diff options
Diffstat (limited to 'rust')
-rw-r--r-- | rust/kernel/lib.rs | 1 | ||||
-rw-r--r-- | rust/kernel/sync/arc.rs | 20 |
2 files changed, 19 insertions, 2 deletions
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index 4bde65e7b06b..e0b0e953907d 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -15,6 +15,7 @@ #![feature(allocator_api)] #![feature(coerce_unsized)] #![feature(core_ffi_c)] +#![feature(dispatch_from_dyn)] #![feature(receiver_trait)] #![feature(unsize)] diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs index 832bafc74a90..ff73f9240ca1 100644 --- a/rust/kernel/sync/arc.rs +++ b/rust/kernel/sync/arc.rs @@ -92,9 +92,15 @@ use core::{ /// Coercion from `Arc<Example>` to `Arc<dyn MyTrait>`: /// /// ``` -/// use kernel::sync::Arc; +/// use kernel::sync::{Arc, ArcBorrow}; +/// +/// trait MyTrait { +/// // Trait has a function whose `self` type is `Arc<Self>`. +/// fn example1(self: Arc<Self>) {} /// -/// trait MyTrait {} +/// // Trait has a function whose `self` type is `ArcBorrow<'_, Self>`. +/// fn example2(self: ArcBorrow<'_, Self>) {} +/// } /// /// struct Example; /// impl MyTrait for Example {} @@ -123,6 +129,9 @@ impl<T: ?Sized> core::ops::Receiver for Arc<T> {} // dynamically-sized type (DST) `U`. impl<T: ?Sized + Unsize<U>, U: ?Sized> core::ops::CoerceUnsized<Arc<U>> for Arc<T> {} +// This is to allow `Arc<U>` to be dispatched on when `Arc<T>` can be coerced into `Arc<U>`. +impl<T: ?Sized + Unsize<U>, U: ?Sized> core::ops::DispatchFromDyn<Arc<U>> for Arc<T> {} + // SAFETY: It is safe to send `Arc<T>` to another thread when the underlying `T` is `Sync` because // it effectively means sharing `&T` (which is safe because `T` is `Sync`); additionally, it needs // `T` to be `Send` because any thread that has an `Arc<T>` may ultimately access `T` directly, for @@ -297,6 +306,13 @@ pub struct ArcBorrow<'a, T: ?Sized + 'a> { // This is to allow [`ArcBorrow`] (and variants) to be used as the type of `self`. impl<T: ?Sized> core::ops::Receiver for ArcBorrow<'_, T> {} +// This is to allow `ArcBorrow<U>` to be dispatched on when `ArcBorrow<T>` can be coerced into +// `ArcBorrow<U>`. +impl<T: ?Sized + Unsize<U>, U: ?Sized> core::ops::DispatchFromDyn<ArcBorrow<'_, U>> + for ArcBorrow<'_, T> +{ +} + impl<T: ?Sized> Clone for ArcBorrow<'_, T> { fn clone(&self) -> Self { *self |