History of Unix OS - Seneca
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create a multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do one ...
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create a multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do one ...
System
... concurrently, resources must be allocated to each of them Many types of resources – Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. Accounting – To keep track of which users use how ...
... concurrently, resources must be allocated to each of them Many types of resources – Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. Accounting – To keep track of which users use how ...
2.1 Input Output Control System
... 1. The power supply send a signal to the component s in the system unit 2. The processor finds the ROM chip(s) that contain the BIOS (basic input output system) 3. The BIOS performs the POST(power-on self test), which checks components such as mouse, keyboard and adapter cards. ...
... 1. The power supply send a signal to the component s in the system unit 2. The processor finds the ROM chip(s) that contain the BIOS (basic input output system) 3. The BIOS performs the POST(power-on self test), which checks components such as mouse, keyboard and adapter cards. ...
Booting and Shutting Down UNIX Flavored Operating Systems
... The number of these processes vary in the various flavors of UNIX and Linux, but init is the common process throughout them all. The purpose of these system processes is to handle tasks that the kernel would handle but have been created separately for scheduling or architectural reasons. At th ...
... The number of these processes vary in the various flavors of UNIX and Linux, but init is the common process throughout them all. The purpose of these system processes is to handle tasks that the kernel would handle but have been created separately for scheduling or architectural reasons. At th ...
B - 周清江副教授
... (a) If the priority for P1 is 3, for P2 is 1, and for P3 is 2, draw the Gantt chart with the priority scheduling. (Note: process with priority 1 has the highest priority) What is the average turnaround time? (b) Draw the Gantt chart with the round-robin scheduling with time quantum 1. What is the av ...
... (a) If the priority for P1 is 3, for P2 is 1, and for P3 is 2, draw the Gantt chart with the priority scheduling. (Note: process with priority 1 has the highest priority) What is the average turnaround time? (b) Draw the Gantt chart with the round-robin scheduling with time quantum 1. What is the av ...
Exercises
... are easy to modify. No two system installations are the same, so each installation may want to tune the operating system to suit its needs. With mechanism and policy separate, the policy may be changed at will while the mechanism stays unchanged. This arrangement provides a more flexible system. 2.2 ...
... are easy to modify. No two system installations are the same, so each installation may want to tune the operating system to suit its needs. With mechanism and policy separate, the policy may be changed at will while the mechanism stays unchanged. This arrangement provides a more flexible system. 2.2 ...
Structure of Operating Systems
... • In the idle loop: – OS executes an infinite loop (UNIX) – OS performs some system management & profiling – OS halts the processor and enter in low-power mode (notebooks) – OS computes some function (DEC’s VMS on VAX computed Pi) • OS wakes up on: – interrupts from hardware devices – traps from use ...
... • In the idle loop: – OS executes an infinite loop (UNIX) – OS performs some system management & profiling – OS halts the processor and enter in low-power mode (notebooks) – OS computes some function (DEC’s VMS on VAX computed Pi) • OS wakes up on: – interrupts from hardware devices – traps from use ...
Introduction - Stanford Secure Computer Systems Group
... VM file IPC system sockets scheduler TCP/IP device device device driver ...
... VM file IPC system sockets scheduler TCP/IP device device device driver ...
Ch1 Introduction to the Linux Kernel
... The kernel typically resides in an elevated system state compared to normal user applications This includes a protected memory space and full access to the hardware This system state and memory space is collectively referred to as kernel-space ...
... The kernel typically resides in an elevated system state compared to normal user applications This includes a protected memory space and full access to the hardware This system state and memory space is collectively referred to as kernel-space ...
Unit OS 6: Principles of I/O Systems
... Device-independent I/O Software Functions of device-independent I/O software: Uniform interfacing for the device drivers Device naming ...
... Device-independent I/O Software Functions of device-independent I/O software: Uniform interfacing for the device drivers Device naming ...
Operating System Kernel More Virtual Stuff
... • A universe of gadgets – e.g. I/O devices – that do similar things slightly differently. What we’d like: • To listen to MP3s while reading email. • To access disk, network, and screen “simultaneously”. • To write a single program that does I/O with anybody’s disk. Plausible approaches: • An infinit ...
... • A universe of gadgets – e.g. I/O devices – that do similar things slightly differently. What we’d like: • To listen to MP3s while reading email. • To access disk, network, and screen “simultaneously”. • To write a single program that does I/O with anybody’s disk. Plausible approaches: • An infinit ...
