Raise error for code that risk deadlock (#32295)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32295
Fix for https://github.com/pytorch/pytorch/issues/32045
Calling into the engine with the GIL can deadlock because:
- worker thread initialization acquires the GIL
- Any Node / hook can be a python function that will acquire the GIL
The choice was made here to raise an error as one of the advantage of using cpp extensions with python is to be able to release the GIL. So we prefer to educate users to do it rather than doing it under the hook.
Test Plan: Imported from OSS
Differential Revision: D19430979
Pulled By: albanD
fbshipit-source-id: e43f57631885f12e573da0fc569c03a943cec519
