Module sync

Thread-safe reference-counting pointers.

See the Arc<T> documentation for more details.

Note: This module is only available on platforms that support atomic loads and stores of pointers. This may be detected at compile time using #[cfg(target_has_atomic = "ptr")].

Macros

acquire 🔒

Structs

Arc

A thread-safe reference-counting pointer. ‘Arc’ stands for ‘Atomically Reference Counted’.

ArcInner 🔒

SliceArcInnerForStatic 🔒

Struct to hold the static ArcInner used for empty Arc<str/CStr/[T]> as returned by Default::default.

UniqueArcUninit 🔒

A unique owning pointer to an ArcInner that does not imply the contents are initialized, but will deallocate it (without dropping the value) when dropped.

Weak

Weak is a version of Arc that holds a non-owning reference to the managed allocation.

WeakInner 🔒

Helper type to allow accessing the reference counts without making any assertions about the data field.

UniqueArcExperimental

A uniquely owned Arc.

Constants

INTERNAL_OVERFLOW_ERROR 🔒

The error in case either counter reaches above MAX_REFCOUNT, and we can panic safely.

MAX_REFCOUNT 🔒

A soft limit on the amount of references that may be made to an Arc.

MAX_STATIC_INNER_SLICE_ALIGNMENT 🔒

Statics

STATIC_INNER_SLICE 🔒

Traits

ArcEqIdent 🔒

ArcFromSlice 🔒

Specialization trait used for From<&[T]>.

ToArcSlice 🔒

Specialization trait used for collecting into Arc<[T]>.

Functions

arcinner_layout_for_value_layout 🔒

Calculate layout for ArcInner<T> using the inner value’s layout

data_offset 🔒 ^⚠

Gets the offset within an ArcInner for the payload behind a pointer.

data_offset_align 🔒