[Python-Dev] Issue #10348: concurrent.futures doesn't work on BSD

[Antoine Pitrou]

> > I'm not sure concurrent.futures is the culprit, rather than
> > multiprocessing itself (or perhaps even some core Python functionality).
> > Actually, the threading-based part of concurrent.futures probably works
> > fine.
> 
> Well, "the culprit" really is FreeBSD. However, concurrent.futures
> apparently makes freehanded use of semaphores, in a way that the
> FreeBSD authors didn't expect them to be used (if they expected them
> to be used at all, that is).

It seems to be multiprocessing as much as concurrent.futures itself.
Apparently a basic multiprocessing queue already uses two (interprocess)
locks and one semaphore.

And, again, the threading-based API in concurrent.futures should work
fine anyway. Do you suggest we selectively disable the process-based
API?

Regards

Antoine.