Operating-System Structures
... system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - CPU cycles, main memory, file storage, I/O devices. Accounting - To keep track of which users use how much a ...
... system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - CPU cycles, main memory, file storage, I/O devices. Accounting - To keep track of which users use how much a ...
Week 1
... • On the other hand if we can have the CPU do something else while it is waiting for a resource we can make better use of the CPU resource – we won’t waste as much of the capability of the resource • If we were to do this then we would be able to share the CPU resource among more than a single task ...
... • On the other hand if we can have the CPU do something else while it is waiting for a resource we can make better use of the CPU resource – we won’t waste as much of the capability of the resource • If we were to do this then we would be able to share the CPU resource among more than a single task ...
ApplicationSecurity
... new processes and end them. – Memory management: Operating Systems allocate memory and manage the memory (e.g., free memory) etc., when processes are being executed. – Process scheduling: When multiple processes are competing with each other to run on ONE CPU, an OS is responsible for scheduling whi ...
... new processes and end them. – Memory management: Operating Systems allocate memory and manage the memory (e.g., free memory) etc., when processes are being executed. – Process scheduling: When multiple processes are competing with each other to run on ONE CPU, an OS is responsible for scheduling whi ...
Processes - UCSB Computer Science
... Process executes last statement and asks the operating system to ...
... Process executes last statement and asks the operating system to ...
File System - dhdurso.org index to available resources
... – unique process identifier – scheduling information (e.g., priority) – pointers to other control blocks The virtual address space of a user process is divided into text (program code), data, and stack segments. Every process with sharable text has a pointer form its process structure to a text stru ...
... – unique process identifier – scheduling information (e.g., priority) – pointers to other control blocks The virtual address space of a user process is divided into text (program code), data, and stack segments. Every process with sharable text has a pointer form its process structure to a text stru ...
How do Users and Processes interact with the Operating System
... problems to convince the guest operating system that it is running in privileged CPU mode when in fact it is not. Consider a scenario where a process of the guest operating system raises a divide-by-zero error. Without special intervention, this would cause the host operating system immediately to h ...
... problems to convince the guest operating system that it is running in privileged CPU mode when in fact it is not. Consider a scenario where a process of the guest operating system raises a divide-by-zero error. Without special intervention, this would cause the host operating system immediately to h ...
CS 519: Operating System Theory
... A computer is a piece of hardware that runs the fetch-decode-execute loop Next slides: walk through a very simple computer to illustrate Machine organization What the pieces are and how they fit together ...
... A computer is a piece of hardware that runs the fetch-decode-execute loop Next slides: walk through a very simple computer to illustrate Machine organization What the pieces are and how they fit together ...
Section for Related Work % \section{Related Work} Rootkit detection
... methods on smartphones such as Android. But, given the fact that the Android framework is built on top of the Linux kernel, many of the proposed methods to detect rootkits on traditional operating systems still apply to at least some extent. There are a number of significant differences between serv ...
... methods on smartphones such as Android. But, given the fact that the Android framework is built on top of the Linux kernel, many of the proposed methods to detect rootkits on traditional operating systems still apply to at least some extent. There are a number of significant differences between serv ...
Lecture-4
... Fixed priority scheduling; (i.e., serve all from foreground then from background). Danger of starvation. Time slice – each queue gets a certain amount of CPU time which it can schedule amongst its processes; i.e., 80% to foreground in RR 20% to background in FCFS ...
... Fixed priority scheduling; (i.e., serve all from foreground then from background). Danger of starvation. Time slice – each queue gets a certain amount of CPU time which it can schedule amongst its processes; i.e., 80% to foreground in RR 20% to background in FCFS ...
operation
... • Clear kernel interface supports modular structure. • Realization of services outside the kernel: • leads to more security and stability since the kernel will not be affected by faulty services, • improves flexibility and extendibility since services can be added and removed arbitrarily, even durin ...
... • Clear kernel interface supports modular structure. • Realization of services outside the kernel: • leads to more security and stability since the kernel will not be affected by faulty services, • improves flexibility and extendibility since services can be added and removed arbitrarily, even durin ...
ch01.pdf
... Operating System Structure (cont.) Timesharing (multitasking) is logical extension of multiprogramming in 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 ...
... Operating System Structure (cont.) Timesharing (multitasking) is logical extension of multiprogramming in 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 ...
Document
... spinlocks only to protect short code segments. A thread will never be preempted while holding a spinlock. Also provides dispatcher objects which may act as either mutexes and semaphores ...
... spinlocks only to protect short code segments. A thread will never be preempted while holding a spinlock. Also provides dispatcher objects which may act as either mutexes and semaphores ...
What is an Operating System?
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
Document
... – Object program to be executed (called the program text in Unix) – The input data to be processed (obtained from a file, interactively or by other means) and the results it produces – Resources required by the program (i.e. files, etc..) – PCB – Process Control Block, containing the state of the pr ...
... – Object program to be executed (called the program text in Unix) – The input data to be processed (obtained from a file, interactively or by other means) and the results it produces – Resources required by the program (i.e. files, etc..) – PCB – Process Control Block, containing the state of the pr ...
introduction to unix system
... • The UNIX operating system is made up of three parts; the kernel, the shell and the programs. • The kernel – The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to system calls. – As an illustration ...
... • The UNIX operating system is made up of three parts; the kernel, the shell and the programs. • The kernel – The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to system calls. – As an illustration ...
Lecture 1: Course Introduction and Overview
... – Does the programmer need to write a single program that performs many independent activities? – Does every program have to be altered for every ...
... – Does the programmer need to write a single program that performs many independent activities? – Does every program have to be altered for every ...
1.1. The UNIX Operating System
... an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that are waiting for I/O operations to complete to make way for programs that can use the CPU more pr ...
... an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that are waiting for I/O operations to complete to make way for programs that can use the CPU more pr ...
資工系網媒所NEWS實驗室Chapter 13
... Swap-space can be carved out of the normal file system, or, more commonly, it can be in a separate disk partition. Swap-space management 4.3BSD allocates swap space when process starts; holds text segment (the program) and data segment. Kernel uses swap maps to track swap-space use. Solaris 2 alloca ...
... Swap-space can be carved out of the normal file system, or, more commonly, it can be in a separate disk partition. Swap-space management 4.3BSD allocates swap space when process starts; holds text segment (the program) and data segment. Kernel uses swap maps to track swap-space use. Solaris 2 alloca ...
G2_Survey_SynchronizationTools
... than one process simultaneously. These sections of code usually access shared variables in a common store or access shared hardware. • The standard solution to kernel-level mutualexclusion in uniprocessor systems is to momentarily disable interrupts to guarantee that the process accessing the sensit ...
... than one process simultaneously. These sections of code usually access shared variables in a common store or access shared hardware. • The standard solution to kernel-level mutualexclusion in uniprocessor systems is to momentarily disable interrupts to guarantee that the process accessing the sensit ...
Using Linux Kernel Modules For Operating Systems Class Projects
... The second project is to write a program that reports the behavior of the system from the various files in the /proc file system. This project establishes an understanding of /proc files which are used in the kernel module projects. This is Lab 3.1 as described in Nutt's text book.7 The third projec ...
... The second project is to write a program that reports the behavior of the system from the various files in the /proc file system. This project establishes an understanding of /proc files which are used in the kernel module projects. This is Lab 3.1 as described in Nutt's text book.7 The third projec ...