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Operating SystemThe interface between the user and the computer hardware.
A program that acts as an intermediary between a user of a computer and thecomputer hardwareOperating 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.
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Operating System Structure
KernelCore of operating system, responsible for
loading operating system
User interface
User interact with operating system
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Operating System Functions
Functions ofOS
Intermediator Process
Mgmt
File MgmtMemory
Security
JobScheduling
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Intermediator : Facilitates easy communicationbetween the computer system and the computeroperator (human). It also establishes datasecurity and integrity.Process Mgmt : that is, assignment of processorto different tasks being performed by thecomputer system.
File Mgmt : that is, the storage of file of variousstorage devices to another. It also allows all filesto be easily changed and modified through theuse of text editors or some other filesmanipulation routines.
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Functions(Cont) Memory Mgmt : that is, allocation of mainmemory and other storage areas to the system
programs as well as user programs and data.Security : Operating systems provide passwordprotection to keep unauthorized users out of thesystem.Job Scheduling: it determines and maintainsthe order in which jobs are to be executed in thecomputer system.
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Operating system
GUI Multiuser Multitasking Multiprocessing Multithreading
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Multi userMulti-user - A multi-user operating system allowsfor multiple users to use the same computer at thesame time and/or different times.
Example: LINUX
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Multi Tasking An operating system that is capable of allowingmultiple software processes to run at the same time.
Below are some examples of multitasking operatingsystems.
Unix Windows XP, Vista
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Multi Processing An operating system capable of supporting andutilizing more than one computer processor.more than one CPUs that can be shared
Below are some examples of multiprocessing operatingsystems.LinuxUnix
Windows 2000
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Multi Threading
Smaller parts of a program are loaded when needed by OSOperating systems that allow different parts of a
software program to run concurrently Operating systems that would fall into this category are:
E.GLinux
Unix Windows 2000
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DESKTOPSERVER
MOBILE
Typesof OS
DESKTOP
SERVERMOBILE
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Desktop Operating System
Operating System
Windows Mac Linux
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Advantages of Windows OS
Windows
Easy to use
Update
SupportingGaming
Familiar
Advantages
Windows
expensive
Not secureNot stable
Disadvantages
By MICROSOFT co-operation
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Advantages & Disadvantages of MAC OS
Mac
GreatGUI
Better tographic
designer
Secure
Stable
Advantages
Mac
Notgaming
Not allsoftware
run
Difficultmouse(oneclick)
expensive
Disadvantages
By APPLE Co-operation
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Linux
Free
Stable
SecureSource Code
Low pcrequirement
Advantages Disadvantages
Linux
Not allsoftwarerun
Notsupport
Hard tolearn,
use and
install
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Desktop Operating System
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Server Operating System
Server operating systems are designed to provide platforms formulti-users , for critical, network applications. Their main
purpose is to provide security, stability and collaboration. Mostof them come with a pack of dedicated software tools such asWeb servers, e-mail agents and terminal services The commonapplications for server OSes are:File and printer sharingApplication services (including databases)Web site servicesE-mail, groupware and messagingTerminal servicesCaching
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Server Needs
ServerOperating
System
Administration
Security
StabilityPerformance
Feature
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Mobile Operating System
operating system that controls a mobile device
Mobile OS
SymbianOS iPhone OS RIMBlackBerry WindowsMobile Linux Palm OS
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Conclusion
As Operating System controls and coordinatesthe use of the hardware among the variousapplications programs for various uses, we cansay that it plays a very important role in computer
system.
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