crack 0.1.0

verify distributed and lock-free algorithms through symbolic execution
Documentation 
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use std::sync::RwLock;
use std::thread;
use std::time::Duration;

use time;

pub trait Clock {
    fn now(&self) -> time::Timespec;
    fn sleep_ms(&self, ms: u64);
}

pub struct RealClock;

unsafe impl Sync for RealClock {}

impl Clock for RealClock {
    fn now(&self) -> time::Timespec {
        time::now().to_timespec()
    }

    fn sleep_ms(&self, ms: u64) {
        thread::sleep(Duration::from_millis(ms))
    }
}

pub struct TestClock {
    inner: RwLock<time::Timespec>,
}

impl TestClock {
    pub fn new() -> TestClock {
        TestClock { inner: RwLock::new(time::Timespec { sec: 0, nsec: 0 }) }
    }
}

impl Clock for TestClock {
    fn now(&self) -> time::Timespec {
        let inner = self.inner.read().unwrap();
        *inner
    }

    fn sleep_ms(&self, ms: u64) {
        let mut inner = self.inner.write().unwrap();
        let ns = (ms % 1_000_000) * 1_000_000;
        inner.nsec += ns as i32;
        if inner.nsec > 1e9 as i32 {
            inner.sec += (inner.nsec / 1e9 as i32) as i64;
            inner.nsec = (inner.nsec % 1e9 as i32) as i32;
        }
    }
}