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.
Dyn Compatibility§
This trait is dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety".
Implementors§
impl !Send for Arguments<'_>
impl !Send for LocalWaker
impl !Send for Args
impl !Send for ArgsOs
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::nonpoison::mutex::MappedMutexGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::nonpoison::mutex::MutexGuard<'_, T>where
T: ?Sized,
A MutexGuard is not Send to maximize platform portability.
On platforms that use POSIX threads (commonly referred to as pthreads) there is a requirement to
release mutex locks on the same thread they were acquired.
For this reason, MutexGuard must not implement Send to prevent it being dropped from
another thread.
impl<T> !Send for std::sync::nonpoison::rwlock::MappedRwLockReadGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::nonpoison::rwlock::MappedRwLockWriteGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::nonpoison::rwlock::RwLockReadGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::nonpoison::rwlock::RwLockWriteGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::poison::mutex::MappedMutexGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::poison::mutex::MutexGuard<'_, T>where
T: ?Sized,
A MutexGuard is not Send to maximize platform portability.
On platforms that use POSIX threads (commonly referred to as pthreads) there is a requirement to
release mutex locks on the same thread they were acquired.
For this reason, MutexGuard must not implement Send to prevent it being dropped from
another thread.
impl<T> !Send for std::sync::poison::rwlock::MappedRwLockReadGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::poison::rwlock::MappedRwLockWriteGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::poison::rwlock::RwLockReadGuard<'_, T>where
T: ?Sized,
impl<T> !Send for std::sync::poison::rwlock::RwLockWriteGuard<'_, T>where
T: ?Sized,
impl<T> !Send for ReentrantLockGuard<'_, T>where
T: ?Sized,
impl<T, A> !Send for Rc<T, A>
impl<T, A> !Send for UniqueRc<T, A>
impl<T, A> !Send for alloc::rc::Weak<T, A>
impl Send for TypeId
impl Send for core::ffi::c_str::Bytes<'_>
impl Send for Location<'_>
impl Send for Waker
impl Send for fvm_std::prelude::string::Drain<'_>
impl<'a> Send for IoSlice<'a>
impl<'a> Send for IoSliceMut<'a>
impl<'a, T, const CAP: usize> Send for arrayvec::arrayvec::Drain<'a, T, CAP>where
T: Send,
impl<Dyn> Send for DynMetadata<Dyn>where
Dyn: ?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.
impl<T> Send for alloc::collections::linked_list::Iter<'_, T>where
T: Sync,
impl<T> Send for alloc::collections::linked_list::IterMut<'_, T>where
T: Send,
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 core::slice::iter::Iter<'_, T>where
T: Sync,
impl<T> Send for core::slice::iter::IterMut<'_, 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 Atomic<T>where
T: AtomicPrimitive,
impl<T> Send for std::sync::mpmc::Receiver<T>where
T: Send,
impl<T> Send for std::sync::mpmc::Sender<T>where
T: Send,
impl<T> Send for std::sync::mpsc::Receiver<T>where
T: Send,
impl<T> Send for std::sync::mpsc::Sender<T>where
T: Send,
impl<T> Send for SyncSender<T>where
T: Send,
impl<T> Send for std::sync::nonpoison::mutex::Mutex<T>
T must be Send for a Mutex to be Send because it is possible to acquire
the owned T from the Mutex via into_inner.
impl<T> Send for std::sync::nonpoison::rwlock::RwLock<T>
impl<T> Send for OnceLock<T>where
T: Send,
impl<T> Send for std::sync::poison::mutex::Mutex<T>
T must be Send for a Mutex to be Send because it is possible to acquire
the owned T from the Mutex via into_inner.