Multitasking (Time sharing)
... the entire computer system is dedicated to his use, even though it is being shared among many users. A time-shared operating system uses CPU scheduling and multiprogramming to provide each user with a small portion of a time-shared computer. Each user has at least one Separate program in memory. A p ...
... the entire computer system is dedicated to his use, even though it is being shared among many users. A time-shared operating system uses CPU scheduling and multiprogramming to provide each user with a small portion of a time-shared computer. Each user has at least one Separate program in memory. A p ...
MIDTERM #1 WITH SOLUTIONS - School of Computer Science
... 39. An advantage to using a higher-level language to implement an operating system is ___________ . A) the system can be understood by all users B) modern computer science students do not learn machine language programming C) an operating system is far easier to port to some other hardware if it is ...
... 39. An advantage to using a higher-level language to implement an operating system is ___________ . A) the system can be understood by all users B) modern computer science students do not learn machine language programming C) an operating system is far easier to port to some other hardware if it is ...
l34
... Graphical User Interface too costly (and not yet invented) This perspective faded with time and began to disappear with advent of the microprocessor: Cheap CPU time. ...
... Graphical User Interface too costly (and not yet invented) This perspective faded with time and began to disappear with advent of the microprocessor: Cheap CPU time. ...
Review
... • A state is said to be safe, if it has a process sequence {P1, P2,…, Pn}, such that for each Pi, the resources that Pi can still request can be satisfied by the currently available resources plus the resources held by all Pj, where j < i • State is safe because OS can definitely avoid deadlock – by ...
... • A state is said to be safe, if it has a process sequence {P1, P2,…, Pn}, such that for each Pi, the resources that Pi can still request can be satisfied by the currently available resources plus the resources held by all Pj, where j < i • State is safe because OS can definitely avoid deadlock – by ...
COS 318: Operating Systems OS Structures and System Calls Andy Bavier
... Load and read system registers Change processor modes from kernel to user Change the voltage and frequency of processor Halt a processor Reset a processor Perform I/O operations ...
... Load and read system registers Change processor modes from kernel to user Change the voltage and frequency of processor Halt a processor Reset a processor Perform I/O operations ...
Process Description and Control
... the mode, for example the CHM (CHange Mode) instruction on the VAX1 machines. When the user makes a system service call or when an interrupt transfers control to a system routine, the routine executes CHM to enter the kernel mode ...
... the mode, for example the CHM (CHange Mode) instruction on the VAX1 machines. When the user makes a system service call or when an interrupt transfers control to a system routine, the routine executes CHM to enter the kernel mode ...
Slide Set 1
... It includes * The program itself (program segment) * The program’s data (data segment, stack, heap) * Open files * The execution context ...
... It includes * The program itself (program segment) * The program’s data (data segment, stack, heap) * Open files * The execution context ...
1. Operating system
... 1. Computer system consists of : • Hardware (monitor, keyboard, case, motherboard, disk drives, etc ) • System Software (operating systems, compilers, etc) ...
... 1. Computer system consists of : • Hardware (monitor, keyboard, case, motherboard, disk drives, etc ) • System Software (operating systems, compilers, etc) ...
Operating System principles And Multitasking
... simultaneously. Since each action or command in a time-shared system tends to be short, only a little CPU time is needed for each user. As the system switches CPU rapidly from one user/program to the next, each user is given the impression that he/she has his/her own CPU, whereas actually one CPU is ...
... simultaneously. Since each action or command in a time-shared system tends to be short, only a little CPU time is needed for each user. As the system switches CPU rapidly from one user/program to the next, each user is given the impression that he/she has his/her own CPU, whereas actually one CPU is ...
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 ...
Introduction - Faruk Hadziomerovic
... Intensive I/O one needs many jobs ready to run (in memory). So when Job1 needs I/O CPU waiting for data in/out (spooling – Simultaneous Peripheral Operation On Line) Job 2 can run by CPU, or Job3 etc. Consequence: short jobs wait disproportional time to finish due to the long jobs. With multi-users ...
