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Vendor dependencies for 0.3.0 release

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Robert Garrett
2025-09-27 10:29:08 -05:00
parent 0c8d39d483
commit 82ab7f317b
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# Version 1.13.3
- Avoid places where the code had a possibility to block or panic. (#147)
# Version 1.13.2
- Fix build failure with minimal-versions. (#132)
- Prevent executor from becoming unusable by panic of the iterator passed by the user to the `spawn_many`. (#136)
- Reduce memory footprint. (#137)
# Version 1.13.1
- Fix docs.rs build. (#125)
# Version 1.13.0
- Relax the `Send` bound on `LocalExecutor::spawn_many`. (#120)
- Ensure all features are documented on `docs.rs`. (#122)
# Version 1.12.0
- Add static executors, which are an optimization over executors that are kept
around forever. (#112)
# Version 1.11.0
- Re-export the `async_task::FallibleTask` primitive. (#113)
- Support racy initialization of the executor state. This should allow the executor to be
initialized on web targets without any issues. (#108)
# Version 1.10.0
- Add a function `spawn_batch` that allows users to spawn multiple tasks while only locking the executor once. (#92)
# Version 1.9.1
- Remove the thread-local optimization due to the bugs that it introduces. (#106)
# Version 1.9.0
- Re-introduce the thread-local task push optimization to the executor. (#93)
- Bump `async-task` to v4.4.0. (#90)
- Replace some unnecessary atomic operations with non-atomic operations. (#94)
- Use weaker atomic orderings for notifications. (#95)
- When spawning a future, avoid looking up the ID to assign to that future twice. (#96)
# Version 1.8.0
- When spawned tasks panic, the panic is caught and then surfaced in the spawned
`Task`. Previously, the panic would be surfaced in `tick()` or `run()`. (#78)
# Version 1.7.2
- Fix compilation under WebAssembly targets (#77).
# Version 1.7.1
- Fix compilation under WebAssembly targets (#75).
- Add a disclaimer indicating that this is a reference executor (#74).
# Version 1.7.0
- Bump `async-lock` and `futures-lite` to their latest versions. (#70)
# Version 1.6.0
- Remove the thread-local queue optimization, as it caused a number of bugs in production use cases. (#61)
# Version 1.5.4
- Fix a panic that could happen when two concurrent `run()` calls are made and the thread local task slot is left as `None`. (#55)
# Version 1.5.3
- Fix an accidental breaking change in v1.5.2, where `ex.run()` was no longer `Send`. (#50)
- Remove the unused `memchr` dependency. (#51)
# Version 1.5.2
- Add thread-local task queue optimizations, allowing new tasks to avoid using the global queue. (#37)
- Update `fastrand` to v2. (#45)
# Version 1.5.1
- Implement a better form of debug output for Executor and LocalExecutor. (#33)
# Version 1.5.0
- Remove the dependency on the `once_cell` crate to restore the MSRV. (#29)
- Update `concurrent-queue` to v2.
# Version 1.4.1
- Remove dependency on deprecated `vec-arena`. (#23)
# Version 1.4.0
- Add `Executor::is_empty()` and `LocalExecutor::is_empty()`.
# Version 1.3.0
- Parametrize executors over a lifetime to allow spawning non-`static` futures.
# Version 1.2.0
- Update `async-task` to v4.
# Version 1.1.1
- Replace `AtomicU64` with `AtomicUsize`.
# Version 1.1.0
- Use atomics to make `Executor::run()` and `Executor::tick()` futures `Send + Sync`.
# Version 1.0.0
- Stabilize.
# Version 0.2.1
- Add `try_tick()` and `tick()` methods.
# Version 0.2.0
- Redesign the whole API.
# Version 0.1.2
- Add the `Spawner` API.
# Version 0.1.1
- Initial version

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.63"
name = "async-executor"
version = "1.13.3"
authors = [
"Stjepan Glavina <stjepang@gmail.com>",
"John Nunley <dev@notgull.net>",
]
build = false
exclude = ["/.*"]
autolib = false
autobins = false
autoexamples = false
autotests = false
autobenches = false
description = "Async executor"
readme = "README.md"
keywords = [
"asynchronous",
"executor",
"single",
"multi",
"spawn",
]
categories = [
"asynchronous",
"concurrency",
]
license = "Apache-2.0 OR MIT"
repository = "https://github.com/smol-rs/async-executor"
[package.metadata.docs.rs]
all-features = true
[features]
static = []
[lib]
name = "async_executor"
path = "src/lib.rs"
[[example]]
name = "limit"
path = "examples/limit.rs"
[[example]]
name = "priority"
path = "examples/priority.rs"
[[test]]
name = "different_executors"
path = "tests/different_executors.rs"
[[test]]
name = "drop"
path = "tests/drop.rs"
[[test]]
name = "larger_tasks"
path = "tests/larger_tasks.rs"
[[test]]
name = "local_queue"
path = "tests/local_queue.rs"
[[test]]
name = "panic_prop"
path = "tests/panic_prop.rs"
[[test]]
name = "spawn_many"
path = "tests/spawn_many.rs"
[[bench]]
name = "executor"
path = "benches/executor.rs"
harness = false
required-features = ["static"]
[dependencies.async-task]
version = "4.4.0"
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[dependencies.fastrand]
version = "2.0.0"
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default-features = false
[dependencies.pin-project-lite]
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[dev-dependencies.async-channel]
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[target.'cfg(target_family = "wasm")'.dependencies.futures-lite]
version = "2.0.0"
features = ["std"]
default-features = false

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Apache License
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Permission is hereby granted, free of charge, to any
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# async-executor
[![Build](https://github.com/smol-rs/async-executor/actions/workflows/ci.yml/badge.svg)](
https://github.com/smol-rs/async-executor/actions)
[![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](
https://github.com/smol-rs/async-executor)
[![Cargo](https://img.shields.io/crates/v/async-executor.svg)](
https://crates.io/crates/async-executor)
[![Documentation](https://docs.rs/async-executor/badge.svg)](
https://docs.rs/async-executor)
Async executors.
