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Multithreading in C# 5.0 Cookbook

Multithreading in C# 5.0 Cookbook

By : Agafonov
4.6 (5)
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Multithreading in C# 5.0 Cookbook

Multithreading in C# 5.0 Cookbook

4.6 (5)
By: Agafonov
Buy this Book

Overview of this book

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.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Threading Basics
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1. Threading Basics
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Introduction
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Creating a thread in C#
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Pausing a thread
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Making a thread wait
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Aborting a thread
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Determining a thread state
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Thread priority
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Foreground and background threads
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Passing parameters to a thread
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Locking with a C# lock keyword
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Locking with a Monitor construct
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Handling exceptions
2
2. Thread Synchronization
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2. Thread Synchronization
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Introduction
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Performing basic atomic operations
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Using the Mutex construct
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Using the SemaphoreSlim construct
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Using the AutoResetEvent construct
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Using the ManualResetEventSlim construct
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Using the CountDownEvent construct
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Using the Barrier construct
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Using the ReaderWriterLockSlim construct
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Using the SpinWait construct
3
3. Using a Thread Pool
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3. Using a Thread Pool
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Introduction
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Invoking a delegate on a thread pool
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Posting an asynchronous operation on a thread pool
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Thread pool and the degree of parallelism
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Implementing a cancellation option
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Using a wait handle and timeout with a thread pool
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Using a timer
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Using the BackgroundWorker component
4
4. Using Task Parallel Library
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4. Using Task Parallel Library
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Introduction
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Creating a task
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Performing basic operations with a task
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Combining tasks together
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Converting the APM pattern to tasks
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Converting the EAP pattern to tasks
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Implementing a cancellation option
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Handling exceptions in tasks
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Running tasks in parallel
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Tweaking tasks execution with TaskScheduler
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5. Using C# 5.0
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5. Using C# 5.0
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Introduction
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Using the await operator to get asynchronous task results
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Using the await operator in a lambda expression
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Using the await operator with consequent asynchronous tasks
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Using the await operator for the execution of parallel asynchronous tasks execution
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Handling exceptions in the asynchronous operations
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Avoid using the captured synchronization context
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Working around the async void method
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Designing a custom awaitable type
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Using the dynamic type with await
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6. Using Concurrent Collections
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6. Using Concurrent Collections
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Introduction
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Using ConcurrentDictionary
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Implementing asynchronous processing using ConcurrentQueue
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Changing asynchronous processing order ConcurrentStack
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Creating a scalable crawler with ConcurrentBag
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Generalizing asynchronous processing with BlockingCollection
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7. Using PLINQ
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7. Using PLINQ
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Introduction
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Using the Parallel class
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Parallelizing a LINQ query
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Tweaking the parameters of a PLINQ query
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Handling exceptions in a PLINQ query
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Managing data partitioning in a PLINQ query
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Creating a custom aggregator for a PLINQ query
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8. Reactive Extensions
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8. Reactive Extensions
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Introduction
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Converting a collection to asynchronous Observable
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Writing custom Observable
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Using Subjects
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Creating an Observable object
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Using LINQ queries against the observable collection
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Creating asynchronous operations with Rx
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9. Using Asynchronous I/O
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9. Using Asynchronous I/O
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Introduction
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Working with files asynchronously
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Writing an asynchronous HTTP server and client
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Working with a database asynchronously
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Calling a WCF service asynchronously
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10. Parallel Programming Patterns
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10. Parallel Programming Patterns
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Introduction
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Implementing Lazy-evaluated shared states
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Implementing Parallel Pipeline with BlockingCollection
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Implementing Parallel Pipeline with TPL DataFlow
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Implementing Map/Reduce with PLINQ
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11. There's More
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11. There's More
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Introduction
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Using a timer in a Windows Store application
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Using WinRT from usual applications
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Using BackgroundTask in Windows Store applications
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Index
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Index

Aborting a thread

In this recipe, we will describe how to abort another thread's execution.

Getting ready

To work through this recipe, you will need Visual Studio 2012. There are no other prerequisites. The source code for this recipe can be found at BookSamples\Chapter1\Recipe4.

How to do it...

To understand how to abort another thread's execution, perform the following steps:

  1. Start Visual Studio 2012. Create a new C# Console Application project.
  2. In the Program.cs file, add the following using directives:
    using System;
using System.Threading;
  3. Add the following code snippet below the Main method:
    static void PrintNumbersWithDelay()
{
  Console.WriteLine("Starting...");
  for (int i = 1; i < 10; i++)
  {
    Thread.Sleep(TimeSpan.FromSeconds(2));
    Console.WriteLine(i);
  }
}
  4. Add the following code snippet inside the Main method:
    Console.WriteLine("Starting program...");
Thread t = new Thread(PrintNumbersWithDelay);
t.Start();
Thread.Sleep(TimeSpan.FromSeconds(6));
t.Abort();
Console.WriteLine("A thread has been aborted");
Thread t = new Thread(PrintNumbers);
t.Start();
PrintNumbers();
  5. Run the program.

How it works...

When the main program and a separate number-printing thread run, we wait for 6 seconds and then call a t.Abort method on a thread. This injects a ThreadAbortException method into a thread causing it to terminate. It is very dangerous, generally because this exception can happen at any point and may totally destroy the application. In addition, it is not always possible to terminate a thread with this technique. The target thread may refuse to abort by handling this exception and calling the Thread.ResetAbort method. Thus, it is not recommended that you use the Abort method to close a thread. There are different methods that are preferred, such as providing a CancellationToken method to cancel a thread execution. This approach will be described in Chapter 3, Using a Thread Pool.

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