In reply to arun_ajs:
What makes it work is that for each iteration of the for loop, a local automatic variable is created with a lifetime that is extended by the lifetime of the fork/join_none block that references it. The statements inside the fork/join_none block begin execution after finishing the for loop. It doesn’t mater if the function/task call passes its arguments by value or by reference; each call has an independent copy of the automatic variable that was set to a value as the for loop went through its iterations.