Concurrency Confusion

["岩倉 澪" via Digitalmars-d-learn]

On Tuesday, 4 August 2015 at 08:35:10 UTC, Dicebot wrote:
>     // in real app use `receiveTimeout` to do useful stuff until
>     // result message is received
>     auto output = receiveOnly!(immutable(Bar)[]);

New question: how would I receive a immutable value with 
receiveTimeout? I need the results from my worker thread outside 
of the delegate that receiveTimeout takes.

Also: what is the best way to kill off the worker thread when I 
close the application, without having to wait for the worker 
thread to complete? My first thought was to use receiveTimeout in 
the worker thread, but the work is being done in a parallel 
foreach loop, and I am not sure if there is a way to safely use 
receiveTimeout in a parallel situation...
I also found Thread.isDaemon in core.thread. I tried doing auto 
thread = Thread.getThis(); thread.isDaemon = true; at the start 
of the worker thread, but it still seems to wait for it to 
complete before closing.

Thanks again!