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 std::sys::unix::args::Args
impl !Send for Env
impl Send for std::backtrace_rs::backtrace::libunwind::Frame
impl Send for Repr
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 std::string::Drain<'_>
impl Send for Dir
impl Send for Argv
impl Send for std::sys::unix::thread::Thread
impl Send for LookupHost
impl Send for std::task::Waker
impl<'a> Send for std::io::IoSlice<'a>
impl<'a> Send for std::io::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<Dyn> Send for DynMetadata<Dyn>where Dyn: ?Sized,
impl<K, V> Send for hashbrown::map::IterMut<'_, K, V>where K: Send, V: Send,
impl<K, V, A> Send for RustcOccupiedEntry<'_, K, V, A>where K: Send, V: Send, A: Allocator + Clone + Send,
impl<K, V, S, A> Send for hashbrown::map::OccupiedEntry<'_, K, V, S, A>where K: Send, V: Send, S: Send, A: Send + Allocator + Clone,
impl<K, V, S, A> Send for hashbrown::map::RawOccupiedEntryMut<'_, K, V, S, A>where K: Send, V: Send, S: Send, A: Send + Allocator + Clone,
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 Rc<T>where T: ?Sized,
impl<T> !Send for std::rc::Weak<T>where T: ?Sized,
impl<T> !Send for ReentrantMutexGuard<'_, T>
impl<T> Send for &Twhere T: Sync + ?Sized,
impl<T> Send for ThinBox<T>where T: Send + ?Sized,
ThinBox<T> is Send if T is Send because the data is owned.