Professional C# and .NET, 2021st Edition

17Parallel Programming

WHAT'S IN THIS CHAPTER?

• Understanding multithreading
• Working with the Parallel class
• Working with tasks
• Using the Cancellation framework
• Publish/subscribe with channels
• Working with timers
• Understanding threading issues
• Using the lock keyword
• Synchronizing with Monitor
• Synchronizing with mutexes
• Working with semaphores
• Using ManualResetEvent, AutoResetEvent, and CountdownEvent
• Working with Barrier
• Managing readers and writers with ReaderWriterLockSlim

CODE DOWNLOADS FOR THIS CHAPTER

The source code for this chapter is available on the book page at www.wiley.com. Click the Downloads link. The code can also be found at https://github.com/ProfessionalCSharp/ProfessionalCSharp2021 in the directory 2_Libs/Parallel.

The code for this chapter is divided into the following major examples:

• Parallel
• Task
• Cancellation
• ChannelSample
• Timer
• WinAppTimer
• ThreadingIssues
• SynchronizationSamples
• BarrierSample
• ReaderWriterLockSample
• LockAcrossAwait

Samples from this chapter make use of the System.Threading, System.Threading.Tasks, and System.Linq namespaces. All the projects have nullable reference types enabled.

OVERVIEW

There are several reasons for using multiple threads. Suppose you are making a network call from an application that might take some time. You don't want to stall the user interface and force the user to wait idly until the response is returned from the server. The user could perform some other actions in the meantime or even cancel ...