beginner to advance level Presentation on Operating System (OS)

Operating System
A program that controls the execution of
application programs
 An interface between applications and hardware
Main objectives of an OS:

• convenience
• efficiency
• ability to evolve

, Application programs
Application
programming interface
Application Libraries/utilities Software
binary interface
Operating system
Instruction Set
Architecture
Execution hardware


Memory
System interconnect
translation Hardware
(bus)

I/O devices
Main
and
memory
networking




Figure 2.1 Computer Hardware and Software Structure

, Operating System Services

 Program development
 Program execution
 Access I/O devices
 Controlled access to files
 System access
 Error detection and response
 Accounting

, Key Interfaces

 Instruction set architecture (ISA)
 Application binary interface (ABI)
 Application programming interface (API)