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)]

rt::once_lock!(CELL, usize);
rt::sem_binary!(SEM);

fn task0() {
    assert!(CELL.get().is_none());
    // Wait for task1 to set the value.
    SEM.wait();
    assert_eq!(CELL.get(), Some(&12345));
    rt::exit();
}

fn task1() {
    let value = CELL.get_or_init(|| 12345);
    assert_eq!(value, &12345);
    SEM.post();
}

rt::task!(task0, rt::stack::MIN, 0);
rt::task!(task1, rt::stack::MIN, 1);