https://github.com/smol-rs/event-listener

Notify async tasks or threads
https://github.com/smol-rs/event-listener

rust

Last synced: 5 days ago
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Notify async tasks or threads

• Host: GitHub
• URL: https://github.com/smol-rs/event-listener
• Owner: smol-rs
• License: apache-2.0
• Created: 2020-05-16T17:41:11.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2025-01-25T14:44:37.000Z (27 days ago)
• Last Synced: 2025-02-09T12:00:21.265Z (12 days ago)
• Topics: rust
• Language: Rust
• Homepage:
• Size: 309 KB
• Stars: 459
• Watchers: 9
• Forks: 33
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE-APACHE

Awesome Lists containing this project

• awesome-rust-list - event-listener - rs/event-listener?style=social"/> : Notify async tasks or threads. (Parallel and Async Library)
• awesome-rust-list - event-listener - rs/event-listener?style=social"/> : Notify async tasks or threads. (Parallel and Async Library)

README

        
# event-listener

[![Build](https://github.com/smol-rs/event-listener/workflows/CI/badge.svg)](

https://github.com/smol-rs/event-listener/actions)

[![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](

https://github.com/smol-rs/event-listener)

[![Cargo](https://img.shields.io/crates/v/event-listener.svg)](

https://crates.io/crates/event-listener)

[![Documentation](https://docs.rs/event-listener/badge.svg)](

https://docs.rs/event-listener)

Notify async tasks or threads.

This is a synchronization primitive similar to [eventcounts] invented by Dmitry Vyukov.

You can use this crate to turn non-blocking data structures into async or blocking data

structures. See a [simple mutex] implementation that exposes an async and a blocking interface

for acquiring locks.

[eventcounts]: https://www.1024cores.net/home/lock-free-algorithms/eventcounts

[simple mutex]: ./examples/mutex.rs

## Examples

Wait until another thread sets a boolean flag:

```rust

use std::sync::atomic::{AtomicBool, Ordering};

use std::sync::Arc;

use std::thread;

use std::time::Duration;

use event_listener::Event;

let flag = Arc::new(AtomicBool::new(false));

let event = Arc::new(Event::new());

// Spawn a thread that will set the flag after 1 second.

thread::spawn({

    let flag = flag.clone();

    let event = event.clone();

    move || {

        // Wait for a second.

        thread::sleep(Duration::from_secs(1));

        // Set the flag.

        flag.store(true, Ordering::SeqCst);

        // Notify all listeners that the flag has been set.

        event.notify(usize::MAX);

    }

});

// Wait until the flag is set.

loop {

    // Check the flag.

    if flag.load(Ordering::SeqCst) {

        break;

    }

    // Start listening for events.

    let listener = event.listen();

    // Check the flag again after creating the listener.

    if flag.load(Ordering::SeqCst) {

        break;

    }

    // Wait for a notification and continue the loop.

    listener.wait();

}

```

## License

Licensed under either of

 * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)

 * MIT license ([LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)

at your option.

#### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted

for inclusion in the work by you, as defined in the Apache-2.0 license, shall be

dual licensed as above, without any additional terms or conditions.