pub unsafe auto trait Send { }Expand description
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 LocalWaker
impl Send for Waker
impl<Dyn: ?Sized> Send for DynMetadata<Dyn>
impl<T> Send for Cell<T>
impl<T> Send for RefCell<T>
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 RChunksExactMut<'_, T>where
T: Send,
impl<T> Send for RChunksMut<'_, T>where
T: Send,
impl<T> Send for AtomicPtr<T>
impl<T: Send> Send for core::slice::IterMut<'_, T>
impl<T: Sync + ?Sized> Send for &T
impl<T: Sync> Send for core::slice::Iter<'_, T>
impl<T: ?Sized> !Send for *const T
impl<T: ?Sized> !Send for *mut T
impl<T: ?Sized> !Send for NonNull<T>
NonNull pointers are not Send because the data they reference may be aliased.