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| author | Alice Ryhl <aliceryhl@google.com> | 2023-05-31 14:59:36 +0000 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2023-05-31 18:53:10 +0200 |
| commit | f8110cd157833e721f50f779dc70f8ae5b429832 (patch) | |
| tree | b39047e404594da2afc8474aadfd84a2b307e17e /rust | |
| parent | 47329ba14b5aac1ac975544eee71ecc888557d23 (diff) | |
| download | lwn-f8110cd157833e721f50f779dc70f8ae5b429832.tar.gz lwn-f8110cd157833e721f50f779dc70f8ae5b429832.zip | |
rust: sync: reword the `Arc` safety comment for `Send`
The safety comment on `impl Send for Arc` talks about "directly"
accessing the value, when it really means "accessing the value with a
mutable reference". This commit clarifies that.
Suggested-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20230531145939.3714886-2-aliceryhl@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust')
| -rw-r--r-- | rust/kernel/sync/arc.rs | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs index ace478442998..a8c2177950cd 100644 --- a/rust/kernel/sync/arc.rs +++ b/rust/kernel/sync/arc.rs @@ -146,8 +146,8 @@ impl<T: ?Sized + Unsize<U>, U: ?Sized> core::ops::DispatchFromDyn<Arc<U>> for Ar // 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 -// example, when the reference count reaches zero and `T` is dropped. +// `T` to be `Send` because any thread that has an `Arc<T>` may ultimately access `T` using a +// mutable reference when the reference count reaches zero and `T` is dropped. unsafe impl<T: ?Sized + Sync + Send> Send for Arc<T> {} // SAFETY: It is safe to send `&Arc<T>` to another thread when the underlying `T` is `Sync` for the |