macOS runs a BSD-like userland atop a Mach kernel. It's not Linux, but it is a damn sight more field-tested and reliable than the Windows kernel... I'm actuall

macOS runs a BSD-like userland atop a Mach kernel. It's not Linux, but it is a damn sight more field-tested and reliable than the Windows kernel... I'm actually surprised at the question, considering the number of devs who work on macOS (and I'm not talking about front-end folk).