# Trait std::marker::Sync 1.0.0[−][src]

    #[lang = "sync"]
    pub unsafe auto trait Sync { }

Types for which it is safe to share references between threads.

This trait is automatically implemented when the compiler determines it's appropriate.

The precise definition is: a type `T` is `Sync` if and only if `&T` is `Send`. In other words, if there is no possibility of undefined behavior (including data races) when passing `&T` references between threads.

As one would expect, primitive types like `u8` and `f64` are all `Sync`, and so are simple aggregate types containing them, like tuples, structs and enums. More examples of basic `Sync` types include "immutable" types like `&T`, and those with simple inherited mutability, such as `Box<T>`, `Vec<T>` and most other collection types. (Generic parameters need to be `Sync` for their container to be `Sync`.)

A somewhat surprising consequence of the definition is that `&mut T` is `Sync` (if `T` is `Sync`) even though it seems like that might provide unsynchronized mutation. The trick is that a mutable reference behind a shared reference (that is, `& &mut T`) becomes read-only, as if it were a `& &T`. Hence there is no risk of a data race.

Types that are not `Sync` are those that have "interior mutability" in a non-thread-safe form, such as `cell::Cell` and `cell::RefCell`. These types allow for mutation of their contents even through an immutable, shared reference. For example the `set` method on `Cell<T>` takes `&self`, so it requires only a shared reference `&Cell<T>`. The method performs no synchronization, thus `Cell` cannot be `Sync`.

Another example of a non-`Sync` type is the reference-counting pointer `rc::Rc`. Given any reference `&Rc<T>`, you can clone a new `Rc<T>`, modifying the reference counts in a non-atomic way.

For cases when one does need thread-safe interior mutability, Rust provides atomic data types, as well as explicit locking via `sync::Mutex` and `sync::RwLock`. These types ensure that any mutation cannot cause data races, hence the types are `Sync`. Likewise, `sync::Arc` provides a thread-safe analogue of `Rc`.

Any types with interior mutability must also use the `cell::UnsafeCell` wrapper around the value(s) which can be mutated through a shared reference. Failing to doing this is undefined behavior. For example, `transmute`-ing from `&T` to `&mut T` is invalid.

See the Nomicon for more details about `Sync`.

## Implementations on Foreign Types

###

`impl Sync for Argument`

###

`impl Sync for FormatSpec`

###

`impl Sync for Alignment`

###

`impl Sync for Count`

###

`impl Sync for Position`

###

`impl Sync for uint16x4_t`

###

`impl Sync for int32x4_t`

###

`impl Sync for int8x16_t`

###

`impl Sync for float64x1_t`

###

`impl Sync for uint16x8_t`

###

`impl Sync for int16x4_t`

###

`impl Sync for uint32x2_t`

###

`impl Sync for int16x8_t`

###

`impl Sync for float64x2_t`

###

`impl Sync for poly16x8_t`

###

`impl Sync for uint64x1_t`

###

`impl Sync for uint64x2_t`

###

`impl Sync for float32x4_t`

###

`impl Sync for poly8x8_t`

###

`impl Sync for uint8x8_t`

###

`impl Sync for poly16x4_t`

###

`impl Sync for int64x1_t`

###

`impl Sync for poly8x16_t`

###

`impl Sync for uint32x4_t`

###

`impl Sync for int64x2_t`

###

`impl Sync for int32x2_t`

###

`impl Sync for uint8x16_t`

###

`impl Sync for float32x2_t`

###

`impl Sync for int8x8_t`

## Implementors

- `impl<T> !Sync for UnsafeCell<T> where T: ?Sized,` | [src]

- `impl<T> !Sync for RefCell<T> where T: ?Sized,` | [src]

- `impl<T> Sync for AtomicPtr<T>` | [src]

- `impl Sync for AtomicU32` | [src]

- `impl Sync for AtomicI32` | [src]

- `impl<T> !Sync for Cell<T> where T: ?Sized,` | [src]

