chapter 1 intro excerpt n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Chapter 1: Intro (excerpt) PowerPoint Presentation
Download Presentation
Chapter 1: Intro (excerpt)

Loading in 2 Seconds...

play fullscreen
1 / 8

Chapter 1: Intro (excerpt) - PowerPoint PPT Presentation


  • 43 Views
  • Uploaded on

Chapter 1: Intro (excerpt). What is an Operating System?. What is an Operating System?. A program that acts as an intermediary between a user of a computer and the computer hardware Operating system goals: Execute user programs and make solving user problems easier.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Chapter 1: Intro (excerpt)' - octavius-burgess


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
chapter 1 intro excerpt
Chapter 1: Intro (excerpt)
  • What is an Operating System?
what is an operating system
What is an Operating System?
  • A program that acts as an intermediary between a user of a computer and the computer hardware
  • Operating system goals:
    • Execute user programs and make solving user problems easier.
    • Make the computer system convenient to use
  • Use the computer hardware in an efficient manner
computer system components
Computer System Components

1. Hardware – provides basic computing resources (CPU, memory, I/O devices)

2. Operating system – controls and coordinates the use of the hardware among the various application programs for the various users

3. Applications programs – define the ways in which the system resources are used to solve the computing problems of the users (compilers, database systems, video games, business programs)

4. Users (people, machines, other computers)

operating system definitions
Operating System Definitions
  • Resource allocator – manages and allocates resources
  • Control program – controls the execution of user programs and operations of I/O devices
  • Kernel – the one program running at all times (all else being application programs)
memory layout for a simple batch system
Memory Layout for a Simple Batch System

Includes:

OS Executable Code

I/O Buffers and Tables

Interrupt Vectors

File Tables (FCB, Dir.)

Virtual Memory Tables

Running Process Tables

Includes:

Executable Code

Data

Stack

multiprogrammed batch systems
Multiprogrammed Batch Systems

Several jobs are kept in main memory at the same time, and the

CPU is multiplexed among them

os features needed for multiprogramming
OS Features Needed for Multiprogramming
  • I/O routines are supplied by the system
  • Memory management – the system must allocate the memory to several jobs
  • CPU scheduling – the system must choose among several jobs ready to run
  • Allocation of devices