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Linux Kernel Programming

You're reading from   Linux Kernel Programming A comprehensive and practical guide to kernel internals, writing modules, and kernel synchronization

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Product type Paperback
Published in Feb 2024
Publisher Packt
ISBN-13 9781803232225
Length 826 pages
Edition 2nd Edition
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Author (1):
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Kaiwan N. Billimoria Kaiwan N. Billimoria
Author Profile Icon Kaiwan N. Billimoria
Kaiwan N. Billimoria
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Table of Contents (16) Chapters Close

Preface 1. Linux Kernel Programming – A Quick Introduction 2. Building the 6.x Linux Kernel from Source – Part 1 FREE CHAPTER 3. Building the 6.x Linux Kernel from Source – Part 2 4. Writing Your First Kernel Module – Part 1 5. Writing Your First Kernel Module – Part 2 6. Kernel Internals Essentials – Processes and Threads 7. Memory Management Internals – Essentials 8. Kernel Memory Allocation for Module Authors – Part 1 9. Kernel Memory Allocation for Module Authors – Part 2 10. The CPU Scheduler – Part 1 11. The CPU Scheduler – Part 2 12. Kernel Synchronization – Part 1 13. Kernel Synchronization – Part 2 14. Other Books You May Enjoy
15. Index

Organizing processes, threads, and their stacks – user and kernel space

The traditional UNIX process modelEverything is a process; if it’s not a process, it’s a file – has a lot going for it. The very fact that it is still the model followed by operating systems after a span of over five decades amply validates this. Of course, nowadays, the thread is considered the atomic execution context; a thread is an execution path within a process. Threads share all process resources, including the user VAS, open files, signal dispositions, IPC objects, credentials, paging tables, and so on, except for the stack. Every thread has its own private stack region (this makes perfect sense; if not, how could threads truly run in parallel, as it’s the stack that holds execution context).

The other reason we focus on the thread and not the process is made clearer in Chapter 10, The CPU Scheduler – Part 1. For now, we shall just say this: the thread...

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