical examples dedicated to various aspects of multithreading in C# on Windows and will give you a good basis of practical knowledge which you can then use to program your own scalable and reliable multithreaded applications. This book guides you through asynchronous and parallel programming from basic examples to practical, real-world solutions to complex problems. You will start from the very beginning, learning what a thread is, and then proceed to learn new concepts based on the information you get from the previous examples.
After describing the basics of threading, you will be able to grasp more advanced concepts like Task Parallel Library and C# asynchronous functions. Then, we move towards parallel programming, starting with basic data structures and gradually progressing to the more advanced patterns. The book concludes with a discussion of the specifics of Windows 8 application programming, giving you a complete understanding of how Windows 8 applications are different and how to program asynchronous applications for Windows 8.
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Seitenzahl: 266
Veröffentlichungsjahr: 2013
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Table of Contents
Multithreading in C# 5.0 Cookbook
Multithreading in C# 5.0 Cookbook
Copyright © 2013 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: November 2013
Production Reference: 1191113
Published by Packt Publishing Ltd.
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ISBN 978-1-84969-764-4
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Cover Image by Aniket Sawant (<[email protected]>)
Credits
Author
Eugene Agafonov
Reviewers
Mickael Ferrer
Chad McCallum
Philip Pierce
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Cover Work
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About the Author
Eugene Agafonov leads a web development department at ABBYY, and lives and works in Moscow. He has over 15 years of professional experience in software development and started to work with C# from the time it was in its beta version. He is a Microsoft MVP in ASP.NET since 2006, and he often speaks at local software development conferences, such as TechEd Russia, about cutting-edge technologies in the Modern Web and server-side application development. His main professional interests are cloud-based software architecture, scalability, and reliability. Eugene is a huge fan of football and plays the guitar with a local rock band. You can reach him at his personal blog eugeneagafonov.com or with his twitter handle @eugene_agafonov.
About the Reviewers
Mickael Ferrer is a geek who has played with a lot of technologies through the years; He is the jack of all trades, but master of none.He specialized in .Net and C# development, in particular, for extending Excel.He spent much of his short professional career in the financial industry as a front-office developer.He recently started a self-employed training business for .Net developers.He randomly writes stuff on his technical blog at pragmateek.com
Chad McCallum is a Saskatchewan computer geek and an ASP.NET MVP with over seven years of .NET experience. After graduating from the Computer Systems Technology course at SIAST in Saskatoon, he picked up contracting until he could pester iQmetrix to give him a job, where he's been for the last seven years. He had a brief stint in Vancouver, working on interactive retail software. Since then, he's come back to Regina, SK, where he's started HackREGINA, a hackathon organization aimed at strengthening the developer community while coding and drinking beer. Somehow, between his real-life job and sleep, he managed to publish a Pluralsight course on 10 Ways to Build Web Services in .NET. His current focus is on single-page applications with JavaScript. Between random app ideas, he tries to learn a new technology every week; you can see the results on www.rtigger.com.
Philip Pierce is a software developer with twenty years of experience in mobile, web, desktop, and server development, database design and management, and game development. His background includes creating A.I. for games and business software, converting AAA games among various platforms, developing multithreaded applications, and creating patented client/server communication technologies.
Philip has won several hackathons, including Best Mobile App at the AT&T Developer Summit 2013, and a runner up for Best Windows 8 App at PayPal's Battlethon Miami. His most recent project was converting Rail Rush and Temple Run 2 from the Android platform to Arcade platforms.
Philip's portfolios can be found at http://www.rocketgamesmobile.com and http://www.philippiercedeveloper.com.
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To my dearly beloved wife Helen and son Nikita
Preface
Not so long ago, a typical personal computer CPU had only one computing core, and the power consumption was enough to cook fried eggs on it. In 2005, Intel introduced its first multiple-core CPU, and since then computers started developing in a different direction. Low power consumption and a number of computing cores became more important than a row computing core performance. This lead to programming paradigm changes as well. Now we need to learn how to use all CPU cores effectively to achieve the best performance, and at the same time, save battery power by running only the programs we need at a particular time. Besides that, we need to program server applications in a way to use multiple CPU cores or even multiple computers as efficiently as possible to support as many users as we can.
