In case anyone else encountered this problem. You have to edit your function and check the "has return value" box. Then your return will work. After this you have to use "Call Function" again and now you have a new field for saving results.
Specific function for each thread
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@hifive,
Example # 1 splitting threads into 2 functions action_test1.xml.
Example # 2 splitting threads into any number of functions action_test2.xml.