... Intensive I/O one needs many jobs ready to run (in memory). So when Job1 needs I/O CPU waiting for data in/out (spooling – Simultaneous Peripheral Operation On Line) Job 2 can run by CPU, or Job3 etc. Consequence: short jobs wait disproportional time to finish due to the long jobs. With multi-users ...
Lecture 1: Overview - City University of New York
... Timer – prevent the job run infinitely Privileged Instruction ...
... Timer – prevent the job run infinitely Privileged Instruction ...
Process Concept
... operating system must select, for scheduling purposes, processes from these queues in some fashion. The appropriate scheduler carries out this selection process. The Long-term scheduler (or job scheduler) selects which processes should be brought into the ready queue, from the job pool that is the l ...
... operating system must select, for scheduling purposes, processes from these queues in some fashion. The appropriate scheduler carries out this selection process. The Long-term scheduler (or job scheduler) selects which processes should be brought into the ready queue, from the job pool that is the l ...
Chapter 1 Computer System Overview
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
Operating System
... its logical conclusion. The fundamental idea behind a virtual machine is to abstract the hardware of single computer into several different execution environments , thereby creating the illusion that each separate execution environment is running its own private computer. By using CPU scheduling ...
... its logical conclusion. The fundamental idea behind a virtual machine is to abstract the hardware of single computer into several different execution environments , thereby creating the illusion that each separate execution environment is running its own private computer. By using CPU scheduling ...
Overview and History
... Linux history Linux is a modern, free operating system based on UNIX standards first developed as a small but self-contained kernel in 1991 by Linus Torvalds, with the major design goal of UNIX compatibility. its history has been one of collaboration by many users from all around the world, cor ...
... Linux history Linux is a modern, free operating system based on UNIX standards first developed as a small but self-contained kernel in 1991 by Linus Torvalds, with the major design goal of UNIX compatibility. its history has been one of collaboration by many users from all around the world, cor ...
Processes and Threads
... Process Management • Process management is a major function of the OS • OS manages CPU sharing with several processes in memory at the same time • The concept above is called multiprogramming ...
... Process Management • Process management is a major function of the OS • OS manages CPU sharing with several processes in memory at the same time • The concept above is called multiprogramming ...
interrupt - Universidade de Coimbra
... Virtual Memory is based on having a table that translates ...
... Virtual Memory is based on having a table that translates ...
quiz1-s3
... BSD UNIX c) Linux d) PCLinuxOS True or False 4. Interrupts may be triggered by either hardware or software. 5. A dual-core system requires each core has its own memory. ...
... BSD UNIX c) Linux d) PCLinuxOS True or False 4. Interrupts may be triggered by either hardware or software. 5. A dual-core system requires each core has its own memory. ...
CS5460: Operating Systems
... – Device drivers read/write registers to control device » Memory-mapped I/O: registers mapped to special addresses » Programmed I/O: special instructions to read/write registers – Registers may look like memory but they don t act like it! ...
... – Device drivers read/write registers to control device » Memory-mapped I/O: registers mapped to special addresses » Programmed I/O: special instructions to read/write registers – Registers may look like memory but they don t act like it! ...
Overview - Seattle University
... – 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 computer system may want to control use of that information, concurrent processes should not interfere with each othe ...
... – 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 computer system may want to control use of that information, concurrent processes should not interfere with each othe ...
Computer Hardware and Software Infrastructure Operating System
... sure that it does not overcommit memory or processing time by admitting too many processes to the system. ...
... sure that it does not overcommit memory or processing time by admitting too many processes to the system. ...
Midterm-2006-7-1-Solution
... also called a task control block. The PCB is special data structure that stores various information related to a process. The information stored in the PCB includes: Process state – new, ready, running, waiting... Process identification information Unique process identifier (PID) - indexes (di ...
... also called a task control block. The PCB is special data structure that stores various information related to a process. The information stored in the PCB includes: Process state – new, ready, running, waiting... Process identification information Unique process identifier (PID) - indexes (di ...