parc

This crate exposes ParentArc<T> which is comparable to an Arc<T> but "strong" references cannot be cloned. This allows the ParentArc<T> to lock its weak references and block until all strong references are dropped. Once it is the only reference it can be consummed safely.

Usage

This crate is compatible with #![no_std] environnement that provides an allocator.

toml [dependencies] parc = features{version="1", default-features = false} # for no_std

Example

```rust use parc::ParentArc; use std::thread; use std::sync;

fn main() { let m = ParentArc::new(sync::Mutex::new(0));

let mut vh = Vec::new();
for _ in 0..10 {
    let h = thread::spawn({
        let weak = ParentArc::downgrade(&m);
        move || loop {
            match weak.upgrade() {
                Some(mutex) => *mutex.lock().unwrap() += 1,
                None => break,
            }
        }
    });
    vh.push(h);
}

let _: sync::Mutex<usize> = m.block_into_inner();
for h in vh {
    let _ = h.join();
}

} ```