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notes-service/vendor/futures-task/.cargo-checksum.json
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{"$comment":"This file only protects against accidental modifications. It is not a security mechanism and does not protect against malicious changes.","files":{".cargo_vcs_info.json":"774f8cbeb9f4754f7298025ec31e60909231ebce7672bac1b1aea0522e7ee173","Cargo.lock":"e9fea1dfacb69c306bbc4d63d664dcfe2bfdd83c490cc41211434cacdf1fa9aa","Cargo.toml":"b3e3267fa99c0a76f076428a9242cc2898350ba355f5ae55a924dbd81bb08955","Cargo.toml.orig":"7a36709e56b6a1d766c01e95f751b67a1cc71ab8670ddd235e4991707df6dab2","LICENSE-APACHE":"275c491d6d1160553c32fd6127061d7f9606c3ea25abfad6ca3f6ed088785427","LICENSE-MIT":"6652c868f35dfe5e8ef636810a4e576b9d663f3a17fb0f5613ad73583e1b88fd","README.md":"7a458e69ff008c35cffbbbcd2a14ad3ba7ad75201ce74df2d8f8d0fdcf6c4a89","src/arc_wake.rs":"0e3f7d7883b75337b0b92ff55e477f0bf96f6eb08def7d953676a289fd9696ec","src/future_obj.rs":"be75a5b6f124cd25038c60961b5933062a06ccdce569e58e41c357802d3d1891","src/lib.rs":"dbaf4498e6583bd4703733f8fd8b6f51fa5cb6f32940fa0ab7692df48a45e2b7","src/noop_waker.rs":"41246601dab77f69bf09257afc3321031a5a31a7eda51787029870eda9922356","src/spawn.rs":"36b73e1d2d8e3cfbbd0854b664bd00e62d70d8b7255d83724ddde08b9ec688dc","src/waker.rs":"3fd071a6e951d873aa896b3ee7b377a70d340e738a51aef85f5bb1c46d3451a8","src/waker_ref.rs":"640264ad52ccd2ebbb650104eaab9a2d24b8d08749f8c76226bd22bd51006f2a"},"package":"b231ed28831efb4a61a08580c4bc233ec56bc009f4cd8f52da2c3cb97df0c109"}
notes-service/vendor/futures-task/.cargo_vcs_info.json
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{
"git": {
"sha1": "89cc254cb8bfcc78e6a31e7711d0757f97bcb531"
},
"path_in_vcs": "futures-task"
}
notes-service/vendor/futures-task/Cargo.lock
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "futures-task"
version = "0.3.33"
notes-service/vendor/futures-task/Cargo.toml
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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 = "2018"
rust-version = "1.71"
name = "futures-task"
version = "0.3.33"
build = false
autolib = false
autobins = false
autoexamples = false
autotests = false
autobenches = false
description = """
Tools for working with tasks.
"""
homepage = "https://rust-lang.github.io/futures-rs"
readme = "README.md"
license = "MIT OR Apache-2.0"
repository = "https://github.com/rust-lang/futures-rs"
[package.metadata.docs.rs]
all-features = true
[features]
alloc = []
cfg-target-has-atomic = []
default = ["std"]
std = ["alloc"]
unstable = []
[lib]
name = "futures_task"
path = "src/lib.rs"
[dependencies]
[dev-dependencies]
[lints.rust]
missing_debug_implementations = "warn"
rust_2018_idioms = "warn"
single_use_lifetimes = "warn"
unreachable_pub = "warn"
[lints.rust.unexpected_cfgs]
level = "warn"
priority = 0
check-cfg = ["cfg(futures_sanitizer)"]
notes-service/vendor/futures-task/Cargo.toml.orig
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[package]
name = "futures-task"
version = "0.3.33"
edition = "2018"
# NB: Sync with "Usage" section in README.md and util-msrv job in .github/workflows/ci.yml
rust-version = "1.71"
license = "MIT OR Apache-2.0"
repository = "https://github.com/rust-lang/futures-rs"
homepage = "https://rust-lang.github.io/futures-rs"
description = """
Tools for working with tasks.
