Your problem is that the return context (scalar/array/void) of the thread subroutine, is defined by the context in which that thread is created.
In your example, that means here:
Which is a scalar context. Hence, when the return is invoked here:
It is the equivalent of
And when that string is returned from the join and assigned to the hash in the calling code:
A complicated explanation, but thankfully, the solution is simple. Change the thread creation line to:
Which puts the creation of the thread into an array (list) context.
Now the code will run warnings free and produce the desired result:
Alternatively, you can mark the return context of the thread sub explicitly at creation time:
which will achieve the same result. See the section labelled "THREAD CONTEXT" in the threads pod for details.
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