ppt - McMaster CAS Dept.
... THE WAITING STATE (II) A system call that does not require callers to wait until its completion is said to be non-blocking • Calling processes are immediately returned to the READY state The waiting state is organized as a set of queues • One queue per device, OS resource ...
... THE WAITING STATE (II) A system call that does not require callers to wait until its completion is said to be non-blocking • Calling processes are immediately returned to the READY state The waiting state is organized as a set of queues • One queue per device, OS resource ...
Lecture 2
... – Goal of multiprogramming is to efficiently utilize all of the computing resources. – When a job issues an I/O request (e.g., open a file, read data from a file), it cannot continue until the request is fulfilled. – The CPU then becomes idle (the job is blocked on the request). ...
... – Goal of multiprogramming is to efficiently utilize all of the computing resources. – When a job issues an I/O request (e.g., open a file, read data from a file), it cannot continue until the request is fulfilled. – The CPU then becomes idle (the job is blocked on the request). ...
CS 377: Operating Systems Outline
... • Accounting information - records of the amount of resources being used by a process • File table - list of all files currently opened by the process • Signal-handler table - lists how the process should respond to signals • Virtual memory context - describes the layout of the process’s address ...
... • Accounting information - records of the amount of resources being used by a process • File table - list of all files currently opened by the process • Signal-handler table - lists how the process should respond to signals • Virtual memory context - describes the layout of the process’s address ...
Judul - Binus Repository
... – When you get a brand-new printer or monitor, you may also need to install the device driver for it – Device drivers come with new hardware, or download from the manufacturer’s website, or sites like www.driverguide.com or www.windrivers.com • Utilities – Service programs that perform tasks related ...
... – When you get a brand-new printer or monitor, you may also need to install the device driver for it – Device drivers come with new hardware, or download from the manufacturer’s website, or sites like www.driverguide.com or www.windrivers.com • Utilities – Service programs that perform tasks related ...
Software types - Deyes High School
... • An operating system has many tasks. Here are just a few of them: • Manages System Security - user names and passwords, preventing unauthorised access, monitoring and restricting access to programs and data. • Organising files and folders to backing storage, sorting out where to store data on disk ...
... • An operating system has many tasks. Here are just a few of them: • Manages System Security - user names and passwords, preventing unauthorised access, monitoring and restricting access to programs and data. • Organising files and folders to backing storage, sorting out where to store data on disk ...
1.1 What is an Operating System?
... transfer of data from the device to its local buffer. Once the transfer of data is complete, the device controller informs the CPU that it has finished its operation. It accomplishes this communication by causing an interrupt. When the CPU is interrupted, it stops what it is doing and transfers exec ...
... transfer of data from the device to its local buffer. Once the transfer of data is complete, the device controller informs the CPU that it has finished its operation. It accomplishes this communication by causing an interrupt. When the CPU is interrupted, it stops what it is doing and transfers exec ...
A1_OS Review
... several processes/threads at a time on a single CPU. The OS keeps several jobs in memory simultaneously. It selects a job from the ready state and starts executing it. When that job needs to wait for some event the CPU is switched to another job. Primary objective: eliminate CPU idle time Time shari ...
... several processes/threads at a time on a single CPU. The OS keeps several jobs in memory simultaneously. It selects a job from the ready state and starts executing it. When that job needs to wait for some event the CPU is switched to another job. Primary objective: eliminate CPU idle time Time shari ...
Operating Systems CIS 250
... • O/S - running process with address FFF0D • 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 counter; enab ...
... • O/S - running process with address FFF0D • 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 counter; enab ...
Authentication is the process of determining whether someone or
... A condition imposed by an operating system in 207 which only one process can hold a resource. In computer science, mutual exclusion refers to the requirement of ensuring that no two concurrent processes[a] are in their critical section at the same time; it is a basic requirement in concurrency contr ...
... A condition imposed by an operating system in 207 which only one process can hold a resource. In computer science, mutual exclusion refers to the requirement of ensuring that no two concurrent processes[a] are in their critical section at the same time; it is a basic requirement in concurrency contr ...
DOS - InfoShare.tk
... Makes an exact copy of a diskette, including hidden system files if they are present. Syntax: DISKCOPY [d1:] [d2:] ...
... Makes an exact copy of a diskette, including hidden system files if they are present. Syntax: DISKCOPY [d1:] [d2:] ...
Operating Systems
... For each user, the computer or network administrator establishes a user account, which enables a user to access, or log on to, a computer or a network. Each user account typically consists of a user name and password A user name, or user ID, is a unique combination of characters, such as letters ...
... For each user, the computer or network administrator establishes a user account, which enables a user to access, or log on to, a computer or a network. Each user account typically consists of a user name and password A user name, or user ID, is a unique combination of characters, such as letters ...
