5f42c9ab6d
# Objective - Resolve several warnings encountered when compiling for `no_std` around `dead_code` - Fix compatibility with `wasm32-unknown-unknown` when using `no_std` (identified by Sachymetsu on [Discord](https://discord.com/channels/691052431525675048/692572690833473578/1323365426901549097)) ## Solution - Removed some unused imports - Added `allow(dead_code)` for certain private items when compiling on `no_std` - Fixed `bevy_app` and `bevy_tasks` compatibility with WASM when compiling without `std` by appropriately importing `Box` and feature gating panic unwinding ## Testing - CI
61 lines
2.0 KiB
Rust
61 lines
2.0 KiB
Rust
use core::{
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future::Future,
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pin::Pin,
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task::{Context, Poll},
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};
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/// Wraps `async_executor::Task`, a spawned future.
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///
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/// Tasks are also futures themselves and yield the output of the spawned future.
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///
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/// When a task is dropped, its gets canceled and won't be polled again. To cancel a task a bit
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/// more gracefully and wait until it stops running, use the [`Task::cancel()`] method.
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///
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/// Tasks that panic get immediately canceled. Awaiting a canceled task also causes a panic.
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#[derive(Debug)]
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#[must_use = "Tasks are canceled when dropped, use `.detach()` to run them in the background."]
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pub struct Task<T>(async_task::Task<T>);
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impl<T> Task<T> {
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/// Creates a new task from a given `async_executor::Task`
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pub fn new(task: async_task::Task<T>) -> Self {
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Self(task)
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}
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/// Detaches the task to let it keep running in the background. See
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/// `async_executor::Task::detach`
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pub fn detach(self) {
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self.0.detach();
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}
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/// Cancels the task and waits for it to stop running.
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///
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/// Returns the task's output if it was completed just before it got canceled, or [`None`] if
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/// it didn't complete.
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///
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/// While it's possible to simply drop the [`Task`] to cancel it, this is a cleaner way of
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/// canceling because it also waits for the task to stop running.
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///
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/// See `async_executor::Task::cancel`
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pub async fn cancel(self) -> Option<T> {
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self.0.cancel().await
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}
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/// Returns `true` if the current task is finished.
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///
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///
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/// Unlike poll, it doesn't resolve the final value, it just checks if the task has finished.
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/// Note that in a multithreaded environment, this task can be finished immediately after calling this function.
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pub fn is_finished(&self) -> bool {
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self.0.is_finished()
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}
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}
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impl<T> Future for Task<T> {
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type Output = T;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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Pin::new(&mut self.0).poll(cx)
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}
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}
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