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Multithreading with C# Cookbook, Second Edition

Multithreading with C# Cookbook, Second Edition - Second Edition

By : Agafonov
2.8 (4)
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Multithreading with C# Cookbook, Second Edition

Multithreading with C# Cookbook, Second Edition

2.8 (4)
By: Agafonov
Buy this Book

Overview of this book

Multi-core processors are synonymous with computing speed and power in today’s world, which is why multithreading has become a key concern for C# developers. Multithreaded code helps you create effective, scalable, and responsive applications. This is an easy-to-follow guide that will show you difficult programming problems in context. You will learn how to solve them with practical, hands-on, recipes. With these recipes, you’ll be able to start creating your own scalable and reliable multithreaded applications. Starting from learning what a thread is, we guide you through the basics and then move on to more advanced concepts such as task parallel libraries, C# asynchronous functions, and much more. Rewritten to the latest C# specification, C# 6, and updated with new and modern recipes to help you make the most of the hardware you have available, this book will help you push the boundaries of what you thought possible in C#.
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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A 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 the Task Parallel Library
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4. Using the 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
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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 cancelation option
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Handling exceptions in tasks
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Running tasks in parallel
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Tweaking the execution of tasks with TaskScheduler
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5. Using C# 6.0
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5. Using C# 6.0
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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
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Handling exceptions in asynchronous operations
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Avoiding the use of 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 with 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 an asynchronous Observable
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Writing custom Observable
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Using the Subject type family
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Creating an Observable object
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Using LINQ queries against an 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 Universal Windows Platform application
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Using WinRT from usual applications
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Using BackgroundTask in Universal Windows Platform applications
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Running a .NET Core application on OS X
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Running a .NET Core application on Ubuntu Linux
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Index
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Index

Pausing a thread

This recipe will show you how to make a thread wait for some time without wasting operating system resources.

Getting ready

To work through this recipe, you will need Visual Studio 2015. There are no other prerequisites. The source code for this recipe can be found at BookSamples\Chapter1\Recipe2.

How to do it...

To understand how to make a thread wait without wasting operating system resources, perform the following steps:

  1. Start Visual Studio 2015. Create a new C# console application project.
  2. In the Program.cs file, add the following using directives:
    using System;
using System.Threading;
using static System.Console;
using static System.Threading.Thread;
  3. Add the following code snippet below the Main method:
    static void PrintNumbers()
{
  WriteLine("Starting...");
  for (int i = 1; i < 10; i++)
  {
    WriteLine(i);
  }
}
static void PrintNumbersWithDelay()
{
  WriteLine("Starting...");
  for (int i = 1; i < 10; i++)
  {
    Sleep(TimeSpan.FromSeconds(2));
    WriteLine(i);
  }
}
  4. Add the following code snippet inside the Main method:
    Thread t = new Thread(PrintNumbersWithDelay);
t.Start();
PrintNumbers();
  5. Run the program.

How it works...

When the program is run, it creates a thread that will execute a code in the PrintNumbersWithDelay method. Immediately after that, it runs the PrintNumbers method. The key feature here is adding the Thread.Sleep method call to a PrintNumbersWithDelay method. It causes the thread executing this code to wait a specified amount of time (2 seconds in our case) before printing each number. While a thread sleeps, it uses as little CPU time as possible. As a result, we will see that the code in the PrintNumbers method, which usually runs later, will be executed before the code in the PrintNumbersWithDelay method in a separate thread.

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