This crate provides two reference executors that trade performance for
functionality. They should be considered reference executors that are "good
enough" for most use cases. For more specialized use cases, consider writing
your own executor on top of [`async-task`].
[`async-task`]: https://crates.io/crates/async-task
## Examples
```rust
use async_executor::Executor;
use futures_lite::future;
// Create a new executor.
let ex = Executor::new();
// Spawn a task.
let task = ex.spawn(async {
println!("Hello world");
});
// Run the executor until the task completes.
future::block_on(ex.run(task));
```
## License
Licensed under either of
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
#### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.

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#![allow(clippy::incompatible_msrv)] // false positive: https://github.com/rust-lang/rust-clippy/issues/12257#issuecomment-2093667187
use std::hint::black_box;
use std::mem;
use std::thread::available_parallelism;
use async_executor::{Executor, StaticExecutor};
use criterion::{criterion_group, criterion_main, Criterion};
use futures_lite::{future, prelude::*};
const TASKS: usize = 300;
const STEPS: usize = 300;
const LIGHT_TASKS: usize = 25_000;
static EX: Executor<'_> = Executor::new();
static STATIC_EX: StaticExecutor = StaticExecutor::new();
fn run(f: impl FnOnce(), multithread: bool) {
let limit = if multithread {
available_parallelism().unwrap().get()
} else {
1
};
let (s, r) = async_channel::bounded::<()>(1);
easy_parallel::Parallel::new()
.each(0..limit, |_| future::block_on(EX.run(r.recv())))
.finish(move || {
let _s = s;
f()
});
}
fn run_static(f: impl FnOnce(), multithread: bool) {
let limit = if multithread {
available_parallelism().unwrap().get()
} else {
1
};
let (s, r) = async_channel::bounded::<()>(1);
easy_parallel::Parallel::new()
.each(0..limit, |_| future::block_on(STATIC_EX.run(r.recv())))
.finish(move || {
let _s = s;
f()
});
}
fn create(c: &mut Criterion) {
c.bench_function("executor::create", |b| {
b.iter(|| {
let ex = Executor::new();
let task = ex.spawn(async {});
future::block_on(ex.run(task));
})
});
}
fn running_benches(c: &mut Criterion) {
for (prefix, with_static) in [("executor", false), ("static_executor", true)] {
for (group_name, multithread) in [("single_thread", false), ("multi_thread", true)].iter() {
let mut group = c.benchmark_group(group_name.to_string());
group.bench_function(format!("{prefix}::spawn_one"), |b| {
if with_static {
run_static(
|| {
b.iter(|| {
future::block_on(async { STATIC_EX.spawn(async {}).await });
});
},
*multithread,
);
} else {
run(
|| {
b.iter(|| {
future::block_on(async { EX.spawn(async {}).await });
});
},
*multithread,
);
}
});
if !with_static {
group.bench_function("executor::spawn_batch", |b| {
run(
|| {
let mut handles = vec![];
b.iter(|| {
EX.spawn_many((0..250).map(|_| future::yield_now()), &mut handles);
});
handles.clear();
},
*multithread,
)
});
}
group.bench_function(format!("{prefix}::spawn_many_local"), |b| {
if with_static {
run_static(
|| {
b.iter(move || {
future::block_on(async {
let mut tasks = Vec::new();
for _ in 0..LIGHT_TASKS {
tasks.push(STATIC_EX.spawn(async {}));
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
);
} else {
run(
|| {
b.iter(move || {
future::block_on(async {
let mut tasks = Vec::new();
for _ in 0..LIGHT_TASKS {
tasks.push(EX.spawn(async {}));
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
);
}
});
group.bench_function(format!("{prefix}::spawn_recursively"), |b| {
#[allow(clippy::manual_async_fn)]
fn go(i: usize) -> impl Future<Output = ()> + Send + 'static {
async move {
if i != 0 {
EX.spawn(async move {
let fut = go(i - 1).boxed();
fut.await;
})
.await;
}
}
}
#[allow(clippy::manual_async_fn)]
fn go_static(i: usize) -> impl Future<Output = ()> + Send + 'static {
async move {
if i != 0 {
STATIC_EX
.spawn(async move {
let fut = go_static(i - 1).boxed();
fut.await;
})
.await;
}
}
}
if with_static {
run_static(
|| {
b.iter(move || {
future::block_on(async {
let mut tasks = Vec::new();
for _ in 0..TASKS {
tasks.push(STATIC_EX.spawn(go_static(STEPS)));
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
);
} else {
run(
|| {
b.iter(move || {
future::block_on(async {
let mut tasks = Vec::new();
for _ in 0..TASKS {
tasks.push(EX.spawn(go(STEPS)));
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
);
}
});
group.bench_function(format!("{prefix}::yield_now"), |b| {
if with_static {
run_static(
|| {
b.iter(move || {
future::block_on(async {
let mut tasks = Vec::new();
for _ in 0..TASKS {
tasks.push(STATIC_EX.spawn(async move {
for _ in 0..STEPS {
future::yield_now().await;
}
}));
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
);
} else {
run(
|| {
b.iter(move || {
future::block_on(async {
let mut tasks = Vec::new();
for _ in 0..TASKS {
tasks.push(EX.spawn(async move {
for _ in 0..STEPS {
future::yield_now().await;
}
}));
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
);
}
});
group.bench_function(format!("{prefix}::channels"), |b| {
if with_static {
run_static(
|| {
b.iter(move || {
future::block_on(async {
// Create channels.
