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Do not bound callbacks by Send when building for no-std

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`Send` is rather useless on a `no-std` target - we don't have
threads and are just needlessly restricting ourselves, so here we
skip it for the wakers callback.
This commit is contained in:
Matt Corallo 2023-03-15 17:43:29 +00:00
parent a1b5a1bba3
commit 328407351c
1 changed files with 9 additions and 2 deletions
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11
lightning/src/util/wakers.rs
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@ -137,6 +137,7 @@ impl Notifier {
} }
} }
macro_rules! define_callback { ($($bounds: path),*) => {
/// A callback which is called when a [`Future`] completes. /// A callback which is called when a [`Future`] completes.
/// ///
/// Note that this MUST NOT call back into LDK directly, it must instead schedule actions to be /// Note that this MUST NOT call back into LDK directly, it must instead schedule actions to be
@ -145,14 +146,20 @@ impl Notifier {
/// ///
/// Note that the [`std::future::Future`] implementation may only work for runtimes which schedule /// Note that the [`std::future::Future`] implementation may only work for runtimes which schedule
/// futures when they receive a wake, rather than immediately executing them. /// futures when they receive a wake, rather than immediately executing them.
pub trait FutureCallback : Send { pub trait FutureCallback : $($bounds +)* {
/// The method which is called. /// The method which is called.
fn call(&self); fn call(&self);
} }
impl<F: Fn() + Send> FutureCallback for F { impl<F: Fn() $(+ $bounds)*> FutureCallback for F {
fn call(&self) { (self)(); } fn call(&self) { (self)(); }
} }
} }
#[cfg(feature = "std")]
define_callback!(Send);
#[cfg(not(feature = "std"))]
define_callback!();
pub(crate) struct FutureState { pub(crate) struct FutureState {
// When we're tracking whether a callback counts as having woken the user's code, we check the // When we're tracking whether a callback counts as having woken the user's code, we check the