Lecture 6
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The document discusses four main types of operating systems: 1) Real-time operating systems which control machinery and ensure precise timing for operations. 2) Single-user, single-task operating systems which allow one user to do one thing at a time, like Palm OS. 3) Single-user, multi-tasking operating systems like Windows and MacOS which let a single user run multiple programs simultaneously. 4) Multi-user operating systems which allow many users to access computer resources at the same time, requiring balance between users, like Unix, VMS, and MVS.
Lecture 6
- 1. Operating System General DIT Part 1 Lecture 6
- 2. Operating Systems Work • Within the broad family of operating systems, there are generally four types, categorized based on the types of computers they control and the sort of applications they support. The categories are: • Real-time operating system. • Single-user, single task. • Single-user, multi-tasking. • Multi-user. Copyrights By Tanveer Malik
- 3. Real-Time Operating System • Real-time operating systems are used to control machinery, scientific instruments and industrial systems. • An RTOS typically has very little user-interface capability, and no end-user utilities, since the system will be a "sealed box" when delivered for use. • A very important part of an RTOS is managing the resources of the computer so that a particular operation executes in precisely the same amount of time, every time it occurs. Copyrights By Tanveer Malik
- 4. Real-Time Operating System • In a complex machine, having a part move more quickly just because system resources are available may be just as catastrophic as having it not move at all because the system is busy. Copyrights By Tanveer Malik
- 5. Single-User, Single Task • As the name implies, this operating system is designed to manage the computer so that one user can effectively do one thing at a time. • The Palm OS for Palm handheld computers is a good example of a modern single-user, single- task operating system. Copyrights By Tanveer Malik
- 6. Single-User, Multi-Tasking • This is the type of operating system most people use on their desktop and laptop computers today. • Microsoft's Windows and Apple's MacOS platforms are both examples of operating systems that will let a single user have several programs in operation at the same time. • For example, it's entirely possible for a Windows user to be writing a note in a word processor while downloading a file from the Internet while printing the text of an e-mail message. Copyrights By Tanveer Malik
- 7. Multi-User • A multi-user operating system allows many different users to take advantage of the computer's resources simultaneously. • The operating system must make sure that the requirements of the various users are balanced, and that each of the programs they are using has sufficient and separate resources so that a problem with one user doesn't affect the entire community of users. Copyrights By Tanveer Malik
- 8. Multi-User • Unix, VMS and mainframe operating systems, such as MVS, are examples of multi-user operating systems. Copyrights By Tanveer Malik