- `impl<T> !Sync for *mut T where T: ?Sized,` | [src]

- `impl<'a, T> Sync for std::slice::IterMut<'a, T> where T: Sync,` | [src]

- `impl<T> !Sync for NonNull<T> where T: ?Sized,` | [src]

- `impl Sync for AtomicUsize` | [src]

- `impl Sync for AtomicBool` | [src]

- `impl<T> !Sync for *const T where T: ?Sized,` | [src]

- `impl Sync for AtomicU8` | [src]

- `impl Sync for AtomicI64` | [src]

- `impl Sync for AtomicIsize` | [src]

- `impl Sync for Waker` | [src]

- `impl Sync for AtomicI16` | [src]

- `impl Sync for AtomicU16` | [src]

- `impl<'a, T> Sync for std::slice::Iter<'a, T> where T: Sync,` | [src]

- `impl Sync for AtomicI8` | [src]

- `impl !Sync for LocalWaker` | [src]

- `impl Sync for AtomicU64` | [src]

- `impl<'a, T> Sync for std::vec::Drain<'a, T> where T: Sync,` | [src]

- `impl<'a, T> Sync for std::collections::vec_deque::Drain<'a, T> where T: Sync,` | [src]

- `impl<'a, T> Sync for std::collections::linked_list::Iter<'a, T> where T: Sync,` | [src]

- `impl<'a> Sync for std::string::Drain<'a>` | [src]

- `impl<T> !Sync for Rc<T> where T: ?Sized,` | [src]

- `impl<T> !Sync for std::rc::Weak<T> where T: ?Sized,` | [src]

- `impl<T> Sync for std::sync::Weak<T> where T: Send + Sync + ?Sized,` | [src]

- `impl<T> Sync for std::vec::IntoIter<T> where T: Sync,` | [src]

- `impl<T> Sync for Arc<T> where T: Send + Sync + ?Sized,` | [src]

- `impl<'a, T> Sync for std::collections::linked_list::IterMut<'a, T> where T: Sync,` | [src]

- `impl<T> Sync for LinkedList<T> where T: Sync,` | [src]

- `impl<T> Sync for JoinHandle<T>` | [src]

- `impl !Sync for Args` | [src]

- `impl !Sync for ArgsOs` | [src]

- `impl<T> !Sync for Receiver<T>` | [src]

- `impl<T> !Sync for Sender<T>` | [src]

- `impl<T: ?Sized + Send> Sync for Mutex<T>` | [src]

- `impl<'a, T: ?Sized + Sync> Sync for MutexGuard<'a, T>` | [src]

- `impl Sync for std::sync::Once` | [src]

- `impl<T: ?Sized + Send + Sync> Sync for RwLock<T>` | [src]

- `impl<'a, T: ?Sized + Sync> Sync for RwLockReadGuard<'a, T>` | [src]

- `impl<'a, T: ?Sized + Sync> Sync for RwLockWriteGuard<'a, T>` | [src]

