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 Arguments<'_>
impl !Send for LocalWaker
impl !Send for Args
impl !Send for ArgsOs
impl Send for OwnedSlice
impl Send for alloc::string::Drain<'_>
impl Send for Bytes<'_>
impl Send for Waker
impl Send for DroplessArena
impl Send for Select<'_>
impl Send for Collector
impl Send for Parker
impl Send for Unparker
impl<'a> Send for IoSlice<'a>
impl<'a> Send for IoSliceMut<'a>
impl<'a, 'b, K, Q, V, S, A> Send for OccupiedEntryRef<'a, 'b, K, Q, V, S, A>
impl<'a, R, T> Send for lock_api::mutex::MappedMutexGuard<'a, R, T>
impl<'a, R, T> Send for lock_api::rwlock::MappedRwLockReadGuard<'a, R, T>
impl<'a, R, T> Send for lock_api::rwlock::MappedRwLockWriteGuard<'a, R, T>
impl<'a, T> Send for smallvec::Drain<'a, T>
impl<'a, T, const CAP: usize> Send for arrayvec::arrayvec::Drain<'a, T, CAP>where
T: Send,
impl<A> Send for SmallVec<A>
impl<Dyn> Send for DynMetadata<Dyn>where
Dyn: ?Sized,
impl<I, T> Send for IndexSlice<I, T>where
I: Idx,
T: Send,
impl<I, T> Send for IndexVec<I, T>where
I: Idx,
T: Send,
impl<K, V> Send for hashbrown::map::IterMut<'_, K, V>
impl<K, V> Send for hashbrown::map::IterMut<'_, K, V>
impl<K, V, A> Send for RustcOccupiedEntry<'_, K, V, A>
impl<K, V, S, A> Send for hashbrown::map::OccupiedEntry<'_, K, V, S, A>
impl<K, V, S, A> Send for hashbrown::raw_entry::RawOccupiedEntryMut<'_, K, V, S, A>
impl<K, V, S, A> Send for hashbrown::map::OccupiedEntry<'_, K, V, S, A>
impl<K, V, S, A> Send for hashbrown::map::RawOccupiedEntryMut<'_, K, V, S, A>
impl<P, T, const CP: bool> Send for CopyTaggedPtr<P, T, CP>
impl<R, G> Send for RawReentrantMutex<R, G>
impl<R, G, T> Send for ReentrantMutex<R, G, T>
impl<R, T> Send for lock_api::mutex::Mutex<R, T>
impl<R, T> Send for lock_api::rwlock::RwLock<R, T>
impl<T> !Send for *const Twhere
T: ?Sized,
impl<T> !Send for *mut Twhere
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 std::sync::mutex::MappedMutexGuard<'_, T>where
T: ?Sized,
impl<T> !Send for MutexGuard<'_, T>where
T: ?Sized,
impl<T> !Send for ReentrantLockGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::rwlock::MappedRwLockReadGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::rwlock::MappedRwLockWriteGuard<'_, T>where
T: ?Sized,
impl<T> !Send for RwLockReadGuard<'_, T>where
T: ?Sized,
impl<T> !Send for RwLockWriteGuard<'_, T>where
T: ?Sized,
impl<T> Send for &T
impl<T> Send for ThinBox<T>
ThinBox<T> is Send if T is Send because the data is owned.