Introduction to OS
... 2. Operating System Objectives and functions Q. what are the operating system objectives? Ans: Operating systems has got three main objectives:1. Convenience:- The OS must make the computer convenient to use. 2. Efficiency:- The OS must make efficient use of computing resources. 3. Ability to evolv ...
... 2. Operating System Objectives and functions Q. what are the operating system objectives? Ans: Operating systems has got three main objectives:1. Convenience:- The OS must make the computer convenient to use. 2. Efficiency:- The OS must make efficient use of computing resources. 3. Ability to evolv ...
Lecture 11 Operating Systems • Free - VU LMS
... particular operation executes in precisely the same amount of time every time it occurs ...
... particular operation executes in precisely the same amount of time every time it occurs ...
Lecture 22 File-System Interface
... collection of similar records treated as a single entity have unique file names may restrict access ...
... collection of similar records treated as a single entity have unique file names may restrict access ...
Why Study OS?
... Examples that are not provided at user level System calls: file open, close, read and write l Control the CPU so that users won’t stuck by running l ...
... Examples that are not provided at user level System calls: file open, close, read and write l Control the CPU so that users won’t stuck by running l ...
Computers
... New/Ready/Wait/etc Address of next instruction Start and end location of process in memory Register contents I/O requests and assignments ...
... New/Ready/Wait/etc Address of next instruction Start and end location of process in memory Register contents I/O requests and assignments ...
Southeastern University
... Interrupts are provided as a way to improve processing efficiency. Handlers are responsible for managing the Interrupts. A program that determines nature of the interrupt and performs whatever actions are needed Control is transferred to this program Generally part of the operating system ...
... Interrupts are provided as a way to improve processing efficiency. Handlers are responsible for managing the Interrupts. A program that determines nature of the interrupt and performs whatever actions are needed Control is transferred to this program Generally part of the operating system ...
Introduction and Overview - William & Mary Computer Science
... • use a hardware timer that generates a periodic interrupt • before it transfers to a user program, the OS loads the timer with a time to interrupt – “quantum” – how big should it be set? ...
... • use a hardware timer that generates a periodic interrupt • before it transfers to a user program, the OS loads the timer with a time to interrupt – “quantum” – how big should it be set? ...
Computer Science 8530 Advanced Operating Systems Fall 2016
... 17. Where is it likely that the majority of user-accessible register contents will be saved when a process is moved from the running/current state to the ready state? Where else might some other register contents be saved? Use Xinu on the Galileo as a specific case. 18. The three characteristic p ...
... 17. Where is it likely that the majority of user-accessible register contents will be saved when a process is moved from the running/current state to the ready state? Where else might some other register contents be saved? Use Xinu on the Galileo as a specific case. 18. The three characteristic p ...
ppt
... Multiprocessing and Distributed Systems • Types of multi-computers • Shared memory multiprocessors • Clusters of separate computers • Distributed systems ...
... Multiprocessing and Distributed Systems • Types of multi-computers • Shared memory multiprocessors • Clusters of separate computers • Distributed systems ...
OPERATING SYSTEMS
... OS coordinates system resources to maximize the amount of processing per unit time 4. To minimize the time needed to execute a user command. 5. To optimize the use of computer system resources. OS constantly keeps track of what tasks need to be done and what resources (processor, RAM, peripheral dev ...
... OS coordinates system resources to maximize the amount of processing per unit time 4. To minimize the time needed to execute a user command. 5. To optimize the use of computer system resources. OS constantly keeps track of what tasks need to be done and what resources (processor, RAM, peripheral dev ...
Operating-System Structure
... approach in that the primary module has only core functions and knowledge of how to load and communicate with other modules; but it is more efficient, because modules do not need to invoke message passing in order to communicate. ...
... approach in that the primary module has only core functions and knowledge of how to load and communicate with other modules; but it is more efficient, because modules do not need to invoke message passing in order to communicate. ...
CS 111
... risk involved in programs and memory protection, the kernel is in fact the only program that is allowed to run in supervisor mode. This policy maintains safe access to files and programs. The kernel is the only program that starts and maintains user processes. This seems like a fairly simple idea bu ...
