Test 1 Operating Systems and Networking CS
... answer. If processes within a system communicated via message passing without using shared memory, would we still insist on it? State your reason. Consider the following diagram that purports to depict a mouse that could be moved around and the monitor screen that displays it as a cursor motion. Wha ...
... answer. If processes within a system communicated via message passing without using shared memory, would we still insist on it? State your reason. Consider the following diagram that purports to depict a mouse that could be moved around and the monitor screen that displays it as a cursor motion. Wha ...
Design of OSes
... – A real problem: hard to distinguish responsible busy programs from selfish, stupid pigs. ...
... – A real problem: hard to distinguish responsible busy programs from selfish, stupid pigs. ...
Operating System: A Software Engineering Perspective
... Basic idea: users can supply modules, which run directly in the kernel’s address space Pros: Good performance Extensibility ...
... Basic idea: users can supply modules, which run directly in the kernel’s address space Pros: Good performance Extensibility ...
slides
... multiprogramming organizes jobs (code and data) so CPU always has one to execute subset of total jobs in system is kept in memory one job selected and run via job scheduling when it has to wait (for I/O for example), OS switches to another job ...
... multiprogramming organizes jobs (code and data) so CPU always has one to execute subset of total jobs in system is kept in memory one job selected and run via job scheduling when it has to wait (for I/O for example), OS switches to another job ...
Operating Systems
... It is a technique proposed by Lamport, used to order events in a distributed system without the use of clocks. This scheme is intended to order events consisting of the transmission of messages. Each system 'i' in the network maintains a counter Ci. Every time a system transmits a message, it increm ...
... It is a technique proposed by Lamport, used to order events in a distributed system without the use of clocks. This scheme is intended to order events consisting of the transmission of messages. Each system 'i' in the network maintains a counter Ci. Every time a system transmits a message, it increm ...
Operating System Concept
... ◦ User interaction with the computer system. ◦ A time-shared operating system uses CPU scheduling and multiprogramming to provide each user with a small portion of a time-shared ...
... ◦ User interaction with the computer system. ◦ A time-shared operating system uses CPU scheduling and multiprogramming to provide each user with a small portion of a time-shared ...
Lecture 2
... Other Services • 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 - CPU cycles, m ...
... Other Services • 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 - CPU cycles, m ...
Introduction to Object Technology
... a machine can host numerous applications, including those that run on different operating systems, on a single platform ...
... a machine can host numerous applications, including those that run on different operating systems, on a single platform ...
Operating System Services
... Resource allocation - When multiple users / jobs running concurrently, resources must be allocated to each of them Accounting - To keep track of which users use, how much, and what kinds of computer resources Protection and security n ...
... Resource allocation - When multiple users / jobs running concurrently, resources must be allocated to each of them Accounting - To keep track of which users use, how much, and what kinds of computer resources Protection and security n ...
PPT
... • There must be a system call instruction that: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, mode bit) so it can be restored – arch must permit os to verify caller’s parameters – must provide a way to r ...
... • There must be a system call instruction that: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, mode bit) so it can be restored – arch must permit os to verify caller’s parameters – must provide a way to r ...
OS imp structures
... – Easier to extend a microkernel – Easier to port OS to new architectures – More reliable (less code is running in kernel mode) ...
... – Easier to extend a microkernel – Easier to port OS to new architectures – More reliable (less code is running in kernel mode) ...
Part IV: Longer Answer: Use your knowledge of operating systems to
... never occur and can only be caused by another of the waiting processes. 6. _______________ is a situation where only one process may access a resource at a time. 7. _______________ is a UNIX system call that makes an exact copy of the current process; both processes then continue to execute independ ...
... never occur and can only be caused by another of the waiting processes. 6. _______________ is a situation where only one process may access a resource at a time. 7. _______________ is a UNIX system call that makes an exact copy of the current process; both processes then continue to execute independ ...
Introduction To Operating Systems
... • Asynchronous (interrupt-driven) After I/O starts, control returns to user program without waiting for I/O completion. Device controller later informs CPU that it has finished its operation by causing an interrupt. When an interrupt occur, current execution is put on hold; the CPU jumps to a servic ...
... • Asynchronous (interrupt-driven) After I/O starts, control returns to user program without waiting for I/O completion. Device controller later informs CPU that it has finished its operation by causing an interrupt. When an interrupt occur, current execution is put on hold; the CPU jumps to a servic ...
Operating Systems
... Utility software: programs for performing fundamental activities, but not included in operating systems. n ...
... Utility software: programs for performing fundamental activities, but not included in operating systems. n ...
Cont.
... • In multiprogramming, several programs are loaded in main memory • each program is assigned exclusive use of a portion of memory • This is called space-multiplexed sharing • “a resource (e.g., memory) is divided into two or more distinct units, and the individual parts are allocated to different pr ...
... • In multiprogramming, several programs are loaded in main memory • each program is assigned exclusive use of a portion of memory • This is called space-multiplexed sharing • “a resource (e.g., memory) is divided into two or more distinct units, and the individual parts are allocated to different pr ...
Structure of Operating Systems
... • Interrupts and traps • Protection, system calls and operating mode • OS structure • What happens when you boot a computer? ...
... • Interrupts and traps • Protection, system calls and operating mode • OS structure • What happens when you boot a computer? ...
chapter 4
... The Scheduler maintains this information as the process progresses. The process will shift back and forth between ready and waiting The priority of the process changes as time passes The scheduler must remove the process from the process table when ...
... The Scheduler maintains this information as the process progresses. The process will shift back and forth between ready and waiting The priority of the process changes as time passes The scheduler must remove the process from the process table when ...
application programs
... OS provides an environment where the user can conveniently run programs. The user does not have to worry about memory allocation or CPU scheduling. I/O Operations Each program requires input and produces output. The OS hides some of the details of the underlying hardware for such I/O. All the user ...
... OS provides an environment where the user can conveniently run programs. The user does not have to worry about memory allocation or CPU scheduling. I/O Operations Each program requires input and produces output. The OS hides some of the details of the underlying hardware for such I/O. All the user ...
An Introduction to Operating Systems
... OS provides an environment where the user can conveniently run programs. The user does not have to worry about memory allocation or CPU scheduling. ¾ I/O Operations Each program requires input and produces output. The OS hides some of the details of the underlying hardware for such I/O. All the user ...
... OS provides an environment where the user can conveniently run programs. The user does not have to worry about memory allocation or CPU scheduling. ¾ I/O Operations Each program requires input and produces output. The OS hides some of the details of the underlying hardware for such I/O. All the user ...
Chapter 1: Introduction
... the CPU from instructions, to physical addresses (which go in the memory address register (MAR) ). A contiguous logical address space can now map discontiguously to anywhere in physical memory and the mapping may even change throughout the life of the associated process. This process of address tran ...
... the CPU from instructions, to physical addresses (which go in the memory address register (MAR) ). A contiguous logical address space can now map discontiguously to anywhere in physical memory and the mapping may even change throughout the life of the associated process. This process of address tran ...
Self-Managing Techniques for Shared Server Resources
... Provide restricted access to the kernel ...
... Provide restricted access to the kernel ...
The Evolution of Operating Systems
... • The first thing performed by the computer when it is turned on (or re-booted) • The computer is designed so that it’s program counter will always point to one particular address in ROM. This is where a permanent program resides which gets the computer going. It directs the computer to load a progr ...
... • The first thing performed by the computer when it is turned on (or re-booted) • The computer is designed so that it’s program counter will always point to one particular address in ROM. This is where a permanent program resides which gets the computer going. It directs the computer to load a progr ...