L03_Processes
... The kernel contains code for the most basic OS services All other OS services are provided by separate processes running in user space Can modify components while system is running, don’t need to recompile to change a driver or other component kernel, drivers export function tables to each oth ...
... The kernel contains code for the most basic OS services All other OS services are provided by separate processes running in user space Can modify components while system is running, don’t need to recompile to change a driver or other component kernel, drivers export function tables to each oth ...
The Evolution of OS
... – 1st Batch system by General Motor (GM) at the mid 50’s on an IBM 701 – to reduce the time wasted by scheduling and setup time – the use of monitor Interrupt Processing – monitor loads programs one after another in a batch – two parts (Figure 2.3) Device • resident monitor Drivers Monitor • user pr ...
... – 1st Batch system by General Motor (GM) at the mid 50’s on an IBM 701 – to reduce the time wasted by scheduling and setup time – the use of monitor Interrupt Processing – monitor loads programs one after another in a batch – two parts (Figure 2.3) Device • resident monitor Drivers Monitor • user pr ...
Operating systems
... New operating systems were developed that allowed a program being executed to carry on a dialogue with the user through remote terminals (interactive processing) – in which the user could type input and read the computer’s response. ...
... New operating systems were developed that allowed a program being executed to carry on a dialogue with the user through remote terminals (interactive processing) – in which the user could type input and read the computer’s response. ...
Operating System Overview: Part 1 1 Objectives and functions
... It is not the OS itself but the hardware that makes all kinds of services possible and available to application programs. An OS merely exploits the hardware to provide easily accessible interfaces. Exploitation means management upon the hardware resources, and thus also imposes control upon or manag ...
... It is not the OS itself but the hardware that makes all kinds of services possible and available to application programs. An OS merely exploits the hardware to provide easily accessible interfaces. Exploitation means management upon the hardware resources, and thus also imposes control upon or manag ...
Introduction to Computer Science
... related programs: a client program and a server program. The server program must be running all the time; the client program can be running only when needed. This model is implemented at the application layer. 4. What is the main function of the transport layer in the TCP/IP protocol suite? What typ ...
... related programs: a client program and a server program. The server program must be running all the time; the client program can be running only when needed. This model is implemented at the application layer. 4. What is the main function of the transport layer in the TCP/IP protocol suite? What typ ...
PPT
... Thus time sharing systems needed shared file systems that held commonly used programs Users could log in, run utilities, store input and output file in shared file system ...
... Thus time sharing systems needed shared file systems that held commonly used programs Users could log in, run utilities, store input and output file in shared file system ...
History of Operating Systems
... The effort in design and development of an operating system is comparable to that of the computer hardware. The modern operating system is a composite of systems designed since the late 1940s and to date one can delineate four generations (each with significant milestones) of operating systems. ...
... The effort in design and development of an operating system is comparable to that of the computer hardware. The modern operating system is a composite of systems designed since the late 1940s and to date one can delineate four generations (each with significant milestones) of operating systems. ...
slides
... • The OS abstracts hardware into logical resources and welldefined interfaces to those resources (ease of use) ...
... • The OS abstracts hardware into logical resources and welldefined interfaces to those resources (ease of use) ...
OS imp structures
... • Important: Machine-dependent vs independent layers – Easier migration between platforms – Easier evolution of hardware platform ...
... • Important: Machine-dependent vs independent layers – Easier migration between platforms – Easier evolution of hardware platform ...
Operating Systems - Cardiff University
... – Complex design – each functionality has to be divided into parts to fit into different layers. ...
... – Complex design – each functionality has to be divided into parts to fit into different layers. ...
CS 519 Operating Systems Theory Spring 1998
... client-server model, IPC between clients and servers the micro-kernel provides protected communication OS functions implemented as user-level servers flexible but efficiency is the problem easy to extend for distributed systems ...
... client-server model, IPC between clients and servers the micro-kernel provides protected communication OS functions implemented as user-level servers flexible but efficiency is the problem easy to extend for distributed systems ...
Slides - Dr. Choong
... 91.65% by Net Applications Aiming at robust, server market Intel x86 only Lines of code (according to wikipedia) Windows NT 4.0 : 11-12 million Windows 2000 : more than 29 million Windows XP : 40 million Windows Vista Beta 2 : 50 million ...
... 91.65% by Net Applications Aiming at robust, server market Intel x86 only Lines of code (according to wikipedia) Windows NT 4.0 : 11-12 million Windows 2000 : more than 29 million Windows XP : 40 million Windows Vista Beta 2 : 50 million ...
OPERATING SYSTEM CONCEPTS
... Switching the CPU to another process requires saving the state of the old process and loading the saved state for the new process. This task is known as a context switch. Context-switch time is pure overhead, because the system does no useful work while switching. Its speed varies from machine to m ...