"""
[features]
default = ["std"]
std = ["alloc"]
alloc = []
# These features are no longer used.
# TODO: remove in the next major version.
unstable = []
cfg-target-has-atomic = []
[dependencies]
[dev-dependencies]
futures = { path = "../futures" }
[package.metadata.docs.rs]
all-features = true
[lints]
workspace = true
notes-service/vendor/futures-task/LICENSE-APACHE
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Apache License
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http://www.apache.org/licenses/
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Copyright (c) 2016 Alex Crichton
Copyright (c) 2017 The Tokio Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
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notes-service/vendor/futures-task/LICENSE-MIT
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Copyright (c) 2016 Alex Crichton
Copyright (c) 2017 The Tokio Authors
Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
notes-service/vendor/futures-task/README.md
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# futures-task
Tools for working with tasks.
## Usage
Add this to your `Cargo.toml`:
```toml
[dependencies]
futures-task = "0.3"
```
The current `futures-task` requires Rust 1.71 or later.
## License
Licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or
[MIT license](LICENSE-MIT) at your option.
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.
notes-service/vendor/futures-task/src/arc_wake.rs
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use alloc::sync::Arc;
/// A way of waking up a specific task.
///
/// By implementing this trait, types that are expected to be wrapped in an `Arc`
/// can be converted into [`Waker`] objects.
/// Those Wakers can be used to signal executors that a task it owns
/// is ready to be `poll`ed again.
///
/// Currently, there are two ways to convert `ArcWake` into [`Waker`]:
///
/// * [`waker`](super::waker()) converts `Arc<impl ArcWake>` into [`Waker`].
/// * [`waker_ref`](super::waker_ref()) converts `&Arc<impl ArcWake>` into [`WakerRef`] that
/// provides access to a [`&Waker`][`Waker`].
///
/// [`Waker`]: std::task::Waker
/// [`WakerRef`]: super::WakerRef
// Note: Send + Sync required because `Arc<T>` doesn't automatically imply
// those bounds, but `Waker` implements them.
pub trait ArcWake: Send + Sync {
/// Indicates that the associated task is ready to make progress and should
/// be `poll`ed.
///
/// This function can be called from an arbitrary thread, including threads which
/// did not create the `ArcWake` based [`Waker`].
///
/// Executors generally maintain a queue of "ready" tasks; `wake` should place
/// the associated task onto this queue.
///
/// [`Waker`]: std::task::Waker
fn wake(self: Arc<Self>) {
Self::wake_by_ref(&self)
}
/// Indicates that the associated task is ready to make progress and should
/// be `poll`ed.
///
/// This function can be called from an arbitrary thread, including threads which
/// did not create the `ArcWake` based [`Waker`].
///
/// Executors generally maintain a queue of "ready" tasks; `wake_by_ref` should place
/// the associated task onto this queue.
///
/// This function is similar to [`wake`](ArcWake::wake), but must not consume the provided data
/// pointer.
///
/// [`Waker`]: std::task::Waker
fn wake_by_ref(arc_self: &Arc<Self>);
}
notes-service/vendor/futures-task/src/future_obj.rs
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use core::{
fmt,
future::Future,
marker::PhantomData,
mem,
pin::Pin,
task::{Context, Poll},
};
/// A custom trait object for polling futures, roughly akin to
/// `Box<dyn Future<Output = T> + 'a>`.
