Chapter 3: Threads, SMP and Microkernels
... interference are caused. The CPU can initiate a DMA operation by writing values into special registers that can be independently accessed by the device. The device initiates the corresponding operation once it receives a command from the CPU. When the device is finished with its operation, it interr ...
... interference are caused. The CPU can initiate a DMA operation by writing values into special registers that can be independently accessed by the device. The device initiates the corresponding operation once it receives a command from the CPU. When the device is finished with its operation, it interr ...
KernelSec: An Authorization Model in the Operating System Kernel
... the lifetime of a process. KernelSec implements active transitions to support this. KernelSec also implements a sophisticated group mechanism that among other things can represent relationship among groups. ...
... the lifetime of a process. KernelSec implements active transitions to support this. KernelSec also implements a sophisticated group mechanism that among other things can represent relationship among groups. ...
Operating Systems
... The OS was simple, its major task was to transfer control from one job to the next. The job was submitted to the computer operator in form of punch cards. At some later time the output appeared. The OS was always resident in memory. (Ref. Fig. next ...
... The OS was simple, its major task was to transfer control from one job to the next. The job was submitted to the computer operator in form of punch cards. At some later time the output appeared. The OS was always resident in memory. (Ref. Fig. next ...
Petascale Plan 9 on Blue Gene Research Summary Ron Minnich Eric Van Hensbergen
... In Plan 9, user-mode and kernel-mode components can be substituted for each other at will, and components can be remote or local, transparent to the application. Some services are built into the kernel as drivers, and some are provided by servers outside the kernel. Applications, however, access th ...
... In Plan 9, user-mode and kernel-mode components can be substituted for each other at will, and components can be remote or local, transparent to the application. Some services are built into the kernel as drivers, and some are provided by servers outside the kernel. Applications, however, access th ...
Chapter 1: Operating System Concepts
... disk, so that when the currently executing processes are finished, there will be work waiting for the CPU. Output spooling consists of first copying printable files to disk before printing them, rather than printing directly as the output is generated. Input spooling on a personal computer is not ve ...
... disk, so that when the currently executing processes are finished, there will be work waiting for the CPU. Output spooling consists of first copying printable files to disk before printing them, rather than printing directly as the output is generated. Input spooling on a personal computer is not ve ...
5. What is an Operating System? Explain its components Answer An
... OS contains interrupt service routines (interrupt handlers), typically one for each possible type of interrupt from the hardware.Example: clock handler: handles the clock device, which ticks 60 (or more) times per second OSalso contains trap service routines (trap handlers), typically one for each p ...
... OS contains interrupt service routines (interrupt handlers), typically one for each possible type of interrupt from the hardware.Example: clock handler: handles the clock device, which ticks 60 (or more) times per second OSalso contains trap service routines (trap handlers), typically one for each p ...
quiz1-s3
... Turn off interrupts. d) Access I/O device. 2. Which of the following would lead you to believe that a given system is an SMP-type system? a) Each processor is assigned a specific task. b) There is a boss–worker relationship between the processors. c) Each processor performs all tasks within the oper ...
... Turn off interrupts. d) Access I/O device. 2. Which of the following would lead you to believe that a given system is an SMP-type system? a) Each processor is assigned a specific task. b) There is a boss–worker relationship between the processors. c) Each processor performs all tasks within the oper ...
OPERATING-SYSTEM
... May be applied to both Single and multi-user operating Systems. REAL-TIME Os are characterised by FOUR requirements -they have to support application programs which are nonosequential in nature,i.e. they are continuous process and do not have a START-PROCESS-END Structure -They have to carry out pro ...
... May be applied to both Single and multi-user operating Systems. REAL-TIME Os are characterised by FOUR requirements -they have to support application programs which are nonosequential in nature,i.e. they are continuous process and do not have a START-PROCESS-END Structure -They have to carry out pro ...
Operating Systems
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
Introduction to operating systems
... A consistent interface between the user and the operating system. ...
... A consistent interface between the user and the operating system. ...
Operating Systems
... A convenient interface for users Networking services Messaging and synchronization services between processes Utility “system software” such as editors, loaders, help, etc. ...
... A convenient interface for users Networking services Messaging and synchronization services between processes Utility “system software” such as editors, loaders, help, etc. ...
Operating system
... buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spooling (the overlapping of output of one job with input of other jobs) – General device-driver interface – Drivers for specific hardware devices ...
... buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spooling (the overlapping of output of one job with input of other jobs) – General device-driver interface – Drivers for specific hardware devices ...
Operating Systems - inst.eecs.berkeley.edu
... application development: “all the code you didn’t write” in order to implement your application • Because hardware changes faster than applications! • Because some concepts are useful across applications ...
... application development: “all the code you didn’t write” in order to implement your application • Because hardware changes faster than applications! • Because some concepts are useful across applications ...
Chapter 1 Computer System Overview
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
operating system
... programs (location in memory, stack pointer, program counter). When a program is run, the operating system converts it into a process. It is the process, rather than the simple program, that the processor executes. ...
... programs (location in memory, stack pointer, program counter). When a program is run, the operating system converts it into a process. It is the process, rather than the simple program, that the processor executes. ...
Distributed operating system
A distributed operating system is a software over a collection of independent, networked, communicating, and physically separate computational nodes. Each individual node holds a specific software subset of the global aggregate operating system. Each subset is a composite of two distinct service provisioners. The first is a ubiquitous minimal kernel, or microkernel, that directly controls that node’s hardware. Second is a higher-level collection of system management components that coordinate the node's individual and collaborative activities. These components abstract microkernel functions and support user applications.The microkernel and the management components collection work together. They support the system’s goal of integrating multiple resources and processing functionality into an efficient and stable system. This seamless integration of individual nodes into a global system is referred to as transparency, or single system image; describing the illusion provided to users of the global system’s appearance as a single computational entity.