Customer Reviews

Operating System Design: The Xinu Approach (Macintosh Edition)

5 star:		(6)
4 star:		(1)
3 star:		(0)
2 star:		(0)
1 star:		(1)

 

 

This book does what no nother OS book has attempted: walk the reader through the implementation of a complete operating system from the hardware up. The full source code for the complete OS is included.

While this book does not cover many of the more advanced concepts (including virtual memory and memory protection; the hardware considered does not support such features) it does successfully demonstrate how the whole system fits together. The book is very accessible and is suitable for readers who have only application-level programming experience.

I strongly recommend reading this book cover to cover and then purchasing a more advanced book (such as _Modern Operating Systems_ by Tanenbaum) as a reference to sophisticated features.

For the most part this book is informative. If you have no idea of how a basic Operating System functions, or what it's responsibilities are, then this book will definitely clue you in. However, this book seemed to fall short of what the writers promised. For example, the version of XINU described in this book boots from DOS. I am suspicious of any operating system that boots from another operating system and then uses the services of it...it reminds me of Microsoft Windows 3.1. The OS also uses and relies on some of the PC's BIOS routines and services. While that technique makes the OS portable on different PCs, it limits its use only to PCs and hides a lot of operations that (in my opinion) should be shown. After reading it a few times, I found that the book was quite helpful after all. The OS has been ported to many other CPU's. The full source code can be found on the internet. The OS is quite powerful but still is simple (I was able to port the code to run on a 68010 project of mine; seeing the ported versions and the book's theory was enough to guide me). A decent book, it doesn't describe an operating system 'from the ground up', but comes close to it. Sure there are other operating systems out there with open source, but how many of those tell you what each function of the code does and what role these functions play in a OS?

Xinu is a beautiful OS and this book is a very
readable description of Xinu. Xinu with its threads
and micro kernel architecture is very suitable for
embedded applications and it has TCP/IP stack too.
Xinu is not a toy OS or even merely an
educational OS. I personally ported Xinu to an R3041
(MIPS) based board for an industrial application and
it worked very well. Hats off to Comer and others at
Purdue for giving Xinu to the world.

The text provides insight into the structure of many OS's, which can easily be used to understand other systems. It's clear and simple to understand, even though it's circa 1983! A must have for anyone working with embedded OS. Search the web for full source, which is readily available. The section on drivers and interfacing is especially usefull.

Embedded processor are becoming more powerfull and popular. Even a small embedded processor can compete with the first PC's. Because of this, there is a great demand for OS's for these processors. This is were Xinu comes in (Full multitasking kernel, filesystem, semaphores, timers, device drivers...) and best of all, it is not resource hungry (<12k flash with a minimum of 4K ram).

Bottom line is that this is an excellent book to teach you the basic's of OS's. This book is worth having..

This book explains the core concepts of operating system development in great detail. This is an excellent read and the source code is actually readable. This helped me out a *ton* when learning about multi-tasking.

I'd recommend this book to CS majors, hobby/homebrew operating system developers, and anyone with an interest of how operating systems work and how they are developed.

I also recommend the next volume of this book (Inter-Networking).

This book is a college-level text that explains and documents XINU, a compact, robust operating system. The code for every function appears in the book embedded in explanatory text. The author exposes his design choices and the reasons behind them. Exercises encourage thinking about alternative methods and added features. I used XINU for a very demanding real-time system. I found it to be capable and robust. The superb documentation found in the book gave confidence to write several device drivers for some peculiar peripherals. This the best of the dozen or so books on operating systems that I've read.

This book focuses exclusively on XINU, the OS written mainly by Comer. I will say this book is useful in the time when there was no open source, decent OS, however with the advent of Linux, I can't see any reason to study XINU anymore. Although XINU has most of the functions a modern OS should possess, there is essentially NO application written for this OS and it is only used by a handful of universities in their OS courses(for example, Purdue University, WL). If you really want to learn OS, I would recommend you to learn Linux which has relatively superior documentations(and is far more useful and stable than XINU). Some universities also used other experimental OSs like Nachos. I know nothing much on these OSs, therefore I make no comments.

Some people might argue Linux is far too complex and intimidating for beginners to study, well this is true in view of the current Linux kernel, however the instructor should be able to remove the superfluous components in the kernel. The basic kernel is not hard to comprehend at all.