let mut tasks = Vec::new();
let (first_send, first_recv) = async_channel::bounded(1);
let mut current_recv = first_recv;
for _ in 0..TASKS {
let (next_send, next_recv) = async_channel::bounded(1);
let current_recv =
mem::replace(&mut current_recv, next_recv);
tasks.push(STATIC_EX.spawn(async move {
// Send a notification on to the next task.
for _ in 0..STEPS {
current_recv.recv().await.unwrap();
next_send.send(()).await.unwrap();
}
}));
}
for _ in 0..STEPS {
first_send.send(()).await.unwrap();
current_recv.recv().await.unwrap();
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
)
} else {
run(
|| {
b.iter(move || {
future::block_on(async {
// Create channels.
let mut tasks = Vec::new();
let (first_send, first_recv) = async_channel::bounded(1);
let mut current_recv = first_recv;
for _ in 0..TASKS {
let (next_send, next_recv) = async_channel::bounded(1);
let current_recv =
mem::replace(&mut current_recv, next_recv);
tasks.push(EX.spawn(async move {
// Send a notification on to the next task.
for _ in 0..STEPS {
current_recv.recv().await.unwrap();
next_send.send(()).await.unwrap();
}
}));
}
for _ in 0..STEPS {
first_send.send(()).await.unwrap();
current_recv.recv().await.unwrap();
}
for task in tasks {
task.await;
}
});
});
},
*multithread,
)
}
});
group.bench_function(format!("{prefix}::web_server"), |b| {
if with_static {
run_static(
|| {
b.iter(move || {
future::block_on(async {
let (db_send, db_recv) =
async_channel::bounded::<async_channel::Sender<_>>(
TASKS / 5,
);
let mut db_rng = fastrand::Rng::with_seed(0x12345678);
let mut web_rng = db_rng.fork();
// This task simulates a database.
let db_task = STATIC_EX.spawn(async move {
loop {
// Wait for a new task.
let incoming = match db_recv.recv().await {
Ok(incoming) => incoming,
Err(_) => break,
};
// Process the task. Maybe it takes a while.
for _ in 0..db_rng.usize(..10) {
future::yield_now().await;
}
// Send the data back.
incoming.send(db_rng.usize(..)).await.ok();
}
});
// This task simulates a web server waiting for new tasks.
let server_task = STATIC_EX.spawn(async move {
for i in 0..TASKS {
// Get a new connection.
if web_rng.usize(..=16) == 16 {
future::yield_now().await;
}
let mut web_rng = web_rng.fork();
let db_send = db_send.clone();
let task = STATIC_EX.spawn(async move {
// Check if the data is cached...
if web_rng.bool() {
// ...it's in cache!
future::yield_now().await;
return;
}
// Otherwise we have to make a DB call or two.
for _ in 0..web_rng.usize(STEPS / 2..STEPS) {
let (resp_send, resp_recv) =
async_channel::bounded(1);
db_send.send(resp_send).await.unwrap();
black_box(resp_recv.recv().await.unwrap());
}
// Send the data back...
for _ in 0..web_rng.usize(3..16) {
future::yield_now().await;
}
});
task.detach();
if i & 16 == 0 {
future::yield_now().await;
}
}
});
// Spawn and wait for it to stop.
server_task.await;
db_task.await;
});
})
},
*multithread,
)
} else {
run(
|| {
b.iter(move || {
future::block_on(async {
let (db_send, db_recv) =
async_channel::bounded::<async_channel::Sender<_>>(
TASKS / 5,
);
let mut db_rng = fastrand::Rng::with_seed(0x12345678);
let mut web_rng = db_rng.fork();
// This task simulates a database.
let db_task = EX.spawn(async move {
loop {
// Wait for a new task.
let incoming = match db_recv.recv().await {
Ok(incoming) => incoming,
Err(_) => break,
};
// Process the task. Maybe it takes a while.
for _ in 0..db_rng.usize(..10) {
future::yield_now().await;
}
// Send the data back.
incoming.send(db_rng.usize(..)).await.ok();
}
});
// This task simulates a web server waiting for new tasks.
let server_task = EX.spawn(async move {
for i in 0..TASKS {
// Get a new connection.
if web_rng.usize(..=16) == 16 {
future::yield_now().await;
}
let mut web_rng = web_rng.fork();
let db_send = db_send.clone();
let task = EX.spawn(async move {
// Check if the data is cached...
if web_rng.bool() {
// ...it's in cache!
future::yield_now().await;
return;
}
// Otherwise we have to make a DB call or two.
for _ in 0..web_rng.usize(STEPS / 2..STEPS) {
let (resp_send, resp_recv) =
async_channel::bounded(1);
db_send.send(resp_send).await.unwrap();
black_box(resp_recv.recv().await.unwrap());
}
// Send the data back...
for _ in 0..web_rng.usize(3..16) {
future::yield_now().await;
}
});
task.detach();
if i & 16 == 0 {
future::yield_now().await;
}
}
});
// Spawn and wait for it to stop.
server_task.await;
db_task.await;
});
})
},
*multithread,
)
}
});
}
}
}
criterion_group!(benches, create, running_benches);
criterion_main!(benches);

95
vendor/async-executor/examples/limit.rs vendored Normal file
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//! An executor where you can only push a limited number of tasks.
use async_executor::{Executor, Task};
use async_lock::Semaphore;
use std::{future::Future, sync::Arc, time::Duration};
/// An executor where you can only push a limited number of tasks.
