Here's a 9 year old ticket referencing freebsd5.1...

https://code.djangoproject.com/ticket/2052

On Wednesday, January 28, 2015 at 8:51:16 AM UTC-5, Tim Graham wrote:
>
> As far back as Django 1.4 (didn't check earlier), we use both these 
> patterns in the code:
>
> import threading
>
> try:
>     import threading
> except ImportError:
>     import dummy_threading as threading
>
> We also have logic in tests to skip if threading isn't available, however, 
> I can't believe that Django is usable without threading given we use the 
> first style of import (without a fallback) in many places 
> (db.models.loading, db.utils, test.testcases, + more).
>
> Docs say: 
>
> "The dummy_threading 
> <https://docs.python.org/2/library/dummy_threading.html#module-dummy_threading>
>  
> module is provided for situations where threading 
> <https://docs.python.org/2/library/threading.html#module-threading> 
> cannot be used because thread 
> <https://docs.python.org/2/library/thread.html#module-thread> is missing."
> https://docs.python.org/2/library/threading.html
>
> "The [thread] module is optional. It is supported on Windows, Linux, SGI 
> IRIX, Solaris 2.x, as well as on systems that have a POSIX thread (a.k.a. 
> “pthread”) implementation."
> https://docs.python.org/2/library/thread.html#module-thread
>
> This doesn't answer the question of what systems it *is* needed on. Unless 
> there's an objection, I think we can remove dummy_threading fallbacks?
>

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