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 std::env::Args
impl !Send for ArgsOs
impl !Send for Arguments<'_>
impl !Send for std::sys::args::common::Args
Available on
target_family=unix and neither target_os=espidf nor target_os=vita, or target_family=windows, or HermitCore, or target_os=motor, or target_os=uefi, or WASI, or target_os=xous only.impl !Send for Env
Available on
target_family=unix, or HermitCore, or target_os=motor, or Fortanix and SGX, or target_os=solid_asp3, or target_os=uefi, or WASI, or target_os=xous only.impl !Send for LocalWaker
impl Send for std::backtrace_rs::backtrace::libunwind::Frame
impl Send for core::ffi::c_str::Bytes<'_>
impl Send for TypeId
impl Send for ResumeTy
impl Send for Repr
Available on 64-bit and non-
target_os=uefi only.impl Send for BorrowedHandle<'_>
Available on Windows only.
impl Send for HandleOrInvalid
Available on Windows only.
impl Send for HandleOrNull
Available on Windows only.
impl Send for OwnedHandle
Available on Windows only.
impl Send for Location<'_>
impl Send for std::string::Drain<'_>
impl Send for Dir
impl Send for LookupHost
impl Send for CStringArray
impl Send for std::sys::thread::unix::Thread
impl Send for std::task::Waker
impl<'a> Send for std::io::IoSlice<'a>
impl<'a> Send for std::io::IoSliceMut<'a>
impl<Dyn> Send for DynMetadata<Dyn>where
Dyn: ?Sized,
impl<F> Send for DlsymWeak<F>
Available on Linux and GNU only.
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 &T
impl<T> Send for ThinBox<T>
ThinBox<T> is Send if T is Send because the data is owned.
impl<T> Send for Cell<T>
impl<T> Send for RefCell<T>
impl<T> Send for std::collections::linked_list::Iter<'_, T>where
T: Sync,
impl<T> Send for std::collections::linked_list::IterMut<'_, T>where
T: Send,
impl<T> Send for NonZero<T>where
T: ZeroablePrimitive + Send,
impl<T> Send for Unique<T>
Unique pointers are Send if T is Send because the data they
reference is unaliased. Note that this aliasing invariant is
unenforced by the type system; the abstraction using the
Unique must enforce it.
impl<T> Send for ChunksExactMut<'_, T>where
T: Send,
impl<T> Send for ChunksMut<'_, T>where
T: Send,
impl<T> Send for std::slice::Iter<'_, T>where
T: Sync,
impl<T> Send for std::slice::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 AtomicPtr<T>
Available on
target_has_atomic_load_store=ptr only.impl<T> Send for JoinHandle<T>
impl<T, A> !Send for Rc<T, A>
impl<T, A> !Send for UniqueRc<T, A>
impl<T, A> !Send for std::rc::Weak<T, A>
impl<T, A> Send for std::collections::linked_list::Cursor<'_, T, A>
impl<T, A> Send for std::collections::linked_list::CursorMut<'_, T, A>
impl<T, A> Send for LinkedList<T, A>
impl<T, A> Send for std::collections::vec_deque::Drain<'_, T, A>
impl<T, A> Send for Arc<T, A>
impl<T, A> Send for UniqueArc<T, A>
impl<T, A> Send for std::sync::Weak<T, A>
impl<T, A> Send for std::vec::Drain<'_, T, A>
impl<T, A> Send for std::vec::IntoIter<T, A>
impl<T: Send + ?Sized> Send for ReentrantLock<T>
impl<T: Send> Send for std::sync::mpmc::Receiver<T>
impl<T: Send> Send for std::sync::mpmc::Sender<T>
impl<T: Send> Send for std::sync::mpsc::Receiver<T>
impl<T: Send> Send for std::sync::mpsc::Sender<T>
impl<T: Send> Send for SyncSender<T>
impl<T: Send> Send for OnceLock<T>
impl<T: Send> Send for OnceBox<T>
impl<T: ?Sized + Send> 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: ?Sized + Send> Send for std::sync::nonpoison::rwlock::RwLock<T>
impl<T: ?Sized + Send> Send for std::sync::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: ?Sized + Send> Send for std::sync::RwLock<T>
impl<T: ?Sized> !Send for std::sync::nonpoison::mutex::MappedMutexGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::nonpoison::mutex::MutexGuard<'_, T>
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: ?Sized> !Send for std::sync::nonpoison::rwlock::MappedRwLockReadGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::nonpoison::rwlock::MappedRwLockWriteGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::nonpoison::rwlock::RwLockReadGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::nonpoison::rwlock::RwLockWriteGuard<'_, T>
impl<T: ?Sized> !Send for ReentrantLockGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::MappedMutexGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::MappedRwLockReadGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::MappedRwLockWriteGuard<'_, T>
impl<T: ?Sized> !Send for std::sync::MutexGuard<'_, T>
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.