Commit Graph

8 Commits

Author SHA1 Message Date
Dario Nieuwenhuis
80972f1e0e executor,sync: add support for turbo-wakers.
This is a `core` patch to make wakers 1 word (the task pointer) instead of 2 (task pointer + vtable). It allows having the "waker optimization" we had a while back on `WakerRegistration/AtomicWaker`, but EVERYWHERE, without patching all crates.

Advantages:
- Less memory usage.
- Faster.
- `AtomicWaker` can actually use atomics to load/store the waker, No critical section needed.
- No `dyn` call, which means `cargo-call-stack` can now see through wakes.

Disadvantages:
- You have to patch `core`...
- Breaks all executors and other things that create wakers, unless they opt in to using the new `from_ptr` API.

How to use:

- Run this shell script to patch `core`. https://gist.github.com/Dirbaio/c67da7cf318515181539122c9d32b395
- Enable `build-std`
- Enable `build-std-features = core/turbowakers`
- Enable feature `turbowakers` in `embassy-executor`, `embassy-sync`.
- Make sure you have no other crate creating wakers other than `embassy-executor`. These will panic at runtime.

Note that the patched `core` is equivalent to the unpached one when the `turbowakers` feature is not enabled, so it should be fine to leave it there.
2023-03-30 17:55:55 +02:00
Dario Nieuwenhuis
10c9cc31b1 Remove unnecessary use of atomic-polyfill.
Only use it when CAS is actually needed.
2022-12-23 20:46:49 +01:00
Dario Nieuwenhuis
1e2fb0459d Switch to async-fn-in-trait 2022-11-25 21:02:06 +01:00
Dario Nieuwenhuis
d2246ae693 Release embassy-sync, embassy-time v0.1.0 2022-10-26 22:13:27 +02:00
Dario Nieuwenhuis
eeb072d9cb Update Rust nightly. 2022-10-26 16:47:29 +02:00
Ulf Lilleengen
59765590e0 Add required info to embassy-sync package
Updates the README.md based on embassy-futures structure.
2022-10-04 16:38:11 +02:00
Ulf Lilleengen
782751dfb9 Add missing std feature for embassy-sync
Fixes #930
2022-08-29 10:28:01 +02:00
Dario Nieuwenhuis
21072bee48 split embassy-util into embassy-futures, embassy-sync. 2022-08-22 22:18:13 +02:00