rayon 0.9.0

Simple work-stealing parallelism for Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

extern crate rayon;

/// Test that one can emulate join with `scope`:
fn pseudo_join<F, G>(f: F, g: G)
    where F: FnOnce() + Send,
          G: FnOnce() + Send,
{
    rayon::scope(|s| {
        s.spawn(|_| g());
        f();
    });
}

fn quick_sort<T:PartialOrd+Send>(v: &mut [T]) {
    if v.len() <= 1 {
        return;
    }

    let mid = partition(v);
    let (lo, hi) = v.split_at_mut(mid);
    pseudo_join(|| quick_sort(lo), || quick_sort(hi));
}

fn partition<T:PartialOrd+Send>(v: &mut [T]) -> usize {
    let pivot = v.len() - 1;
    let mut i = 0;
    for j in 0..pivot {
        if v[j] <= v[pivot] {
            v.swap(i, j);
            i += 1;
        }
    }
    v.swap(i, pivot);
    i
}

pub fn is_sorted<T: Send + Ord>(v: &[T]) -> bool {
    (1..v.len()).all(|i| v[i-1] <= v[i])
}

fn main() {
    let mut v: Vec<i32> = (0 .. 256).rev().collect();
    quick_sort(&mut v);
    assert!(is_sorted(&v));
}