Function spawn_in 

pub fn spawn_in<F>(
    runtime: &Handle,
    future: F,
) -> JoinHandle<<F as Future>::Output> 
where
    F: Future + Send + 'static,
    <F as Future>::Output: Send + 'static,

Available on crate feature dial9 only.

Spawn a traced task onto a specific runtime, from any thread.

Like [tokio::runtime::Handle::spawn], but the task’s polls are instrumented when runtime is dial9-traced. Unlike spawn, the calling thread need not belong to a dial9 runtime: instrumentation resolves on the target runtime’s worker at the task’s first poll. Spawning into an untraced runtime records nothing, the same as spawn on an untraced runtime.