Return value for joinThread?

[planetis]

What's the "old ways" of threading? Haven't you see benchmarks, where creating 
and joining threads was slower than single threaded? None ever done it that 
way. If you have a long running thread and don't want to use a threadpool then 
the solution is to use a synchronization primitive. There are a few in 
<https://github.com/planetis-m/sync/>