nie, nepouziva scheduler z freebsd

Darwin is built around XNU, a hybrid kernel that combines the Mach 3 microkernel, various elements of FreeBSD 5 (including the process model, network stack, and virtual file system), and an object-oriented device driver API called I/O Kit.[1]

Some of the benefits of this choice of kernel are the Mach-O binary format, which allows a single executable file (including the kernel itself) to support multiple CPU architectures, and the mature support for symmetric multiprocessing in Mach.