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Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization

You're reading from   Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization Create user-kernel interfaces, work with peripheral I/O, and handle hardware interrupts

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Product type Paperback
Published in Mar 2021
Publisher Packt
ISBN-13 9781801079518
Length 452 pages
Edition 1st 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 (11) Chapters Close

Preface 1. Section 1: Character Device Driver Basics
2. Writing a Simple misc Character Device Driver FREE CHAPTER 3. User-Kernel Communication Pathways 4. Working with Hardware I/O Memory 5. Handling Hardware Interrupts 6. Working with Kernel Timers, Threads, and Workqueues 7. Section 2: Delving Deeper
8. Kernel Synchronization - Part 1 9. Kernel Synchronization - Part 2 10. Other Books You May Enjoy
Working with Kernel Timers, Threads, and Workqueues

What if the low-level specification for your device driver demands that, between the execution of func_a() and func_b(), there should be a 50-millisecond delay? Furthermore, depending on your circumstances, the delay should work when you're running in either process or interrupt contexts. What if, in another part of the driver, you require a monitoring function of some sort to be executed asynchronously and periodically (say, every second)? Or do you need to have a thread (or several threads) silently performing work in the background but within the kernel?

These are very common requirements in all kinds of software, including our corner of the universe – Linux kernel module (and driver) development! In this chapter, you will learn how to set up, understand, and use delays while running in kernel space,...

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