pub unsafe auto trait Send { }
Available on crate feature
__utils
only.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 Rc
s 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 for more details.
Implementors
impl !Send for Args
impl !Send for ArgsOs
impl Send for alloc::string::Drain<'_>
impl Send for Waker
impl Send for Once
impl Send for AlignedVec
impl Send for AllocScratch
impl Send for AllocScratchError
impl Send for Buffer
impl Send for Collector
impl Send for Error
impl Send for Float32Array
impl Send for Float64Array
impl Send for Int8Array
impl Send for Int16Array
impl Send for Int32Array
impl Send for Parker
impl Send for Select<'_>
impl Send for Uint8Array
impl Send for Uint8ClampedArray
impl Send for Uint16Array
impl Send for Uint32Array
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> where
K: Send,
Q: Sync + ?Sized,
V: Send,
S: Send,
A: Send + Allocator + Clone,
impl<'a, 'i, K, S, M> Send for Iter<'i, K, S, M> where
K: 'a + Eq + Hash + Send,
S: 'a + BuildHasher + Clone,
M: Map<'a, K, (), S>,
impl<'a, 'i, K, V, S, M> Send for Iter<'i, K, V, S, M> where
K: 'a + Eq + Hash + Send,
V: 'a + Send,
S: 'a + BuildHasher + Clone,
M: Map<'a, K, V, S>,
impl<'a, 'i, K, V, S, M> Send for IterMut<'i, K, V, S, M> where
K: 'a + Eq + Hash + Send,
V: 'a + Send,
S: 'a + BuildHasher + Clone,
M: Map<'a, K, V, S>,
impl<'a, K, V> Send for Iter<'a, K, V> where
K: Send,
V: Send,
impl<'a, K, V> Send for IterMut<'a, K, V> where
K: Send,
V: Send,
impl<'a, K, V, S> Send for OccupiedEntry<'a, K, V, S> where
K: Eq + Hash + Sync,
V: Sync,
S: BuildHasher,
impl<'a, K, V, S> Send for Ref<'a, K, V, S> where
K: Eq + Hash + Sync,
V: Sync,
S: BuildHasher,
impl<'a, K, V, S> Send for RefMulti<'a, K, V, S> where
K: Eq + Hash + Sync,
V: Sync,
S: BuildHasher,
impl<'a, K, V, S> Send for RefMut<'a, K, V, S> where
K: Eq + Hash + Sync,
V: Sync,
S: BuildHasher,
impl<'a, K, V, S> Send for RefMutMulti<'a, K, V, S> where
K: Eq + Hash + Sync,
V: Sync,
S: BuildHasher,
impl<'a, K, V, S> Send for VacantEntry<'a, K, V, S> where
K: Eq + Hash + Sync,
V: Sync,
S: BuildHasher,
impl<'a, R, T> Send for MappedMutexGuard<'a, R, T> where
R: 'a + RawMutex,
T: 'a + Send + ?Sized,
<R as RawMutex>::GuardMarker: Send,
impl<'a, R, T> Send for MappedRwLockReadGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Sync + ?Sized,
<R as RawRwLock>::GuardMarker: Send,
impl<'a, R, T> Send for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Send + ?Sized,
<R as RawRwLock>::GuardMarker: Send,
impl<'a, T> Send for Drain<'a, T> where
T: Send + Array,
impl<'a, T, const CAP: usize> Send for arrayvec::arrayvec::Drain<'a, T, CAP> where
T: Send,
impl<A> Send for SmallVec<A> where
A: Array,
<A as Array>::Item: Send,
impl<Dyn> Send for core::ptr::metadata::DynMetadata<Dyn> where
Dyn: ?Sized,
impl<Dyn> Send for DynMetadata<Dyn> where
Dyn: ?Sized,
impl<K, S> Send for OwningIter<K, S> where
K: Eq + Hash + Send,
S: BuildHasher + Clone + Send,
impl<K, V> Send for IterMut<'_, K, V> where
K: Send,
V: Send,
impl<K, V, S> Send for LruCache<K, V, S> where
K: Send,
V: Send,
S: Send,
impl<K, V, S> Send for OwningIter<K, V, S> where
K: Eq + Hash + Send,
V: Send,
S: BuildHasher + Clone + Send,
impl<K, V, S, A> Send for OccupiedEntry<'_, K, V, S, A> where
K: Send,
V: Send,
S: Send,
A: Send + Allocator + Clone,
impl<K, V, S, A> Send for RawOccupiedEntryMut<'_, K, V, S, A> where
K: Send,
V: Send,
S: Send,
A: Send + Allocator + Clone,
impl<R, G> Send for RawReentrantMutex<R, G> where
R: RawMutex + Send,
G: GetThreadId + Send,
impl<R, G, T> Send for ReentrantMutex<R, G, T> where
R: RawMutex + Send,
G: GetThreadId + Send,
T: Send + ?Sized,
impl<R, T> Send for Mutex<R, T> where
R: RawMutex + Send,
T: Send + ?Sized,
impl<R, T> Send for RwLock<R, T> where
R: RawRwLock + Send,
T: Send + ?Sized,
impl<T> !Send for *const T where
T: ?Sized,
impl<T> !Send for *mut T where
T: ?Sized,
impl<T> !Send for alloc::rc::Rc<T> where
T: ?Sized,
impl<T> !Send for alloc::rc::Weak<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 MutexGuard<'_, 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 where
T: Sync + ?Sized,
impl<T> Send for &mut T where
T: Send + ?Sized,
impl<T> Send for ThinBox<T> where
T: Send + ?Sized,
ThinBox<T>
is Send
if T
is Send
because the data is owned.