macos is not developed based on linux; macos is a graphical operating system developed based on the XNU hybrid kernel. The XNU operating system kernel is part of the Darwin operating system, and is also the operating system kernel of iOS, tvOS and watchOS. It is "X is Not Unix".
#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.
macos is not developed based on linux
macOS is a set of computers developed by Apple that runs on the Macintosh series of computers operating system on. macOS is the first commercially successful graphical user interface operating system.
macOS is a graphical operating system based on the XNU hybrid kernel, which is generally an operating system that cannot be installed on an ordinary PC. There is also macOS (Hackintosh) running on PC online.
What is XNU?
XNU is an operating system kernel developed by Apple Computer for the masOS operating system. It is part of the Darwin operating system. Is the iOS, tvOS and watchOS operating system kernel. XNU is the abbreviation of X is Not Unix.
XNU was first developed by NeXT Company for the NeXTSTEP operating system. It is a hybrid kernel (Hybrid kernel) that combines the characteristics of both the macro kernel and the microkernel in order to have the advantages of both kernels, such as improving the modularity of the operating system in the microkernel and making the operating system more flexible. A message passing mechanism that partially accepts memory protection, and macro kernels for high performance under heavy load.
Mainly consists of 4 parts:
Mach: The core of Mach is the message mechanism, which mainly implements basic processes, virtual Memory management, task scheduling, process communication and message mechanism.
BSD: Encapsulation and extension of the Mach layer.
libkern I/O Kit
libkern is an included C library that provides support and base classes for the C runtime. I/O Kit is a device driver framework written in C that allows developers to quickly create stable and elegant drivers.
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