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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

Product type Book
Published in Mar 2021
Publisher Packt
ISBN-13 9781801079518
Pages 452 pages
Edition 1st Edition
Languages
Author (1):
Kaiwan N. Billimoria Kaiwan N. Billimoria
Profile icon Kaiwan N. Billimoria
Toc

Table of Contents (11) Chapters close

Preface 1. Section 1: Character Device Driver Basics
2. Writing a Simple misc Character Device Driver 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

Having your work task execute schedule_work()

Calling INIT_WORK() registers the specified work structure and function with the in-house default kernel-global workqueue. But it doesn't execute it yet! You have to tell it when to execute your "work" by calling the schedule_work() API at the appropriate moment:

bool schedule_work(struct work_struct *work);

Clearly, the parameter to schedule_work() is the pointer to the work_struct structure (which you initialized earlier via the INIT_WORK() macro). It returns a Boolean (quoting directly from the source): %false if @work was already on the kernel-global workqueue and %true otherwise True. In effect, schedule_work() checks if the function that was specified (via the work structure) is already on the kernel-global workqueue; if not, it enqueues it there; if it already was there, it leaves it alone in the same position (it doesn't add one more instance). It then marks the...

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