Operating system organization
... resources (especially processor and memory) Every design issue MUST be evaluated wrt its contribution to functionality of system AND ...
... resources (especially processor and memory) Every design issue MUST be evaluated wrt its contribution to functionality of system AND ...
Operating-System Structure
... Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface (API) rather than direct system call use Three most common APIs are Win32 API for Windows, POSIX API for POSIX-based systems (including virtually all versions of UNI ...
... Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface (API) rather than direct system call use Three most common APIs are Win32 API for Windows, POSIX API for POSIX-based systems (including virtually all versions of UNI ...
Welcome to NETS3304/3604 Operating System Internals
... resources, we must be able to distinguish between the execution of operating system code and user defined code to ensure the proper execution of the OS. Dual-mode operation allows OS to protect itself and other ...
... resources, we must be able to distinguish between the execution of operating system code and user defined code to ensure the proper execution of the OS. Dual-mode operation allows OS to protect itself and other ...
Introduction to OS
... also the user programs. To manage the balance, OS gives control to processor and then depends on OS to execute instructions which give control back to OS. This way, processor keeps on executing interleaved sequence of user programs and OS programs. The OS decides how much CPU time should be awarded ...
... also the user programs. To manage the balance, OS gives control to processor and then depends on OS to execute instructions which give control back to OS. This way, processor keeps on executing interleaved sequence of user programs and OS programs. The OS decides how much CPU time should be awarded ...
PPT
... the “OS” Load into memory and execute By who? People = Operators How? By mechanical switches at first, then punch cards Just one application at a time so no need for protection and no need for sharing No virtual memory; either the entire program fit into memory or programmers handled moving sect ...
... the “OS” Load into memory and execute By who? People = Operators How? By mechanical switches at first, then punch cards Just one application at a time so no need for protection and no need for sharing No virtual memory; either the entire program fit into memory or programmers handled moving sect ...
CS111—Operating System Principles
... Unlike threads, context switching among processes also involves saving and restoring pointers to translation tables. To resume the process execution, the kernel reloads old register values, sets the CPU to user mode, and jumps to the old program counter. ...
... Unlike threads, context switching among processes also involves saving and restoring pointers to translation tables. To resume the process execution, the kernel reloads old register values, sets the CPU to user mode, and jumps to the old program counter. ...
dsk-01-intro
... action to ensure correct and consistent computing Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
... action to ensure correct and consistent computing Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
OS Services #1 File
... Certain systems allow system calls to be made directly from a higher level language program, in which case the calls normally resemble predefined function or subroutine calls. As an example of how system calls are used, consider writing a simple program to read data from one file and to copy them to ...
... Certain systems allow system calls to be made directly from a higher level language program, in which case the calls normally resemble predefined function or subroutine calls. As an example of how system calls are used, consider writing a simple program to read data from one file and to copy them to ...
Memory Management
... JCL: IBM's Job Control Language UNIX Shell Command File: List of commands are executed from a file Shell: Command interpreter processes each command (in file or at command prompt). Includes programming language constructs. Multiprogramming Reading in one program, executing another, sending out ...
... JCL: IBM's Job Control Language UNIX Shell Command File: List of commands are executed from a file Shell: Command interpreter processes each command (in file or at command prompt). Includes programming language constructs. Multiprogramming Reading in one program, executing another, sending out ...
oslecture2
... Device controller transfers blocks of data from buffer storage directly to main memory without CPU ...
... Device controller transfers blocks of data from buffer storage directly to main memory without CPU ...
interrupt - Universidade de Coimbra
... Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register ...
... Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register ...
CPS 210 Course Intro - Duke Computer Science
... • share data safely among concurrent activities? • protect one executing program’s storage from another? • protect the code that implements the protection, and mediates access to resources? • prevent rogue programs from taking over the machine? • allow programs to interact safely? ...
... • share data safely among concurrent activities? • protect one executing program’s storage from another? • protect the code that implements the protection, and mediates access to resources? • prevent rogue programs from taking over the machine? • allow programs to interact safely? ...
Introduction - USC Upstate: Faculty
... that is, a library such as the C library (libc), • provide an interface that allows applications to use a predefined series of APIs that define the functions for communicating with the kernel. • Examples of system calls: – performing file I/O (open, close, read, write) – running application programs ...
... that is, a library such as the C library (libc), • provide an interface that allows applications to use a predefined series of APIs that define the functions for communicating with the kernel. • Examples of system calls: – performing file I/O (open, close, read, write) – running application programs ...
Module 3: Operating
... Primary interface between user and OS. Usually a System Program. Not part of the kernel. Many commands are given to the operating system by control statements which deal with: process creation and management I/O handling secondary-storage management main-memory management file-system acce ...
... Primary interface between user and OS. Usually a System Program. Not part of the kernel. Many commands are given to the operating system by control statements which deal with: process creation and management I/O handling secondary-storage management main-memory management file-system acce ...
CS 519 Operating Systems Theory Spring 1998
... Use the mailing list/newsgroup/forum for discussions, do not be afraid to answer a question posted by your colleague even if you are not sure. This is a way to validate your understanding of the material. Do not forget, questions and discussions are not graded ! ...
... Use the mailing list/newsgroup/forum for discussions, do not be afraid to answer a question posted by your colleague even if you are not sure. This is a way to validate your understanding of the material. Do not forget, questions and discussions are not graded ! ...
Operating systems Architecture
... it attempts to restart it, otherwise selects another processor to provide the service ...
... it attempts to restart it, otherwise selects another processor to provide the service ...
Final Report
... The scheduling simulator illustrates the behavior of scheduling algorithms against a simulated mix of process loads. The user can specify the number of processes, the mean and standard deviation for compute time and I/O blocking time for each process, and the duration of the simulation. At the end o ...
... The scheduling simulator illustrates the behavior of scheduling algorithms against a simulated mix of process loads. The user can specify the number of processes, the mean and standard deviation for compute time and I/O blocking time for each process, and the duration of the simulation. At the end o ...
Document - Oman College of Management & Technology
... secondary storage to back up main memory. Most modern computer systems use hard( magnetic) disks as the principle on-line storage medium, for both programs and data. The operating system is responsible for the following activities in connection with disk management: Free space management ...
... secondary storage to back up main memory. Most modern computer systems use hard( magnetic) disks as the principle on-line storage medium, for both programs and data. The operating system is responsible for the following activities in connection with disk management: Free space management ...
CENG334 Introduction to Operating Systems
... Save programmers a lot of trouble when building applications Allow apps to be ported across a wide range of hardware platforms ...
... Save programmers a lot of trouble when building applications Allow apps to be ported across a wide range of hardware platforms ...
Operating Systems Operating System (OS) CS 217
... Figures out what caused the interrupt Executes a piece of code (interrupt handler) Re-loads execution context when done, and resumes execution ...
... Figures out what caused the interrupt Executes a piece of code (interrupt handler) Re-loads execution context when done, and resumes execution ...
CENG334 Introduction to Operating Systems
... Save programmers a lot of trouble when building applications Allow apps to be ported across a wide range of hardware platforms ...
... Save programmers a lot of trouble when building applications Allow apps to be ported across a wide range of hardware platforms ...
Module 3: Operating-System Structures
... processors that do not share memory or a clock. Each processor has its own local memory. • The processors in the system are connected through a communication network. • A distributed system provides user access to various system resources. • Access to a shared resource allows: – Computation speed-up ...
... processors that do not share memory or a clock. Each processor has its own local memory. • The processors in the system are connected through a communication network. • A distributed system provides user access to various system resources. • Access to a shared resource allows: – Computation speed-up ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.