> Antoine, can you please elaborate the rationale of your patch?
The patch adds SSL support for proactor-based event loops (any event loop supporting plain sockets, actually, so it could also work for libuv etc.).
> Is the "legacy" code only used on Python 3.4 and older? Is ssl.MemoryBIO always present in Python 3.5 and newer?
Yes and yes.
> I would like to see benchmarks of memory BIO vs current code on Linux and Windows.
Do you have such benchmarks?
> Maybe we may only use memory BIO for the proactor event loop?
It sounds better to exercise the same code path under all platforms.
> Did you try your patch on Python 3.3?
No.
> How will this patch help to support STARTTLS?
Guido explained this one :-)