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Operating System Presentation Transcript
1.Operating SYStem
2.OS – The Operating System
Agent between Software and H/W
User intervention is not required
Two types of Computer S/W;
System Software
Application S/W
OS make sure resources are available for all the processes.
OS supports a particular type of processor
What is your OS ?
Agent between Software and H/W
User intervention is not required
Two types of Computer S/W;
System Software
Application S/W
OS make sure resources are available for all the processes.
OS supports a particular type of processor
What is your OS ?
3.OS and CPU
Single tasking OS
Run only one application at a time.
MS-DOS
Multi Tasking OS
User can work on multiple program simultaneously at single time.
CPU don’t run programs together; it switches as needed
Active Program: Foreground Prog. Inactive Prog: Background Prog
Multi-tasking is different than time-sharing
Cooperative Multi-tasking
Different program controls CPU at different time
Foreground program gains CPU hold
If the Foreground Prog is crashed then OS will hang
Mac OS and Windows earlier version used this way
Preemptive Multi Tasking
Enable OS to regain hold of CPU even if one program is crashed
Each process is given a slice of time
When time expires the OS preempts the process and slice is given to another process
Linux, Windows 95, Windows 98, Windows NT
Multi Threading
Extended concept of Multi-Tasking
Allows individual programs to carry out multiple task simultaneously
Each task is called thread
Computer can execute more than one task in a single program
Ex web page takes long time to load, you click to close it, then a seerate thread cclose the wiindow
Symmetric Multi Processing
User of two or more processor ata a time
Linux, windows NT and Mac OS 8
Single tasking OS
Run only one application at a time.
MS-DOS
Multi Tasking OS
User can work on multiple program simultaneously at single time.
CPU don’t run programs together; it switches as needed
Active Program: Foreground Prog. Inactive Prog: Background Prog
Multi-tasking is different than time-sharing
Cooperative Multi-tasking
Different program controls CPU at different time
Foreground program gains CPU hold
If the Foreground Prog is crashed then OS will hang
Mac OS and Windows earlier version used this way
Preemptive Multi Tasking
Enable OS to regain hold of CPU even if one program is crashed
Each process is given a slice of time
When time expires the OS preempts the process and slice is given to another process
Linux, Windows 95, Windows 98, Windows NT
Multi Threading
Extended concept of Multi-Tasking
Allows individual programs to carry out multiple task simultaneously
Each task is called thread
Computer can execute more than one task in a single program
Ex web page takes long time to load, you click to close it, then a seerate thread cclose the wiindow
Symmetric Multi Processing
User of two or more processor ata a time
Linux, windows NT and Mac OS 8
4.User Interface
Command Line User Interface
Character based user interface
Prompt is shown to user to make a command
It have predefined set of rules called syntax
Mostly used in system administrative task
Menu driven User Interface
Interface provides range of options to choose command and then enter to prompt
Graphical User Interface
Desktop, Pointer, Pointing Device, icons and windows
Command Line User Interface
Character based user interface
Prompt is shown to user to make a command
It have predefined set of rules called syntax
Mostly used in system administrative task
Menu driven User Interface
Interface provides range of options to choose command and then enter to prompt
Graphical User Interface
Desktop, Pointer, Pointing Device, icons and windows
5.Types of OS
UNIX
Developed in early 70’s at Bell Labs
UNIX was written in C language
Main motive was to enable programmers to access system and share resources simultaneously.
It lacks in incompatibility with different versions, cryptic commands and lack of user-friendliness
MS DOS
Disk Operating System
MS developed DOS for IBM compatible computers
Character based and single tasking OS
UNIX
Developed in early 70’s at Bell Labs
UNIX was written in C language
Main motive was to enable programmers to access system and share resources simultaneously.
It lacks in incompatibility with different versions, cryptic commands and lack of user-friendliness
MS DOS
Disk Operating System
MS developed DOS for IBM compatible computers
Character based and single tasking OS
6.Mac OS
Macinstosh OS was developed by Apple Inc.
This OS featured GUI for the first time
Released in 1984
First time easiest OS for first time PC users
Windows 3.X
Released in 1990
Enabled users to take advantage of Intel’s 32-bit processor
Intel newly offered protected mode – acess virtually unlimitaed amount of memory
Windows 3.1, 3.11 – collectively called Windows 3.X
Macinstosh OS was developed by Apple Inc.
This OS featured GUI for the first time
Released in 1984
First time easiest OS for first time PC users
Windows 3.X
Released in 1990
Enabled users to take advantage of Intel’s 32-bit processor
Intel newly offered protected mode – acess virtually unlimitaed amount of memory
Windows 3.1, 3.11 – collectively called Windows 3.X
7.Windows 3.0
SDK – the new feature
Windows 3.1
Mouse was introduced as input device
Windows 3.11
Peer-to-peer workgroups
Workgroups were introduced
SDK – the new feature
Windows 3.1
Mouse was introduced as input device
Windows 3.11
Peer-to-peer workgroups
Workgroups were introduced
8.Windows 95 & 98
Windows Me
September 2001
Windows Me
September 2001
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