Operating System Overview
... – Program should only depend on input to it, not on the activities of other programs ...
... – Program should only depend on input to it, not on the activities of other programs ...
Test1: Spring 2017 (Hint)
... ■ act on the interrupted process as required by the interrupt handler routine. If one or more interrupts are received while executing the last interrupt routine, ■ check its priority. If higher, execute this first depositing the last interrupt on a stack. Otherwise, put it in a FIFO queue to be exec ...
... ■ act on the interrupted process as required by the interrupt handler routine. If one or more interrupts are received while executing the last interrupt routine, ■ check its priority. If higher, execute this first depositing the last interrupt on a stack. Otherwise, put it in a FIFO queue to be exec ...
Virtual memory
... • Programs interact directly with hardware. • Two main problems: - Scheduling: installations used a sign-up sheet to reserve processor time. - Setup time: A single program, called a job, involve loading the compiler + the high-level language program. ...
... • Programs interact directly with hardware. • Two main problems: - Scheduling: installations used a sign-up sheet to reserve processor time. - Setup time: A single program, called a job, involve loading the compiler + the high-level language program. ...
Operating Systems CIS 250
... • Replicator - Windows can copy files from one workstation to another ...
... • Replicator - Windows can copy files from one workstation to another ...
General overview of the System
... • Operating system is a software that enables all the programs we use. • Examples – Windows, Linux, Unix, etc. ...
... • Operating system is a software that enables all the programs we use. • Examples – Windows, Linux, Unix, etc. ...
Summary: OS Concepts System Calls
... Summary: OS Concepts • Processes – Resources, Deadlocks – Pipes ...
... Summary: OS Concepts • Processes – Resources, Deadlocks – Pipes ...
Unit OS1: The Evolution of Operating Systems
... Management of multiple simultaneous users interconnected via terminals Fair resource management: CPU scheduling, spooling, mutual exclusion Real-Time Systems (process control systems) Management of time-critical processes High requirements with respect to reliability and availability ...
... Management of multiple simultaneous users interconnected via terminals Fair resource management: CPU scheduling, spooling, mutual exclusion Real-Time Systems (process control systems) Management of time-critical processes High requirements with respect to reliability and availability ...
CMPT 880: Internet Architectures and Protocols
... Traps (or exceptions) are software-generated interrupts due to • software errors, e.g., divide by zero, illegal memory access • Request for operating system services (system calls) ...
... Traps (or exceptions) are software-generated interrupts due to • software errors, e.g., divide by zero, illegal memory access • Request for operating system services (system calls) ...
slides - Simon Fraser University
... Traps (or exceptions) are software-generated interrupts due to • software errors, e.g., divide by zero, illegal memory access • Request for operating system services (system calls) ...
... Traps (or exceptions) are software-generated interrupts due to • software errors, e.g., divide by zero, illegal memory access • Request for operating system services (system calls) ...
Unit OS2: Operating Systems Principles
... Explain why Windows NT 4 move windows manager and graphics services from running in the context of the Windows Subsystem process to a set of callable services running in kernel mode. The primary reason for this shift was to improve overall system performance. Having a separate server process that co ...
... Explain why Windows NT 4 move windows manager and graphics services from running in the context of the Windows Subsystem process to a set of callable services running in kernel mode. The primary reason for this shift was to improve overall system performance. Having a separate server process that co ...
Lecture 1: Overview
... In the case of a shared or public system, the OS control access to the system as a whole and to specific system resources. ...
... In the case of a shared or public system, the OS control access to the system as a whole and to specific system resources. ...
Hold and wait
... Multiprocessor systems also known as parallel systems, tightlycoupled systems are growing in importance. Such systems have two or more processors in close communication. Multiprocessor system have three advantage. 1. Increased throughput – by increasing the number of processors, we expect to get mor ...
... Multiprocessor systems also known as parallel systems, tightlycoupled systems are growing in importance. Such systems have two or more processors in close communication. Multiprocessor system have three advantage. 1. Increased throughput – by increasing the number of processors, we expect to get mor ...
os_ch1-2008
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
Problems - Eastern Mediterranean University
... a) ………OS………… is a program that acts as an intermediary between a user of a computer and the computer hardware. b) CPU Scheduling choose among several jobs ready to run. The system must know their exact locations in memory. c) In computer systems generally we have two communication models. With these ...
... a) ………OS………… is a program that acts as an intermediary between a user of a computer and the computer hardware. b) CPU Scheduling choose among several jobs ready to run. The system must know their exact locations in memory. c) In computer systems generally we have two communication models. With these ...
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
... user no longer has direct access to processor job is submitted to computer operator who batches them together and places them on an input device program branches back to the monitor when finished ...
... user no longer has direct access to processor job is submitted to computer operator who batches them together and places them on an input device program branches back to the monitor when finished ...
Windows - Part I
... How windows executes code The Windows operating system uses two modes to maintain operating system efficiency and integrity: user mode and kernel mode. The architecture of 80386 and higher processors defines four privilege levels, called rings, to protect system code and data from being overwritte ...
... How windows executes code The Windows operating system uses two modes to maintain operating system efficiency and integrity: user mode and kernel mode. The architecture of 80386 and higher processors defines four privilege levels, called rings, to protect system code and data from being overwritte ...
Operating System Principle (DKT 221) Tutorial 1 1. Describe how
... a. How does the CPU interface with the device to coordinate the transfer? b. How does the CPU know when the memory operations are complete? c. The CPU is allowed to execute other programs while the DMA controller is transferring data. Does this process interfere with the execution of the user progra ...
... a. How does the CPU interface with the device to coordinate the transfer? b. How does the CPU know when the memory operations are complete? c. The CPU is allowed to execute other programs while the DMA controller is transferring data. Does this process interfere with the execution of the user progra ...
Operating systems Architecture
... functions that implement parts of the OS services or utilities can be used inside the kernel Manage and change internal structure. ...
... functions that implement parts of the OS services or utilities can be used inside the kernel Manage and change internal structure. ...
1-web
... Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: ...
... Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: ...
bt0070 - SMU Assignments
... Q1. What is an Operating System? Explain the functions of OS. Answer: Answer: Operating System is a System Software (Set of system programs) which provides an environment to help the user to execute the programs. An operating system (OS) is a software program that manages the hardware and software r ...
... Q1. What is an Operating System? Explain the functions of OS. Answer: Answer: Operating System is a System Software (Set of system programs) which provides an environment to help the user to execute the programs. An operating system (OS) is a software program that manages the hardware and software r ...
