Struct smol::LocalExecutor

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pub struct LocalExecutor<'a> { /* private fields */ }

Expand description

A thread-local executor.

The executor can only be run on the thread that created it.

Examples

use async_executor::LocalExecutor;
use futures_lite::future;

let local_ex = LocalExecutor::new();

future::block_on(local_ex.run(async {
    println!("Hello world!");
}));

Implementations§

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impl<'a> LocalExecutor<'a>

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pub const fn new() -> LocalExecutor<'a>

Creates a single-threaded executor.

Examples

use async_executor::LocalExecutor;

let local_ex = LocalExecutor::new();

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pub fn is_empty(&self) -> bool

Returns true if there are no unfinished tasks.

Examples

use async_executor::LocalExecutor;

let local_ex = LocalExecutor::new();
assert!(local_ex.is_empty());

let task = local_ex.spawn(async {
    println!("Hello world");
});
assert!(!local_ex.is_empty());

assert!(local_ex.try_tick());
assert!(local_ex.is_empty());

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pub fn spawn<T>(&self, future: impl Future<Output = T> + 'a) -> Task<T> ⓘwhere
T: 'a,

Spawns a task onto the executor.

Examples

use async_executor::LocalExecutor;

let local_ex = LocalExecutor::new();

let task = local_ex.spawn(async {
    println!("Hello world");
});

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pub fn try_tick(&self) -> bool

Attempts to run a task if at least one is scheduled.

Running a scheduled task means simply polling its future once.

Examples

use async_executor::LocalExecutor;

let ex = LocalExecutor::new();
assert!(!ex.try_tick()); // no tasks to run

let task = ex.spawn(async {
    println!("Hello world");
});
assert!(ex.try_tick()); // a task was found

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pub async fn tick(&self) -> impl Future<Output = ()>

Runs a single task.

Running a task means simply polling its future once.

If no tasks are scheduled when this method is called, it will wait until one is scheduled.

Examples

use async_executor::LocalExecutor;
use futures_lite::future;

let ex = LocalExecutor::new();

let task = ex.spawn(async {
    println!("Hello world");
});
future::block_on(ex.tick()); // runs the task

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pub async fn run<T>(
&self,
future: impl Future<Output = T>
) -> impl Future<Output = T>

Runs the executor until the given future completes.

Examples

use async_executor::LocalExecutor;
use futures_lite::future;

let local_ex = LocalExecutor::new();

let task = local_ex.spawn(async { 1 + 2 });
let res = future::block_on(local_ex.run(async { task.await * 2 }));

assert_eq!(res, 6);