///
/// This custom trait object was introduced as currently it is not possible to
/// take `dyn Trait` by value and `Box<dyn Trait>` is not available in no_std
/// contexts.
pub struct LocalFutureObj<'a, T> {
future: *mut (dyn Future<Output = T> + 'static),
drop_fn: unsafe fn(*mut (dyn Future<Output = T> + 'static)),
_marker: PhantomData<&'a ()>,
}
// As LocalFutureObj only holds pointers, even if we move it, the pointed to values won't move,
// so this is safe as long as we don't provide any way for a user to directly access the pointers
// and move their values.
impl<T> Unpin for LocalFutureObj<'_, T> {}
#[allow(single_use_lifetimes)]
#[allow(clippy::transmute_ptr_to_ptr)]
unsafe fn remove_future_lifetime<'a, T>(
ptr: *mut (dyn Future<Output = T> + 'a),
) -> *mut (dyn Future<Output = T> + 'static) {
unsafe { mem::transmute(ptr) }
}
#[allow(single_use_lifetimes)]
unsafe fn remove_drop_lifetime<'a, T>(
ptr: unsafe fn(*mut (dyn Future<Output = T> + 'a)),
) -> unsafe fn(*mut (dyn Future<Output = T> + 'static)) {
unsafe { mem::transmute(ptr) }
}
impl<'a, T> LocalFutureObj<'a, T> {
/// Create a `LocalFutureObj` from a custom trait object representation.
#[inline]
pub fn new<F: UnsafeFutureObj<'a, T> + 'a>(f: F) -> Self {
Self {
future: unsafe { remove_future_lifetime(f.into_raw()) },
drop_fn: unsafe { remove_drop_lifetime(F::drop) },
_marker: PhantomData,
}
}
/// Converts the `LocalFutureObj` into a `FutureObj`.
///
/// # Safety
///
/// To make this operation safe one has to ensure that the `UnsafeFutureObj`
/// instance from which this `LocalFutureObj` was created actually
/// implements `Send`.
#[inline]
pub unsafe fn into_future_obj(self) -> FutureObj<'a, T> {
FutureObj(self)
}
}
impl<T> fmt::Debug for LocalFutureObj<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("LocalFutureObj").finish()
}
}
impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T> {
#[inline]
fn from(f: FutureObj<'a, T>) -> Self {
f.0
}
}
impl<T> Future for LocalFutureObj<'_, T> {
type Output = T;
#[inline]
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
unsafe { Pin::new_unchecked(&mut *self.future).poll(cx) }
}
}
impl<T> Drop for LocalFutureObj<'_, T> {
fn drop(&mut self) {
unsafe { (self.drop_fn)(self.future) }
}
}
/// A custom trait object for polling futures, roughly akin to
/// `Box<dyn Future<Output = T> + Send + 'a>`.
///
/// This custom trait object was introduced as currently it is not possible to
/// take `dyn Trait` by value and `Box<dyn Trait>` is not available in no_std
/// contexts.
///
/// You should generally not need to use this type outside of `no_std` or when
/// implementing `Spawn`, consider using `BoxFuture` instead.
pub struct FutureObj<'a, T>(LocalFutureObj<'a, T>);
impl<T> Unpin for FutureObj<'_, T> {}
unsafe impl<T> Send for FutureObj<'_, T> {}
impl<'a, T> FutureObj<'a, T> {
/// Create a `FutureObj` from a custom trait object representation.
#[inline]
pub fn new<F: UnsafeFutureObj<'a, T> + Send>(f: F) -> Self {
Self(LocalFutureObj::new(f))
}
}
impl<T> fmt::Debug for FutureObj<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("FutureObj").finish()
}
}
impl<T> Future for FutureObj<'_, T> {
type Output = T;
#[inline]
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
Pin::new(&mut self.0).poll(cx)
}
}
/// A custom implementation of a future trait object for `FutureObj`, providing
/// a vtable with drop support.
///
/// This custom representation is typically used only in `no_std` contexts,
/// where the default `Box`-based implementation is not available.
///
/// # Safety
///
/// See the safety notes on individual methods for what guarantees an
/// implementor must provide.
pub unsafe trait UnsafeFutureObj<'a, T>: 'a {
/// Convert an owned instance into a (conceptually owned) fat pointer.
