diff options
Diffstat (limited to 'vendor/futures-task-0.3.14')
| -rw-r--r-- | vendor/futures-task-0.3.14/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/Cargo.toml | 35 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/LICENSE-APACHE | 202 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/LICENSE-MIT | 26 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/src/arc_wake.rs | 49 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/src/future_obj.rs | 344 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/src/lib.rs | 54 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/src/noop_waker.rs | 63 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/src/spawn.rs | 194 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/src/waker.rs | 61 | ||||
| -rw-r--r-- | vendor/futures-task-0.3.14/src/waker_ref.rs | 70 |
11 files changed, 1099 insertions, 0 deletions
diff --git a/vendor/futures-task-0.3.14/.cargo-checksum.json b/vendor/futures-task-0.3.14/.cargo-checksum.json new file mode 100644 index 00000000..98ac467b --- /dev/null +++ b/vendor/futures-task-0.3.14/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"f33ab9226268dad3db0cbabbd511b9fa8dbcaf775df76d9b108ef62c712009c4","LICENSE-APACHE":"275c491d6d1160553c32fd6127061d7f9606c3ea25abfad6ca3f6ed088785427","LICENSE-MIT":"6652c868f35dfe5e8ef636810a4e576b9d663f3a17fb0f5613ad73583e1b88fd","src/arc_wake.rs":"0e3f7d7883b75337b0b92ff55e477f0bf96f6eb08def7d953676a289fd9696ec","src/future_obj.rs":"761fdb79771d37c5ac7bf71188b1fee6a6c7456b490f3e6ad6891995f79ee5e9","src/lib.rs":"46f564d6df2cd89d3f9073d64c20ed15b0b8d196faed34cc718faf0ce640cba3","src/noop_waker.rs":"41246601dab77f69bf09257afc3321031a5a31a7eda51787029870eda9922356","src/spawn.rs":"37c7753e724d8346af5bb43462b1cf605e23bc5a3209feb2a6f33a018e9fa262","src/waker.rs":"fd951d3498739178c4b684ddb8d1a351b094bd300b52c1ccb0b9284affbcfed7","src/waker_ref.rs":"4189e2ad0ed1c1e73b374da6de448587bb39154efbd30b5c20ff92f95e91c3ad"},"package":"ba7aa51095076f3ba6d9a1f702f74bd05ec65f555d70d2033d55ba8d69f581bc"}
\ No newline at end of file diff --git a/vendor/futures-task-0.3.14/Cargo.toml b/vendor/futures-task-0.3.14/Cargo.toml new file mode 100644 index 00000000..6315429e --- /dev/null +++ b/vendor/futures-task-0.3.14/Cargo.toml @@ -0,0 +1,35 @@ +# 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 believe there's an error in this file please file an +# issue against the rust-lang/cargo repository. If you're +# editing this file be aware that the upstream Cargo.toml +# will likely look very different (and much more reasonable) + +[package] +edition = "2018" +name = "futures-task" +version = "0.3.14" +authors = ["Alex Crichton <alex@alexcrichton.com>"] +description = "Tools for working with tasks.\n" +homepage = "https://rust-lang.github.io/futures-rs" +documentation = "https://docs.rs/futures-task/0.3" +license = "MIT OR Apache-2.0" +repository = "https://github.com/rust-lang/futures-rs" +[package.metadata.docs.rs] +all-features = true + +[dependencies] + +[dev-dependencies] + +[features] +alloc = [] +cfg-target-has-atomic = [] +default = ["std"] +std = ["alloc"] +unstable = [] diff --git a/vendor/futures-task-0.3.14/LICENSE-APACHE b/vendor/futures-task-0.3.14/LICENSE-APACHE new file mode 100644 index 00000000..9eb0b097 --- /dev/null +++ b/vendor/futures-task-0.3.14/LICENSE-APACHE @@ -0,0 +1,202 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + +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 + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. diff --git a/vendor/futures-task-0.3.14/LICENSE-MIT b/vendor/futures-task-0.3.14/LICENSE-MIT new file mode 100644 index 00000000..8ad082ec --- /dev/null +++ b/vendor/futures-task-0.3.14/LICENSE-MIT @@ -0,0 +1,26 @@ +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 +PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT +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. diff --git a/vendor/futures-task-0.3.14/src/arc_wake.rs b/vendor/futures-task-0.3.14/src/arc_wake.rs new file mode 100644 