L03 - UMBC
... Allows you to communicate with the computer (tell it what to do) Controls access (login) to the computer Keeps track of all processes currently running ...
... Allows you to communicate with the computer (tell it what to do) Controls access (login) to the computer Keeps track of all processes currently running ...
yanc: Yet Another Network Controller References
... by standard file I/O, and we do not need special applications which sit at some privileged point between the network OS and hardware. Program dependencies and ordering is configured through text files – e.g., a program can be packaged with a config file in /usr/share/yanc/conf.d/ with a default prio ...
... by standard file I/O, and we do not need special applications which sit at some privileged point between the network OS and hardware. Program dependencies and ordering is configured through text files – e.g., a program can be packaged with a config file in /usr/share/yanc/conf.d/ with a default prio ...
Basic Unix - University of Arizona
... lists the files in a directory one screenful at a time How this works: • ls writes its output to its stdout • more’s input stream defaults to its stdin • the pipe connects ls’s stdout to more’s stdin • the piped commands run “in parallel” ...
... lists the files in a directory one screenful at a time How this works: • ls writes its output to its stdout • more’s input stream defaults to its stdin • the pipe connects ls’s stdout to more’s stdin • the piped commands run “in parallel” ...
Operating Systems
... SystemArchitecture, OS Structure, OS Operations, Evolution of Operating Systems - Simple Batch, Multi programmed, time shared, Personal Computer, Parallel, Distributed Systems, Real-Time Systems, Special - Purpose Systems, Operating System services, user OS Interface, System Calls, Types of System C ...
... SystemArchitecture, OS Structure, OS Operations, Evolution of Operating Systems - Simple Batch, Multi programmed, time shared, Personal Computer, Parallel, Distributed Systems, Real-Time Systems, Special - Purpose Systems, Operating System services, user OS Interface, System Calls, Types of System C ...
Slide 1
... know much about the hardware • The OS provides all applications with a straight-forward and consistent interface to hardware Example: An application uses the OS to store data on the disk drive without knowing exact physical characteristics of the disk. ...
... know much about the hardware • The OS provides all applications with a straight-forward and consistent interface to hardware Example: An application uses the OS to store data on the disk drive without knowing exact physical characteristics of the disk. ...
Word Processors
... communicate with all hardware devices attached to the computer, A device driver are instructions for the OS on how to communicate with each device, In order for a piece of hardware to work properly its own driver needs installing – it also must be the correct version for the operating system you are ...
... communicate with all hardware devices attached to the computer, A device driver are instructions for the OS on how to communicate with each device, In order for a piece of hardware to work properly its own driver needs installing – it also must be the correct version for the operating system you are ...
Core System Services
... • A runlevel is a preset operating state on a Unix-like operating system. • A system can be booted into any of several runlevels, each of which is represented by a single digit integer. Each runlevel designates a different system configuration and allows access to a different combination of processe ...
... • A runlevel is a preset operating state on a Unix-like operating system. • A system can be booted into any of several runlevels, each of which is represented by a single digit integer. Each runlevel designates a different system configuration and allows access to a different combination of processe ...
Chapter 3 PowerPoint
... applications/software/programs. • Multitasking – the ability to run multiple programs simultaneously. The CPU switches between all the programs quickly to make it appear they are all running simultaneously. • Multiprocessing – When a computer has multiple CPU’s or multicore CPU’s and each works on a ...
... applications/software/programs. • Multitasking – the ability to run multiple programs simultaneously. The CPU switches between all the programs quickly to make it appear they are all running simultaneously. • Multiprocessing – When a computer has multiple CPU’s or multicore CPU’s and each works on a ...
Chapter 8: Operating Systems and Utility Programs
... – The operating system assigned a portion of storage medium, i.e. a hard disk, to function as additional RAM – Slower than RAM – Swap file • The part of the hard disk used for virtual memory • Paging is the technique of swapping items between memory and storage – It’s a time consuming process ...
... – The operating system assigned a portion of storage medium, i.e. a hard disk, to function as additional RAM – Slower than RAM – Swap file • The part of the hard disk used for virtual memory • Paging is the technique of swapping items between memory and storage – It’s a time consuming process ...
The Evolution of the Unix Time
... Canaday, and Ritchie developed, on blackboards and scribbled notes, the basic design of a file system that was later to become the heart of Unix. Most of the design was Thompson’s, as was the impulse to think about file systems at all, but I believe I contributed the idea of device files. Thompson’s ...
... Canaday, and Ritchie developed, on blackboards and scribbled notes, the basic design of a file system that was later to become the heart of Unix. Most of the design was Thompson’s, as was the impulse to think about file systems at all, but I believe I contributed the idea of device files. Thompson’s ...
Presentation: Operating systems
... IT concepts: popular operating systems, opensource vs proprietary software, operating system functions, device drivers, TCP/IP, virtualization ...
... IT concepts: popular operating systems, opensource vs proprietary software, operating system functions, device drivers, TCP/IP, virtualization ...
CS 381 Operating Systems
... An operating system is an intermediary between the user programs and the computer hardware resources. By managing disparate hardware resources, an OS shields user programs from the complexities of individual hardware devices and issues such as concurrency and failure. The user gets an abstraction of ...
... An operating system is an intermediary between the user programs and the computer hardware resources. By managing disparate hardware resources, an OS shields user programs from the complexities of individual hardware devices and issues such as concurrency and failure. The user gets an abstraction of ...
The Evolution of the Unix Time-sharing System
... H. Canaday, and Ritchie developed, on blackboards and scribbled notes, the basic design of a file system that was later to become the heart of Unix. Most of the design was Thompson’s, as was the impulse to think about file systems at all, but I believe I contributed the idea of device files. Thompso ...
... H. Canaday, and Ritchie developed, on blackboards and scribbled notes, the basic design of a file system that was later to become the heart of Unix. Most of the design was Thompson’s, as was the impulse to think about file systems at all, but I believe I contributed the idea of device files. Thompso ...
Linux Introduction - Personal Web Pages
... ideas to the Linux kernel – At the time, the GNU Project had created many of the components required for a free software operating system, but its own kernel, GNU Hurd, was incomplete and unavailable – BSD operating system had not yet freed itself from ...
... ideas to the Linux kernel – At the time, the GNU Project had created many of the components required for a free software operating system, but its own kernel, GNU Hurd, was incomplete and unavailable – BSD operating system had not yet freed itself from ...
MINIX 3: status report and current research
... the term “microkernel” gets a lot of attention—and microkernels are widely used in cell phones, avionics, automotive, and other embedded systems where reliability is crucial [2]—it is the multiserver aspect of the system that concerns us here. The microkernel runs in kernel mode, but nearly all the ...
... the term “microkernel” gets a lot of attention—and microkernels are widely used in cell phones, avionics, automotive, and other embedded systems where reliability is crucial [2]—it is the multiserver aspect of the system that concerns us here. The microkernel runs in kernel mode, but nearly all the ...
Course Title: Operating System
... analyze the tradeoffs inherent in operating system design. differentiate between the concepts of processes, threads and multithreading. demonstrate practical experience of mechanisms for handling situations of deadlock among processes. categorize different ways of implementing virtual memory. discus ...
... analyze the tradeoffs inherent in operating system design. differentiate between the concepts of processes, threads and multithreading. demonstrate practical experience of mechanisms for handling situations of deadlock among processes. categorize different ways of implementing virtual memory. discus ...
Powerpoint source
... • Support parallel applications wishing to get speedup of computationally complex tasks • Needs basic primitives for dividing one task into multiple parallel activities • Supports efficient communication between those activities • Supports synchronization of activities to coordinate sharing of infor ...
... • Support parallel applications wishing to get speedup of computationally complex tasks • Needs basic primitives for dividing one task into multiple parallel activities • Supports efficient communication between those activities • Supports synchronization of activities to coordinate sharing of infor ...
Chapter 8 Operating Systems and Utility Programs
... • A program or file suddenly is missing • An unknown program or file mysteriously appears • The size of a file changes without explanation • A file becomes corrupted • A program or file does not work properly • System properties change ...
... • A program or file suddenly is missing • An unknown program or file mysteriously appears • The size of a file changes without explanation • A file becomes corrupted • A program or file does not work properly • System properties change ...
OS Services System calls and their types
... 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 • Many types of resources - Some (such as CPU cycles, main ...
... 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 • Many types of resources - Some (such as CPU cycles, main ...
virtual machine
... and batch users. Many commands are given to the operating system by control statements which deal with: Process creation and management, Main-memory management, file-system access, I/O handling, secondary-storage management, Networking, Protection. ...
... and batch users. Many commands are given to the operating system by control statements which deal with: Process creation and management, Main-memory management, file-system access, I/O handling, secondary-storage management, Networking, Protection. ...
Operating Systems - KSU Web Home
... The massive storage devices, which store large amounts of data and programs in permanent form The I/O devices or input/output units The system bus, which provides interconnections for all components of the system ...
... The massive storage devices, which store large amounts of data and programs in permanent form The I/O devices or input/output units The system bus, which provides interconnections for all components of the system ...
FILE
... Third subject of this lecture is Linux kernel internal. This part begins from the kernel overall architecture, several important concepts exported by kernel such as file descriptor, superblock, inode, buffer cache, fsck etc. We will first read UNIX source code then introduce Linux source code. ...
... Third subject of this lecture is Linux kernel internal. This part begins from the kernel overall architecture, several important concepts exported by kernel such as file descriptor, superblock, inode, buffer cache, fsck etc. We will first read UNIX source code then introduce Linux source code. ...
Plan 9 from Bell Labs
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Plan 9 from Bell Labs is a distributed operating system, originally developed by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. It takes some of the principles of Unix, developed in the same research group, but extends these to a networked environment with graphics terminals.In Plan 9, virtually all computing resources, including files, network connections, and peripheral devices, are represented through the file system rather than specialized interfaces. A unified network protocol called 9P ties a network of computers running Plan 9 together, allowing them to share all resources so represented.The name Plan 9 from Bell Labs is a reference to the Ed Wood 1959 cult science fiction Z-movie Plan 9 from Outer Space. Also, Glenda, the Plan 9 Bunny, is presumably a reference to Wood's film Glen or Glenda. The system continues to be used and developed by operating system researchers and hobbyists.