actix_rt::main is not compatible with tokio block_on

[Guara92]

Trying to run async code from a sync function, with actix_rt::main the future never ending it's execution, with tokio::main it works without problems.

Example code:

use tokio::runtime::Handle;
use tokio::time::sleep;

#[actix_rt::main]
async fn main() {
    call_sync();
}

pub fn call_sync() {
    let handle = Handle::current();
    let five = std::thread::spawn(move || {
        handle.block_on(get_five_async())
    })
    .join()
    .unwrap();
    println!("{five:?}");
}

pub async fn get_five_async() -> i32 {
    sleep(core::time::Duration::from_millis(100)).await;
    5
}

I minimized the code where I actually have this problem, an actix-web endpoint where I'm trying to block waiting for a future to resolve, in the real code the future never runs even with tokio::main macro, I'm doing something wrong or there is a compatibility issue?

[Guara92]

I'll answer for myself, unfortunately this is not possible in a single-threaded runtime like actix-rt, the same problem also occurs with #[tokio::main(flavor="current_thread")].