Module 3: Operating
... Program execution – system capability to load a program into memory and to run it. I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and ...
... Program execution – system capability to load a program into memory and to run it. I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and ...
Processes
... separate entity that operates in privileged mode Execution Within User Processes Operating system software within context of a user process Process executes in privileged mode when executing operating system code ...
... separate entity that operates in privileged mode Execution Within User Processes Operating system software within context of a user process Process executes in privileged mode when executing operating system code ...
08_Operating System Support
... Memory Management • Uni-program —Memory split into two —One for Operating System —One for currently executing program ...
... Memory Management • Uni-program —Memory split into two —One for Operating System —One for currently executing program ...
CHAP3
... Suspended Processes Processor is faster than I/O - some processes could be waiting for I/O Swap these processes to disk to free up more memory Blocked state becomes suspend state when swapped to disk ...
... Suspended Processes Processor is faster than I/O - some processes could be waiting for I/O Swap these processes to disk to free up more memory Blocked state becomes suspend state when swapped to disk ...
Lec3
... – Easier for operating system builder: get rid of problem of concurrency by defining it away. – For personal computers, idea was: one user does only one thing at a time. – Harder for user: can’t work while waiting for printer ...
... – Easier for operating system builder: get rid of problem of concurrency by defining it away. – For personal computers, idea was: one user does only one thing at a time. – Harder for user: can’t work while waiting for printer ...
Operating Systems
... – Mode bit provided by hardware • Provides ability to distinguish when system is running user code or kernel code • Some instructions designated as privileged, only executable in kernel mode • System call changes mode to kernel, return from call resets it to user ...
... – Mode bit provided by hardware • Provides ability to distinguish when system is running user code or kernel code • Some instructions designated as privileged, only executable in kernel mode • System call changes mode to kernel, return from call resets it to user ...
OPERATING SYSTEM
... COMPUTER HARWARE REVIEW An operating system is intimately (closely) tied to the hardware of the computer it runs on. It makes easy the usage of the computer’s instruction set and manages its resources. OS must know a great deal about the hardware ...
... COMPUTER HARWARE REVIEW An operating system is intimately (closely) tied to the hardware of the computer it runs on. It makes easy the usage of the computer’s instruction set and manages its resources. OS must know a great deal about the hardware ...
Operating System
... L-T-P-Cr: 3-1-0-4 Objectives: To give in-depth concept of any general Operating System. Outcomes: Students should be able to use his knowledge to develop/design any new Operating System. UNIT I Lectures: 14 Introduction: Introduction to OS. Operating system functions, evaluation of O.S., Different t ...
... L-T-P-Cr: 3-1-0-4 Objectives: To give in-depth concept of any general Operating System. Outcomes: Students should be able to use his knowledge to develop/design any new Operating System. UNIT I Lectures: 14 Introduction: Introduction to OS. Operating system functions, evaluation of O.S., Different t ...
ppt
... Extra Credit for Friday • Write a simple UNIX program to simulate the UNIX shell in a “read/fork/exec” loop – don’t bother with path searches. All commands ...
... Extra Credit for Friday • Write a simple UNIX program to simulate the UNIX shell in a “read/fork/exec” loop – don’t bother with path searches. All commands ...
Operating Systems - Cardiff University
... – CPU operations take less time than I/O – When a process waits for I/O operation, OS swaps to another process. ...
... – CPU operations take less time than I/O – When a process waits for I/O operation, OS swaps to another process. ...
Chapter 1: Introduction
... Timesharing (multitasking) is logical extension 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 – program loaded in memory process – If several processes ready to run at the same ...
... Timesharing (multitasking) is logical extension 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 – program loaded in memory process – If several processes ready to run at the same ...
William Stallings Computer Organization and Architecture
... Allows programs to be altered and recompiled independently, without re-linking and re-loading Lends itself to sharing among processes Lends itself to protection Some systems combine segmentation with ...
... Allows programs to be altered and recompiled independently, without re-linking and re-loading Lends itself to sharing among processes Lends itself to protection Some systems combine segmentation with ...
