What am I allowed to do with the send/receive callables?

[Hawk777]

What am I allowed to do with the send/receive callables?

[andrewgodwin]

1 is fine, 2 is not as it is outside of the return of the main application callable so the spec has those covered.

3 and 4 won't work as the other thread won't have the same event loop as event loops are basically thread-bound, and I don't believe you can cross things over between event loops like that.

5 is perfectly fine (calling send() a lot is kind of encouraged by the spec). 6 is legal in the same way 1 is, but doesn't seem very useful.

All the situations you've mentioned are thus basically covered already; I don't see a lot of value in expanding on this much further as the only thing that's really questionable here is 4, and if you've got to those lengths then you should know perfectly well not to do that!