use std::sync::RwLock;

struct MyStruct {
    value: String,
}

impl MyStruct {
    // other things that aren't thread-safe

    fn get_value(&self) -> &str {
        self.value.as_ref()
    }
}

struct MySyncStruct {
    my_struct: RwLock<MyStruct>
}

impl MySyncStruct {
    fn get_value(&self) -> &str {
        self.my_struct.read().unwrap().get_value()
    }
}

fn main() {
    let my_struct = RwLock::new(MyStruct {
        value: "test".to_owned()
    });

    let my_sync_struct = MySyncStruct { my_struct };
    let val = my_sync_struct.get_value();
}