I'm no expert, but you might find the BeBook, which "...details the Application Programming Interface (API) to the BeOS operating system," to be an informative

I'm no expert, but you might find the BeBook, which "...details the Application Programming Interface (API) to the BeOS operating system," to be an informative starting point (though you won't find a comparison with Linux there). There are chapters on "Threads and Teams" in the two sections on the "Kernel Kit" (that's as far as I looked, maybe other parts of the book would be more informative). https://www.haiku-os.org/legacy-docs/bebook/ https://www.haiku-os.org/legacy-docs/bebook/