Operating Systems
... For each user, the computer or network administrator establishes a user account, which enables a user to access, or log on to, a computer or a network. Each user account typically consists of a user name and password A user name, or user ID, is a unique combination of characters, such as letters ...
... For each user, the computer or network administrator establishes a user account, which enables a user to access, or log on to, a computer or a network. Each user account typically consists of a user name and password A user name, or user ID, is a unique combination of characters, such as letters ...
The Mach System
... into the address space of a task. - Treated just like any other object. • Unlike traditional UNIX, which implied a contiguous virtual memory space Mach allowed for sparse address spaces, where regions of memory could be allocated from anywhere in the ...
... into the address space of a task. - Treated just like any other object. • Unlike traditional UNIX, which implied a contiguous virtual memory space Mach allowed for sparse address spaces, where regions of memory could be allocated from anywhere in the ...
Chapter 3: Operating System Structures
... • OS manages computer resources so that multiple processes can execute simultaneously – CPU scheduling – resource allocation, sharing & process synchronization – resource allocation ...
... • OS manages computer resources so that multiple processes can execute simultaneously – CPU scheduling – resource allocation, sharing & process synchronization – resource allocation ...
pdf
... Structure -- how is an operating system organized ? Concurrency -- how are parallel activities created and controlled ? Sharing -- how are resources shared among users ? Naming -- how are resources named by users or programs ? Protection -- how is one user/program protected from another ? Security - ...
... Structure -- how is an operating system organized ? Concurrency -- how are parallel activities created and controlled ? Sharing -- how are resources shared among users ? Naming -- how are resources named by users or programs ? Protection -- how is one user/program protected from another ? Security - ...
eFS: encrypted File system
... Certain implementations have also user level daemons running that call the kernel level programs ( e.g.: NFS) I am just describing one system architecture, each of the project team has to come up with their own creative designs. ...
... Certain implementations have also user level daemons running that call the kernel level programs ( e.g.: NFS) I am just describing one system architecture, each of the project team has to come up with their own creative designs. ...
Course Overview, History
... – Overlaps I/O processing of a job with computation of another – Benefits from I/O devices that can operate asynchronously – Requires the use of interrupts and DMA – Optimizes for throughput at the cost of response time ...
... – Overlaps I/O processing of a job with computation of another – Benefits from I/O devices that can operate asynchronously – Requires the use of interrupts and DMA – Optimizes for throughput at the cost of response time ...
Processes
... • Contact Bill Hogan ([email protected]) by 3:30 if you don’t have CSUGLab account or are not able to get to CMS ...
... • Contact Bill Hogan ([email protected]) by 3:30 if you don’t have CSUGLab account or are not able to get to CMS ...
Class 20 - OS 1.1. OS Introduction
... 1.1. What is an Operating System The three main purposes of an operating system: To provide an environment for a computer user to execute programs on computer hardware in a convenient and efficient manner (Shells, Windows, Terminals, Executable files concept). To allocate the separate resources ...
... 1.1. What is an Operating System The three main purposes of an operating system: To provide an environment for a computer user to execute programs on computer hardware in a convenient and efficient manner (Shells, Windows, Terminals, Executable files concept). To allocate the separate resources ...
COMS W1004 Introduction to Computer Science
... In order to port to other platforms, Thompson created a high-level programming language called B Dennis Ritchie created a better implementation called C Thompson and Ritchie rewrote UNIX in C ...
... In order to port to other platforms, Thompson created a high-level programming language called B Dennis Ritchie created a better implementation called C Thompson and Ritchie rewrote UNIX in C ...
WORD
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
Study Guide to Accompany Operating Systems Concepts 9 Ed by
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
doc
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
Operating system - Department of Computer Science
... z CPU is multiplexed among several jobs of several users that are kept in memory CPU is allocated to jobs in Round-Robin manner All active users must have a fair share of the CPU time: e.g. with 100 ms time quantum ...
... z CPU is multiplexed among several jobs of several users that are kept in memory CPU is allocated to jobs in Round-Robin manner All active users must have a fair share of the CPU time: e.g. with 100 ms time quantum ...
2140702
... 7. Write a menu driven shell script which will print the following menu and execute the given task. 8. MENU 9. Display calendar of current month 10. Display today’s date and time 11. Display usernames those are currently logged in the system 12. Display your name at given x, y position 13. Display y ...
... 7. Write a menu driven shell script which will print the following menu and execute the given task. 8. MENU 9. Display calendar of current month 10. Display today’s date and time 11. Display usernames those are currently logged in the system 12. Display your name at given x, y position 13. Display y ...