Trait MaybeSend

pub unsafe auto trait MaybeSend { }

Types that can be transferred across thread boundaries.

This trait is automatically implemented when the compiler determines it’s appropriate.

An example of a non-Send type is the reference-counting pointer rc::Rc. If two threads attempt to clone Rcs that point to the same reference-counted value, they might try to update the reference count at the same time, which is undefined behavior because Rc doesn’t use atomic operations. Its cousin sync::Arc does use atomic operations (incurring some overhead) and thus is Send.

See the Nomicon and the Sync trait for more details.

Implementors

impl !Send for Arguments<'_>

impl !Send for LocalWaker

impl Send for Bytes<'_>

impl Send for Waker

impl<Dyn> Send for DynMetadata<Dyn>

where Dyn: ?Sized,

impl<T> !Send for *const T

where T: ?Sized,

impl<T> !Send for *mut T

where T: ?Sized,

impl<T> !Send for NonNull<T>

where T: ?Sized,

NonNull pointers are not Send because the data they reference may be aliased.

impl<T> Send for &T

where T: Sync + ?Sized,

impl<T> Send for Cell<T>

where T: Send + ?Sized,

impl<T> Send for RefCell<T>

where T: Send + ?Sized,

impl<T> Send for NonZero<T>

where T: ZeroablePrimitive + Send,

impl<T> Send for ChunksExactMut<'_, T>

where T: Send,

impl<T> Send for ChunksMut<'_, T>

where T: Send,

impl<T> Send for Iter<'_, T>

where T: Sync,

impl<T> Send for IterMut<'_, T>

where T: Send,

impl<T> Send for RChunksExactMut<'_, T>

where T: Send,

impl<T> Send for RChunksMut<'_, T>

where T: Send,

impl<T> Send for AtomicPtr<T>

Auto implementors