///
/// # Safety
///
/// ## Implementor
///
/// The trait implementor must guarantee that it is safe to convert the
/// provided `*mut (dyn Future<Output = T> + 'a)` into a `Pin<&mut (dyn
/// Future<Output = T> + 'a)>` and call methods on it, non-reentrantly,
/// until `UnsafeFutureObj::drop` is called with it.
#[allow(clippy::unnecessary_safety_doc)]
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a);
/// Drops the future represented by the given fat pointer.
///
/// # Safety
///
/// ## Implementor
///
/// The trait implementor must guarantee that it is safe to call this
/// function once per `into_raw` invocation.
///
/// ## Caller
///
/// The caller must ensure:
///
/// * the pointer passed was obtained from an `into_raw` invocation from
/// this same trait object
/// * the pointer is not currently in use as a `Pin<&mut (dyn Future<Output
/// = T> + 'a)>`
/// * the pointer must not be used again after this function is called
unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a));
}
unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for &'a mut F
where
F: Future<Output = T> + Unpin + 'a,
{
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
self as *mut dyn Future<Output = T>
}
unsafe fn drop(_ptr: *mut (dyn Future<Output = T> + 'a)) {}
}
unsafe impl<'a, T> UnsafeFutureObj<'a, T> for &'a mut (dyn Future<Output = T> + Unpin + 'a) {
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
self as *mut dyn Future<Output = T>
}
unsafe fn drop(_ptr: *mut (dyn Future<Output = T> + 'a)) {}
}
unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for Pin<&'a mut F>
where
F: Future<Output = T> + 'a,
{
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
unsafe { self.get_unchecked_mut() as *mut dyn Future<Output = T> }
}
unsafe fn drop(_ptr: *mut (dyn Future<Output = T> + 'a)) {}
}
unsafe impl<'a, T> UnsafeFutureObj<'a, T> for Pin<&'a mut (dyn Future<Output = T> + 'a)> {
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
unsafe { self.get_unchecked_mut() as *mut dyn Future<Output = T> }
}
unsafe fn drop(_ptr: *mut (dyn Future<Output = T> + 'a)) {}
}
#[cfg(feature = "alloc")]
mod if_alloc {
use super::*;
use alloc::boxed::Box;
unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for Box<F>
where
F: Future<Output = T> + 'a,
{
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
Box::into_raw(self)
}
unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
drop(unsafe { Box::from_raw(ptr.cast::<F>()) })
}
}
unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Box<dyn Future<Output = T> + 'a> {
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
Box::into_raw(self)
}
unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
drop(unsafe { Box::from_raw(ptr) })
}
}
unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Box<dyn Future<Output = T> + Send + 'a> {
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
Box::into_raw(self)
}
unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
drop(unsafe { Box::from_raw(ptr) })
}
}
unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for Pin<Box<F>>
where
F: Future<Output = T> + 'a,
{
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
let mut this = mem::ManuallyDrop::new(self);
unsafe { this.as_mut().get_unchecked_mut() as *mut _ }
}
unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
drop(Pin::from(unsafe { Box::from_raw(ptr) }))
}
}
unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Pin<Box<dyn Future<Output = T> + 'a>> {
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
let mut this = mem::ManuallyDrop::new(self);
unsafe { this.as_mut().get_unchecked_mut() as *mut _ }
}
unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
