gistfile1.rs

static mut my_global_data: Option<MyData> = None;

// Do this before launching any threads
fn init() {
    unsafe { my_global_data = Some(load()); }
}

// The ref this returns isn't actually safe because it could be mutated away.
// As long is MyData is deeply immutable though there shouldn't otherwise be a data race here.
fn <'a>get_data() -> &'a MyData {
    unsafe {
        transmute(my_global_data.as_ref().unwrap())
    }
}