22 Oct
2018
22 Oct
'18
2:59 p.m.
Some corrections related to Mach and Apple.
TTFN - Guy
On Oct 22, 2018, at 2:40 PM, Jim Manley via cctalk
<cctalk at classiccmp.org> wrote:
BTW, MacOS X is based on Mach, the version of Unix that was designed for
multiple, closely-coupled processors, and it, too, uses X as a basis for
its GUI.
No. Mach is a microkernel based system that split apart BSD into ?kernel?
portions and Unix portions. It really didn?t have anything to do with SMP as
the premise behind Mach (which was a furthering of Accent) was message
passing between tasks. I can dig up the original papers if anyone is interested. ;-)
OS X does *not* use X as the basis of its GUI. It stems from NEXT which
used display postscript (modern OS X uses display PDF). An (optional)
X server (and clients) can be added to the OS (I use them all the time) but
is not part of the base install which belies the comment of X as the basis of
the GUI.
BTW, the X server on OS X, interfaces not to the bit-map but instead to the
native OS X display rendering framework.
TTFN - Guy