... Switching the CPU to another process requires saving the state of the old process and loading the saved state for the new process. This task is known as a context switch. Context-switch time is pure overhead, because the system does no useful work while switching. Its speed varies from machine to m ...
Operating Systems - KSU Web Home
... The system the system call interface separates the kernel from the application layer and the kernel is located above the hardware The kernel is the core, and most critical part, of the operating system and needs to be always ...
... The system the system call interface separates the kernel from the application layer and the kernel is located above the hardware The kernel is the core, and most critical part, of the operating system and needs to be always ...
Lecture_1 - bridges to computing
... If a computer only one set of tasks to perform and uses very simple input (a few buttons) it usually doesn't need an operating system. Simple computers run one program at a time, and that program talks directly to the hardware. ...
... If a computer only one set of tasks to perform and uses very simple input (a few buttons) it usually doesn't need an operating system. Simple computers run one program at a time, and that program talks directly to the hardware. ...
pdf
... Consider the various definitions of operating system. Next, consider whether the operating system should include applications such as Web browsers and mail programs. Argue both that it should and that it should not, and support your answers. Answer: Point. Applications such as web browsers and email ...
... Consider the various definitions of operating system. Next, consider whether the operating system should include applications such as Web browsers and mail programs. Argue both that it should and that it should not, and support your answers. Answer: Point. Applications such as web browsers and email ...
Operating Systems
... added burden of ensuring that they are not compromised by malicious (or incompetent) parties: Breach of confidentiality is an attack that discovers information (such as passwords) that the attacker isn’t normally allowed to see Escalation of privileges is an attack that inappropriately grants superu ...
... added burden of ensuring that they are not compromised by malicious (or incompetent) parties: Breach of confidentiality is an attack that discovers information (such as passwords) that the attacker isn’t normally allowed to see Escalation of privileges is an attack that inappropriately grants superu ...
Name: Logan Foraker3-1 INTERNET REASEARCH ASSIGNMENT
... 8. When you turn on your computer, it's nice to think that you're in __________. 9. Most desktop or laptop PCs come _______________with Microsoft Windows. 10. Many corporate servers use the ___________ or _________ operating systems. 11. The purpose of an _____________ ____________ is to organize an ...
... 8. When you turn on your computer, it's nice to think that you're in __________. 9. Most desktop or laptop PCs come _______________with Microsoft Windows. 10. Many corporate servers use the ___________ or _________ operating systems. 11. The purpose of an _____________ ____________ is to organize an ...
Centralized computing
... If processes don’t fit in memory, swapping moves them in and out to run Virtual memory allows execution of processes not completely in memory ...
... If processes don’t fit in memory, swapping moves them in and out to run Virtual memory allows execution of processes not completely in memory ...
View File
... • Affected by choice of hardware, type of system • User goals and System goals – User goals – operating system should be convenient to use, easy to learn, reliable, safe, and fast – System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, erro ...
... • Affected by choice of hardware, type of system • User goals and System goals – User goals – operating system should be convenient to use, easy to learn, reliable, safe, and fast – System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, erro ...
Operating System
... – Each process is allocated a “slice” of time in the CPU. – When the time runs out, the process is interrupted, and another process is loaded into the CPU. • The act of giving each process a small slice of time to run is called time slicing. ...
... – Each process is allocated a “slice” of time in the CPU. – When the time runs out, the process is interrupted, and another process is loaded into the CPU. • The act of giving each process a small slice of time to run is called time slicing. ...
Module 3: Operating
... The protected subsystems provide the traditional operating system support to applications through a feature-rich set of APIs. Note: With Windows NT version 4.0, the GUI system was put “back” into the kernel for display performance considerations. (This also caused some robustness problems) ...
... The protected subsystems provide the traditional operating system support to applications through a feature-rich set of APIs. Note: With Windows NT version 4.0, the GUI system was put “back” into the kernel for display performance considerations. (This also caused some robustness problems) ...
What is an Operating System
... response time) and in a fair manner. It is a Control Program. – Manages all the components of a complex computer system in an integrated manner. – Controls the execution of user programs and I/O devices to prevent errors and improper use of the computer resources. – Looks over and protects the com ...
... response time) and in a fair manner. It is a Control Program. – Manages all the components of a complex computer system in an integrated manner. – Controls the execution of user programs and I/O devices to prevent errors and improper use of the computer resources. – Looks over and protects the com ...
operating systems
... Refers to a computer system's ability to support more than one process (program) at the same time. Multiprocessing operating systems enable several programs to run concurrently. UNIX is one of the most widely used multiprocessing systems. Refers to the utilization of multiple CPUs in a single comput ...
... Refers to a computer system's ability to support more than one process (program) at the same time. Multiprocessing operating systems enable several programs to run concurrently. UNIX is one of the most widely used multiprocessing systems. Refers to the utilization of multiple CPUs in a single comput ...