on Processes
... privileged(kernel-mode) and non-privileged (user-mode) for protection reasons the portion of the OS executed in kernel-mode is called kernel (basic functions which must be protected from interference by user programs) in kernel-mode the OS can do anything (no protection) user processes execute in ...
... privileged(kernel-mode) and non-privileged (user-mode) for protection reasons the portion of the OS executed in kernel-mode is called kernel (basic functions which must be protected from interference by user programs) in kernel-mode the OS can do anything (no protection) user processes execute in ...
Chapter 2: System Structures
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program ...
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program ...
第六章文件系统
... Multiple processes must be able to access the information concurrently The usual solution to all these problems is to store information on disks and other external media in units called files. ...
... Multiple processes must be able to access the information concurrently The usual solution to all these problems is to store information on disks and other external media in units called files. ...
Slides
... There are none The best one can do is collect together a sequence of contiguous (or nearby) sectors for writing Write them in a single sequence of disk actions Caching for later writing is (usually) a bad idea Application has no confidence that data is actually written before a failure ...
... There are none The best one can do is collect together a sequence of contiguous (or nearby) sectors for writing Write them in a single sequence of disk actions Caching for later writing is (usually) a bad idea Application has no confidence that data is actually written before a failure ...
Table of Contents Table of Contents
... example; putting hardware, setting up and eliminating software, controls user accounts and changes several accessibility alternatives. Additional applets can always be around by means of third party software. The Control Panel is a special part of the Microsoft Windows operating system since its 1st ...
... example; putting hardware, setting up and eliminating software, controls user accounts and changes several accessibility alternatives. Additional applets can always be around by means of third party software. The Control Panel is a special part of the Microsoft Windows operating system since its 1st ...
CS4513 Distributed Computing Systems
... Network OS’s are not transparent. Distributed OS’s are not independent of computers. ...
... Network OS’s are not transparent. Distributed OS’s are not independent of computers. ...
Operating System Architecture
... – many programs and blocks of data must reside in main memory concurrently – the memory manager must • find and assign memory space for these needs and • ensure that the actions of each program are restricted to the program’s allotted space ...
... – many programs and blocks of data must reside in main memory concurrently – the memory manager must • find and assign memory space for these needs and • ensure that the actions of each program are restricted to the program’s allotted space ...
Application Software Read/Write Standard Output Device Control
... Copyright ©: University of Illinois CS 241 Staff ...
... Copyright ©: University of Illinois CS 241 Staff ...
Diploma in Computer Systems and Network Technology
... This course provides a critical examination of issues embedded in the practice of providing client service. Topics include research about best practice in customer service and communication techniques; psychologically based methods for dealing with the management of customer complaints; and the role ...
... This course provides a critical examination of issues embedded in the practice of providing client service. Topics include research about best practice in customer service and communication techniques; psychologically based methods for dealing with the management of customer complaints; and the role ...
Module 4: Processes
... Mechanics of a Context Switch 1 copy contents of CPU registers (general-purpose, SP, PC, PSW, etc.) into a save area in the PCB of running process 2 change status of running process from “running” to “waiting” (or “ready”) 3 change a system variable running-process to point to the PCB of new proces ...
... Mechanics of a Context Switch 1 copy contents of CPU registers (general-purpose, SP, PC, PSW, etc.) into a save area in the PCB of running process 2 change status of running process from “running” to “waiting” (or “ready”) 3 change a system variable running-process to point to the PCB of new proces ...
Messenger-Based Operating Systems - (CUI)
... To provide a response to this question one must examine the set of high-level services offered by a microkernel, especially the services which span several CPUs and provide “location transparency” (server addresses and capabilities) or which depend on specific protocols and server processes (memory ...
... To provide a response to this question one must examine the set of high-level services offered by a microkernel, especially the services which span several CPUs and provide “location transparency” (server addresses and capabilities) or which depend on specific protocols and server processes (memory ...
Operating Systems I: Chapter 4
... In a multiple threaded task, while one server thread is blocked and waiting, a second thread in the same task can run. – Threads provide a mechanism that allow sequential processes to make blocking system calls while also achieving parallelism. – Cooperation of multiple threads in same job confers h ...
... In a multiple threaded task, while one server thread is blocked and waiting, a second thread in the same task can run. – Threads provide a mechanism that allow sequential processes to make blocking system calls while also achieving parallelism. – Cooperation of multiple threads in same job confers h ...
Memory manager
... Each program to be executed was called a job. A programmer who wished to execute a job sent a request to the operating room along with punched cards for the program and data. Operating systems only ensured that all of the resources were transferred from one job to the next. ...
... Each program to be executed was called a job. A programmer who wished to execute a job sent a request to the operating room along with punched cards for the program and data. Operating systems only ensured that all of the resources were transferred from one job to the next. ...
