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embassy/embassy-sync
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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
..
src executor,sync: add support for turbo-wakers. 2023-03-30 17:55:55 +02:00
build.rs split embassy-util into embassy-futures, embassy-sync. 2022-08-22 22:18:13 +02:00
Cargo.toml executor,sync: add support for turbo-wakers. 2023-03-30 17:55:55 +02:00
README.md Add required info to embassy-sync package 2022-10-04 16:38:11 +02:00

README.md

embassy-sync

An Embassy project.

Synchronization primitives and data structures with async support:

  • Channel - A Multiple Producer Multiple Consumer (MPMC) channel. Each message is only received by a single consumer.
  • PubSubChannel - A broadcast channel (publish-subscribe) channel. Each message is received by all consumers.
  • Signal - Signalling latest value to a single consumer.
  • Mutex - Mutex for synchronizing state between asynchronous tasks.
  • Pipe - Byte stream implementing embedded_io traits.
  • WakerRegistration - Utility to register and wake a Waker.
  • AtomicWaker - A variant of WakerRegistration accessible using a non-mut API.
  • MultiWakerRegistration - Utility registering and waking multiple Waker's.

Interoperability

Futures from this crate can run on any executor.

Minimum supported Rust version (MSRV)

Embassy is guaranteed to compile on the latest stable Rust version at the time of release. It might compile with older versions but that may change in any new patch release.

License

This work is licensed under either of

at your option.