## Auto implementors

- `impl Sync for isize` |

- `impl Sync for i8` |

- `impl Sync for i16` |

- `impl Sync for i32` |

- `impl Sync for i64` |

- `impl Sync for i128` |

- `impl Sync for usize` |

- `impl Sync for u8` |

- `impl Sync for u16` |

- `impl Sync for u32` |

- `impl Sync for u64` |

- `impl Sync for u128` |

- `impl Sync for f32` |

- `impl Sync for f64` |

- `impl Sync for char` |

- `impl Sync for str` |

- `impl Sync for str` |

- `impl Sync for TypeId` |

- `impl Sync for BorrowError` |

- `impl Sync for BorrowMutError` |

- `impl<'b, T> !Sync for Ref<'b, T>` |

- `impl<'b, T> !Sync for RefMut<'b, T>` |

- `impl Sync for std::cmp::Ordering` |

- `impl<T> Sync for Reverse<T> where T: Sync,` |

- `impl<H> Sync for BuildHasherDefault<H> where H: Sync,` |

- `impl Sync for SipHasher` |

- `impl<T> Sync for Rev<T> where T: Sync,` |

- `impl<I> Sync for Cloned<I> where I: Sync,` |

- `impl<I> Sync for Cycle<I> where I: Sync,` |

- `impl<I> Sync for StepBy<I> where I: Sync,` |

- `impl<A, B> Sync for std::iter::Chain<A, B> where A: Sync, B: Sync,` |

- `impl<A, B> Sync for Zip<A, B> where A: Sync, B: Sync,` |

- `impl<I, F> Sync for Map<I, F> where F: Sync, I: Sync,` |

- `impl<I, P> Sync for Filter<I, P> where I: Sync, P: Sync,` |

- `impl<I, F> Sync for FilterMap<I, F> where F: Sync, I: Sync,` |

- `impl<I> Sync for Enumerate<I> where I: Sync,` |

- `impl<I> Sync for Peekable<I> where I: Sync, <I as Iterator>::Item: Sync,` |

- `impl<I, P> Sync for SkipWhile<I, P> where I: Sync, P: Sync,` |

- `impl<I, P> Sync for TakeWhile<I, P> where I: Sync, P: Sync,` |

- `impl<I> Sync for Skip<I> where I: Sync,` |

- `impl<I> Sync for std::iter::Take<I> where I: Sync,` |

- `impl<I, St, F> Sync for Scan<I, St, F> where F: Sync, I: Sync, St: Sync,` |

- `impl<I, U, F> Sync for FlatMap<I, U, F> where F: Sync, I: Sync, <U as IntoIterator>::IntoIter: Sync,` |

- `impl<I> Sync for Flatten<I> where I: Sync, <<I as Iterator>::Item as IntoIterator>::IntoIter: Sync,` |

- `impl<I> Sync for Fuse<I> where I: Sync,` |

- `impl<I, F> Sync for Inspect<I, F> where F: Sync, I: Sync,` |

- `impl<T> Sync for std::iter::Empty<T> where T: Sync,` |

- `impl<F> Sync for RepeatWith<F> where F: Sync,` |

- `impl<T> Sync for std::iter::Once<T> where T: Sync,` |

- `impl<A> Sync for std::iter::Repeat<A> where A: Sync,` |

- `impl<T: ?Sized> Sync for PhantomData<T> where T: Sync,` |

- `impl Sync for Pinned` |

- `impl<T> Sync for Discriminant<T>` |

- `impl<T> Sync for ManuallyDrop<T> where T: Sync,` |

- `impl<'a, T: ?Sized> Sync for PinMut<'a, T> where T: Sync,` |

- `impl<T> Sync for Bound<T> where T: Sync,` |

- `impl<Idx> Sync for std::ops::Range<Idx> where Idx: Sync,` |

- `impl<Idx> Sync for RangeTo<Idx> where Idx: Sync,` |

- `impl<Y, R> Sync for GeneratorState<Y, R> where R: Sync, Y: Sync,` |

- `impl<Idx> Sync for RangeInclusive<Idx> where Idx: Sync,` |

- `impl Sync for RangeFull` |

- `impl<Idx> Sync for RangeToInclusive<Idx> where Idx: Sync,` |

- `impl<Idx> Sync for RangeFrom<Idx> where Idx: Sync,` |

- `impl !Sync for TraitObject` |

- `impl<T, E> Sync for Result<T, E> where E: Sync, T: Sync,` |

- `impl<'a, T> Sync for std::result::Iter<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::result::IterMut<'a, T> where T: Sync,` |

