Function tokio::task::spawn_local

source ·
pub fn spawn_local<F>(future: F) -> JoinHandle<F::Output> where
    F: Future + 'static,
    F::Output: 'static,
Expand description

Spawns a !Send future on the current LocalSet.

The spawned future will run on the same thread that called spawn_local.

You do not have to .await the returned JoinHandle to make the provided future start execution. It will start running in the background immediately when spawn_local is called.


This function panics if called outside of a LocalSet.

Note that if tokio::spawn is used from within a LocalSet, the resulting new task will not be inside the LocalSet, so you must use use spawn_local if you want to stay within the LocalSet.


use std::rc::Rc;
use tokio::task;

async fn main() {
    let unsend_data = Rc::new("my unsend data...");

    let local = task::LocalSet::new();

    // Run the local task set.
    local.run_until(async move {
        let unsend_data = unsend_data.clone();
        task::spawn_local(async move {
            println!("{}", unsend_data);
            // ...