1. Device Management & Deadlock
Operating Systems
Device Management
&
Deadlock
1) These notes are © Aiman Hanna. All copyrights reserved. For more information please to:
2) These notes are also based on: Operating System Concepts, 9th edition by Silberschatz/Galvin/Gagne, published by Wiley 2013, ISBN: | ISBN BRV: These notes still totally enforce all copyrights for Silberschatz/Galvin/Gagne & J. Wiley . For more information on these rights, please refer to the original publication of the book.
3) VERY IMPORTANT: These notes are neither complete nor sufficient to study for the course. They are merely given so that you can follow the covered subjects. You should NEVER depend solely on these notes for your study.
Any use of these notes that results in violation of any of the copyrights indicated above is strictly prohibited.
© Dr. Aiman Hanna
Department of Computer Science Concordia University Montreal, Canada
Data Communications & Computer Networking, by: Aiman Hanna

2. Optimizing Access to Magnetic Disks
FCFS
SSTF
Scan/Look
Circular Scan / Circular Look
Homing Instructions

3. Deadlock Why is Deadlock deadly? Resource Allocation Graph
What would a loop in the resource allocation graph indicate?
What if there are no loops?

4. Deadlock Needed Conditions for deadlock to occur Deadlock Prevention
Different ideas to violate one of the needed 4 conditions of deadlock and so prevent deadlock
Was any of these ideas possible?
Deadlock avoidance
Deadlock Detection & Handling
If none of the above is possible, what can an OS do?

5. Where is this week coverage in the textbook?
Device Management
Chapter 10: Section 10.1, 10.2, 103, 10.4 & 10.6
 Permanently Skip: 10.5, 10.7 & 10.8
Deadlock:
Chapter 7 – Entire chapter