atomic_once_cell 0.1.2

Thread-safe and lock-free OnceCell and Lazy
Documentation

atomic_once_cell provides two new types, [AtomicOnceCell] and [AtomicLazy], which are thread-safe and lock-free versions of [core::lazy::OnceCell] and [core::lazy::Lazy] suitable for use in #[no_std] environments.

Blocking

Both types can be used in a non-blocking way, but there are some blocking calls that should not be used from interrupt handlers or other contexts where blocking will lead to a deadlock. Blocking is based on crossbeam::utils::Backoff, and will be reduced to a spin lock in #[no_std] environments.

Examples

AtomicOnceCell

use atomic_once_cell::AtomicOnceCell;

static CELL: AtomicOnceCell<String> = AtomicOnceCell::new();

fn main() {
CELL.set("Hello, World!".to_owned()).unwrap();

assert_eq!(*CELL.get().unwrap(), "Hello, World!");
}

AtomicLazy

use atomic_once_cell::AtomicLazy;

static LAZY: AtomicLazy<String> = AtomicLazy::new(|| "Hello, World!".to_owned());

fn main() {
assert_eq!(*LAZY, "Hello, World!");
}