Trc

Trc is a biased reference-counted smart pointer for Rust that allows for interior mutability. Trc is a smart pointer for sharing data across threads is a thread-safe manner without putting locks on the data. Trc stands for: Thread Reference Counted It implements biased reference counting, which is based on the observation that most objects are only used by one thread. This means that two refernce counts can be created: one for thread-local use, and one atomic one (with a lock) for sharing between threads. This implementation of biased reference counting sets the atomic reference count to the number of threads using the data.

When a Trc is dropped, then the thread-local reference count is decremented. If it is zero, the atomic reference count is also decremented. If the atomic reference count is zero, then the internal data is dropped. Regardless of wherether the atomic refernce count is zero, the local Trc is dropped.

For ease of developer use, Trc comes with Deref and DerefMut implemented to allow internal mutation.

Example in a single thread:

use trc::Trc;
let mut trc = Trc::new(100);
println!("{}", *trc);
*trc = 200;
println!("{}", *trc);

Example with multiple threads:

use std::thread;
use trc::Trc;

let trc = Trc::new(100);
let mut trc2 = trc.clone_across_thread();

let handle = thread::spawn(move || {
    println!("{}", *trc2);
    *trc2 = 200;
});

handle.join().unwrap();
println!("{}", *trc);
assert_eq!(*trc, 200);

See https://docs.rs/trc/latest/trc/ for the latest docs.