Operating-System Structures
... • Program execution – OS capability to load a program into memory, run it, end execution, either normally or abnormally (indicating error). • I/O operations – since user programs cannot execute I/O operations directly, the OS must provide some means to perform I/O, which may involve a file or I/O de ...
... • Program execution – OS capability to load a program into memory, run it, end execution, either normally or abnormally (indicating error). • I/O operations – since user programs cannot execute I/O operations directly, the OS must provide some means to perform I/O, which may involve a file or I/O de ...
Addressing Modes
... Memory split into two One for Operating System (monitor) One for currently executing program ...
... Memory split into two One for Operating System (monitor) One for currently executing program ...
Chapter 9: Virtual Memory Silberschatz, Galvin and Gagne ©2013! Edition!
... 10. Correct the page table and other tables to show page is now in memory" 11. Wait for the CPU to be allocated to this process again" 12. Restore the user registers, process state, and new page table, and then resume the ...
... 10. Correct the page table and other tables to show page is now in memory" 11. Wait for the CPU to be allocated to this process again" 12. Restore the user registers, process state, and new page table, and then resume the ...
Computer Hardware
... CPU time, and I/O devices to programs Protects users and programs from each other and provides for inter-program communication Provides feedback to the system administrators to permit performance optimization of the computer system Chapter 13 Operating Systems: An Overview ...
... CPU time, and I/O devices to programs Protects users and programs from each other and provides for inter-program communication Provides feedback to the system administrators to permit performance optimization of the computer system Chapter 13 Operating Systems: An Overview ...
Introduction CS 239 Security for Networks and System
... work – So must allow read and write • But not too much to allow anyone to read and write anything there CS 236 Online ...
... work – So must allow read and write • But not too much to allow anyone to read and write anything there CS 236 Online ...
GC University Lahore
... operating systems are multitasking, multiprocessing and multi-user. All desktop Operating systems and most of server operating systems provide GUI features also. All or most OS are modularized, configurable and customizable. For this purpose, OS vendors also release development support for utilizing ...
... operating systems are multitasking, multiprocessing and multi-user. All desktop Operating systems and most of server operating systems provide GUI features also. All or most OS are modularized, configurable and customizable. For this purpose, OS vendors also release development support for utilizing ...
Chapter 6: Operating Systems: The Genie in the Computer
... Manage and Add to Capability • All operating systems are built to be extended. – By adding software to the operating system, new features can be added. • Operating system: Managing “housekeeping chores”: – A fragmented disk: As files become scattered on the hard disk, small chunks of space not large ...
... Manage and Add to Capability • All operating systems are built to be extended. – By adding software to the operating system, new features can be added. • Operating system: Managing “housekeeping chores”: – A fragmented disk: As files become scattered on the hard disk, small chunks of space not large ...
Lecture 1 - Operating System Overview
... Idea: Run more than one process at once; When one process blocks (waiting for disk, network, user input, etc.) run another process Problem: What can ill-behaved process do? Go into infinite loop and never relinquish CPU Scribble over other processes’ memory to make them fail ...
... Idea: Run more than one process at once; When one process blocks (waiting for disk, network, user input, etc.) run another process Problem: What can ill-behaved process do? Go into infinite loop and never relinquish CPU Scribble over other processes’ memory to make them fail ...
What is an Operating System?
... by an error (ex: Division by zero or invalid memory access) Or by a request from a user program for operating system service System call Other process problems include infinite loop, processes modifying each other or the operating system Dual-mode operation allows OS to protect itself and oth ...
... by an error (ex: Division by zero or invalid memory access) Or by a request from a user program for operating system service System call Other process problems include infinite loop, processes modifying each other or the operating system Dual-mode operation allows OS to protect itself and oth ...
What is an OS? • Interface between application programs and
... ∗ Improves performance by · Clustering disk writes; perform fewer large data transfers instead of many small transfers · Data destined for disk can be read back before it is written • Memory management – Memory management is one of the most important services provided by the operating system – An op ...
... ∗ Improves performance by · Clustering disk writes; perform fewer large data transfers instead of many small transfers · Data destined for disk can be read back before it is written • Memory management – Memory management is one of the most important services provided by the operating system – An op ...
Chapter 1: OS overview
... by an error (ex: Division by zero or invalid memory access) Or by a request from a user program for operating system service System call Other process problems include infinite loop, processes modifying each other or the operating system Dual-mode operation allows OS to protect itself and oth ...
... by an error (ex: Division by zero or invalid memory access) Or by a request from a user program for operating system service System call Other process problems include infinite loop, processes modifying each other or the operating system Dual-mode operation allows OS to protect itself and oth ...
Chapter 3 Memory Management: Virtual Memory
... • To load a working set into memory the system must decide – The maximum number of pages the operating system will allow for a working set – If this is the first time its run how can it know the working set? • Maybe this could be observed as the program is first loaded into memory and then this info ...
... • To load a working set into memory the system must decide – The maximum number of pages the operating system will allow for a working set – If this is the first time its run how can it know the working set? • Maybe this could be observed as the program is first loaded into memory and then this info ...
Operating Systems
... – e.g. DOS, Windows, Win 95/98, . . . • RT Systems: power is nothing without control. – hard-real time: nuclear reactor safety monitor. – soft-real time: mp3 player. • Parallel Processing: the need for speed. – SMP: 2–8 processors in a box. ...
