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 <[email protected]>
Reviewed-by: Andreas Hindborg <[email protected]>
Reviewed-by: Gary Guo <[email protected]>
Signed-off-by: Boqun Feng <[email protected]>
Link: https://patch.msgid.link/[email protected]
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 <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Signed-off-by: Andreas Hindborg <[email protected]>
Tested-by: Daniel Gomez <[email protected]>
Signed-off-by: Daniel Gomez <[email protected]>
FUJITA Tomonori