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# Objective - Contributes to #15460 ## Solution - Added the following features: - `std` (default) - `async_executor` (default) - `edge_executor` - `critical-section` - `portable-atomic` - Added [`edge-executor`](https://crates.io/crates/edge-executor) as a `no_std` alternative to `async-executor`. - Updated the `single_threaded_task_pool` to work in `no_std` environments by gating its reliance on `thread_local`. ## Testing - Added to `compile-check-no-std` CI command ## Notes - In previous iterations of this PR, a custom `async-executor` alternative was vendored in. This raised concerns around maintenance and testing. In this iteration, an existing version of that same vendoring is now used, but _only_ in `no_std` contexts. For existing `std` contexts, the original `async-executor` is used. - Due to the way statics work, certain `TaskPool` operations have added restrictions around `Send`/`Sync` in `no_std`. This is because there isn't a straightforward way to create a thread-local in `no_std`. If these added constraints pose an issue we can revisit this at a later date. - If a user enables both the `async_executor` and `edge_executor` features, we will default to using `async-executor`. Since enabling `async_executor` requires `std`, we can safely assume we are in an `std` context and use the original library. --------- Co-authored-by: Mike <2180432+hymm@users.noreply.github.com> Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> |
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