... – e.g. DOS, Windows, Win 95/98, . . . • RT Systems: power is nothing without control. – hard-real time: nuclear reactor safety monitor. – soft-real time: mp3 player. • Parallel Processing: the need for speed. – SMP: 2–8 processors in a box. ...
Linux+ Guide to Linux Certification
... • MS-DOS Version 1.0 gave all available memory to resident application program • MS-DOS Version 2.0 began supporting dynamic allocation, modification, and release of main memory blocks by application programs • Amount of memory each application program actually owns depends on: – Type of file from w ...
... • MS-DOS Version 1.0 gave all available memory to resident application program • MS-DOS Version 2.0 began supporting dynamic allocation, modification, and release of main memory blocks by application programs • Amount of memory each application program actually owns depends on: – Type of file from w ...
Operating Systems II
... Hardware Support for Operating Systems Recall that OS should securely multiplex resources. ⇒ we need to ensure that an application cannot: • compromise the operating system. • compromise other applications. • deny others service (e.g. abuse resources) To achieve this efficiently and flexibly, we ne ...
... Hardware Support for Operating Systems Recall that OS should securely multiplex resources. ⇒ we need to ensure that an application cannot: • compromise the operating system. • compromise other applications. • deny others service (e.g. abuse resources) To achieve this efficiently and flexibly, we ne ...
1.1 What is an Operating System?
... tasks. Since there may be, possibly conflicting, requests for resources, the operating system must decide which requests are allocated resources to operate the computer system efficiently and fairly. Another different view of an operating system is as the extended machine. The function of operating ...
... tasks. Since there may be, possibly conflicting, requests for resources, the operating system must decide which requests are allocated resources to operate the computer system efficiently and fairly. Another different view of an operating system is as the extended machine. The function of operating ...
03-60-330-01 Winter 2010 - School of Computer Science
... A) processes spend long times waiting to execute B) there will never be more than one running process C) input-output always causes CPU slowdown D) process scheduling is always optimal ...
... A) processes spend long times waiting to execute B) there will never be more than one running process C) input-output always causes CPU slowdown D) process scheduling is always optimal ...
3.1 What are the five major activities of an operating system in
... 3.9 The main advantage of the layered approach to operating systems design is that debugging and testing are simplified. The layers are designed so that each uses only lower-level services. The interface between the layers is well defined, and encapsulates the implementation details of each level fr ...
... 3.9 The main advantage of the layered approach to operating systems design is that debugging and testing are simplified. The layers are designed so that each uses only lower-level services. The interface between the layers is well defined, and encapsulates the implementation details of each level fr ...
Test Bank Chapter Three (Operating Systems)
... questions (depending on the topics covered in your course) in which the students are ask to match phrases and terms. An example would be a question of the form, “In the blank next to each phrase, write the term from the following list that is best described by the phrase.” ...
... questions (depending on the topics covered in your course) in which the students are ask to match phrases and terms. An example would be a question of the form, “In the blank next to each phrase, write the term from the following list that is best described by the phrase.” ...
Four Components of a Computer System
... so frequently that users can interact with each job while it is running, creating interactive computing" ...
... so frequently that users can interact with each job while it is running, creating interactive computing" ...
Operating System Concepts for System Programmers
... is called booting process. Following are the various steps involved while booting the OS: The BIOS program present in the non-volatile (ROM/Flash) memory of a computer will run first. In fact whenever a CPU is powered on, it tries to fetch (read) instructions from a fixed start address. The computer ...
... is called booting process. Following are the various steps involved while booting the OS: The BIOS program present in the non-volatile (ROM/Flash) memory of a computer will run first. In fact whenever a CPU is powered on, it tries to fetch (read) instructions from a fixed start address. The computer ...
MIDTERM #1 - School of Computer Science
... 2. An operating system may be viewed as a resource allocator of such things as CPU time, memory space, file-storage space, I/O devices, and so on, due to the requirement that _________ . A) such things need to allocated to be useful for operating systems to work B) conflicts of resource usage must n ...
... 2. An operating system may be viewed as a resource allocator of such things as CPU time, memory space, file-storage space, I/O devices, and so on, due to the requirement that _________ . A) such things need to allocated to be useful for operating systems to work B) conflicts of resource usage must n ...
Operating Systems: Why Object-Oriented?
... task by abstracting away issues that (we hoped) they didn’t need to deal with. We have, over the years, developed a number of elegant OS abstractions, and we don’t want to forfeit them or the skills that created them. What we would like is for our systems to become cleaner, not less so. We argue tha ...
... task by abstracting away issues that (we hoped) they didn’t need to deal with. We have, over the years, developed a number of elegant OS abstractions, and we don’t want to forfeit them or the skills that created them. What we would like is for our systems to become cleaner, not less so. We argue tha ...
Chapter 1
... 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 (e.g., a lawyer doesn’t work on one case at a time) ...
... 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 (e.g., a lawyer doesn’t work on one case at a time) ...
Lecture 1
... memory space. It is called a page table. It is loaded as part of the context switching – malloc() and free() to allocate and free logical memory. ...
... memory space. It is called a page table. It is loaded as part of the context switching – malloc() and free() to allocate and free logical memory. ...