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::sem!(SEM);

fn poster() {
    rt::task::drop_privilege();
    for _ in 0..N {
        rt::task::sleep(5);
        SEM.post();
    }

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

fn waiter() {
    rt::task::drop_privilege();
    for _ in 0..N {
        assert!(SEM.timed_wait(10), "wait timed out");
    }

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

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

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