bevy/crates/bevy_tasks
Mike 8eb8ad5c4a await tasks to cancel (#6696)
# Objective

- Fixes https://github.com/bevyengine/bevy/issues/6603

## Solution

- `Task`s will cancel when dropped, but wait until they return Pending before they actually get canceled. That means that if a task panics, it's possible for that error to get propagated to the scope and the scope gets dropped, while scoped tasks in other threads are still running. This is a big problem since scoped task can hold life-timed values that are dropped as the scope is dropped leading to UB.

---

## Changelog

- changed `Scope` to use `FallibleTask` and await the cancellation of all remaining tasks when it's dropped.
2022-11-23 00:41:19 +00:00
..
examples small and mostly pointless refactoring (#2934) 2022-02-13 22:33:55 +00:00
src await tasks to cancel (#6696) 2022-11-23 00:41:19 +00:00
Cargo.toml Release 0.9.0 (#6568) 2022-11-12 20:01:29 +00:00
README.md Cleanup of Markdown Files and add CI Checking (#1463) 2021-02-22 04:50:05 +00:00

bevy_tasks

A refreshingly simple task executor for bevy. :)

This is a simple threadpool with minimal dependencies. The main usecase is a scoped fork-join, i.e. spawning tasks from a single thread and having that thread await the completion of those tasks. This is intended specifically for bevy as a lighter alternative to rayon for this specific usecase. There are also utilities for generating the tasks from a slice of data. This library is intended for games and makes no attempt to ensure fairness or ordering of spawned tasks.

It is based on async-executor, a lightweight executor that allows the end user to manage their own threads. async-executor is based on async-task, a core piece of async-std.

Dependencies

A very small dependency list is a key feature of this module

├── async-executor
│   ├── async-task
│   ├── concurrent-queue
│   │   └── cache-padded
│   └── fastrand
├── num_cpus
│   └── libc
├── parking
└── futures-lite