Add support for synchronous event loops

[tzickel]

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The same principle that exists in the asynchronous world, exists in the synchronous world as well.

I've been bitten enough by gevent's monkey patching, that I think that if library writers had an option to detect a code is running via a greenlet or normal (threaded?), it could create code that automatically knows which primitives to use.

@jamadden This could make libraries like this (which is the basis of httpx) auto detect and use gevent as well (without monkey patching) ? https://github.com/encode/httpcore/tree/master/httpcore/_backends

[agronholm]

I just don't understand how this would make the code manifest the necessary await etc. statements. Enlighten us please?

[graingert]

there's also the case for twisted in greenlet or asyncio in greenlet (and them both), eg running async sqlalchemy on pytest-twisted

[tzickel]

I do not understand how gevent is related to async/await. As said in the OP, I would like the option for sniffio to be able to report synchronous event loops such as running inside a greenlet. Then when writing for example a sync library like redis-py it could query if it's running under a greenlet and do different code instead of using regular I/O (thus not requiring monkey patching).

[agronholm]

Ah, I got confused. Nevermind!