Lecture 1: Course Introduction and Overview
... – Process requests a system service, e.g., exit – Like a function call, but “outside” the process – Does not have the address of the system function to call – Like a Remote Procedure Call (RPC) – for later – Marshall the syscall ID and arguments in registers and execute ...
... – Process requests a system service, e.g., exit – Like a function call, but “outside” the process – Does not have the address of the system function to call – Like a Remote Procedure Call (RPC) – for later – Marshall the syscall ID and arguments in registers and execute ...
Slides
... NFS is standard UNIX client-server file sharing protocol CIFS is standard Windows protocol Standard operating system file calls are translated into remote calls ...
... NFS is standard UNIX client-server file sharing protocol CIFS is standard Windows protocol Standard operating system file calls are translated into remote calls ...
What is an Operating System?
... • Memory management is key to multiprogramming • Memory is a space sharing resource • Memory management is necessary to protect co-residing programs from each other • Depending on the occupancy pattern, a program would not know the location until load time ...
... • Memory management is key to multiprogramming • Memory is a space sharing resource • Memory management is necessary to protect co-residing programs from each other • Depending on the occupancy pattern, a program would not know the location until load time ...
slides - Simon Fraser University
... Single user cannot keep CPU and I/O devices busy at all times ...
... Single user cannot keep CPU and I/O devices busy at all times ...
GX3512131216
... automatically come when we load EMBEDDED LINUX related kernel. Root File System: File system will tell how the files are arranged in the internal standard storage devices. In embedded Linux, kernel treats everything as a file even the input and output devices also. In embedded Linux, Root is the par ...
... automatically come when we load EMBEDDED LINUX related kernel. Root File System: File system will tell how the files are arranged in the internal standard storage devices. In embedded Linux, kernel treats everything as a file even the input and output devices also. In embedded Linux, Root is the par ...
Chapter 1 (Part 2) Introduction to Operating System
... A master processor controls the system. The other processors either look to the master for instructions or have predefined tasks. Thus, this defines a master-slave relationship master processor schedules and allocated work to slave processors. More common in extremely large systems ...
... A master processor controls the system. The other processors either look to the master for instructions or have predefined tasks. Thus, this defines a master-slave relationship master processor schedules and allocated work to slave processors. More common in extremely large systems ...
CS 519 -- Operating Systems -
... User can read/write only in fixed sized blocks Unlike other devices, block devices support random access We can read or write anywhere in the device without having to ‘read all the bytes first’ ...
... User can read/write only in fixed sized blocks Unlike other devices, block devices support random access We can read or write anywhere in the device without having to ‘read all the bytes first’ ...
pdf book chapter - LIRA-Lab
... execution. In contrast, in user mode, memory and register access is restricted. For example, an application will not be allowed to access memory locations that lie outside a range of addresses (set by the operating system), or directly access device registers. While executing operating system code, ...
... execution. In contrast, in user mode, memory and register access is restricted. For example, an application will not be allowed to access memory locations that lie outside a range of addresses (set by the operating system), or directly access device registers. While executing operating system code, ...
Modern Operating System - Tanenbaum solution 3rd
... 2. You could have a register containing a pointer to the current process table entry. When I/O completed, the CPU would store the current machine state in the current process table entry. Then it would go to the interrupt vector for the interrupting device and fetch a pointer to another process tabl ...
... 2. You could have a register containing a pointer to the current process table entry. When I/O completed, the CPU would store the current machine state in the current process table entry. Then it would go to the interrupt vector for the interrupting device and fetch a pointer to another process tabl ...
Midterm-2006-7-1-Solution
... b. (i), (ii), and (iii) c. (i), (ii), and (iv) d. (ii), (iii), and (iv) 5. A process switch may occur when i. A process terminates ii. a process moves to the I/O queue iii. A process makes a supervisor call iv. A process is interrupted due to a timer interrupt a. All of the above b. (i) and (ii) c. ...
... b. (i), (ii), and (iii) c. (i), (ii), and (iv) d. (ii), (iii), and (iv) 5. A process switch may occur when i. A process terminates ii. a process moves to the I/O queue iii. A process makes a supervisor call iv. A process is interrupted due to a timer interrupt a. All of the above b. (i) and (ii) c. ...
IV. Parallel Operating Systems
... SISD - Single Instruction Single Data. This is the most widespread architecture where a single processor executes a sequence of instructions that operate on a single stream of data. Examples of this architecture are the majority of computers in use nowadays such as personal computers (with some exce ...
... SISD - Single Instruction Single Data. This is the most widespread architecture where a single processor executes a sequence of instructions that operate on a single stream of data. Examples of this architecture are the majority of computers in use nowadays such as personal computers (with some exce ...