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)]

const N: i32 = 10;
rt::notify!(NOTE);

fn notifier() {
    rt::task::drop_privilege();
    for _ in 0..N {
        rt::task::sleep(5);
        NOTE.or(1);
    }

    rt::task::sleep(15);
    NOTE.post();
}

fn waiter() {
    rt::task::drop_privilege();
    for _ in 0..N {
        assert_eq!(
            NOTE.timed_wait_clear(1, 10).expect("wait timed out"),
            1,
            "wait returned the wrong value"
        );
    }

    assert!(NOTE.timed_wait(10).is_none(), "wait didn't time out");
    rt::exit();
}

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

rt::task!(notifier, rt::stack::MIN, 0);
rt::task!(waiter, STACK_SIZE, 0);