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The Idle Thread: Asynchronous Programming in C# and .NET
Paperback
Publisher: Independently Published
Published: Sep 2 2026
Pages: 122
Weight: 0.38
Height: 0.26 Width: 6.00 Depth: 9.00
Language: English
That is Skylark in chapter one: a flight-price aggregator that asks three airlines for a fare and holds a thread hostage through almost all of it.
Ten chapters later the same program queries forty carriers inside a two-second budget, streams each price to the browser as it lands, scores fifty thousand itineraries across eight cores, and cancels every outbound call the moment a user closes the tab. At two hundred requests a second its median response time is seventy milliseconds worse than at idle.
One program, rebuilt in the open. Every change comes with a measurement you can reproduce.
Plenty of C# developers type async and await daily and would struggle to say what happens to the calling thread when execution reaches an await, or why a service that looks perfectly healthy quietly stops answering under load. This book replaces pattern matching with a model.
What you'll work through
- What a thread costs, and the point where adding more of them stops helping
- What a Task really is, and how a thousand of them run on thirteen threads
- What the compiler writes when you type await, and how to read the stack traces it leaves behind
- Task.WhenAll, WhenAny and .NET 9's WhenEach, plus the one small omission that turns a fan-out back into a queue
- Cancellation, linked tokens, timeouts, and returning partial results when the clock runs out
- Why .Result deadlocks a WPF app and starves an ASP.NET Core one, and how to recognise starvation from a counters dashboard
- Where parallelism is the right tool and async has nothing to offer
- Async in a real service: EF Core, IHttpClientFactory, BackgroundService, channels, IAsyncEnumerable streaming
- ValueTask and its four rules, ExecutionContext, and what .NET 11's runtime async changes underneath you
Written for developers who already know C# - generics, LINQ, the shape of a .NET project. No prior multithreading experience assumed; chapter two starts from what a thread is.
Code targets .NET 10 LTS, with a closing chapter on .NET 11. A quick-reference appendix collects the combinators, the cancellation API, the diagnostic commands, and a table of anti-patterns with what to write instead.
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