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 for more details.
Implementations on Foreign Types
impl Send for Argument
impl Send for FormatSpec
impl Send for Alignment
impl Send for Count
impl !Send for Args
impl<T> Send for JoinHandle<T>
impl<'a> Send for IoSlice<'a>
impl<T> Send for SyncOnceCell<T> where
T: Send,
impl !Send for ArgsOs
impl<'a> Send for IoSliceMut<'a>
impl<'_, T> Send for &'_ mut T where
T: Send + ?Sized,
impl Send for Waker
impl<T> !Send for *mut T where
T: ?Sized,
impl<'_, T> Send for &'_ T where
T: Sync + ?Sized,
impl<T> !Send for *const T where
T: ?Sized,
impl<T> Send for LinkedList<T> where
T: Send,
impl<'_, T> Send for IterMut<'_, T> where
T: Send,
impl<'_, T> Send for Iter<'_, T> where
T: Sync,
impl<'_, T> Send for Cursor<'_, T> where
T: Sync,
impl<'_, T> Send for IterMut<'_, T> where
T: Send,
impl<'_, T, A> Send for Drain<'_, T, A> where
T: Send,
A: Allocator + Send,
impl<'_, T> Send for CursorMut<'_, T> where
T: Send,
impl<'_, T, A> Send for RawDrain<'_, T, A> where
A: Allocator + Copy,
T: Send,
impl<T, A> Send for RawIntoIter<T, A> where
A: Allocator + Clone,
T: Send,
impl<'_, K, V, S, A> Send for RawOccupiedEntryMut<'_, K, V, S, A> where
K: Send,
V: Send,
A: Send + Allocator + Clone,
impl<T> Send for Bucket<T>
impl<T, A> Send for RawTable<T, A> where
A: Allocator + Clone,
T: 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> Send for IterMut<'_, K, V> where
K: Send,
V: Send,
impl Send for AllocScratch
impl<T> Send for ScratchVec<T> where
T: Send,
impl Send for AlignedVec
impl Send for AllocScratchError
impl<Dyn> Send for DynMetadata<Dyn> where
Dyn: ?Sized,
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<'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<'_, K, V> Send for IterMut<'_, K, V> where
K: Send,
V: Send,
Implementors
impl Send for wasmer_types::lib::std::sync::Once
impl<'_> Send for wasmer_types::lib::std::string::Drain<'_>
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 wasmer_types::lib::std::slice::Iter<'_, T> where
T: Sync,
impl<'_, T> Send for wasmer_types::lib::std::slice::IterMut<'_, T> where
T: Send,
impl<'_, T, A> Send for wasmer_types::lib::std::vec::Drain<'_, T, A> where
T: Send,
A: Send + Allocator,
impl<Dyn> Send for wasmer_types::lib::std::ptr::DynMetadata<Dyn> where
Dyn: ?Sized,
impl<T> !Send for NonNull<T> where
T: ?Sized,
NonNull
pointers are not Send
because the data they reference may be aliased.