Function spawn_blocking 

pub fn spawn_blocking<F, R>(func: F) -> JoinHandle<R> 
where
    F: FnOnce() -> R + Send + 'static,
    R: Send + 'static,

Spawns a blocking task onto the current runtime.

Returns a JoinHandle that can be awaited to get the task’s result.

Panics

• If no runtime is currently running