How are theads, Tid and spawn related?

[Ali Çehreli via Digitalmars-d-learn]

On 11/01/2014 11:13 PM, Sean Kelly wrote:

 > Note that thread_joinAll is called automatically when main exits

Has that always been the case? I remember having to inject 
thread_joinAll() calls at the ends of the main()s of a couple of 
examples because of having trouble otherwise.

Can I safely remove thread_joinAll()s if they are the last lines in main()?

Ali