Operating Systems Operating Systems - Winter 2012 Dr. Melanie Rieback [email protected]...

Operating Systems

Operating Systems - Winter 2012

Dr. Melanie Rieback

[email protected]

http://www.cs.vu.nl/~melanie/teaching/os.html

Design and Implementation

Vrije Universiteit Amsterdam

W&N, R4.33 – 8-7634

Course OverviewOperating Systems 2012

Vrije Universiteit Amsterdam Slide 1

• Classes are in:

• M6.07 on Tuesdays 15:30-17:15

• M6.23 on Thursdays 13:30-15:15

• Examination:

• Monday March 26 15:15-18:00

• Monday June 11 18:30-21:15

Course Overview


• In-Class Quizzes:

• Will be given on a surprise basis

• Are given at the beginning of class

• Can add up to 2(!) extra points to your grade

• But before you start celebrating:

• The questions will be hard

• This is a good way to gauge your progress during this course

• Will cover the material from the previous class

Operating Systems 2012

Structure of this Course



Chap 1 - Overview


• What is an Operating System?

• A Bit of History….

• Concepts

• System Calls

• Structure


A Bit of History



Linux (Lines of Code)



Linux vs. MINIX



*NIX Evolution



*NIX EvolutionOperating Systems 2010


What is an OS?



Abstraction over HW



2 Views on OSes


• OS as a Virtual Machine

• Extending the HW functionality

• Hides the messy details of programming the HW

• OS as a Resource Manager

• Protects against simultaneous usage of resources

• Fair sharing of resources (scheduling)

• Resource accounting


How to View an OSOperating Systems 2011


ProcessesOperating Systems 2011


Multiple ProcessesOperating Systems 2011


Files (1/2)Operating Systems 2011




Files (1/2)

Filesystem LayoutOperating Systems 2011


Files Concepts (1/2)Operating Systems 2011


Files Concepts (2/2)Operating Systems 2011


File System Mounting (1/2)Operating Systems 2011


File System Mounting (2/2)Operating Systems 2011


Special Files (1/2)Operating Systems 2011


Special Files (2/2)Operating Systems 2011


System CallsOperating Systems 2011


Hardware

Operating SystemSystem Calls

Libraries

Library functionsApplications

Instruction Set

Architecture

• System Calls are the interface the Operating System offers to

applications.• Problem: Mechanics of issuing a system call are highly machine

dependent• Solution: Provide a library to allow system calls from C programs

Process Management (1/2)Operating Systems 2011


Process Management (2/2)Operating Systems 2011


System Calls: SignalsOperating Systems 2011


System Calls: FilesOperating Systems 2011


System Calls: DirectoriesOperating Systems 2011


System Calls – Example (1/2)Operating Systems 2011


System Calls – Example (2/2)Operating Systems 2011


OS Structure: Monolithic (1/2)Operating Systems 2011


OS Structure: Monolithic (2/2)Operating Systems 2011


OS Structure: UNIXOperating Systems 2011


OS Structure: LinuxOperating Systems 2011


OS Structure: Windows 2000Operating Systems 2011


System Services

Windows

MGR

& GDI

Windows 2000 Kernel

Hardware Abstraction Layer (HAL)

IO

ManagerGraphics

Device

Drivers

VM

Manager

Security

Reference

Monitor

Process

Manager

Client / Server



Virtualization



Operating Systems Operating Systems - Winter 2012 Dr. Melanie Rieback [email protected]...

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