task-local

Task-local storage for asynchronous tasks, extracted from the tokio::task_local module.

This crate provides a way to store task-local values across .await points without requiring the Tokio runtime.

Overview

Task-local storage allows you to store and access data that is local to the current asynchronous task. Unlike thread-local storage, task-local values are preserved across .await points within the same task.

Usage

Add this to your Cargo.toml:

[dependencies]
task-local = "0.1.0"

Example

use task_local::task_local;

task_local! {
    static NUMBER: u32;
}

async fn example() {
    NUMBER.scope(1, async {
        // The value 1 is accessible within this async block
        assert_eq!(NUMBER.get(), 1);

        // It's also accessible across .await points
        some_async_function().await;
        assert_eq!(NUMBER.get(), 1);

        // You can nest scopes
        NUMBER.scope(2, async {
            assert_eq!(NUMBER.get(), 2);
        }).await;

        // After the nested scope, the original value is restored
        assert_eq!(NUMBER.get(), 1);
    }).await;
}

async fn some_async_function() {
    // The task-local value is still accessible here
    assert_eq!(NUMBER.get(), 1);
}

License

Licensed under either of

Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution