Operating System Objectives and functions-D2
... Common Functions of Interrupts • Interrupt is an event external to the currently executing process that causes a change in the normal flow of instruction execution. • Possible solutions for checking Interrupts – Polling :CPU periodically checks each device to see if it needs service – Interrupt: In ...
... Common Functions of Interrupts • Interrupt is an event external to the currently executing process that causes a change in the normal flow of instruction execution. • Possible solutions for checking Interrupts – Polling :CPU periodically checks each device to see if it needs service – Interrupt: In ...
Module 1: Introduction What is an Operating System?
... • The CPU is multiplexed among several jobs that are kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). • A job is swapped in and out of memory to the disk. • On-line communication between the user and the system is provided; when the operating system finishes t ...
... • The CPU is multiplexed among several jobs that are kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). • A job is swapped in and out of memory to the disk. • On-line communication between the user and the system is provided; when the operating system finishes t ...
Chapter 10 – Operating Systems Roles of an Operating System
... – provides an interface through which a human can interact with the computer – allows an application program to interact with these other system resources ...
... – provides an interface through which a human can interact with the computer – allows an application program to interact with these other system resources ...
microcomputer operating systems
... required. Each syllabus should be created to adhere as closely as possible to these allocations. Of course, the topics cannot be followed sequentially. Many topics are taught best as an integrated whole, often revisiting the topic several times, each time at a higher level. There are normally 45 ...
... required. Each syllabus should be created to adhere as closely as possible to these allocations. Of course, the topics cannot be followed sequentially. Many topics are taught best as an integrated whole, often revisiting the topic several times, each time at a higher level. There are normally 45 ...
CISB222 - Department of Computer and Information Science
... memory hierarchy, multiprocessor and multicore organization, operating system objectives and functions, the evolution of operating systems, major achievements, developments leading to modern operating systems. Process Control and Processor Scheduling (2 hours): Concept of process, process states, pr ...
... memory hierarchy, multiprocessor and multicore organization, operating system objectives and functions, the evolution of operating systems, major achievements, developments leading to modern operating systems. Process Control and Processor Scheduling (2 hours): Concept of process, process states, pr ...
Lect03
... o A collection of tasks can be completed in less time with time-sharing than when completed sequentially ...
... o A collection of tasks can be completed in less time with time-sharing than when completed sequentially ...
ships with the operating system
... Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file Privilege escalation allows user to change to effective ID with ...
... Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file Privilege escalation allows user to change to effective ID with ...
Computers: Tools for an Information Age
... Examples of Network Operating Systems Windows NT Server Windows 2000 Server Novell Netware Unix Linux ...
... Examples of Network Operating Systems Windows NT Server Windows 2000 Server Novell Netware Unix Linux ...
Chapter 2: Operating-System Structures • Operating-System
... The O.S. hides the complexity of specific hardware devices from the user. ...
... The O.S. hides the complexity of specific hardware devices from the user. ...
Operating Systems Operating System Component and Structure
... – convenient: no need for rebooting for newly added modules – efficient: no need for messaging passing unlike microkernel – flexible: any module can call any other module unlike layered model ...
... – convenient: no need for rebooting for newly added modules – efficient: no need for messaging passing unlike microkernel – flexible: any module can call any other module unlike layered model ...
What is an Operating System?
... mode. The operating system is then loaded and starts user applications in user mode. Whenever a trap or interrupt occurs, the hardware switches from user mode to kernel mode (that is, changes the state of the mode bit to 0). Thus, whenever the operating system gains control of the computer, it is in ...
... mode. The operating system is then loaded and starts user applications in user mode. Whenever a trap or interrupt occurs, the hardware switches from user mode to kernel mode (that is, changes the state of the mode bit to 0). Thus, whenever the operating system gains control of the computer, it is in ...
Lecture slides
... • Caches improve the performance in two ways: Disk writes are clustered. instead of having many small transfers of data, few large transfers are possible. some data meant for write-out (from disk) may be directly accessed from the cache very fast. ...
... • Caches improve the performance in two ways: Disk writes are clustered. instead of having many small transfers of data, few large transfers are possible. some data meant for write-out (from disk) may be directly accessed from the cache very fast. ...
Operating Systems and Software
... Most PC’s come with Windows installed on them (if they’re not Mac’s!) A lot of people don’t like Windows. They think it’s ...
... Most PC’s come with Windows installed on them (if they’re not Mac’s!) A lot of people don’t like Windows. They think it’s ...
Chapter 2 Operating
... Now, however, they are most commonly written in higher-level languages such as C or C++. The first system that was not written in assembly language was probably the Master Control Program (MCP). MCP was written in a variant of ALGOL. The Linux and Windows XP operating systems are written mostly in C ...
... Now, however, they are most commonly written in higher-level languages such as C or C++. The first system that was not written in assembly language was probably the Master Control Program (MCP). MCP was written in a variant of ALGOL. The Linux and Windows XP operating systems are written mostly in C ...
Operating Systems - Bina – Advanced Software Services
... program should only depend on its input, not relying on common memory or order of running with others ...
... program should only depend on its input, not relying on common memory or order of running with others ...
OS Services System calls and their types
... 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 much and what ...
... 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 much and what ...
OS Components and Structure
... To understand an OS, let’s first look at its components and then how they’re composed or organized. We’ll come back and look at each of these in detail as the course progresses. Realize that it’s never as simple as it looks. These basic concepts exist in some form in all systems, however each system ...
... To understand an OS, let’s first look at its components and then how they’re composed or organized. We’ll come back and look at each of these in detail as the course progresses. Realize that it’s never as simple as it looks. These basic concepts exist in some form in all systems, however each system ...
What is an operating system?
... Process execution modes in Unix • User mode Processes can access their own instructions and data but not kernel instructions and data Cannot execute certain privileged machine instructions • Kernel mode Processes can access both kernel as well as user instructions and data No limit to which instruc ...
... Process execution modes in Unix • User mode Processes can access their own instructions and data but not kernel instructions and data Cannot execute certain privileged machine instructions • Kernel mode Processes can access both kernel as well as user instructions and data No limit to which instruc ...
ppt - Portland State University
... QNX is widely used in real commercial systems. Cisco's top-of-the-line router uses it, for example, and I can assure you, Cisco cares a **LOT** about performance. One of the leading operating systems in the military and aerospace markets, where reliability is absolutely critical is Green Hills' Inte ...
... QNX is widely used in real commercial systems. Cisco's top-of-the-line router uses it, for example, and I can assure you, Cisco cares a **LOT** about performance. One of the leading operating systems in the military and aerospace markets, where reliability is absolutely critical is Green Hills' Inte ...
chapter4
... – When the user turns on the computer and starts the operating system, a symbolic desktop is displayed. On this desktop are various objects, or icons. These graphical symbols represent files, disks, programs, and other objects. GUIs permit the user to manipulate these on-screen icons. Most people us ...
... – When the user turns on the computer and starts the operating system, a symbolic desktop is displayed. On this desktop are various objects, or icons. These graphical symbols represent files, disks, programs, and other objects. GUIs permit the user to manipulate these on-screen icons. Most people us ...
03-os-design
... UNIX was conventionally a monolithic design. Linux started as a monolithic kernel but with the increasing use of modules, the kernel can be made smaller and less monolithic ...
... UNIX was conventionally a monolithic design. Linux started as a monolithic kernel but with the increasing use of modules, the kernel can be made smaller and less monolithic ...
Operating Systems Review
... 5. In OLE, a copied object retains a link to its original file. 6. Windows 95/98 can not run old DOS programs. 7. DOS was designed to recognize only 640 KB of RAM. 8. A hard drive with 90% fragmentation will run better that one ...
... 5. In OLE, a copied object retains a link to its original file. 6. Windows 95/98 can not run old DOS programs. 7. DOS was designed to recognize only 640 KB of RAM. 8. A hard drive with 90% fragmentation will run better that one ...
Introduction - UW Courses Web Server
... This is a logical extension of multiprogramming. Each user has at least one separate program in memory. A program in execution is referred to as a process. Process switch occur so frequently that the users can interact with each program while it is running. File system allows users to access data an ...
... This is a logical extension of multiprogramming. Each user has at least one separate program in memory. A program in execution is referred to as a process. Process switch occur so frequently that the users can interact with each program while it is running. File system allows users to access data an ...