COS 598: Advanced Operating System
... Can a race condition exist in the kernel? What tools are available to avoid race conditions? What is a zombie process? Name two scheduling algorithms? What is your favorite color? What is virtual memory? What is a logical (virtual) address? What is the purpose of a page table? ...
... Can a race condition exist in the kernel? What tools are available to avoid race conditions? What is a zombie process? Name two scheduling algorithms? What is your favorite color? What is virtual memory? What is a logical (virtual) address? What is the purpose of a page table? ...
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! ...
Operating Systems
... attempt to disrupt normal operation via illegal I/O instructions – All I/O instructions defined to be privileged – I/O must be performed via system calls • Memory-mapped and I/O port memory locations must be protected too ...
... attempt to disrupt normal operation via illegal I/O instructions – All I/O instructions defined to be privileged – I/O must be performed via system calls • Memory-mapped and I/O port memory locations must be protected too ...
Operating Systems
... with their application in practical exercises. The evaluation process will include the realization of a theoretical written exam and an individual practical programing work, which is also individually presented. If the classification of the theoretical exam is greater than or equal to 7 (0-20), the ...
... with their application in practical exercises. The evaluation process will include the realization of a theoretical written exam and an individual practical programing work, which is also individually presented. If the classification of the theoretical exam is greater than or equal to 7 (0-20), the ...
File System
... Runs most of its services in the kernel workspace Error prone due to the amount of tasks in the kernel itself Used in most Linux systems Runs most services - like networking, filesystem, etc. - in user space More stable, but more complex designs ...
... Runs most of its services in the kernel workspace Error prone due to the amount of tasks in the kernel itself Used in most Linux systems Runs most services - like networking, filesystem, etc. - in user space More stable, but more complex designs ...
Course objectives: 1. To learn the fundamentals of Operating
... output, inter process communication, network structure, security ...
... output, inter process communication, network structure, security ...
10B17CI307: UNIX Programming Lab
... with Windows OS. Overview to Open Source Software. Writing and studying about how to execute C program in Unix environment using GCC compiler along with phases of compilation. Executing simple Hello World C program in UNIX environment using ed / nano / pico editor. Working with the vi editor: Creati ...
... with Windows OS. Overview to Open Source Software. Writing and studying about how to execute C program in Unix environment using GCC compiler along with phases of compilation. Executing simple Hello World C program in UNIX environment using ed / nano / pico editor. Working with the vi editor: Creati ...
Operating System Structure
... – Keep track of which parts of memory are currently being used and by whom – Decide which processes to load when memory space becomes available – Allocate and deallocate memory space as needed ...
... – Keep track of which parts of memory are currently being used and by whom – Decide which processes to load when memory space becomes available – Allocate and deallocate memory space as needed ...
1. Operating system
... O/S moves pages to/from disk and memory as required a memory management unit (under control of O/S) maps memory references by a program to physical memory programs cannot access physical memory outside their own address space, e.g. operating system memory or memory allocated to other processes ...
... O/S moves pages to/from disk and memory as required a memory management unit (under control of O/S) maps memory references by a program to physical memory programs cannot access physical memory outside their own address space, e.g. operating system memory or memory allocated to other processes ...
OVERVIEW: Linux and Unix
... History of Unix • In April, 1969, Ken Thompson, Brian Kernighan and Dennis Ritchie sketched out an operating system that would meet Bell Labs' needs, soon become Unix. • In 1973, UNIX, was rewritten in C as Version 4 by Dennis Ritchie and Brian Kernighan. • Two major hot-beds of Unix development wer ...
... History of Unix • In April, 1969, Ken Thompson, Brian Kernighan and Dennis Ritchie sketched out an operating system that would meet Bell Labs' needs, soon become Unix. • In 1973, UNIX, was rewritten in C as Version 4 by Dennis Ritchie and Brian Kernighan. • Two major hot-beds of Unix development wer ...
Chapter 1: Intro to OS
... – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – A subset of total jobs in system is kept in memory – One job selected and run via job scheduling – When it has to wait (for I/O for example), OS switches to another job ...
... – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – A subset of total jobs in system is kept in memory – One job selected and run via job scheduling – When it has to wait (for I/O for example), OS switches to another job ...
This course is an introduction to computer operating systems
... MAC230 Comparative Operating Systems 3 Credits; 4 Hours (3 lecture, 1 lab) ...
... MAC230 Comparative Operating Systems 3 Credits; 4 Hours (3 lecture, 1 lab) ...