Chapter 1: OS Basics | 🗒️ Ben's Notes

Q1.1. Consider a modern web browser (such as Chrome or Firefox) which plays a similar role to an operating system. What considerations does a web browser need to make as a referee, illusionist, and glue? The OS uses the four abstractions below to fulfill its roles: Threads and processes will be covered in depth in future sections. One of the major requirements of an operating system is to provide protection from buggy or malicious programs. A design paradigm that allows for this is the operating system kernel, which is a fully trusted platform operating at the lowest software level of the system. This has several benefits: The kernel is only a small portion of the entire operating system, since it is often beneficial to treat system libraries as user programs to allow for safer implementation. In order to provide protection, the kernel separates instructions into two main modes of execution: kernel mode (protected), and user mode (normal program execution). The mode is represented as a

Q1.1. Consider a modern web browser (such as Chrome or Firefox) which plays a similar role to an operating system. What considerations does a web browser need to make as a referee, illusionist, and glue? The OS uses the four abstractions below to fulfill its roles: Threads and processes will be covered in depth in future sections. One of the major requirements of an operating system is to provide protection from buggy or malicious programs. A design paradigm that allows for this is the operating system kernel, which is a fully trusted platform operating at the lowest software level of the syst