Arc
Arc is Rust’s atomically reference-counted smart pointer for shared ownership of a value across threads.
Code Like a Pro in Rust
Arc is a Rust thread-safe reference-counted smart pointer for shared ownership of a value across threads.
- How it is used
- Enables shared ownership across threads and appears in a parallel-test counter.
- How deep it goes
- Explains reference-count changes and atomic cost, then works through global initialization; stops short of implementing Arc.
- Examples
- Uses a parallel-test counter, compiler errors, `Arc::clone`, and `lazy_static!` to expose an initialization pitfall.
- What you can do after
- Apply it via Rust's `Arc` when ownership crosses threads, choosing synchronization or clone-on-write separately.
Learn Rust in a Month of Lunches
Arc is Rust's atomically reference-counted smart pointer for sharing ownership of a value safely across threads.
- How it is used
- Shares ownership of values across threads while coordinating access through thread-safe types.
- How deep it goes
- Defines atomic operations and demonstrates cloning, locking, spawning, joining, and repeated shared-counter updates.
- Examples
- Uses Arc<Mutex<i32>> counters, two-thread increments, ten-thread loops, and helper functions that construct and clone Arcs.
- What you can do after
- Build shared counters with Arc, Mutex, spawned threads, cloned owners, and joined handles.
Related concepts
- Rcalternative to · Rc is Rust’s single-threaded reference-counted smart pointer for shared ownership of a value.
- smart pointerkind of · A smart pointer is a pointer-like object that manages or mediates access to a referenced resource, often providing ownership, lifetime, or safety behavior.
- atomicityuses · Atomicity is the property that an operation or group of operations takes effect as an indivisible, all-or-nothing unit, without observable partial effects.
- reference-counted pointerkind of · A reference-counted pointer is a pointer-like value whose referenced allocation is reclaimed when its tracked reference count reaches zero.
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