What's the proper way to spawn a task on current thread?

[RealXuChe]

I want to create a task in the current thread because I don't want to take the synchronization overhead. I tried the following code but ran into problems :

LocalSet::new().run_until(async move {
    some code  // It seems that until it returns.......
}).await;
more code  // Code here will not be executed?

The task started with run_until blocks the program from continuing, and the behavior I want is close to the initial spawn, which will execute two tasks simultaneously.

spawn(async move {
    some code // This.....
});
other code // .....and this will be executed simultaneously.

What's the proper way to spawn a task on current thread?

[Darksonn]

If all you are using is the LocalSet::run_until method, you should consider simply using tokio::join!. Both halves of a tokio::join! are part of the same task, so they will be executed together on the same thread.

If you do want to use a LocalSet, then you should probably be spawning both tasks on the LocalSet with its spawn_local method. You can then .await the LocalSet which completes once all tasks spawned on the set return.

[RealXuChe]

Maybe it's possible to start another current-thread runtime in a new thread and run these tasks?
But this doesn't sound practical enough, I should end up choosing the unsafe approach.
Thank you for your help!

[brandonros]

What's the equivalent of trying to join a JoinHandle from Tokio (async context) in non-async context?

fn main() {
  let thread_join_handle = std::thread::spawn(|| { ... })
  let result = thread_join_handle.join().unwrap()
}

kind of like this (non async main fn)

[Darksonn]

If you have a new unrelated question, please open a new thread for it.

[brandonros]

#3947 (reply in thread)
#4563 (reply in thread)
#3857 (reply in thread)

[Darksonn]

If you don't know how to open a new thread, then you can do so at this page: https://github.com/tokio-rs/tokio/discussions/new