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)]

use core::sync::atomic::Ordering;

use atomic_float::AtomicF32;

static V: AtomicF32 = AtomicF32::new(0.0);

fn f(arg: u32) {
    rt::task::drop_privilege();

    let mut x = 0.0f32;
    let a = arg as f32;
    loop {
        x += a;
        V.store(x, Ordering::Relaxed);
        rt::task::yield_now();
    }
}

fn timeout() {
    rt::task::drop_privilege();
    rt::task::sleep(100);
    V.load(Ordering::Relaxed);
    rt::exit();
}

const STACK_SIZE: usize = rt::stack::FP_MIN.next_power_of_two();

rt::task!(f(1), STACK_SIZE, 1);
rt::task!(f(2), STACK_SIZE, 1);
rt::task!(timeout, rt::stack::MIN, 0);