Channels

In the previous tutorial, we learned async programming with Tokio. Now we dive deeper into channels — the primary way async tasks communicate with each other. Channels let tasks send and receive messages without sharing memory directly. This is the “message passing” model of concurrency. Instead of locking shared data with a Mutex, you send data through a channel. The task that receives it owns it completely. Tokio provides four channel types. Each one solves a different problem. By the end of this tutorial, you will know when to use each one. ...

In the previous tutorial, you learned the basics of coroutines: suspend functions, launch, async, and structured concurrency. Now let’s dive deeper into error handling, supervisor jobs, and channels. In this tutorial, you will learn: CoroutineExceptionHandler SupervisorJob and supervisorScope Channels (send, receive, close) Channel types (buffered, conflated, unlimited) produce and consumeEach Fan-out and fan-in patterns select expression Mutex for shared mutable state withTimeout and withTimeoutOrNull Practical patterns Error Handling in Coroutines Error handling in coroutines is different from regular code. When a coroutine throws an exception, the behavior depends on whether you use launch or async. ...