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Asynchronous Programming in Rust

You're reading from  Asynchronous Programming in Rust

Product type Book
Published in Feb 2024
Publisher Packt
ISBN-13 9781805128137
Pages 306 pages
Edition 1st Edition
Languages
Author (1):
Carl Fredrik Samson Carl Fredrik Samson
Profile icon Carl Fredrik Samson

Table of Contents (16) Chapters

Preface 1. Part 1:Asynchronous Programming Fundamentals
2. Chapter 1: Concurrency and Asynchronous Programming: a Detailed Overview 3. Chapter 2: How Programming Languages Model Asynchronous Program Flow 4. Chapter 3: Understanding OS-Backed Event Queues, System Calls, and Cross-Platform Abstractions 5. Part 2:Event Queues and Green Threads
6. Chapter 4: Create Your Own Event Queue 7. Chapter 5: Creating Our Own Fibers 8. Part 3:Futures and async/await in Rust
9. Chapter 6: Futures in Rust 10. Chapter 7: Coroutines and async/await 11. Chapter 8: Runtimes, Wakers, and the Reactor-Executor Pattern 12. Chapter 9: Coroutines, Self-Referential Structs, and Pinning 13. Chapter 10: Creating Your Own Runtime 14. Index 15. Other Books You May Enjoy

Creating a proper runtime

So, if we visualize the degree of dependency between the different parts of our runtime, our current design could be described this way:

Figure 8.5 – Tight coupling between reactor and executor

Figure 8.5 – Tight coupling between reactor and executor

If we want a loose coupling between the reactor and executor, we need an interface provided to signal the executor that it should wake up when an event that allows a future to progress has occurred. It’s no coincidence that this type is called Waker (https://doc.rust-lang.org/stable/std/task/struct.Waker.html) in Rust’s standard library. If we change our visualization to reflect this, it will look something like this:

Figure 8.6 – A loosely coupled reactor and executor

Figure 8.6 – A loosely coupled reactor and executor

It’s no coincidence that we land on the same design as what we have in Rust today. It’s a minimal design from Rust’s point of view, but it allows for a wide variety of runtime designs without laying...

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