- `impl<T> Sync for std::result::IntoIter<T> where T: Sync,` |

- `impl<T> Sync for Option<T> where T: Sync,` |

- `impl<'a, A> Sync for std::option::Iter<'a, A> where A: Sync,` |

- `impl<'a, A> Sync for std::option::IterMut<'a, A> where A: Sync,` |

- `impl<A> Sync for std::option::IntoIter<A> where A: Sync,` |

- `impl Sync for NoneError` |

- `impl<T: ?Sized> Sync for Box<T> where T: Sync,` |

- `impl<T: ?Sized> Sync for PinBox<T> where T: Sync,` |

- `impl<'a, B: ?Sized> Sync for Cow<'a, B> where B: Sync, <B as ToOwned>::Owned: Sync,` |

- `impl<'a, 'b> !Sync for DebugSet<'a, 'b>` |

- `impl<'a> !Sync for Formatter<'a>` |

- `impl<'a> !Sync for Arguments<'a>` |

- `impl<'a, 'b> !Sync for DebugMap<'a, 'b>` |

- `impl<'a, 'b> !Sync for DebugStruct<'a, 'b>` |

- `impl<'a, 'b> !Sync for DebugList<'a, 'b>` |

- `impl<'a, 'b> !Sync for DebugTuple<'a, 'b>` |

- `impl Sync for std::fmt::Error` |

- `impl Sync for std::fmt::Alignment` |

- `impl<'a, T, P> Sync for SplitNMut<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a, T, P> Sync for std::slice::RSplit<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a, T, P> Sync for SplitMut<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a, T> Sync for ExactChunksMut<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for Windows<'a, T> where T: Sync,` |

- `impl<'a, T, P> Sync for std::slice::RSplitN<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a, T> Sync for Chunks<'a, T> where T: Sync,` |

- `impl<'a, T, P> Sync for std::slice::SplitN<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a, T> Sync for ExactChunks<'a, T> where T: Sync,` |

- `impl<'a, T, P> Sync for std::slice::Split<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a, T> Sync for ChunksMut<'a, T> where T: Sync,` |

- `impl<'a, T, P> Sync for RSplitNMut<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a, T, P> Sync for RSplitMut<'a, T, P> where P: Sync, T: Sync,` |

- `impl<'a> Sync for std::str::Bytes<'a>` |

- `impl<'a, P> Sync for Matches<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a> Sync for SplitWhitespace<'a>` |

- `impl<'a, P> Sync for std::str::RSplit<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a, P> Sync for RMatchIndices<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl Sync for ParseBoolError` |

- `impl<'a> Sync for EncodeUtf16<'a>` |

- `impl Sync for Utf8Error` |

- `impl<'a, P> Sync for RSplitTerminator<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a, P> Sync for std::str::RSplitN<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a> Sync for CharIndices<'a>` |

- `impl<'a> Sync for std::str::Chars<'a>` |

- `impl<'a, P> Sync for SplitTerminator<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a, P> Sync for std::str::SplitN<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a, P> Sync for std::str::Split<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a, P> Sync for MatchIndices<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl<'a> Sync for SplitAsciiWhitespace<'a>` |

- `impl<'a> Sync for LinesAny<'a>` |

- `impl<'a, P> Sync for RMatches<'a, P> where <P as Pattern<'a>>::Searcher: Sync,` |

- `impl Sync for SearchStep` |

- `impl<'a> Sync for CharSearcher<'a>` |

- `impl<'a, 'b> Sync for CharSliceSearcher<'a, 'b>` |

- `impl<'a, F> Sync for CharPredicateSearcher<'a, F> where F: Sync,` |

- `impl<'a, 'b> Sync for StrSearcher<'a, 'b>` |

- `impl<'a> Sync for std::str::Lines<'a>` |

- `impl Sync for String` |

- `impl Sync for FromUtf8Error` |

- `impl Sync for FromUtf16Error` |

- `impl Sync for ParseError` |

- `impl<T> Sync for Vec<T> where T: Sync,` |

- `impl<'a, I> Sync for Splice<'a, I> where I: Sync, <I as Iterator>::Item: Sync,` |

