I personally believe that in addition to what that has already been said, there are some issues with your code:

• it is a supposedly minimal snippet but it contains an unnecessary assignment to $r, which is not used afterwards;
• it contains a bare return outside of a sub which is a valid construct, but a suspect one as well, and not likely to do what that you want.

I guess we need to wait untill the loop finish the process and entire data in the memory. Instead of doing this, Is there any ways to return the array data then and there. Did you get my point?

Not at all... do you want to randomly return asynchronously copies of your array while it is being filled? It should be doable with threads, but... why so?!?

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