Function block_on 

pub fn block_on<F: Future>(fut: F) -> F::Output

Run a future to completion using a busy loop.

This calls .poll() on the future in a busy loop, which blocks the current thread at 100% cpu usage until the future is done. The future’s Waker mechanism is not used.

You can use this to run multiple futures concurrently with join.

It’s suitable for systems with no or limited concurrency and without strict requirements around power consumption. For more complex use cases, prefer using a “real” executor like embassy-executor, which supports multiple tasks, and putting the core to sleep when no task needs to do work.