"Programming in D" book, Parallelism chapter

[David]

You mentioned tasks, what I was missing a bit is taskPool.put, since 
Task.executeInNewThread creates a new internal Pool, which is not what 
always want. Then would be interesting how you check, if the pool's 
tasks have all finished (I didnt find any method doing this, to emulate 
this, I used an internal task-counter together with callbacks, but this 
doesnt allow me to check for exceptions ...).