fast-steal 2.2.2

特别快的多线程库，支持超细颗粒度的任务窃取
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# fast-steal 神偷


![GitHub last commit (branch)](https://img.shields.io/github/last-commit/share121/fast-steal/master)
[![Rust](https://github.com/share121/fast-steal/workflows/Test/badge.svg)](https://github.com/share121/fast-steal/actions)
[![Latest version](https://img.shields.io/crates/v/fast-steal.svg)](https://crates.io/crates/fast-steal)
[![Documentation](https://docs.rs/fast-steal/badge.svg)](https://docs.rs/fast-steal)
![License](https://img.shields.io/crates/l/fast-steal.svg)

`fast-steal` 是一个特别快的多线程库，支持超细颗粒度的任务窃取。

## 优势


1. 零依赖
2. 无锁
3. 零拷贝
4. 安全的 Rust 代码
5. no_std 支持，不依赖于标准库
6. 超细颗粒度任务窃取，速度非常快

```rust
use fast_steal::{spawn::Spawn, task_list::TaskList};
use std::{
    collections::{HashMap, hash_map::Entry},
    sync::{Arc, mpsc},
    thread,
};

fn fib(n: usize) -> usize {
    match n {
        0 => 0,
        1 => 1,
        _ => fib(n - 1) + fib(n - 2),
    }
}

fn fib_fast(n: usize) -> usize {
    let mut a = 0;
    let mut b = 1;
    for _ in 0..n {
        (a, b) = (b, a + b);
    }
    a
}

fn main() {
    let tasks: Arc<TaskList> = Arc::new(vec![0..48].into());
    let (tx, rx) = mpsc::channel();
    let tasks_clone = tasks.clone();
    let handles = tasks.clone().spawn(
        8,
        |closure| thread::spawn(move || closure()),
        move |task, get_task| {
            loop {
                while task.start() < task.end() {
                    let i = tasks_clone.get(task.start());
                    tx.send((i, fib(i))).unwrap();
                    task.fetch_start(1);
                }
                if !get_task() {
                    break;
                }
            }
        },
    );
    // 汇总任务结果
    let mut data = HashMap::new();
    for (i, res) in rx {
        // 如果重复计算就报错
        match data.entry(i) {
            Entry::Occupied(_) => {
                panic!("数字 {i}，值为 {res} 重复计算")
            }
            Entry::Vacant(entry) => {
                entry.insert(res);
            }
        }
        data.insert(i, res);
    }
    // 等待任务结束
    for handle in handles {
        handle.join().unwrap();
    }
    // 验证结果
    dbg!(&data);
    for i in 0..tasks.len {
        let index = tasks.get(i);
        assert_eq!((index, data.get(&index)), (index, Some(&fib_fast(index))));
    }
}
```