ddc9599d5e
# Objective Follow up to #13062. As of async-executor 1.11, the crate reexports FallibleTask, which is the only reason bevy_tasks has a direct dependency on async-task. This should avoid the two dependencies getting out of sync in the future and causing spurious compilation failures. ## Solution Bump async-executor to 1.11, use the reexport, remove the dependency on async-task.
61 lines
2.0 KiB
Rust
61 lines
2.0 KiB
Rust
use std::{
|
|
future::Future,
|
|
pin::Pin,
|
|
task::{Context, Poll},
|
|
};
|
|
|
|
/// Wraps `async_executor::Task`, a spawned future.
|
|
///
|
|
/// Tasks are also futures themselves and yield the output of the spawned future.
|
|
///
|
|
/// When a task is dropped, its gets canceled and won't be polled again. To cancel a task a bit
|
|
/// more gracefully and wait until it stops running, use the [`Task::cancel()`] method.
|
|
///
|
|
/// Tasks that panic get immediately canceled. Awaiting a canceled task also causes a panic.
|
|
#[derive(Debug)]
|
|
#[must_use = "Tasks are canceled when dropped, use `.detach()` to run them in the background."]
|
|
pub struct Task<T>(async_executor::Task<T>);
|
|
|
|
impl<T> Task<T> {
|
|
/// Creates a new task from a given `async_executor::Task`
|
|
pub fn new(task: async_executor::Task<T>) -> Self {
|
|
Self(task)
|
|
}
|
|
|
|
/// Detaches the task to let it keep running in the background. See
|
|
/// `async_executor::Task::detach`
|
|
pub fn detach(self) {
|
|
self.0.detach();
|
|
}
|
|
|
|
/// Cancels the task and waits for it to stop running.
|
|
///
|
|
/// Returns the task's output if it was completed just before it got canceled, or [`None`] if
|
|
/// it didn't complete.
|
|
///
|
|
/// While it's possible to simply drop the [`Task`] to cancel it, this is a cleaner way of
|
|
/// canceling because it also waits for the task to stop running.
|
|
///
|
|
/// See `async_executor::Task::cancel`
|
|
pub async fn cancel(self) -> Option<T> {
|
|
self.0.cancel().await
|
|
}
|
|
|
|
/// Returns `true` if the current task is finished.
|
|
///
|
|
///
|
|
/// Unlike poll, it doesn't resolve the final value, it just checks if the task has finished.
|
|
/// Note that in a multithreaded environment, this task can be finished immediately after calling this function.
|
|
pub fn is_finished(&self) -> bool {
|
|
self.0.is_finished()
|
|
}
|
|
}
|
|
|
|
impl<T> Future for Task<T> {
|
|
type Output = T;
|
|
|
|
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
|
|
Pin::new(&mut self.0).poll(cx)
|
|
}
|
|
}
|