- `impl<'a, T, F> Sync for std::vec::DrainFilter<'a, T, F> where F: Sync, T: Sync,` |

- `impl Sync for EscapeUnicode` |

- `impl Sync for std::char::EscapeDefault` |

- `impl Sync for EscapeDebug` |

- `impl Sync for ToLowercase` |

- `impl Sync for ToUppercase` |

- `impl Sync for ParseCharError` |

- `impl Sync for InvalidSequence` |

- `impl Sync for DecodeUtf16Error` |

- `impl Sync for UnicodeVersion` |

- `impl<I> Sync for DecodeUtf8<I> where I: Sync,` |

- `impl<I> Sync for DecodeUtf16<I> where I: Sync,` |

- `impl Sync for CharTryFromError` |

- `impl<T> Sync for LocalKey<T>` |

- `impl Sync for AccessError` |

- `impl Sync for Builder` |

- `impl Sync for ThreadId` |

- `impl Sync for Thread` |

- `impl Sync for std::ascii::EscapeDefault` |

- `impl<T> Sync for BinaryHeap<T> where T: Sync,` |

- `impl<K, V> Sync for BTreeMap<K, V> where K: Sync, V: Sync,` |

- `impl<T> Sync for BTreeSet<T> where T: Sync,` |

- `impl<T> Sync for VecDeque<T> where T: Sync,` |

- `impl<'a, T> Sync for PeekMut<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::binary_heap::Iter<'a, T> where T: Sync,` |

- `impl<T> Sync for std::collections::binary_heap::IntoIter<T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::binary_heap::Drain<'a, T> where T: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::Entry<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::IterMut<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::Keys<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for RangeMut<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::Range<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::Iter<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::VacantEntry<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::ValuesMut<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::OccupiedEntry<'a, K, V> where K: Sync, V: Sync,` |

- `impl<K, V> Sync for std::collections::btree_map::IntoIter<K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::btree_map::Values<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, T> Sync for std::collections::btree_set::SymmetricDifference<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::btree_set::Intersection<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::btree_set::Range<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::btree_set::Iter<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::btree_set::Union<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::btree_set::Difference<'a, T> where T: Sync,` |

- `impl<T> Sync for std::collections::btree_set::IntoIter<T> where T: Sync,` |

- `impl<T> Sync for std::collections::linked_list::IntoIter<T> where T: Sync,` |

- `impl<'a, T, F> !Sync for std::collections::linked_list::DrainFilter<'a, T, F>` |

- `impl<'a, T> Sync for std::collections::vec_deque::Iter<'a, T> where T: Sync,` |

- `impl<'a, T> Sync for std::collections::vec_deque::IterMut<'a, T> where T: Sync,` |

- `impl<T> Sync for std::collections::vec_deque::IntoIter<T> where T: Sync,` |

- `impl Sync for CollectionAllocErr` |

- `impl<K, V, S> Sync for HashMap<K, V, S> where K: Sync, S: Sync, V: Sync,` |

- `impl<T, S> Sync for HashSet<T, S> where S: Sync, T: Sync,` |

- `impl<'a, K, V> Sync for std::collections::hash_map::Iter<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::hash_map::IterMut<'a, K, V> where K: Sync, V: Sync,` |

- `impl<K, V> Sync for std::collections::hash_map::IntoIter<K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::hash_map::Keys<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::hash_map::Values<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::hash_map::Drain<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> Sync for std::collections::hash_map::ValuesMut<'a, K, V> where K: Sync, V: Sync,` |

- `impl<'a, K, V> !Sync for std::collections::hash_map::OccupiedEntry<'a, K, V>` |

- `impl<'a, K, V> !Sync for std::collections::hash_map::VacantEntry<'a, K, V>` |

- `impl Sync for RandomState` |

- `impl Sync for DefaultHasher` |

- `impl<'a, K, V> !Sync for std::collections::hash_map::Entry<'a, K, V>` |

- `impl<'a, K> Sync for std::collections::hash_set::Iter<'a, K> where K: Sync,` |