struct LimitedExecutor {
/// Inner running executor.
executor: Executor<'static>,
/// Semaphore limiting the number of tasks.
semaphore: Arc<Semaphore>,
}
impl LimitedExecutor {
fn new(max: usize) -> Self {
Self {
executor: Executor::new(),
semaphore: Semaphore::new(max).into(),
}
}
/// Spawn a task, waiting until there is a slot available.
async fn spawn<F: Future + Send + 'static>(&self, future: F) -> Task<F::Output>
where
F::Output: Send + 'static,
{
// Wait for a semaphore permit.
let permit = self.semaphore.acquire_arc().await;
// Wrap it into a new future.
let future = async move {
let result = future.await;
drop(permit);
result
};
// Spawn the task.
self.executor.spawn(future)
}
/// Run a future to completion.
async fn run<F: Future>(&self, future: F) -> F::Output {
self.executor.run(future).await
}
}
fn main() {
futures_lite::future::block_on(async {
let ex = Arc::new(LimitedExecutor::new(10));
ex.run({
let ex = ex.clone();
async move {
// Spawn a bunch of tasks that wait for a while.
for i in 0..15 {
ex.spawn(async move {
async_io::Timer::after(Duration::from_millis(fastrand::u64(1..3))).await;
println!("Waiting task #{i} finished!");
})
.await
.detach();
}
let (start_tx, start_rx) = async_channel::bounded::<()>(1);
let mut current_rx = start_rx;
// Send the first message.
start_tx.send(()).await.unwrap();
// Spawn a bunch of channel tasks that wake eachother up.
for i in 0..25 {
let (next_tx, next_rx) = async_channel::bounded::<()>(1);
ex.spawn(async move {
current_rx.recv().await.unwrap();
println!("Channel task {i} woken up!");
next_tx.send(()).await.unwrap();
println!("Channel task {i} finished!");
})
.await
.detach();
current_rx = next_rx;
}
// Wait for the last task to finish.
current_rx.recv().await.unwrap();
println!("All tasks finished!");
}
})
.await;
});
}

84
vendor/async-executor/examples/priority.rs vendored Normal file
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//! An executor with task priorities.
use std::thread;
use async_executor::{Executor, Task};
use futures_lite::{future, prelude::*};
/// Task priority.
#[repr(usize)]
#[derive(Debug, Clone, Copy)]
enum Priority {
High = 0,
Medium = 1,
Low = 2,
}
/// An executor with task priorities.
///
/// Tasks with lower priorities only get polled when there are no tasks with higher priorities.
struct PriorityExecutor<'a> {
ex: [Executor<'a>; 3],
}
impl<'a> PriorityExecutor<'a> {
/// Creates a new executor.
const fn new() -> PriorityExecutor<'a> {
PriorityExecutor {
ex: [Executor::new(), Executor::new(), Executor::new()],
}
}
/// Spawns a task with the given priority.
fn spawn<T: Send + 'a>(
&self,
priority: Priority,
future: impl Future<Output = T> + Send + 'a,
) -> Task<T> {
self.ex[priority as usize].spawn(future)
}
/// Runs the executor forever.
async fn run(&self) {
loop {
for _ in 0..200 {
let t0 = self.ex[0].tick();
let t1 = self.ex[1].tick();
let t2 = self.ex[2].tick();
// Wait until one of the ticks completes, trying them in order from highest
// priority to lowest priority.
t0.or(t1).or(t2).await;
}
// Yield every now and then.
future::yield_now().await;
}
}
}
fn main() {
static EX: PriorityExecutor<'_> = PriorityExecutor::new();
// Spawn a thread running the executor forever.
thread::spawn(|| future::block_on(EX.run()));
let mut tasks = Vec::new();
for _ in 0..20 {
// Choose a random priority.
let choice = [Priority::High, Priority::Medium, Priority::Low];
let priority = choice[fastrand::usize(..choice.len())];
// Spawn a task with this priority.
tasks.push(EX.spawn(priority, async move {
println!("{priority:?}");
future::yield_now().await;
println!("{priority:?}");
}));
}
for task in tasks {
future::block_on(task);
}
}

1237
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484
vendor/async-executor/src/static_executors.rs vendored Normal file
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use crate::{debug_state, Executor, LocalExecutor, State};
use async_task::{Builder, Runnable, Task};
use slab::Slab;
use std::{
cell::UnsafeCell,
fmt,
future::Future,
marker::PhantomData,
panic::{RefUnwindSafe, UnwindSafe},
sync::PoisonError,
};
impl Executor<'static> {
/// Consumes the [`Executor`] and intentionally leaks it.
///
/// Largely equivalent to calling `Box::leak(Box::new(executor))`, but the produced
/// [`StaticExecutor`]'s functions are optimized to require fewer synchronizing operations
/// when spawning, running, and finishing tasks.
///
/// `StaticExecutor` cannot be converted back into a `Executor`, so this operation is
/// irreversible without the use of unsafe.
///
/// # Example
///
/// ```
/// use async_executor::Executor;
/// use futures_lite::future;
///
/// let ex = Executor::new().leak();
///
/// let task = ex.spawn(async {
/// println!("Hello world");
/// });
///
/// future::block_on(ex.run(task));
/// ```
pub fn leak(self) -> &'static StaticExecutor {
let ptr = self.state_ptr();
// SAFETY: So long as an Executor lives, it's state pointer will always be valid
// when accessed through state_ptr. This executor will live for the full 'static
// lifetime so this isn't an arbitrary lifetime extension.
let state: &'static State = unsafe { &*ptr };
std::mem::forget(self);
let mut active = state.active.lock().unwrap_or_else(PoisonError::into_inner);
if !active.is_empty() {
// Reschedule all of the active tasks.
for waker in active.drain() {
waker.wake();
}
// Overwrite to ensure that the slab is deallocated.
