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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
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

Discovering self-referential structs

What happened is that we created a self-referential struct, initialized it so that it took a pointer to itself, and then moved it. Let’s take a closer look:

  1. First, we received a future object as an argument to block_on. This is not a problem since the future isn’t self-referential yet, so we can move it around wherever we want to without issues (this is also why moving futures before they’re polled is perfectly fine using proper async/await).
  2. Then, we polled the future once. The optimization we did made one essential change. The future was located on the stack (inside the stack frame of our block_on function) when we polled it the first time.
  3. When we polled the future the first time, we initialized the variables to their initial state. Our writer variable took a pointer to our buffer variable (stored as a part of our coroutine) and made it self-referential at this point.
  4. The first time we polled the future...
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