Operating Systems CIS 250
... • I/O requests to read; produces interrupt • O/S saves the address of process on the system stack; disables other interrupts; gets the address of the I/O service from the vector; service routine is run • Get FFF0D from stack; return to program ...
... • I/O requests to read; produces interrupt • O/S saves the address of process on the system stack; disables other interrupts; gets the address of the I/O service from the vector; service routine is run • Get FFF0D from stack; return to program ...
Lecture 22 File-System Interface
... Functions of File Management • Identify and locate a selected file • Use a directory to describe the location of all files plus their attributes • On a shared system describe user access ...
... Functions of File Management • Identify and locate a selected file • Use a directory to describe the location of all files plus their attributes • On a shared system describe user access ...
Protection in General-Purpose Operating Systems
... Segmentation divides a program into separate pieces. Each piece has a logical unity, a relationship among all of its code or data value. Segmentation was developed as a feasible means to have the effect of an unbounded number of base/bounds registers: a program could be divided into many pieces havi ...
... Segmentation divides a program into separate pieces. Each piece has a logical unity, a relationship among all of its code or data value. Segmentation was developed as a feasible means to have the effect of an unbounded number of base/bounds registers: a program could be divided into many pieces havi ...
Lecture slides
... The idea behind operating different services at different run levels essentially revolves around the fact that different systems can be used in different ways. Some services cannot be used until the system is in a particular state, or mode, such as being ready for more than one user or having networ ...
... The idea behind operating different services at different run levels essentially revolves around the fact that different systems can be used in different ways. Some services cannot be used until the system is in a particular state, or mode, such as being ready for more than one user or having networ ...
PPT - CSE Home
... Collection of tools and topics not specifically addressed in other courses that CSE majors should know CSE 351 may be the first course you take that uses Linux Course Topics: Linix command line interface (CLI), Shell scripting, compilation tools (makefiles), version control… Credit / No Cred ...
... Collection of tools and topics not specifically addressed in other courses that CSE majors should know CSE 351 may be the first course you take that uses Linux Course Topics: Linix command line interface (CLI), Shell scripting, compilation tools (makefiles), version control… Credit / No Cred ...
ppt
... Hardware is Cheap Humans Expensive • Turn around time 1/2 day • Programmer time wasted! “Sigh. In the good old days….” – Time-sharing – Multics (sorta) – New problems ...
... Hardware is Cheap Humans Expensive • Turn around time 1/2 day • Programmer time wasted! “Sigh. In the good old days….” – Time-sharing – Multics (sorta) – New problems ...
Introduction - USC Upstate: Faculty
... output devices, and network interfaces. – An operating system manages multiple users. – An operating system manages multiple programs (multitasking). ...
... output devices, and network interfaces. – An operating system manages multiple users. – An operating system manages multiple programs (multitasking). ...
Lecture Overview Operating System Components
... extended machine with a convenient interface; it is possible to separate these two functions • A virtual machine provides multiprogramming only by providing an exact virtual copies of the bare hardware • The operating system creates the illusion of multiple processes, each executing on its own proce ...
... extended machine with a convenient interface; it is possible to separate these two functions • A virtual machine provides multiprogramming only by providing an exact virtual copies of the bare hardware • The operating system creates the illusion of multiple processes, each executing on its own proce ...
Mohammad Husain
... The OS is a program that acts as an intermediary between the user (application programs) and the hardware resources OS interacts with hardware and manages programs. Programs not expected to know which hardware they will run on. Thus they can’t manage their self OS provides a safe environment for pro ...
... The OS is a program that acts as an intermediary between the user (application programs) and the hardware resources OS interacts with hardware and manages programs. Programs not expected to know which hardware they will run on. Thus they can’t manage their self OS provides a safe environment for pro ...
OS Services System calls and their types
... storage) may have special allocation code, others (such as I/O devices) may have general request and release code – Accounting - To keep track of which users use how much and what kinds of computer resources – Protection and security - The owners of information stored in a multiuser or networked com ...
... storage) may have special allocation code, others (such as I/O devices) may have general request and release code – Accounting - To keep track of which users use how much and what kinds of computer resources – Protection and security - The owners of information stored in a multiuser or networked com ...
System
... memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. Accounting – To keep track of which users use how much and what kinds of computer resources ( billing) Protection and security – Concurrent processes should not in ...
... memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. Accounting – To keep track of which users use how much and what kinds of computer resources ( billing) Protection and security – Concurrent processes should not in ...
View File
... – I/O operations - A running program may require I/O, which may involve a file or an I/O device. – File-system manipulation - The file system is of particular interest. Obviously, programs need to read and write files and directories, create and delete them, search them, list file Information, ...
