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Thanks a lot for the feedback. The thinking was to use a stand-alone (even testable) construct with dependencies made explicit. For example, it wasn't obvious that the current iterator depended on forever, or whether the args_tuple parameter was a necessary part of it. But I agree it should be simplified.
Here is a simpler patch, keeping iterator semantics. My preference is to avoid adding lock semantics and additional complexity directly to main(), even though doing so would permit a smaller patch.