Operating Systems
... Several programs are arranged in the memory at the same time by the OS The OS runs one program until it has to do I/O (executed by some other small computers), then the OS selects another program to run When the first program finishes its I/O task, it will wait for the 2nd program finishes or tries ...
... Several programs are arranged in the memory at the same time by the OS The OS runs one program until it has to do I/O (executed by some other small computers), then the OS selects another program to run When the first program finishes its I/O task, it will wait for the 2nd program finishes or tries ...
OperatingSystems
... the time that it takes for each process to complete its task increases. However, the overall system productivity These simultaneously executing programs are called tasks. Therefore, a system with the capability of multitasking allows users to activate more than one task, or application program, at a ...
... the time that it takes for each process to complete its task increases. However, the overall system productivity These simultaneously executing programs are called tasks. Therefore, a system with the capability of multitasking allows users to activate more than one task, or application program, at a ...
03_shells_and_processes
... multiprogramming and multitasking – Multiprogramming systems switch the running process when that process requires I/O. – Multitasking systems periodically switch the running process after some (typically minute) period of time ...
... multiprogramming and multitasking – Multiprogramming systems switch the running process when that process requires I/O. – Multitasking systems periodically switch the running process after some (typically minute) period of time ...
COS 318: Operating Systems OS Structures and System Calls Prof. Margaret Martonosi
... 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
... • When the OS is ready to start executing a new process, it loads the hardware registers from the values stored in that process’ PCB. • The process of switching the CPU from one process to another is called a context switch. Timesharing systems may do 100s or 1000s of context switches a second! ...
... • When the OS is ready to start executing a new process, it loads the hardware registers from the values stored in that process’ PCB. • The process of switching the CPU from one process to another is called a context switch. Timesharing systems may do 100s or 1000s of context switches a second! ...
2005-07.pdf
... The issue here is that multi-level page tables are mainly useful for processes that don’t need a lot of memory, for in that case you would just be wasting space by keeping the complete table in memory. For a process using a lot of memory, you will need to access lots of page references in memory any ...
... The issue here is that multi-level page tables are mainly useful for processes that don’t need a lot of memory, for in that case you would just be wasting space by keeping the complete table in memory. For a process using a lot of memory, you will need to access lots of page references in memory any ...
Lecture 4: September 11 4.1 Processes 4.2 Memory and Secondary
... that has the ability to run several computer programs concurrently. A computer program itself is just a passive collection of instructions, while a process is the actual execution of those instructions. Several processes may be associated with the same program; for example, opening up several window ...
... that has the ability to run several computer programs concurrently. A computer program itself is just a passive collection of instructions, while a process is the actual execution of those instructions. Several processes may be associated with the same program; for example, opening up several window ...
virtual machine
... Operating System Services (Cont.) • Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them – Accounting - To keep ...
... Operating System Services (Cont.) • Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them – Accounting - To keep ...
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Computer Review
... memory to get an instruction or data takes much longer than executing instructions, all CPU's contain registers inside to hold key variables and temporary results. Thus the instruction set generally contain instructions to load a word from memory into a register aand store a word from a register int ...
... memory to get an instruction or data takes much longer than executing instructions, all CPU's contain registers inside to hold key variables and temporary results. Thus the instruction set generally contain instructions to load a word from memory into a register aand store a word from a register int ...
Chapter 2.pdf
... • Programming interface to the services provided by the OS – i.e. interface provided to applications • Are called by a running program to get services • Typically written in a high-level language (C or C++) • Machine dependent, but can be invoked by standard procedure libraries • Even a simple progr ...
... • Programming interface to the services provided by the OS – i.e. interface provided to applications • Are called by a running program to get services • Typically written in a high-level language (C or C++) • Machine dependent, but can be invoked by standard procedure libraries • Even a simple progr ...
Welcome to NETS3304/3604 Operating System Internals
... Hardware – provides basic computing resources CPU, memory, I/O devices Operating system Controls and coordinates use of hardware among various applications and users Application programs – define the ways in which the system resources are used to solve the computing problems of the users ...
... Hardware – provides basic computing resources CPU, memory, I/O devices Operating system Controls and coordinates use of hardware among various applications and users Application programs – define the ways in which the system resources are used to solve the computing problems of the users ...