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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

Pinning in Rust

The following diagram shows a slightly more complex self-referential struct so that we have something visual to help us understand:

Figure 9.3 – Moving a self-referential struct with three fields

Figure 9.3 – Moving a self-referential struct with three fields

At a very high level, pinning makes it possible to rely on data that has a stable memory address by disallowing any operation that might move it:

Figure 9.4 – Moving a pinned struct

Figure 9.4 – Moving a pinned struct

The concept of pinning is pretty simple. The complex part is how it’s implemented in the language and how it’s used.

Pinning in theory

Pinning is a part of Rust’s standard library and consists of two parts: the type, Pin, and the marker-trait, Unpin. Pinning is only a language construct. There is no special kind of location or memory that you move values to so they get pinned. There is no syscall to ask the operating system to ensure a value stays the same place in memory. It’s only a part...

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