80972f1e0e
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.
49 lines
1.3 KiB
TOML
49 lines
1.3 KiB
TOML
[package]
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name = "embassy-sync"
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version = "0.1.0"
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edition = "2021"
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description = "no-std, no-alloc synchronization primitives with async support"
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repository = "https://github.com/embassy-rs/embassy"
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readme = "README.md"
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license = "MIT OR Apache-2.0"
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categories = [
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"embedded",
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"no-std",
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"concurrency",
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"asynchronous",
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]
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[package.metadata.embassy_docs]
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src_base = "https://github.com/embassy-rs/embassy/blob/embassy-sync-v$VERSION/embassy-sync/src/"
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src_base_git = "https://github.com/embassy-rs/embassy/blob/$COMMIT/embassy-sync/src/"
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features = ["nightly"]
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target = "thumbv7em-none-eabi"
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[package.metadata.docs.rs]
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features = ["nightly"]
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[features]
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nightly = ["embedded-io/async"]
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std = []
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turbowakers = []
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[dependencies]
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defmt = { version = "0.3", optional = true }
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log = { version = "0.4.14", optional = true }
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futures-util = { version = "0.3.17", default-features = false }
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critical-section = "1.1"
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heapless = "0.7.5"
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cfg-if = "1.0.0"
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embedded-io = "0.4.0"
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[dev-dependencies]
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futures-executor = { version = "0.3.17", features = [ "thread-pool" ] }
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futures-test = "0.3.17"
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futures-timer = "3.0.2"
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futures-util = { version = "0.3.17", features = [ "channel" ] }
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# Enable critical-section implementation for std, for tests
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critical-section = { version = "1.1", features = ["std"] }
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static_cell = "1.0"
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