drop(Pin::from(unsafe { Box::from_raw(ptr) }))
}
}
unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Pin<Box<dyn Future<Output = T> + Send + 'a>> {
fn into_raw(self) -> *mut (dyn Future<Output = T> + 'a) {
let mut this = mem::ManuallyDrop::new(self);
unsafe { this.as_mut().get_unchecked_mut() as *mut _ }
}
unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) {
drop(Pin::from(unsafe { Box::from_raw(ptr) }))
}
}
impl<'a, F: Future<Output = ()> + Send + 'a> From<Box<F>> for FutureObj<'a, ()> {
fn from(boxed: Box<F>) -> Self {
Self::new(boxed)
}
}
impl<'a> From<Box<dyn Future<Output = ()> + Send + 'a>> for FutureObj<'a, ()> {
fn from(boxed: Box<dyn Future<Output = ()> + Send + 'a>) -> Self {
Self::new(boxed)
}
}
impl<'a, F: Future<Output = ()> + Send + 'a> From<Pin<Box<F>>> for FutureObj<'a, ()> {
fn from(boxed: Pin<Box<F>>) -> Self {
Self::new(boxed)
}
}
impl<'a> From<Pin<Box<dyn Future<Output = ()> + Send + 'a>>> for FutureObj<'a, ()> {
fn from(boxed: Pin<Box<dyn Future<Output = ()> + Send + 'a>>) -> Self {
Self::new(boxed)
}
}
impl<'a, F: Future<Output = ()> + 'a> From<Box<F>> for LocalFutureObj<'a, ()> {
fn from(boxed: Box<F>) -> Self {
Self::new(boxed)
}
}
impl<'a> From<Box<dyn Future<Output = ()> + 'a>> for LocalFutureObj<'a, ()> {
fn from(boxed: Box<dyn Future<Output = ()> + 'a>) -> Self {
Self::new(boxed)
}
}
impl<'a, F: Future<Output = ()> + 'a> From<Pin<Box<F>>> for LocalFutureObj<'a, ()> {
fn from(boxed: Pin<Box<F>>) -> Self {
Self::new(boxed)
}
}
impl<'a> From<Pin<Box<dyn Future<Output = ()> + 'a>>> for LocalFutureObj<'a, ()> {
fn from(boxed: Pin<Box<dyn Future<Output = ()> + 'a>>) -> Self {
Self::new(boxed)
}
}
}
notes-service/vendor/futures-task/src/lib.rs
Vendored
+54
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//! Tools for working with tasks.
#![no_std]
#![doc(test(
no_crate_inject,
attr(
deny(warnings, rust_2018_idioms, single_use_lifetimes),
allow(dead_code, unused_assignments, unused_variables)
)
))]
#![warn(missing_docs, unsafe_op_in_unsafe_fn)]
#[cfg(feature = "alloc")]
extern crate alloc;
#[cfg(feature = "std")]
extern crate std;
mod spawn;
pub use crate::spawn::{LocalSpawn, Spawn, SpawnError};
#[cfg(target_has_atomic = "ptr")]
#[cfg(feature = "alloc")]
mod arc_wake;
#[cfg(target_has_atomic = "ptr")]
#[cfg(feature = "alloc")]
pub use crate::arc_wake::ArcWake;
#[cfg(target_has_atomic = "ptr")]
#[cfg(feature = "alloc")]
mod waker;
#[cfg(target_has_atomic = "ptr")]
#[cfg(feature = "alloc")]
pub use crate::waker::waker;
#[cfg(target_has_atomic = "ptr")]
#[cfg(feature = "alloc")]
mod waker_ref;
#[cfg(target_has_atomic = "ptr")]
#[cfg(feature = "alloc")]
pub use crate::waker_ref::{waker_ref, WakerRef};
mod future_obj;
pub use crate::future_obj::{FutureObj, LocalFutureObj, UnsafeFutureObj};
mod noop_waker;
pub use crate::noop_waker::noop_waker;
pub use crate::noop_waker::noop_waker_ref;
#[doc(no_inline)]
pub use core::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};
#[cfg(all(feature = "alloc", target_has_atomic = "ptr"))]
#[doc(no_inline)]
pub use alloc::task::Wake;
notes-service/vendor/futures-task/src/noop_waker.rs
Vendored
+63
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@@ -0,0 +1,63 @@
//! Utilities for creating zero-cost wakers that don't do anything.
use core::ptr::null;
use core::task::{RawWaker, RawWakerVTable, Waker};
unsafe fn noop_clone(_data: *const ()) -> RawWaker {
noop_raw_waker()
}
unsafe fn noop(_data: *const ()) {}
const NOOP_WAKER_VTABLE: RawWakerVTable = RawWakerVTable::new(noop_clone, noop, noop, noop);
const fn noop_raw_waker() -> RawWaker {
RawWaker::new(null(), &NOOP_WAKER_VTABLE)
}
/// Create a new [`Waker`] which does
/// nothing when `wake()` is called on it.