*active = Slab::new();
}
// SAFETY: StaticExecutor has the same memory layout as State as it's repr(transparent).
// The lifetime is not altered: 'static -> 'static.
let static_executor: &'static StaticExecutor = unsafe { std::mem::transmute(state) };
static_executor
}
}
impl LocalExecutor<'static> {
/// Consumes the [`LocalExecutor`] and intentionally leaks it.
///
/// Largely equivalent to calling `Box::leak(Box::new(executor))`, but the produced
/// [`StaticLocalExecutor`]'s functions are optimized to require fewer synchronizing operations
/// when spawning, running, and finishing tasks.
///
/// `StaticLocalExecutor` cannot be converted back into a `Executor`, so this operation is
/// irreversible without the use of unsafe.
///
/// # Example
///
/// ```
/// use async_executor::LocalExecutor;
/// use futures_lite::future;
///
/// let ex = LocalExecutor::new().leak();
///
/// let task = ex.spawn(async {
/// println!("Hello world");
/// });
///
/// future::block_on(ex.run(task));
/// ```
pub fn leak(self) -> &'static StaticLocalExecutor {
let ptr = self.inner.state_ptr();
// SAFETY: So long as a LocalExecutor lives, it's state pointer will always be valid
// when accessed through state_ptr. This executor will live for the full 'static
// lifetime so this isn't an arbitrary lifetime extension.
let state: &'static State = unsafe { &*ptr };
std::mem::forget(self);
let mut active = state.active.lock().unwrap_or_else(PoisonError::into_inner);
if !active.is_empty() {
// Reschedule all of the active tasks.
for waker in active.drain() {
waker.wake();
}
// Overwrite to ensure that the slab is deallocated.
*active = Slab::new();
}
// SAFETY: StaticLocalExecutor has the same memory layout as State as it's repr(transparent).
// The lifetime is not altered: 'static -> 'static.
let static_executor: &'static StaticLocalExecutor = unsafe { std::mem::transmute(state) };
static_executor
}
}
/// A static-lifetimed async [`Executor`].
///
/// This is primarily intended to be used in [`static`] variables, or types intended to be used, or can be created in non-static
/// contexts via [`Executor::leak`].
///
/// Spawning, running, and finishing tasks are optimized with the assumption that the executor will never be `Drop`'ed.
/// A static executor may require signficantly less overhead in both single-threaded and mulitthreaded use cases.
///
/// As this type does not implement `Drop`, losing the handle to the executor or failing
/// to consistently drive the executor with [`StaticExecutor::tick`] or
/// [`StaticExecutor::run`] will cause the all spawned tasks to permanently leak. Any
/// tasks at the time will not be cancelled.
///
/// [`static`]: https://doc.rust-lang.org/std/keyword.static.html
#[repr(transparent)]
pub struct StaticExecutor {
state: State,
}
// SAFETY: Executor stores no thread local state that can be accessed via other thread.
unsafe impl Send for StaticExecutor {}
// SAFETY: Executor internally synchronizes all of it's operations internally.
unsafe impl Sync for StaticExecutor {}
impl UnwindSafe for StaticExecutor {}
impl RefUnwindSafe for StaticExecutor {}
impl fmt::Debug for StaticExecutor {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
debug_state(&self.state, "StaticExecutor", f)
}
}
impl StaticExecutor {
/// Creates a new StaticExecutor.
///
/// # Examples
///
/// ```
/// use async_executor::StaticExecutor;
///
/// static EXECUTOR: StaticExecutor = StaticExecutor::new();
/// ```
pub const fn new() -> Self {
Self {
state: State::new(),
}
}
/// Spawns a task onto the executor.
///
/// Note: unlike [`Executor::spawn`], this function requires being called with a `'static`
/// borrow on the executor.
///
/// # Examples
///
/// ```
/// use async_executor::StaticExecutor;
///
/// static EXECUTOR: StaticExecutor = StaticExecutor::new();
///
/// let task = EXECUTOR.spawn(async {
/// println!("Hello world");
/// });
/// ```
pub fn spawn<T: Send + 'static>(
&'static self,
future: impl Future<Output = T> + Send + 'static,
) -> Task<T> {
let (runnable, task) = Builder::new()
.propagate_panic(true)
.spawn(|()| future, self.schedule());
runnable.schedule();
task
}
/// Spawns a non-`'static` task onto the executor.
///
/// ## Safety
///
/// The caller must ensure that the returned task terminates
/// or is cancelled before the end of 'a.
pub unsafe fn spawn_scoped<'a, T: Send + 'a>(
&'static self,
future: impl Future<Output = T> + Send + 'a,
) -> Task<T> {
// SAFETY:
//
// - `future` is `Send`
// - `future` is not `'static`, but the caller guarantees that the
// task, and thus its `Runnable` must not live longer than `'a`.
// - `self.schedule()` is `Send`, `Sync` and `'static`, as checked below.
// Therefore we do not need to worry about what is done with the
// `Waker`.
let (runnable, task) = unsafe {
Builder::new()
.propagate_panic(true)
.spawn_unchecked(|()| future, self.schedule())
};
runnable.schedule();
task
}
/// Attempts to run a task if at least one is scheduled.
///
/// Running a scheduled task means simply polling its future once.
