rt 0.19.1

A real-time operating system capable of full preemption
Documentation 
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#![no_main]
#![cfg_attr(target_os = "none", no_std)]

struct Point {
    x: u32,
    y: u32,
}

rt::rwlock!(POINT, Point, Point { x: 0, y: 0 });

fn reader() {
    rt::task::drop_privilege();
    loop {
        let p = POINT.read();
        assert_eq!(p.x, p.y, "point coordinates did not match");
    }
}

fn writer() {
    rt::task::drop_privilege();
    loop {
        let mut p = POINT.write();
        p.x += 1;
        p.y += 1;
        drop(p);
        rt::task::sleep(1);
    }
}

fn timeout() {
    rt::task::drop_privilege();
    rt::task::sleep(50);
    rt::exit();
}

const STACK_SIZE: usize = rt::stack::MIN * 8;

rt::task!(reader, STACK_SIZE, 1);
rt::task!(reader, STACK_SIZE, 1);
rt::task!(writer, rt::stack::MIN, 1);
rt::task!(timeout, rt::stack::MIN, 0);