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Operating System Design - Florida Atlantic Universitytami/COP4610M2Slides.pdf · Operating systems...
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COP 4610 Operating systems Module 2 Operating System Design PART I 1 Tami Sorgente
Transcript of Operating System Design - Florida Atlantic Universitytami/COP4610M2Slides.pdf · Operating systems...
COP 4610
Operating systemsModule 2
Operating System Design
PART I
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MODULE 2 – OPERATING SYSTEM DESIGN
OS services
OS design goals
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OS DESIGN – OS SERVICES
User Interface
o Command-Line, GUI, batch, touchscreen
Program Execution
I/O Operations
File system manipulation
Communications
a) Message passing
b) Shared memory
Error detection
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OS DESIGN – OS SERVICES CONT
Ensuring efficient operation
o Resource allocation
o Accounting
o Protection and security Protection involves ensuring that all access to system resources
is controlled
Security of the system from outsiders requires user authentication, extends to defending external I/O devices from invalid access attempts
Policy vs Mechanism
o Policy(WHAT)- Mechanism (HOW)
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OPERATING SYSTEM DESIGN
AND IMPLEMENTATION
Start by defining goals and specifications
Affected by choice of hardware, type of system
User goals and System goals
o User goals – operating system should be convenient to use, easy to learn, reliable, safe, and fast
o System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient
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COP 4610
Operating systemsModule 2
Operating System Structure
PART II
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MODULE 2 – OPERATING SYSTEM DESIGN
OS structure
Virtual machine
Types of computer systems
System call examples
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VIEW OF OS SERVICES
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OS DESIGN – OS STRUCTURE
General-purpose OS is very large
Various ways to structure one as follows:
o Monolithic/ simple structure
o Layered approach
o Microkernel
o Modular
o Hybrid
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OS DESIGN – OS STRUCTURE
Layered
o Clearly defined interfaces
o Strict structure
o Each uses service of lower layers
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OS DESIGN – OS STRUCTURE
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Microkernelo Small kernel –
o Move services to user space
o Benefits: Easier to extend a microkernel
Easier to port the operating system to new architectures
More reliable (less code is running in kernel mode)
o Detriments: Performance overhead of user space to kernel space
communication
Application
Program
File
System
Device
Driver
Interprocess
Communication
memory
managment
CPU
scheduling
messagesmessages
microkernel
hardware
user
mode
kernel
mode
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OS DESIGN – OS STRUCTURE
Modular
o Uses object-oriented approach
o Each core component is separate
o Clearly defined interfaces
o Each is loadable as needed within the kernel
o Overall, similar to layers but with more
flexible
Hybrid structure
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OS DESIGN – OS STRUCTURE
Modular vs Layered
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VIRTUAL MACHINE
Advantages – users/ developers
o Isolation, testing
Disadvantages – implementation
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COMPUTER SYSTEMS
Traditional
Interactive vs batch
Real time/ (hard vs soft)
Mobile
Multiprocessor
Clustered
Distributed
Network Operating System
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SYSTEM CALLS
Programming interface to the services provided by the OS
Typically written in a high-level language
Mostly accessed by programs via a high-level Application Program Interface (API) rather than direct system call use
Most details of OS interface hidden from
programmer by API
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EXAMPLES OF
WINDOWS/ UNIX SYSTEM CALLS
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