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 rt::sync::event;

const N: i32 = 10;
rt::event!(EVENT);

const EVENT_A: u32 = 1 << 0;
const EVENT_B: u32 = 1 << 1;
const EVENT_C: u32 = 1 << 2;
const EVENT_D: u32 = 1 << 3;

fn setter() {
    rt::task::drop_privilege();
    for _ in 0..N {
        rt::task::sleep(3);
        EVENT.set(EVENT_A);
        rt::task::sleep(3);
        EVENT.set(EVENT_B);
        rt::task::sleep(4);
        EVENT.set(EVENT_C);
    }
    rt::task::sleep(20);
    EVENT.set(EVENT_A | EVENT_B | EVENT_C);
}

fn waiter_one_noclear() {
    rt::task::drop_privilege();
    const WAIT: u32 = EVENT_B | EVENT_D | event::WAIT_NOCLEAR;
    for _ in 0..N {
        let bits = EVENT.timed_wait(WAIT, 15);
        assert!(event::bits_match(bits, WAIT), "wait timed out");
    }
}

fn waiter_all() {
    rt::task::drop_privilege();
    const WAIT: u32 = EVENT_A | EVENT_B | EVENT_C | event::WAIT_ALL;
    for _ in 0..N {
        let bits = EVENT.timed_wait(WAIT, 15);
        assert!(event::bits_match(bits, WAIT), "wait timed out");
    }
    let bits = EVENT.timed_wait(WAIT, 10);
    assert!(!event::bits_match(bits, WAIT), "wait didn't time out");
    rt::exit();
}

const STACK_SIZE: usize = rt::stack::MIN * 2;

rt::task!(setter, STACK_SIZE, 2);
rt::task!(waiter_one_noclear, STACK_SIZE, 0);
rt::task!(waiter_all, STACK_SIZE, 1);