- `impl<K> Sync for std::collections::hash_set::IntoIter<K> where K: Sync,` |

- `impl<'a, K> Sync for std::collections::hash_set::Drain<'a, K> where K: Sync,` |

- `impl<'a, T, S> Sync for std::collections::hash_set::Intersection<'a, T, S> where S: Sync, T: Sync,` |

- `impl<'a, T, S> Sync for std::collections::hash_set::Difference<'a, T, S> where S: Sync, T: Sync,` |

- `impl<'a, T, S> Sync for std::collections::hash_set::SymmetricDifference<'a, T, S> where S: Sync, T: Sync,` |

- `impl<'a, T, S> Sync for std::collections::hash_set::Union<'a, T, S> where S: Sync, T: Sync,` |

- `impl !Sync for Vars` |

- `impl !Sync for VarsOs` |

- `impl<'a> Sync for SplitPaths<'a>` |

- `impl Sync for JoinPathsError` |

- `impl Sync for VarError` |

- `impl Sync for CString` |

- `impl Sync for CStr` |

- `impl Sync for NulError` |

- `impl Sync for IntoStringError` |

- `impl Sync for FromBytesWithNulError` |

- `impl Sync for OsString` |

- `impl Sync for OsStr` |

- `impl Sync for File` |

- `impl Sync for Metadata` |

- `impl Sync for ReadDir` |

- `impl Sync for DirEntry` |

- `impl Sync for OpenOptions` |

- `impl Sync for Permissions` |

- `impl Sync for FileType` |

- `impl Sync for DirBuilder` |

- `impl<R> Sync for BufReader<R> where R: Sync,` |

- `impl<W> Sync for BufWriter<W> where W: Sync,` |

- `impl<W> Sync for LineWriter<W> where W: Sync,` |

- `impl<W> Sync for IntoInnerError<W> where W: Sync,` |

- `impl<T> Sync for Cursor<T> where T: Sync,` |

- `impl Sync for std::io::Error` |

- `impl Sync for Sink` |

- `impl Sync for std::io::Empty` |

- `impl Sync for std::io::Repeat` |

- `impl Sync for Stdin` |

- `impl Sync for Stdout` |

- `impl Sync for Stderr` |

- `impl<'a> Sync for StdoutLock<'a>` |

- `impl<'a> Sync for StderrLock<'a>` |

- `impl<'a> Sync for StdinLock<'a>` |

- `impl Sync for Initializer` |

- `impl<T, U> Sync for std::io::Chain<T, U> where T: Sync, U: Sync,` |

- `impl<T> Sync for std::io::Take<T> where T: Sync,` |

- `impl<R> Sync for std::io::Bytes<R> where R: Sync,` |

- `impl<R> Sync for std::io::Chars<R> where R: Sync,` |

- `impl<B> Sync for std::io::Split<B> where B: Sync,` |

- `impl<B> Sync for std::io::Lines<B> where B: Sync,` |

- `impl Sync for ErrorKind` |

- `impl Sync for SeekFrom` |

- `impl Sync for CharsError` |

- `impl Sync for Ipv4Addr` |

- `impl Sync for Ipv6Addr` |

- `impl Sync for SocketAddrV4` |

- `impl Sync for SocketAddrV6` |

- `impl Sync for TcpStream` |

- `impl Sync for TcpListener` |

- `impl<'a> Sync for std::net::Incoming<'a>` |

- `impl Sync for UdpSocket` |

- `impl Sync for AddrParseError` |

- `impl Sync for IpAddr` |

- `impl Sync for Ipv6MulticastScope` |

- `impl Sync for std::net::SocketAddr` |

- `impl Sync for Shutdown` |

- `impl Sync for FpCategory` |

- `impl Sync for ParseIntError` |

- `impl Sync for ParseFloatError` |

- `impl Sync for TryFromIntError` |

