Operating Systems - Home - KSU Faculty Member websites
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
LECT03
... o Each job gets a predetermined “time slice” o At end of time slice current job is set aside and a new one starts o By rapidly shuffling jobs, illusion of several jobs executing simultaneously is created ...
... o Each job gets a predetermined “time slice” o At end of time slice current job is set aside and a new one starts o By rapidly shuffling jobs, illusion of several jobs executing simultaneously is created ...
Operating Systems - The College of Saint Rose
... then loads the operating system kernel and starts its ...
... then loads the operating system kernel and starts its ...
PPT - CS
... forbidden to access those portions of memory that have been allocated to the kernel or to other programs. • When a user mode process wants to use a service that is provided by the kernel (e.g. a system call), the system must switch temporarily into kernel mode. • Code running in kernel mode has acce ...
... forbidden to access those portions of memory that have been allocated to the kernel or to other programs. • When a user mode process wants to use a service that is provided by the kernel (e.g. a system call), the system must switch temporarily into kernel mode. • Code running in kernel mode has acce ...
Lecture 6: Kernel Structures and Threading
... Scheduling policy can be application specific. Portable, threading library provides as utilities. Blocking call in a thread can block all threads in the same processes. Multithreaded application cannot take advantage of multiprocessing. ...
... Scheduling policy can be application specific. Portable, threading library provides as utilities. Blocking call in a thread can block all threads in the same processes. Multithreaded application cannot take advantage of multiprocessing. ...
Chapter 3.1
... that is currently executing. • The actual contents of all programs are initially stored in persistent storage, such as a hard drive. • In order to be executed, a program must be loaded into random-access memory (RAM) and uniquely identified as a process. • In this way, multiple copies of the same pr ...
... that is currently executing. • The actual contents of all programs are initially stored in persistent storage, such as a hard drive. • In order to be executed, a program must be loaded into random-access memory (RAM) and uniquely identified as a process. • In this way, multiple copies of the same pr ...
What is an operating system (OS)?
... 3) Restrict a user program to its allocated address space. In a simple computer, a user program might be allocated a single continguous address space in memory. The two special purpose CPU registers: StartMemory and EndMemory can bracket the user program's address space. All memory addresses that th ...
... 3) Restrict a user program to its allocated address space. In a simple computer, a user program might be allocated a single continguous address space in memory. The two special purpose CPU registers: StartMemory and EndMemory can bracket the user program's address space. All memory addresses that th ...
System software - Information Technology
... • Protection is achieved by having the operating system to have full control over the resources of the system (processor, memory and I/O devices) • Virtual memory is one of the techniques used to achieve protection between programs – Each program operates as if it were the only program on the comput ...
... • Protection is achieved by having the operating system to have full control over the resources of the system (processor, memory and I/O devices) • Virtual memory is one of the techniques used to achieve protection between programs – Each program operates as if it were the only program on the comput ...
Computer Operating Systems (COP 4610)
... To learn the basic elements of Operating Systems To understand basic concepts of the structure and architecture of an operating system To learn how processes are managed including, scheduling, creation, and termination To learn basic process synchronization mechanisms To understand the problem of de ...
... To learn the basic elements of Operating Systems To understand basic concepts of the structure and architecture of an operating system To learn how processes are managed including, scheduling, creation, and termination To learn basic process synchronization mechanisms To understand the problem of de ...
Chapter 02: Operating System Overview
... – Privileged instructions are executed – Protected areas of memory may be accessed ...
... – Privileged instructions are executed – Protected areas of memory may be accessed ...
Document
... The operation of the computer memory involves both hardware and OS concepts; this maerial in Chapter 5 also prepares you for the discussion in Chapter 10 of the OS textbook. Movement of data from the processor to the cache to main memory to the disk drive is a multifaceted process. The disk drive as ...
... The operation of the computer memory involves both hardware and OS concepts; this maerial in Chapter 5 also prepares you for the discussion in Chapter 10 of the OS textbook. Movement of data from the processor to the cache to main memory to the disk drive is a multifaceted process. The disk drive as ...
Lecture 1
... the execution of one command, it seeks the next “control statement” not from a card reader, but rather from the user’s keyboard. •On line file system must be available for users to access data and code. ...
... the execution of one command, it seeks the next “control statement” not from a card reader, but rather from the user’s keyboard. •On line file system must be available for users to access data and code. ...
ppt
... Humans Expensive • Turn around time 1/2 day • Programmer time wasted! “Sigh. In the good old days….” – Time-sharing – Multics (sorta) – New problems ...
... Humans Expensive • Turn around time 1/2 day • Programmer time wasted! “Sigh. In the good old days….” – Time-sharing – Multics (sorta) – New problems ...
Operating Systems Operating System Component and Structure
... • Each of these activities is encapsulated in a process – a process includes the execution context • PC, registers, VM, OS resources (e.g., open files), etc… • plus the program itself (code and data) – the OS’s process module manages these processes • creation, destruction, scheduling, … ...
... • Each of these activities is encapsulated in a process – a process includes the execution context • PC, registers, VM, OS resources (e.g., open files), etc… • plus the program itself (code and data) – the OS’s process module manages these processes • creation, destruction, scheduling, … ...
Operating System Overview
... – Privileged instructions are executed – Protected areas of memory may be accessed ...
... – Privileged instructions are executed – Protected areas of memory may be accessed ...
Operating Systems
... – Privileged instructions are executed – Protected areas of memory may be accessed ...
... – Privileged instructions are executed – Protected areas of memory may be accessed ...
CS4023_-_lecture_05_-_0910
... 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 system concepts
... • Time-shared resources: CPU and network • Space-shared resources: memory and disk • Exhaustible: energy ...
... • Time-shared resources: CPU and network • Space-shared resources: memory and disk • Exhaustible: energy ...
Operating System Structure
... Security manager • The Security manager provides a mechanism for controlling access by programs, processes, or users to both system and user resources • The protection mechanism must: – distinguish between authorized and unauthorized usage – specify the controls to be imposed – provide a means of e ...
... Security manager • The Security manager provides a mechanism for controlling access by programs, processes, or users to both system and user resources • The protection mechanism must: – distinguish between authorized and unauthorized usage – specify the controls to be imposed – provide a means of e ...