Linked by Thom Holwerda on Tue 13th Oct 2009 18:24 UTC, submitted by Lazarus
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Member since:
2006-07-15
OS X kernel is based on Mach _and_ BSD/FreeBSD kernel.
"I'd be a bit cautious about saying XNU is a Mach kernel. XNU is not a microkernel, but it contains a lot more Mach code than FreeBSD does. However, XNU contains massive amounts of FreeBSD code, including countless IPC models, security parts, VFS, network stack, distributed file systems, etc. Saying that "Mac OS X is just FreeBSD with an Apple GUI" is certainly false on face value, but it's not correct to say that the kernel isn't in significant part FreeBSD-derived."
from Robert Watson (FreeBSD)
http://lists.freebsd.org/pipermail/freebsd-advocacy/2008-August/003...