///
/// # Examples
///
/// ```
/// use async_executor::StaticExecutor;
///
/// static EXECUTOR: StaticExecutor = StaticExecutor::new();
///
/// assert!(!EXECUTOR.try_tick()); // no tasks to run
///
/// let task = EXECUTOR.spawn(async {
/// println!("Hello world");
/// });
///
/// assert!(EXECUTOR.try_tick()); // a task was found
/// ```
pub fn try_tick(&self) -> bool {
self.state.try_tick()
}
/// Runs a single task.
///
/// Running a task means simply polling its future once.
///
/// If no tasks are scheduled when this method is called, it will wait until one is scheduled.
///
/// # Examples
///
/// ```
/// use async_executor::StaticExecutor;
/// use futures_lite::future;
///
/// static EXECUTOR: StaticExecutor = StaticExecutor::new();
///
/// let task = EXECUTOR.spawn(async {
/// println!("Hello world");
/// });
///
/// future::block_on(EXECUTOR.tick()); // runs the task
/// ```
pub async fn tick(&self) {
self.state.tick().await;
}
/// Runs the executor until the given future completes.
///
/// # Examples
///
/// ```
/// use async_executor::StaticExecutor;
/// use futures_lite::future;
///
/// static EXECUTOR: StaticExecutor = StaticExecutor::new();
///
/// let task = EXECUTOR.spawn(async { 1 + 2 });
/// let res = future::block_on(EXECUTOR.run(async { task.await * 2 }));
///
/// assert_eq!(res, 6);
/// ```
pub async fn run<T>(&self, future: impl Future<Output = T>) -> T {
self.state.run(future).await
}
/// Returns a function that schedules a runnable task when it gets woken up.
fn schedule(&'static self) -> impl Fn(Runnable) + Send + Sync + 'static {
let state: &'static State = &self.state;
// TODO: If possible, push into the current local queue and notify the ticker.
move |runnable| {
let result = state.queue.push(runnable);
debug_assert!(result.is_ok()); // Since we use unbounded queue, push will never fail.
state.notify();
}
}
}
impl Default for StaticExecutor {
fn default() -> Self {
Self::new()
}
}
/// A static async [`LocalExecutor`] created from [`LocalExecutor::leak`].
///
/// This is primarily intended to be used in [`thread_local`] variables, or can be created in non-static
/// contexts via [`LocalExecutor::leak`].
///
/// Spawning, running, and finishing tasks are optimized with the assumption that the executor will never be `Drop`'ed.
/// A static executor may require signficantly less overhead in both single-threaded and mulitthreaded use cases.
///
/// As this type does not implement `Drop`, losing the handle to the executor or failing
/// to consistently drive the executor with [`StaticLocalExecutor::tick`] or
/// [`StaticLocalExecutor::run`] will cause the all spawned tasks to permanently leak. Any
/// tasks at the time will not be cancelled.
///
/// [`thread_local]: https://doc.rust-lang.org/std/macro.thread_local.html
#[repr(transparent)]
pub struct StaticLocalExecutor {
state: State,
marker_: PhantomData<UnsafeCell<()>>,
}
impl UnwindSafe for StaticLocalExecutor {}
impl RefUnwindSafe for StaticLocalExecutor {}
impl fmt::Debug for StaticLocalExecutor {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
debug_state(&self.state, "StaticLocalExecutor", f)
}
}
impl StaticLocalExecutor {
/// Creates a new StaticLocalExecutor.
///
/// # Examples
///
/// ```
/// use async_executor::StaticLocalExecutor;
///
/// thread_local! {
/// static EXECUTOR: StaticLocalExecutor = StaticLocalExecutor::new();
/// }
/// ```
pub const fn new() -> Self {
Self {
state: State::new(),
marker_: PhantomData,
}
}
/// Spawns a task onto the executor.
///
/// Note: unlike [`LocalExecutor::spawn`], this function requires being called with a `'static`
/// borrow on the executor.
///
/// # Examples
///
/// ```
/// use async_executor::LocalExecutor;
///
/// let ex = LocalExecutor::new().leak();
///
/// let task = ex.spawn(async {
/// println!("Hello world");
/// });
/// ```
pub fn spawn<T: 'static>(&'static self, future: impl Future<Output = T> + 'static) -> Task<T> {
let (runnable, task) = Builder::new()
.propagate_panic(true)
.spawn_local(|()| future, self.schedule());
runnable.schedule();
task
}
/// Spawns a non-`'static` task onto the executor.
///
/// ## Safety
///
/// The caller must ensure that the returned task terminates
/// or is cancelled before the end of 'a.
pub unsafe fn spawn_scoped<'a, T: 'a>(
&'static self,
future: impl Future<Output = T> + 'a,
) -> Task<T> {
// SAFETY:
//
// - `future` is not `Send` but `StaticLocalExecutor` is `!Sync`,
// `try_tick`, `tick` and `run` can only be called from the origin
// thread of the `StaticLocalExecutor`. Similarly, `spawn_scoped` can only
// be called from the origin thread, ensuring that `future` and the executor
// share the same origin thread. The `Runnable` can be scheduled from other
// threads, but because of the above `Runnable` can only be called or
// dropped on the origin thread.
// - `future` is not `'static`, but the caller guarantees that the
// task, and thus its `Runnable` must not live longer than `'a`.
// - `self.schedule()` is `Send`, `Sync` and `'static`, as checked below.
// Therefore we do not need to worry about what is done with the
// `Waker`.
let (runnable, task) = unsafe {
Builder::new()
.propagate_panic(true)
.spawn_unchecked(|()| future, self.schedule())
};
runnable.schedule();
task
}
/// Attempts to run a task if at least one is scheduled.
///
/// Running a scheduled task means simply polling its future once.
