"This morning, Jim Magee, member of Apple's Mach kernel
development team, gave a very interesting talk on the Mac OS X
kernel. The session, which spanned literally all areas of the
undercarriage, focused on the Mach kernel in Mac OS X, and how
Apple has reinforced Mach both from the Mach 3.0 "standard" as well
as Mac OS X Server and its 2.5 kernel."
"One of the more signficant statements of the session came
when Magee told the audience that the Mach kernel and the BSD layer
which lays upon it are inseparable. "Every application [that runs
in Mac OS X] is a BSD application," said Magee. "You can't keep the
system running without the Mach kernel and the BSD layer."
This quashes the public rumour that Apple will be able to ship a
"lite" version of Mac OS X which will contain only the smallest
possible bit of BSD, or another that questions Apple reluctance to
move its tools to Linux."
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