Trait rustc_data_structures::sync::Send
1.0.0 · source · 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 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 and the Sync
trait for more details.
Implementors§
impl !Send for LocalWaker
impl !Send for Args
impl !Send for ArgsOs
impl Send for DroplessArena
impl Send for OwnedSlice
impl Send for alloc::string::Drain<'_>
impl Send for Waker
impl Send for Collector
impl Send for Parker
impl Send for Select<'_>
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 hashbrown::map::OccupiedEntryRef<'a, 'b, K, Q, V, S, 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 MappedMutexGuard<'a, R, T>
impl<'a, R, T> Send for MappedRwLockReadGuard<'a, R, T>
impl<'a, R, T> Send for 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 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::map::RawOccupiedEntryMut<'_, K, V, S, A>
impl<K, V, S, A> Send for OccupiedEntry<'_, K, V, S, A>
impl<K, V, S, A> Send for 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 Mutex<R, T>
impl<R, T> Send for 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 TypedArena<T>where
T: Send,
impl<T> Send for ThinBox<T>
ThinBox<T>
is Send
if T
is Send
because the data is owned.