///
/// # Examples
///
/// ```
/// use async_executor::LocalExecutor;
///
/// let ex = LocalExecutor::new().leak();
/// assert!(!ex.try_tick()); // no tasks to run
///
/// let task = ex.spawn(async {
/// println!("Hello world");
/// });
/// assert!(ex.try_tick()); // a task was found
/// ```
pub fn try_tick(&self) -> bool {
self.state.try_tick()
}
/// Runs a single task.
///
/// Running a task means simply polling its future once.
///
/// If no tasks are scheduled when this method is called, it will wait until one is scheduled.
///
/// # Examples
///
/// ```
/// use async_executor::LocalExecutor;
/// use futures_lite::future;
///
/// let ex = LocalExecutor::new().leak();
///
/// let task = ex.spawn(async {
/// println!("Hello world");
/// });
/// future::block_on(ex.tick()); // runs the task
/// ```
pub async fn tick(&self) {
self.state.tick().await;
}
/// Runs the executor until the given future completes.
///
/// # Examples
///
/// ```
/// use async_executor::LocalExecutor;
/// use futures_lite::future;
///
/// let ex = LocalExecutor::new().leak();
///
/// let task = ex.spawn(async { 1 + 2 });
/// let res = future::block_on(ex.run(async { task.await * 2 }));
///
/// assert_eq!(res, 6);
/// ```
pub async fn run<T>(&self, future: impl Future<Output = T>) -> T {
self.state.run(future).await
}
/// Returns a function that schedules a runnable task when it gets woken up.
fn schedule(&'static self) -> impl Fn(Runnable) + Send + Sync + 'static {
let state: &'static State = &self.state;
// TODO: If possible, push into the current local queue and notify the ticker.
move |runnable| {
let result = state.queue.push(runnable);
debug_assert!(result.is_ok()); // Since we use unbounded queue, push will never fail.
state.notify();
}
}
}
impl Default for StaticLocalExecutor {
fn default() -> Self {
Self::new()
}
}

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use async_executor::LocalExecutor;
use futures_lite::future::{block_on, pending, poll_once};
use futures_lite::pin;
use std::cell::Cell;
#[test]
fn shared_queue_slot() {
block_on(async {
let was_polled = Cell::new(false);
let future = async {
was_polled.set(true);
pending::<()>().await;
};
let ex1 = LocalExecutor::new();
let ex2 = LocalExecutor::new();
// Start the futures for running forever.
let (run1, run2) = (ex1.run(pending::<()>()), ex2.run(pending::<()>()));
pin!(run1);
pin!(run2);
assert!(poll_once(run1.as_mut()).await.is_none());
assert!(poll_once(run2.as_mut()).await.is_none());
// Spawn the future on executor one and then poll executor two.
ex1.spawn(future).detach();
assert!(poll_once(run2).await.is_none());
assert!(!was_polled.get());
// Poll the first one.
assert!(poll_once(run1).await.is_none());
assert!(was_polled.get());
});
}

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#[cfg(not(miri))]
use std::mem;
use std::panic::catch_unwind;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Mutex;
use std::task::{Poll, Waker};
use async_executor::{Executor, Task};
use futures_lite::future;
use once_cell::sync::Lazy;
#[test]
fn executor_cancels_everything() {
static DROP: AtomicUsize = AtomicUsize::new(0);
static WAKER: Lazy<Mutex<Option<Waker>>> = Lazy::new(Default::default);
let ex = Executor::new();
let task = ex.spawn(async {
let _guard = CallOnDrop(|| {
DROP.fetch_add(1, Ordering::SeqCst);
});
future::poll_fn(|cx| {
*WAKER.lock().unwrap() = Some(cx.waker().clone());
Poll::Pending::<()>
})
.await;
});
future::block_on(ex.tick());
assert!(WAKER.lock().unwrap().is_some());
assert_eq!(DROP.load(Ordering::SeqCst), 0);
drop(ex);
assert_eq!(DROP.load(Ordering::SeqCst), 1);
assert!(catch_unwind(|| future::block_on(task)).is_err());
assert_eq!(DROP.load(Ordering::SeqCst), 1);
}
#[cfg(not(miri))]
#[test]
fn leaked_executor_leaks_everything() {
static DROP: AtomicUsize = AtomicUsize::new(0);
static WAKER: Lazy<Mutex<Option<Waker>>> = Lazy::new(Default::default);
let ex = Executor::new();
let task = ex.spawn(async {
let _guard = CallOnDrop(|| {
DROP.fetch_add(1, Ordering::SeqCst);
});
future::poll_fn(|cx| {
*WAKER.lock().unwrap() = Some(cx.waker().clone());
Poll::Pending::<()>
})
.await;
});
future::block_on(ex.tick());
assert!(WAKER.lock().unwrap().is_some());
assert_eq!(DROP.load(Ordering::SeqCst), 0);
mem::forget(ex);
assert_eq!(DROP.load(Ordering::SeqCst), 0);
assert!(future::block_on(future::poll_once(task)).is_none());
assert_eq!(DROP.load(Ordering::SeqCst), 0);
}
#[test]
fn await_task_after_dropping_executor() {
let s: String = "hello".into();
let ex = Executor::new();
let task: Task<&str> = ex.spawn(async { &*s });
assert!(ex.try_tick());
drop(ex);
assert_eq!(future::block_on(task), "hello");
drop(s);
}
#[test]
fn drop_executor_and_then_drop_finished_task() {
static DROP: AtomicUsize = AtomicUsize::new(0);
let ex = Executor::new();
let task = ex.spawn(async {
CallOnDrop(|| {
DROP.fetch_add(1, Ordering::SeqCst);
})
});
assert!(ex.try_tick());
assert_eq!(DROP.load(Ordering::SeqCst), 0);
drop(ex);
assert_eq!(DROP.load(Ordering::SeqCst), 0);
drop(task);
assert_eq!(DROP.load(Ordering::SeqCst), 1);
}
#[test]
fn drop_finished_task_and_then_drop_executor() {
static DROP: AtomicUsize = AtomicUsize::new(0);
let ex = Executor::new();
let task = ex.spawn(async {
CallOnDrop(|| {
DROP.fetch_add(1, Ordering::SeqCst);
})
});
assert!(ex.try_tick());
assert_eq!(DROP.load(Ordering::SeqCst), 0);
drop(task);
assert_eq!(DROP.load(Ordering::SeqCst), 1);
drop(ex);
assert_eq!(DROP.load(Ordering::SeqCst), 1);
}
#[test]
fn iterator_panics_mid_run() {
let ex = Executor::new();
let panic = std::panic::catch_unwind(|| {
let mut handles = vec![];
ex.spawn_many(
(0..50).map(|i| if i == 25 { panic!() } else { future::ready(i) }),
&mut handles,
)
});
assert!(panic.is_err());
let task = ex.spawn(future::ready(0));
assert_eq!(future::block_on(ex.run(task)), 0);
}
struct CallOnDrop<F: Fn()>(F);
impl<F: Fn()> Drop for CallOnDrop<F> {
fn drop(&mut self) {
(self.0)();
}
}

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//! Test for larger tasks.
