irondash_run_loop 0.6.0

Consistent, platform-independent interface to system run loop.
Documentation 
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use std::sync::{Arc, Condvar, Mutex};

pub struct BlockingVariable<T: Send> {
    state: Arc<(Mutex<Option<T>>, Condvar)>,
}

// Derive(Clone) doesn't work with Arc if T is not Clone
impl<T: Send> Clone for BlockingVariable<T> {
    fn clone(&self) -> Self {
        Self {
            state: self.state.clone(),
        }
    }
}

impl<T: Send> BlockingVariable<T> {
    pub fn new() -> Self {
        Self {
            state: Arc::new((Mutex::new(None), Condvar::new())),
        }
    }

    pub fn set(&self, v: T) {
        let mut lock = self.state.0.lock().unwrap();
        lock.replace(v);
        self.state.1.notify_all();
    }

    pub fn get_blocking(&self) -> T {
        let mut lock = self.state.0.lock().unwrap();
        while lock.is_none() {
            lock = self.state.1.wait(lock).unwrap();
        }
        lock.take().unwrap()
    }
}