1. Operating system
... e.g. no matter how many cylinders or what sector size the file system looks the same on all disks ...
... e.g. no matter how many cylinders or what sector size the file system looks the same on all disks ...
PowerPoint 2003
... How do we make different file systems work together, even across machines? How do we provide consistency, availability, and reliability to copies of a file across multiple machines? How do we handle very large data ...
... How do we make different file systems work together, even across machines? How do we provide consistency, availability, and reliability to copies of a file across multiple machines? How do we handle very large data ...
Introduction - University of Pennsylvania
... OS read routine examines the parameters, checks for errors (e.g. file must be open), consults its file table, and determines the disk address from where data is to be retrieved then it sets up registers to initiate transfer by the disk controller ...
... OS read routine examines the parameters, checks for errors (e.g. file must be open), consults its file table, and determines the disk address from where data is to be retrieved then it sets up registers to initiate transfer by the disk controller ...
Slide 1
... Real-Time Operating Systems • Systems with a specific purpose and a certain result • Uses include: ...
... Real-Time Operating Systems • Systems with a specific purpose and a certain result • Uses include: ...
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 ...
ppt
... – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request ...
... – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request ...
Lecture 1: Operating System Services What is an Operating System?
... Interrupt handling: Operating systems are event driven programs. If there are no programs to execute, no I/O devices to service, and no user to respond to, an O.S. will sit quietly, waiting for something to happen. Events are almost always signaled by the occurrence of an interrupt or trap. When an ...
... Interrupt handling: Operating systems are event driven programs. If there are no programs to execute, no I/O devices to service, and no user to respond to, an O.S. will sit quietly, waiting for something to happen. Events are almost always signaled by the occurrence of an interrupt or trap. When an ...
Introduction to Operating Systems - Seneca
... Let more than one program run at once Support multiple users Make hardware transparent so that all disk drives look alike even if made by different companies ...
... Let more than one program run at once Support multiple users Make hardware transparent so that all disk drives look alike even if made by different companies ...
Operating System Concepts
... The Process Concept • Fine! What does that mean? – a Pascal Compiler may be executed by several people simultaneously on a network – There will only be one copy in memory – Different parts of it will be used by several different people to compile their programs – They will share the same code – Eac ...
... The Process Concept • Fine! What does that mean? – a Pascal Compiler may be executed by several people simultaneously on a network – There will only be one copy in memory – Different parts of it will be used by several different people to compile their programs – They will share the same code – Eac ...
OsQuestionPaper
... 1 is a piece of code which only one process executes at a time 2 is a region prone to deadlock 3 is a piece of code which only a finite number of processes execute 4 is found only in Windows NT operation system 7. The mechanism that bring a page into memory only when it is needed is called _________ ...
... 1 is a piece of code which only one process executes at a time 2 is a region prone to deadlock 3 is a piece of code which only a finite number of processes execute 4 is found only in Windows NT operation system 7. The mechanism that bring a page into memory only when it is needed is called _________ ...
Document - Oman College of Management & Technology
... File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing. Error d ...
... File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing. Error d ...
CS 291 – Dynamic Web Prog. With PHP
... ◦ Each processor runs under a single copy of the operating system. ◦ Many processes can run at once without performance deterioration. This does not necessarily mean that there is any improvement… ...
... ◦ Each processor runs under a single copy of the operating system. ◦ Many processes can run at once without performance deterioration. This does not necessarily mean that there is any improvement… ...
Answers to Even-numbered Exercises
... The Free Software Foundation (www.fsf.org) is the principal organizational sponsor of the GNU Project. GNU developed many of the tools, including the C compiler, that are part of the Linux operating system. Linux is the name of the operating system kernel developed by Linus Torvalds, which has since ...
... The Free Software Foundation (www.fsf.org) is the principal organizational sponsor of the GNU Project. GNU developed many of the tools, including the C compiler, that are part of the Linux operating system. Linux is the name of the operating system kernel developed by Linus Torvalds, which has since ...
Module 3: Operating
... programs permanently, the computer system must provide secondary storage to back up main memory. Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. The operating system is responsible for the following activities in connection with disk ma ...
... programs permanently, the computer system must provide secondary storage to back up main memory. Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. The operating system is responsible for the following activities in connection with disk ma ...
Module 3: Operating-System Structures
... permanently, the computer system must provide secondary storage to back up main memory. Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. The operating system is responsible for the following activities in connection with disk management: ...
... permanently, the computer system must provide secondary storage to back up main memory. Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. The operating system is responsible for the following activities in connection with disk management: ...
Operating Systems 2
... Components of an operating system Any access to a file is obtained at the discretion of the file manager. The procedure begins by requesting that the file manager grant access to the file through procedure known as opening the file. If the file manager approves the requested access, it provides ...
... Components of an operating system Any access to a file is obtained at the discretion of the file manager. The procedure begins by requesting that the file manager grant access to the file through procedure known as opening the file. If the file manager approves the requested access, it provides ...
os-1
... Performs the interface task with the hardware (file operations, memory paging, etc.) which should have been done by the user if the OS did not exist High-level interface (GUI, command line a.k.a. CUI) The O/S’s capability for multiuser and multitasking utilize the hardware efficiently Makes visible ...
... Performs the interface task with the hardware (file operations, memory paging, etc.) which should have been done by the user if the OS did not exist High-level interface (GUI, command line a.k.a. CUI) The O/S’s capability for multiuser and multitasking utilize the hardware efficiently Makes visible ...
Chapter 2: System Structures
... System programs provide a convenient environment for program development and execution. They can be divided into: l ...
... System programs provide a convenient environment for program development and execution. They can be divided into: l ...
Operating System Overview: Part 1 1 Objectives and functions
... To reach this new goal, a similar technique to multiprogramming can be used, called time sharing. In such a system, multiple users simultaneously access the system through terminals, with the operating system interleaving the execution of each user program in a short burst of computation. For exampl ...
... To reach this new goal, a similar technique to multiprogramming can be used, called time sharing. In such a system, multiple users simultaneously access the system through terminals, with the operating system interleaving the execution of each user program in a short burst of computation. For exampl ...
Operating System Design
... what is OS design like? • it‘s an engineering project rather than an exact science ...
... what is OS design like? • it‘s an engineering project rather than an exact science ...
process - United International College
... is soon needed, it is still in main memory, saving a disk read. • Modified page can be written out in clusters rather than one at a time, significantly reducing the number of I/O operations and therefore the amount of disk access time ...
... is soon needed, it is still in main memory, saving a disk read. • Modified page can be written out in clusters rather than one at a time, significantly reducing the number of I/O operations and therefore the amount of disk access time ...
Lecture 4: September 11 4.1 Processes 4.2 Memory and Secondary
... processes may be associated with the same program; for example, opening up several windows of the same program typically means more than one process is being executed. In the computing world, processes are formally defined by the operating system(s)(OS) running them and so may differ in detail from ...
... processes may be associated with the same program; for example, opening up several windows of the same program typically means more than one process is being executed. In the computing world, processes are formally defined by the operating system(s)(OS) running them and so may differ in detail from ...