To be able to create such applications, you have to learn to use multiple CPU cores in your programs effectively. If you use the Microsoft .NET development platform and C# programming language, this book will be a perfect starting point for programming applications that have good performance and responsiveness.
The purpose of this book is to provide you with a step-by-step guide for multithreading and parallel programming in C#. We will start with the basic concepts, going through more and more advanced topic based on the information from previous chapters, and end with real-world parallel programming patterns and Windows Store application samples.
What this book covers
Chapter 1, Threading Basics, introduces basic operations with threads in C#. It explains what a thread is, the pros and cons of using threads, and other important thread aspects.
Chapter 2, Thread Synchronization, describes thread interaction details. You will learn why we need to coordinate threads together and the different ways of organizing thread coordination.
Chapter 3, Using a Thread Pool, explains a thread pool concept. It shows how to use a thread pool, how to work with asynchronous operations, and good and bad practices of using a thread pool.
Chapter 4, Using Task Parallel Library, is a deep dive into a Task Parallel Library framework. This chapter outlines every important aspect of TPL, including tasks combination, exceptions management, and operations cancellation.
Chapter 5, Using C# 5.0, explains in detail the new C# 5.0 feature – asynchronous methods. You will find out what async and await keywords mean, how to use them in different scenarios, and how await works under the hood.
Chapter 6, Using Concurrent Collections, describes standard data structures for parallel algorithms included in the .NET Framework. It goes through sample programming scenarios for each data structure.
Chapter 7, Using PLINQ, is a deep dive into the Parallel LINQ infrastructure. The chapter describes task and data parallelism, parallelizing a LINQ query, tweaking parallelism options, partitioning a query, and aggregating parallel query result.
Chapter 8, Reactive Extensions, explains how and when to use the Reactive Extensions framework. You will learn how to compose events and how to perform a LINQ query against an event sequence.
Chapter 9, Using Asynchronous I/O, covers in detail the asynchronous I/O process including files, networks, and database scenarios.
Chapter 10, Parallel Programming Patterns, outlines the common parallel programming problem solutions.
Chapter 11, There's More, covers the aspects of programming asynchronous applications for Windows 8. You will learn how to work with Windows 8 asynchronous APIs, and how to perform background work in Windows Store applications.
What you need for this book
For most of the recipes, you will need Microsoft Visual Studio Express 2012 for Windows Desktop. Recipes in Chapter 11 will require Windows 8 and Microsoft Visual Studio Express 2012 for Windows 8 to compile Windows Store applications.
Who this book is for
Multithreading in C# 5.0 Cookbook is written for existing C# developers with little or no background in multithreading, and asynchronous and parallel programming. The book covers these topics from basic concepts to complicated programming patterns and algorithms using C# and .NET ecosystem.
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Chapter 1. Threading Basics
In this chapter, we will cover the basic tasks for working with threads in C#. You will learn about:
Introduction
At some point of time in the past, the common computer had only one computing unit and could not execute several computing tasks simultaneously. However, operating systems could already work with multiple programs simultaneously, implementing the concept of multitasking. To prevent the possibility of one program taking control of the CPU, forever causing other applications and the operating system itself to hang, the operating systems had to split a physical computing unit across a few virtualized processors in some way and give a certain amount of computing power to each executing program. Moreover, an operating system must always have priority access to the CPU and should be able to prioritize CPU access to different programs. A thread is an implementation of this concept. It could be considered a virtual processor given to the one specific program that runs it independently.
Note
Remember that a thread consumes a significant amount of operating system resources. Trying to share one physical processor across many threads will lead to a situation where an operating system is busy just managing threads instead of running programs.
Therefore, while it was possible to enhance computer processors, making them execute more and more commands per second, working with threads was usually an operating system task. There was no sense in trying to compute some tasks in parallel on a single-core CPU because it would take more time than running those computations sequentially. However, when processors started to have more computing cores, older programs could not take advantage of this because they just used one processor core.
To use a modern processor's computing power effectively, it is very important to be able to compose a program in a way that it can use more than one computing core, which leads to organizing it as several threads communicating and synchronizing with each other.
The recipes in this chapter will focus on performing some very basic operations with threads in the C# language. We will cover a thread's lifecycle, which includes creating, suspending, making a thread wait, and aborting a thread, and then we will go through basic synchronization techniques.