use async_executor::Executor;
use futures_lite::future::{self, block_on};
use futures_lite::prelude::*;
use std::sync::Arc;
use std::thread;
use std::time::Duration;
fn do_run<Fut: Future<Output = ()>>(mut f: impl FnMut(Arc<Executor<'static>>) -> Fut) {
// This should not run for longer than two minutes.
#[cfg(not(miri))]
let _stop_timeout = {
let (stop_timeout, stopper) = async_channel::bounded::<()>(1);
thread::spawn(move || {
block_on(async move {
let timeout = async {
async_io::Timer::after(Duration::from_secs(2 * 60)).await;
eprintln!("test timed out after 2m");
std::process::exit(1)
};
let _ = stopper.recv().or(timeout).await;
})
});
stop_timeout
};
let ex = Arc::new(Executor::new());
// Test 1: Use the `run` command.
block_on(ex.run(f(ex.clone())));
// Test 2: Loop on `tick`.
block_on(async {
let ticker = async {
loop {
ex.tick().await;
}
};
f(ex.clone()).or(ticker).await
});
// Test 3: Run on many threads.
thread::scope(|scope| {
let (_signal, shutdown) = async_channel::bounded::<()>(1);
for _ in 0..16 {
let shutdown = shutdown.clone();
let ex = &ex;
scope.spawn(move || block_on(ex.run(shutdown.recv())));
}
block_on(f(ex.clone()));
});
// Test 4: Tick loop on many threads.
thread::scope(|scope| {
let (_signal, shutdown) = async_channel::bounded::<()>(1);
for _ in 0..16 {
let shutdown = shutdown.clone();
let ex = &ex;
scope.spawn(move || {
block_on(async move {
let ticker = async {
loop {
ex.tick().await;
}
};
shutdown.recv().or(ticker).await
})
});
}
block_on(f(ex.clone()));
});
}
#[test]
fn smoke() {
do_run(|ex| async move { ex.spawn(async {}).await });
}
#[test]
fn yield_now() {
do_run(|ex| async move { ex.spawn(future::yield_now()).await })
}
#[test]
fn timer() {
do_run(|ex| async move {
ex.spawn(async_io::Timer::after(Duration::from_millis(5)))
.await;
})
}

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use async_executor::Executor;
use futures_lite::{future, pin};
#[test]
fn two_queues() {
future::block_on(async {
// Create an executor with two runners.
let ex = Executor::new();
let (run1, run2) = (
ex.run(future::pending::<()>()),
ex.run(future::pending::<()>()),
);
let mut run1 = Box::pin(run1);
pin!(run2);
// Poll them both.
assert!(future::poll_once(run1.as_mut()).await.is_none());
assert!(future::poll_once(run2.as_mut()).await.is_none());
// Drop the first one, which should leave the local queue in the `None` state.
drop(run1);
assert!(future::poll_once(run2.as_mut()).await.is_none());
});
}

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use async_executor::Executor;
use futures_lite::{future, prelude::*};
#[test]
fn test_panic_propagation() {
let ex = Executor::new();
let task = ex.spawn(async { panic!("should be caught by the task") });
// Running the executor should not panic.
assert!(ex.try_tick());
// Polling the task should.
assert!(future::block_on(task.catch_unwind()).is_err());
}

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use async_executor::{Executor, LocalExecutor};
use futures_lite::future;
#[cfg(not(miri))]
const READY_COUNT: usize = 50_000;
#[cfg(miri)]
const READY_COUNT: usize = 505;
#[test]
fn spawn_many() {
future::block_on(async {
let ex = Executor::new();
// Spawn a lot of tasks.
let mut tasks = vec![];
ex.spawn_many((0..READY_COUNT).map(future::ready), &mut tasks);
// Run all of the tasks in parallel.
ex.run(async move {
for (i, task) in tasks.into_iter().enumerate() {
assert_eq!(task.await, i);
}
})
.await;
});
}
#[test]
fn spawn_many_local() {
future::block_on(async {
let ex = LocalExecutor::new();
// Spawn a lot of tasks.
let mut tasks = vec![];
ex.spawn_many((0..READY_COUNT).map(future::ready), &mut tasks);
// Run all of the tasks in parallel.
ex.run(async move {
for (i, task) in tasks.into_iter().enumerate() {
assert_eq!(task.await, i);
}
})
.await;
});
}