Async to Sync processing

[tbulensOpen]

Hi, I been a Java/Groovy developer for many years. I am starting to learn python on my own.
I am experimenting on having an Async http server firing off a Synchronous process.
For example:
1) Http server receives a request to start Email download poller
2) Check to see if already started, if not, fire off an asynchronous email download poller that keeps running until stop request is received. The poller fires off a synchronous email download, that connect and downloads attachments.
3) Http server receives a request to stop email download poller.
4) Stops the asynchronous email download poller.

I don't care about the email stuff, I really trying to figure out Async to Sync calls and understand the Async libraries and how they work. Do you know anyone that can present such a topic?
I would be interested in attending, hopefully others would be interested in this subject.

Ted
[email protected]

Thanks