Asynchronous Programming

Crates to help you deal with events independently of the main program flow, using techniques like futures, promises, waiting, or eventing.

Useful Crates

• Runtimes: tokio⮳, async-std⮳, smol⮳.
• Futures/Streams: futures⮳, tokio-stream⮳.
• Async I/O: tokio⮳, async-std⮳.

Async Basics

Recipe	Crates	Categories
Basic Example
Differences with Other Languages
Which Crate Provides What?
Async Runtimes

Futures

Recipe	Crates	Categories
Selecting Futures
Joining Futures
Map, then, either, flatten
futures-util

Tokio Runtime

Recipe	Crates	Categories
Basics
Join
Spawning
IO
Graceful Shutdown

Async Channels

Recipe	Crates	Categories
OneShot
Send Messages from Multiple Producers to a Single Consumer
Broadcast Messages from Multiple Producers to Multiple Consumers
kanal
Send Messages from Multiple Producers to One of Multiple Consumers
tokio's Async Channels

Async Traits

Recipe	Crates	Categories
Async Traits

Streams

Recipe	Crates	Categories
Streams

Calling Async from Blocking Code and Vice Versa

Recipe	Crates	Categories
Call Blocking Code from Async Code
Use spawn_blocking
Use the rayon Crate
Spawn a Dedicated Thread
Call Async Code from Blocking Code
Use the futures Executor
Use the Tokio Runtime Directly

Async Utilities

Recipe	Crates	Categories
Visualize the Structure of Asynchronous Tasks and Their Dependencies

Related Topics

Networking / Websocket / HTTP

tokio-tungstenite⮳, hyper⮳, reqwest⮳.

• Network Programming.
• Web Programming HTTP Client.
• Web Programming HTTP Server.
• Web Programming Websocket.

Concurrency: tokio::sync, async-channel⮳

• Concurrency.
• Concurrent Data Structures.
• Async Channels.