... risk involved in programs and memory protection, the kernel is in fact the only program that is allowed to run in supervisor mode. This policy maintains safe access to files and programs. The kernel is the only program that starts and maintains user processes. This seems like a fairly simple idea bu ...
ICS 143 - Introduction to Operating Systems
... ◦ Understand interaction between the hardware and software ◦ Understand basic principles in the design of computer systems Resource management, security, portability, flexibility ◦ Increasing need for specialized OS Operating systems for embedded devices such as cell phones, sensors, and actuat ...
... ◦ Understand interaction between the hardware and software ◦ Understand basic principles in the design of computer systems Resource management, security, portability, flexibility ◦ Increasing need for specialized OS Operating systems for embedded devices such as cell phones, sensors, and actuat ...
Types of services
... functions may be desired (such as to rewind a tape drive, or to blank a CRT screen). For efficiency and protection, users usually cannot control I/0 devices directly. ...
... functions may be desired (such as to rewind a tape drive, or to blank a CRT screen). For efficiency and protection, users usually cannot control I/0 devices directly. ...
History of Unix OS
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do on ...
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do on ...
Computer Science 4302 - Angelo State University
... and functions. Performance issues associated with I/O devices will also be covered. 5. Protection and Security The student will learn the mechanisms necessary for the protection and security of computer systems. The processes in an operating system must be protected from one another’s activities, an ...
... and functions. Performance issues associated with I/O devices will also be covered. 5. Protection and Security The student will learn the mechanisms necessary for the protection and security of computer systems. The processes in an operating system must be protected from one another’s activities, an ...
VMS-Spr-2001-sect-1-group
... • Provides security from denial-of-service attacks, hot-swappable hardware, and the ability to run multiple instances of the operating system on the same machine to increase reliability ...
... • Provides security from denial-of-service attacks, hot-swappable hardware, and the ability to run multiple instances of the operating system on the same machine to increase reliability ...
01- introduction
... on the first pass. The right approach is to [read each chapter before class and] re-read each chapter once we've covered the corresponding material… more of it will make sense then. Don't ...
... on the first pass. The right approach is to [read each chapter before class and] re-read each chapter once we've covered the corresponding material… more of it will make sense then. Don't ...
PPT
... systems. They mention “an unstable situation” which we now refer as unsafe and deadlocked • Layered approach: they argue the some commercial entities might not appreciate the simplicity because their university system was just too simple • Page relocation –hard to imagine because machines had so lit ...
... systems. They mention “an unstable situation” which we now refer as unsafe and deadlocked • Layered approach: they argue the some commercial entities might not appreciate the simplicity because their university system was just too simple • Page relocation –hard to imagine because machines had so lit ...
CSE 5431 (Approved): Systems II: Introduction to Operating Systems
... Be familiar with process control blocks, system calls, context switching, interrupts, and exception control flows. Be familiar with process synchronization, inter-process communication, and threads. Be familiar with multi-threaded programming. Be familiar with file systems and disk scheduling algori ...
... Be familiar with process control blocks, system calls, context switching, interrupts, and exception control flows. Be familiar with process synchronization, inter-process communication, and threads. Be familiar with multi-threaded programming. Be familiar with file systems and disk scheduling algori ...
Operating System Concepts, Terminology, and History
... often only part of the information needed to select an operating system. – The variety of PC hardware (models of video, I/O, and network cards) all require specific software drivers. – The availability of drivers for a specific device and a specific operating system is critical. – All components in ...
... often only part of the information needed to select an operating system. – The variety of PC hardware (models of video, I/O, and network cards) all require specific software drivers. – The availability of drivers for a specific device and a specific operating system is critical. – All components in ...
CS 414/415 Systems Programming and Operating Systems
... – Huge, parallel, very expensive, not understood • Windows NT/XP: 10 years, 1000s of people, … ...
... – Huge, parallel, very expensive, not understood • Windows NT/XP: 10 years, 1000s of people, … ...
Chapter 2 Operating System Overview Operating System Overview
... • Various approaches have been tried, categories include: ...
... • Various approaches have been tried, categories include: ...
