Better multithreading with D

[solidstate1991 via Digitalmars-d-learn]

In order to call a function multiple time at parallel (rendering 
function, very well parallelizable), but in order to push the CPU 
to it's limits I have to get some form of parallelization. 
Currently I'm using parallel foreach, which isn't very nice, and 
since it uses GC allocation that creates some performance impact 
from time to time.