General wait on non-io

[ming1]

Hello,

tokio-uring provides lots of async APIs for dealing with async IO, is there any way to deal with async non-IO?

For example, there is one tokio-uring application in which some data(meta) needs to be cached. More than one tasks need to check
and use the cache:

1. if the cache is update(read from FS), just use it, there isn't any
   await involved.

2. if the cache doesn't exist, call async_read().await

3. if the cache IO(async_read()) has been started, but not completed yet, how to implement await, so that when the in-flight cache read is completed, this task gets notified.

Thanks,