///
/// # Examples
///
/// ```
/// use futures::task::noop_waker;
/// let waker = noop_waker();
/// waker.wake();
/// ```
#[inline]
pub fn noop_waker() -> Waker {
// FIXME: Since 1.46.0 we can use transmute in consts, allowing this function to be const.
unsafe { Waker::from_raw(noop_raw_waker()) }
}
/// Get a static reference to a [`Waker`] which
/// does nothing when `wake()` is called on it.
///
/// # Examples
///
/// ```
/// use futures::task::noop_waker_ref;
/// let waker = noop_waker_ref();
/// waker.wake_by_ref();
/// ```
#[inline]
pub fn noop_waker_ref() -> &'static Waker {
struct SyncRawWaker(RawWaker);
unsafe impl Sync for SyncRawWaker {}
static NOOP_WAKER_INSTANCE: SyncRawWaker = SyncRawWaker(noop_raw_waker());
// SAFETY: `Waker` is #[repr(transparent)] over its `RawWaker`.
unsafe { &*(&NOOP_WAKER_INSTANCE.0 as *const RawWaker as *const Waker) }
}
#[cfg(test)]
mod tests {
#[test]
#[cfg(feature = "std")]
fn issue_2091_cross_thread_segfault() {
let waker = std::thread::spawn(super::noop_waker_ref).join().unwrap();
waker.wake_by_ref();
}
}
notes-service/vendor/futures-task/src/spawn.rs
Vendored
+192
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@@ -0,0 +1,192 @@
use crate::{FutureObj, LocalFutureObj};
use core::fmt;
/// The `Spawn` trait allows for pushing futures onto an executor that will
/// run them to completion.
pub trait Spawn {
/// Spawns a future that will be run to completion.
///
/// # Errors
///
/// The executor may be unable to spawn tasks. Spawn errors should
/// represent relatively rare scenarios, such as the executor
/// having been shut down so that it is no longer able to accept
/// tasks.
fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError>;
/// Determines whether the executor is able to spawn new tasks.
///
/// This method will return `Ok` when the executor is *likely*
/// (but not guaranteed) to accept a subsequent spawn attempt.
/// Likewise, an `Err` return means that `spawn` is likely, but
/// not guaranteed, to yield an error.
#[inline]
fn status(&self) -> Result<(), SpawnError> {
Ok(())
}
}
/// The `LocalSpawn` is similar to [`Spawn`], but allows spawning futures
/// that don't implement `Send`.
pub trait LocalSpawn {
/// Spawns a future that will be run to completion.
///
/// # Errors
///
/// The executor may be unable to spawn tasks. Spawn errors should
/// represent relatively rare scenarios, such as the executor
/// having been shut down so that it is no longer able to accept
/// tasks.
fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError>;
/// Determines whether the executor is able to spawn new tasks.
///
/// This method will return `Ok` when the executor is *likely*
/// (but not guaranteed) to accept a subsequent spawn attempt.
/// Likewise, an `Err` return means that `spawn` is likely, but
/// not guaranteed, to yield an error.