- `impl<T> Sync for Wrapping<T> where T: Sync,` |

- `impl Sync for NonZeroU8` |

- `impl Sync for NonZeroU16` |

- `impl Sync for NonZeroU32` |

- `impl Sync for NonZeroU64` |

- `impl Sync for NonZeroU128` |

- `impl Sync for NonZeroUsize` |

- `impl Sync for std::os::unix::net::SocketAddr` |

- `impl Sync for UnixStream` |

- `impl Sync for UnixListener` |

- `impl<'a> Sync for std::os::unix::net::Incoming<'a>` |

- `impl Sync for UnixDatagram` |

- `impl<'a> Sync for EncodeWide<'a>` |

- `impl Sync for stat` |

- `impl Sync for c_void` |

- `impl<'a> !Sync for PanicInfo<'a>` |

- `impl<'a> Sync for Location<'a>` |

- `impl<T> Sync for AssertUnwindSafe<T> where T: Sync,` |

- `impl<'a> Sync for PrefixComponent<'a>` |

- `impl<'a> Sync for Components<'a>` |

- `impl<'a> Sync for std::path::Iter<'a>` |

- `impl<'a> Sync for Ancestors<'a>` |

- `impl Sync for PathBuf` |

- `impl Sync for Path` |

- `impl Sync for StripPrefixError` |

- `impl<'a> Sync for Display<'a>` |

- `impl<'a> Sync for Prefix<'a>` |

- `impl<'a> Sync for Component<'a>` |

- `impl Sync for Child` |

- `impl Sync for ChildStdin` |

- `impl Sync for ChildStdout` |

- `impl Sync for ChildStderr` |

- `impl !Sync for Command` |

- `impl Sync for Output` |

- `impl Sync for Stdio` |

- `impl Sync for ExitStatus` |

- `impl Sync for ExitCode` |

- `impl Sync for std::sync::atomic::Ordering` |

- `impl Sync for Barrier` |

- `impl Sync for BarrierWaitResult` |

- `impl Sync for Condvar` |

- `impl Sync for WaitTimeoutResult` |

- `impl Sync for OnceState` |

- `impl<T> Sync for PoisonError<T> where T: Sync,` |

- `impl<T> Sync for TryLockError<T> where T: Sync,` |

- `impl !Sync for Select` |

- `impl<'rx, T> !Sync for Handle<'rx, T>` |

- `impl<'a, T> !Sync for std::sync::mpsc::Iter<'a, T>` |

- `impl<'a, T> !Sync for TryIter<'a, T>` |

- `impl<T> !Sync for std::sync::mpsc::IntoIter<T>` |

- `impl<T> Sync for SyncSender<T> where T: Send,` |

- `impl<T> Sync for SendError<T> where T: Sync,` |

- `impl Sync for RecvError` |

- `impl Sync for TryRecvError` |

- `impl Sync for RecvTimeoutError` |

- `impl<T> Sync for TrySendError<T> where T: Sync,` |

- `impl Sync for Duration` |

- `impl Sync for Instant` |

- `impl Sync for SystemTime` |

- `impl Sync for SystemTimeError` |

- `impl<'a> !Sync for Context<'a>` |

- `impl !Sync for SpawnObjError` |

- `impl<T> Sync for Poll<T> where T: Sync,` |

- `impl !Sync for LocalWaker` |

- `impl Sync for SpawnErrorKind` |

- `impl !Sync for SpawnLocalObjError` |

- `impl<'a, T> !Sync for FutureObj<'a, T>` |

- `impl<'a, T> !Sync for LocalFutureObj<'a, T>` |

- `impl Sync for Global` |

- `impl Sync for LayoutErr` |

- `impl Sync for CannotReallocInPlace` |

- `impl !Sync for Excess` |

- `impl Sync for AllocErr` |

- `impl Sync for Layout` |

- `impl Sync for System` |

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g. `str,u8` or `String,struct:Vec,test`)