linux.git/rust/kernel/sync/set_once.rs, branch v7.0 Linux kernel source tree rust: sync: set_once: Implement Send and Sync 2026-01-09T11:01:40+00:00 FUJITA Tomonori fujita.tomonori@gmail.com 2025-12-16T00:09:01+00:00 8a581130b1cbc17c702298b8325e3df98c792760 Implement Send and Sync for SetOnce<T> to allow it to be used across thread boundaries. Send: SetOnce<T> can be transferred across threads when T: Send, as the contained value is also transferred and will be dropped on the destination thread. Sync: SetOnce<T> can be shared across threads when T: Sync, as as_ref() provides shared references &T and atomic operations ensure proper synchronization. Since the inner T may be dropped on any thread, we also require T: Send. Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org> Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Link: https://patch.msgid.link/20251216000901.221375-1-fujita.tomonori@gmail.com 
Implement Send and Sync for SetOnce<T> to allow it to be used across
thread boundaries.

Send: SetOnce<T> can be transferred across threads when T: Send, as
the contained value is also transferred and will be dropped on the
destination thread.

Sync: SetOnce<T> can be shared across threads when T: Sync, as
as_ref() provides shared references &T and atomic operations ensure
proper synchronization. Since the inner T may be dropped on any
thread, we also require T: Send.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251216000901.221375-1-fujita.tomonori@gmail.com
rust: sync: add `SetOnce` 2025-11-03T13:40:35+00:00 Andreas Hindborg a.hindborg@kernel.org 2025-09-24T12:39:24+00:00 821fe7bf16c57d690f4f92997f4e51abb93e0347 Introduce the `SetOnce` type, a container that can only be written once. The container uses an internal atomic to synchronize writes to the internal value. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <lossin@kernel.org> Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org> Tested-by: Daniel Gomez <da.gomez@samsung.com> Signed-off-by: Daniel Gomez <da.gomez@kernel.org> 
Introduce the `SetOnce` type, a container that can only be written once.
The container uses an internal atomic to synchronize writes to the internal
value.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
Tested-by: Daniel Gomez <da.gomez@samsung.com>
Signed-off-by: Daniel Gomez <da.gomez@kernel.org>