... – I/O operations - A running program may require I/O, which may involve a file or an I/O device. – File-system manipulation - The file system is of particular interest. Obviously, programs need to read and write files and directories, create and delete them, search them, list file Information, ...
Operating Systems Review
... 9) What is the difference between cooperative multitasking and preemptive multitasking? cooperative – programs check the cpu to see if anyone else needs it, and if they do, they let the cpu go help the other program preemptive – os keeps a list of what’s running and assigns priorities to the differe ...
... 9) What is the difference between cooperative multitasking and preemptive multitasking? cooperative – programs check the cpu to see if anyone else needs it, and if they do, they let the cpu go help the other program preemptive – os keeps a list of what’s running and assigns priorities to the differe ...
Self-Managing Techniques for Shared Server Resources
... How does the OS execute on the hardware? What’s the relation between OS and user programs? ...
... How does the OS execute on the hardware? What’s the relation between OS and user programs? ...
lecture2
... Exact type and amount of information vary according to OS and call Three general methods used to pass parameters to the OS Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block p ...
... Exact type and amount of information vary according to OS and call Three general methods used to pass parameters to the OS Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block p ...
PDF
... traps and context switches that occur, and make a note of the privilege mode at each point of execution. (e) Would it make sense for a webcam to use DMA or interrupt-based I/O? Why? Give an example device that could sensibly use the other form of I/O. 2. Processes Suppose we wished to write an opera ...
... traps and context switches that occur, and make a note of the privilege mode at each point of execution. (e) Would it make sense for a webcam to use DMA or interrupt-based I/O? Why? Give an example device that could sensibly use the other form of I/O. 2. Processes Suppose we wished to write an opera ...
The Linux System
... repeated execution of the included commands without their having to be laboriously retyped each time they are executed. If there is a distinct ordered list of operating system commands that the user needs to execute repeatedly, for example, immediately after every login or immediately before every ...
... repeated execution of the included commands without their having to be laboriously retyped each time they are executed. If there is a distinct ordered list of operating system commands that the user needs to execute repeatedly, for example, immediately after every login or immediately before every ...
資工系網媒所NEWS實驗室Chapter 2
... Failure of an application can generate core dump file capturing memory of the process Operating system failure can generate crash dump file containing kernel memory Beyond crashes, performance tuning can optimize system performance Kernighan’s Law: “Debugging is twice as hard as writing the code in ...
... Failure of an application can generate core dump file capturing memory of the process Operating system failure can generate crash dump file containing kernel memory Beyond crashes, performance tuning can optimize system performance Kernighan’s Law: “Debugging is twice as hard as writing the code in ...
Document
... Storage management Drivers are also used to manage memory storage peripherals e.g. disks, tape etc. • One function of the OS is to configure and manage part of the storage device for virtual memory. • A further function of the OS is to determine which parts of “current processes” are consigned to t ...
... Storage management Drivers are also used to manage memory storage peripherals e.g. disks, tape etc. • One function of the OS is to configure and manage part of the storage device for virtual memory. • A further function of the OS is to determine which parts of “current processes” are consigned to t ...
Operating- System Structures
... List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs to provide these services. Answer: a. Program execution. The operating system loads the contents (or sections) of a file ...
... List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs to provide these services. Answer: a. Program execution. The operating system loads the contents (or sections) of a file ...
introduction to operating system
... in memory and on disk (the CPU is allocated to a job only if the job is in memory). The CPU is switched among multiple jobs so frequently that the users may interact with each program during execution. On-line communication between the user and the system is provided; when the operating system fin ...
... in memory and on disk (the CPU is allocated to a job only if the job is in memory). The CPU is switched among multiple jobs so frequently that the users may interact with each program during execution. On-line communication between the user and the system is provided; when the operating system fin ...
Summary: OS Concepts System Calls
... System Calls (1) • A stripped down shell: while (TRUE) { /* repeat forever */ type_prompt( ); /* display prompt */ read_command (command, parameters) /* input from terminal */ if (fork() != 0) { /* fork off child process */ /* Parent code */ waitpid( -1, &status, 0);/* wait for child to exit */ } el ...
... System Calls (1) • A stripped down shell: while (TRUE) { /* repeat forever */ type_prompt( ); /* display prompt */ read_command (command, parameters) /* input from terminal */ if (fork() != 0) { /* fork off child process */ /* Parent code */ waitpid( -1, &status, 0);/* wait for child to exit */ } el ...
Introduction
... interrupted instruction. • Incoming interrupts are disabled while another interrupt is being processed to prevent a lost interrupt. • A trap (or exception) is a software-generated interrupt caused either by an error or a user request. • An operating system is interrupt driven. ...
... interrupted instruction. • Incoming interrupts are disabled while another interrupt is being processed to prevent a lost interrupt. • A trap (or exception) is a software-generated interrupt caused either by an error or a user request. • An operating system is interrupt driven. ...