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How can MachTen be considered a real UNIX operating system when it is implemented on top of MacOS?

April 26, 2017implemented machten MacOS operating system Unix

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How can MachTen be considered a real UNIX operating system when it is implemented on top of MacOS?

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Even though MachTen gives the appearance of being just another Macintosh application, MachTen and MacOS operate very much like co-resident operating systems, sharing the processor. When MachTen has control, it pre-emptively multitasks UNIX applications; when MacOS has control, it runs the Macintosh applications using its cooperative sharing. There is a slide bar Control Panel that lets you prioritize UNIX processing over Macintosh processing.