Unnamed repository; edit this file 'description' to name the repository.
Auto merge of #3712 - tiif:feat/epoll, r=oli-obk
Implement epoll shim
This PR:
- implemented non-blocking ``epoll`` for #3448 . The design for this PR is documented in https://hackmd.io/`@tiif/SJatftrH0` .
- renamed FileDescriptor to FileDescriptionRef
- assigned an ID to every file description