index 00000000..aa6de0fc --- /dev/null +++ b/vendor/futures-task-0.3.14/src/arc_wake.rs @@ -0,0 +1,49 @@ +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>); +} diff --git a/vendor/futures-task-0.3.14/src/future_obj.rs b/vendor/futures-task-0.3.14/src/future_obj.rs new file mode 100644 index 00000000..373be244 --- /dev/null +++ b/vendor/futures-task-0.3.14/src/future_obj.rs @@ -0,0 +1,344 @@ +use core::{ + mem, + fmt, + future::Future, + marker::PhantomData, + 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) +{ + 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)) +{ + 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. + 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(Box::from_raw(ptr as *mut 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(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(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(mut self) -> *mut (dyn Future<Output = T> + 'a) { + let ptr = unsafe { self.as_mut().get_unchecked_mut() as *mut _ }; + mem::forget(self); + ptr + } + + unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) { + drop(Pin::from(Box::from_raw(ptr))) + } + } + + unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Pin<Box<dyn Future<Output = T> + 'a>> { + fn into_raw(mut self) -> *mut (dyn Future<Output = T> + 'a) { + let ptr = unsafe { self.as_mut().get_unchecked_mut() as *mut _ }; + mem::forget(self); + ptr + } + + unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) { + drop(Pin::from(Box::from_raw(ptr))) + } + } + + unsafe impl<'a, T: 'a> UnsafeFutureObj<'a, T> for Pin<Box<dyn Future<Output = T> + Send + 'a>> { + fn into_raw(mut self) -> *mut (dyn Future<Output = T> + 'a) { + let ptr = unsafe { self.as_mut().get_unchecked_mut() as *mut _ }; + mem::forget(self); + ptr + } + + unsafe fn drop(ptr: *mut (dyn Future<Output = T> + 'a)) { + drop(Pin::from(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) + } + } +} diff --git a/vendor/futures-task-0.3.14/src/lib.rs b/vendor/futures-task-0.3.14/src/lib.rs new file mode 100644 index 00000000..5505e3ad --- /dev/null +++ b/vendor/futures-task-0.3.14/src/lib.rs @@ -0,0 +1,54 @@ +//! Tools for working with tasks. + +#![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))] + +#![cfg_attr(not(feature = "std"), no_std)] + +#![warn(missing_docs, missing_debug_implementations, rust_2018_idioms, unreachable_pub)] +// It cannot be included in the published code because this lints have false positives in the minimum required version. +#![cfg_attr(test, warn(single_use_lifetimes))] +#![warn(clippy::all)] +#![doc(test(attr(deny(warnings), allow(dead_code, unused_assignments, unused_variables))))] + +#[cfg(all(feature = "cfg-target-has-atomic", not(feature = "unstable")))] +compile_error!("The `cfg-target-has-atomic` feature requires the `unstable` feature as an explicit opt-in to unstable features"); + +#[cfg(feature = "alloc")] +extern crate alloc; + +macro_rules! cfg_target_has_atomic { + ($($item:item)*) => {$( + #[cfg_attr(feature = "cfg-target-has-atomic", cfg(target_has_atomic = "ptr"))] + $item + )*}; +} + +mod spawn; +pub use crate::spawn::{Spawn, SpawnError, LocalSpawn}; + +cfg_target_has_atomic! { + #[cfg(feature = "alloc")] + mod arc_wake; + #[cfg(feature = "alloc")] + pub use crate::arc_wake::ArcWake; + + #[cfg(feature = "alloc")] + mod waker; + #[cfg(feature = "alloc")] + pub use crate::waker::waker; + + #[cfg(feature = "alloc")] + mod waker_ref; + #[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, Waker, RawWaker, RawWakerVTable}; diff --git a/vendor/futures-task-0.3.14/src/noop_waker.rs b/vendor/futures-task-0.3.14/src/noop_waker.rs new file mode 100644 index 00000000..f76a8a2e --- /dev/null +++ b/vendor/futures-task-0.3.14/src/noop_waker.rs @@ -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(); + } +} diff --git a/vendor/futures-task-0.3.14/src/spawn.rs b/vendor/futures-task-0.3.14/src/spawn.rs new file mode 100644 index 00000000..a515dd4e --- /dev/null +++ b/vendor/futures-task-0.3.14/src/spawn.rs @@ -0,0 +1,194 |