[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2016-09-20.07:38:40]

Furthermore, add concurrency against callbacks such as "ReceivedInstanceFilter()", "IncomingHttpRequestFilter()" and "IncomingFindRequestFilter()", that should be fast and thus not be blocked by "On*()" events. This would require duplicating the Lua context.

https://orthanc.chu.ulg.ac.be/book/users/lua.html#callbacks-to-react-to-events