#[inline]
fn status_local(&self) -> Result<(), SpawnError> {
Ok(())
}
}
/// An error that occurred during spawning.
pub struct SpawnError {
_priv: (),
}
impl fmt::Debug for SpawnError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("SpawnError").field(&"shutdown").finish()
}
}
impl fmt::Display for SpawnError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Executor is shutdown")
}
}
#[cfg(feature = "std")]
impl std::error::Error for SpawnError {}
impl SpawnError {
/// Spawning failed because the executor has been shut down.
pub fn shutdown() -> Self {
Self { _priv: () }
}
/// Check whether spawning failed to the executor being shut down.
pub fn is_shutdown(&self) -> bool {
true
}
}
impl<Sp: ?Sized + Spawn> Spawn for &Sp {
fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
Sp::spawn_obj(self, future)
}
fn status(&self) -> Result<(), SpawnError> {
Sp::status(self)
}
}
impl<Sp: ?Sized + Spawn> Spawn for &mut Sp {
fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
Sp::spawn_obj(self, future)
}
fn status(&self) -> Result<(), SpawnError> {
Sp::status(self)
}
}
impl<Sp: ?Sized + LocalSpawn> LocalSpawn for &Sp {
fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError> {
Sp::spawn_local_obj(self, future)
}
fn status_local(&self) -> Result<(), SpawnError> {
Sp::status_local(self)
}
}
impl<Sp: ?Sized + LocalSpawn> LocalSpawn for &mut Sp {
fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError> {
Sp::spawn_local_obj(self, future)
}
fn status_local(&self) -> Result<(), SpawnError> {
Sp::status_local(self)
}
}
#[cfg(feature = "alloc")]
mod if_alloc {
use super::*;
use alloc::{boxed::Box, rc::Rc};
impl<Sp: ?Sized + Spawn> Spawn for Box<Sp> {
fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
(**self).spawn_obj(future)
}
fn status(&self) -> Result<(), SpawnError> {
(**self).status()
}
}
impl<Sp: ?Sized + LocalSpawn> LocalSpawn for Box<Sp> {
fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError> {
(**self).spawn_local_obj(future)
}
fn status_local(&self) -> Result<(), SpawnError> {
(**self).status_local()
}
}
impl<Sp: ?Sized + Spawn> Spawn for Rc<Sp> {
fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
(**self).spawn_obj(future)
}
fn status(&self) -> Result<(), SpawnError> {
(**self).status()
}
}
impl<Sp: ?Sized + LocalSpawn> LocalSpawn for Rc<Sp> {
fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError> {
(**self).spawn_local_obj(future)
}
fn status_local(&self) -> Result<(), SpawnError> {
(**self).status_local()
}
}
#[cfg(target_has_atomic = "ptr")]
impl<Sp: ?Sized + Spawn> Spawn for alloc::sync::Arc<Sp> {
fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError> {
(**self).spawn_obj(future)
}
fn status(&self) -> Result<(), SpawnError> {
(**self).status()
}
}
#[cfg(target_has_atomic = "ptr")]
impl<Sp: ?Sized + LocalSpawn> LocalSpawn for alloc::sync::Arc<Sp> {
fn spawn_local_obj(&self, future: LocalFutureObj<'static, ()>) -> Result<(), SpawnError> {
(**self).spawn_local_obj(future)
}
fn status_local(&self) -> Result<(), SpawnError> {
(**self).status_local()
}
}
}
notes-service/vendor/futures-task/src/waker.rs
Vendored
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use super::arc_wake::ArcWake;
use alloc::sync::Arc;
use core::mem;
use core::task::{RawWaker, RawWakerVTable, Waker};
pub(super) fn waker_vtable<W: ArcWake + 'static>() -> &'static RawWakerVTable {
&RawWakerVTable::new(
clone_arc_raw::<W>,
wake_arc_raw::<W>,
wake_by_ref_arc_raw::<W>,
drop_arc_raw::<W>,
)
}
/// Creates a [`Waker`] from an `Arc<impl ArcWake>`.
///
/// The returned [`Waker`] will call
/// [`ArcWake.wake()`](ArcWake::wake) if awoken.
pub fn waker<W>(wake: Arc<W>) -> Waker
where
W: ArcWake + 'static,
{
let ptr = Arc::into_raw(wake).cast::<()>();
unsafe { Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>())) }
}
// FIXME: panics on Arc::clone / refcount changes could wreak havoc on the
// code here. We should guard against this by aborting.
