Function ranagrams::factory::manufacture

pub fn manufacture<I, W>(
    roster: usize, 
    slop_factor: usize, 
    materials: Vec<I>, 
    fun: Arc<W>
) -> (Receiver<Option<I>>, Arc<AtomicBool>) where
    I: Send + 'static,
    W: WorkerFun<I>, 

Start the factory going. The roster is the number of workers. The slop_factor is multiplied by this number to determine the number of items to keep in reserve for workers that run low in their personal work queues. The materials are the initial items requiring improvement. The fun provides the specifications for what the workers will do to improve or inspect their work.