Multiple workers in Swift Command Line Tool

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I mistakenly interpreted the locking thread for a hanging program. The work will execute just fine without a run loop. The code in the question will run fine, and blocking the main thread until the whole group has finished.

So say chunks contains 4 items of workload, the following code spins up 4 concurrent workers, and then waits for all of the workers to finish:

let group = DispatchGroup()
let queue = DispatchQueue(label: "", attributes: .concurrent)

for chunk in chunk {
    queue.async(group: group, execute: DispatchWorkItem() {
        do_work(chunk)
    })
}

_ = group.wait(timeout: .distantFuture)

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