#[allow(clippy::redundant_clone)] // The clone here isn't actually redundant.
unsafe fn increase_refcount<T: ArcWake + 'static>(data: *const ()) {
// Retain Arc, but don't touch refcount by wrapping in ManuallyDrop
let arc = mem::ManuallyDrop::new(unsafe { Arc::<T>::from_raw(data.cast::<T>()) });
// Now increase refcount, but don't drop new refcount either
let _arc_clone: mem::ManuallyDrop<_> = arc.clone();
}
// used by `waker_ref`
#[inline(always)]
unsafe fn clone_arc_raw<T: ArcWake + 'static>(data: *const ()) -> RawWaker {
unsafe { increase_refcount::<T>(data) }
RawWaker::new(data, waker_vtable::<T>())
}
unsafe fn wake_arc_raw<T: ArcWake + 'static>(data: *const ()) {
let arc: Arc<T> = unsafe { Arc::from_raw(data.cast::<T>()) };
ArcWake::wake(arc);
}
// used by `waker_ref`
unsafe fn wake_by_ref_arc_raw<T: ArcWake + 'static>(data: *const ()) {
// Retain Arc, but don't touch refcount by wrapping in ManuallyDrop
let arc = mem::ManuallyDrop::new(unsafe { Arc::<T>::from_raw(data.cast::<T>()) });
ArcWake::wake_by_ref(&arc);
}
unsafe fn drop_arc_raw<T: ArcWake + 'static>(data: *const ()) {
drop(unsafe { Arc::<T>::from_raw(data.cast::<T>()) })
}
notes-service/vendor/futures-task/src/waker_ref.rs
Vendored
+66
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@@ -0,0 +1,66 @@
use super::arc_wake::ArcWake;
use super::waker::waker_vtable;
use alloc::sync::Arc;
use core::marker::PhantomData;
use core::mem::ManuallyDrop;
use core::ops::Deref;
use core::task::{RawWaker, Waker};
/// A [`Waker`] that is only valid for a given lifetime.
///
/// Note: this type implements [`Deref<Target = Waker>`](std::ops::Deref),
/// so it can be used to get a `&Waker`.
#[derive(Debug)]
pub struct WakerRef<'a> {
waker: ManuallyDrop<Waker>,
_marker: PhantomData<&'a ()>,
}
impl<'a> WakerRef<'a> {
/// Create a new [`WakerRef`] from a [`Waker`] reference.
#[inline]
pub fn new(waker: &'a Waker) -> Self {
// copy the underlying (raw) waker without calling a clone,
// as we won't call Waker::drop either.
let waker = ManuallyDrop::new(unsafe { core::ptr::read(waker) });
Self { waker, _marker: PhantomData }
}
/// Create a new [`WakerRef`] from a [`Waker`] that must not be dropped.
///
/// Note: this if for rare cases where the caller created a [`Waker`] in
/// an unsafe way (that will be valid only for a lifetime to be determined
/// by the caller), and the [`Waker`] doesn't need to or must not be
/// destroyed.
#[inline]
pub fn new_unowned(waker: ManuallyDrop<Waker>) -> Self {
Self { waker, _marker: PhantomData }
}
}
impl Deref for WakerRef<'_> {
type Target = Waker;
#[inline]
fn deref(&self) -> &Waker {
&self.waker
}
}
/// Creates a reference to a [`Waker`] from a reference to `Arc<impl ArcWake>`.
///
/// The resulting [`Waker`] will call
/// [`ArcWake.wake()`](ArcWake::wake) if awoken.
#[inline]
pub fn waker_ref<W>(wake: &Arc<W>) -> WakerRef<'_>
where
W: ArcWake + 'static,
{
// simply copy the pointer instead of using Arc::into_raw,
// as we don't actually keep a refcount by using ManuallyDrop.<
let ptr = Arc::as_ptr(wake).cast::<()>();
let waker =
ManuallyDrop::new(unsafe { Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>())) });
WakerRef::new_unowned(waker)
}