Comparison of Amoeba Vs Mach Operating Systems
... Simplified kernel structure with a small number of abstractions: In turn these abstractions are sufficiently general to allow other operating systems to be implemented on top of Mach Network transparency: Distributed operation, providing network transparency to clients and an object-oriented organiz ...
... Simplified kernel structure with a small number of abstractions: In turn these abstractions are sufficiently general to allow other operating systems to be implemented on top of Mach Network transparency: Distributed operation, providing network transparency to clients and an object-oriented organiz ...
Chapter10
... • Process management keeping track of processes and the states they are in • CPU scheduling determines which process in memory is executed by the CPU at any given instant in time ...
... • Process management keeping track of processes and the states they are in • CPU scheduling determines which process in memory is executed by the CPU at any given instant in time ...
read queue
... – I/O must be performed via system calls • Memory-mapped and I/O port memory locations must be protected too ...
... – I/O must be performed via system calls • Memory-mapped and I/O port memory locations must be protected too ...
eFS: encrypted File system
... Ensure that private data is not accessed by other users ( may not be malicious). ...
... Ensure that private data is not accessed by other users ( may not be malicious). ...
Real-Time Operating Systems Hard and Soft Real
... – To control activities in an external system, or to participate in them ...
... – To control activities in an external system, or to participate in them ...
An operating system - Bilkent University Computer Engineering
... • Disk store data that does not fit into memory and to be stored for long time; Proper management is of central importance • Entire speed of computer operation may depend on the disk subsystem and its algorithms ...
... • Disk store data that does not fit into memory and to be stored for long time; Proper management is of central importance • Entire speed of computer operation may depend on the disk subsystem and its algorithms ...
Literatur Computer Systeme und Anwendungen Informatics 3
... Computer) to enable a more flexible use of a computer memory addresses can be translated by a special electronic device in a computer (MMU) before accessing the memory to real memory addresses. This enables a more flexible use of the memory. Parts of the memory which were not used for some time can ...
... Computer) to enable a more flexible use of a computer memory addresses can be translated by a special electronic device in a computer (MMU) before accessing the memory to real memory addresses. This enables a more flexible use of the memory. Parts of the memory which were not used for some time can ...
Chapter 3 PowerPoint
... During the boot process, the essential portion, or core, of the operating system (called the kernel) is loaded into memory. Running Programs/Applications The most important function for an operating system is to run our applications/software/programs. • Multitasking – the ability to run multiple pro ...
... During the boot process, the essential portion, or core, of the operating system (called the kernel) is loaded into memory. Running Programs/Applications The most important function for an operating system is to run our applications/software/programs. • Multitasking – the ability to run multiple pro ...
COS 318: Operating Systems OS Structures and System Calls Prof. Margaret Martonosi
... Level N constructed on N-1 Hiding information at each layer Examples: ...
... Level N constructed on N-1 Hiding information at each layer Examples: ...
File
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
08_Operating System Support
... Memory Management • Uni-program —Memory split into two —One for Operating System —One for currently executing program ...
... Memory Management • Uni-program —Memory split into two —One for Operating System —One for currently executing program ...
Introduction to Operating Systems
... I/O Operations - since users cannot execute I/O operations directly File System Manipulation - read, write, create, delete files Communications - interprocess and intersystem Error Detection - in hardware, I/O devices, user programs ...
... I/O Operations - since users cannot execute I/O operations directly File System Manipulation - read, write, create, delete files Communications - interprocess and intersystem Error Detection - in hardware, I/O devices, user programs ...
CS_Course_Syllabus_Template
... Improve student's skills in thinking based on discussions and problem solving. Learn and summarize the main features, functionalities, and services of OS. Describe the mechanism of using interrupts, dispatching, context switching and describe the difference between processes and threads. Differentia ...
... Improve student's skills in thinking based on discussions and problem solving. Learn and summarize the main features, functionalities, and services of OS. Describe the mechanism of using interrupts, dispatching, context switching and describe the difference between processes and threads. Differentia ...
operating system
... After studying this chapter, the student should be able to: Understand the role of the operating system. Understand the process of bootstrapping to load the operating system into memory. List the components of an operating system. Discuss the role of the memory manager. Discuss the role of ...
... After studying this chapter, the student should be able to: Understand the role of the operating system. Understand the process of bootstrapping to load the operating system into memory. List the components of an operating system. Discuss the role of the memory manager. Discuss the role of ...
UNIX Operating System Names
... personal computers and servers, usually in the form of Linux distributions, and on various embedded devices such as routers, wireless access points, PBXes, set-top boxes, FTA receivers, smart TVs, PVRs and NAS appliances. The Android operating system for tablet computers, smartphones and smartwatche ...
... personal computers and servers, usually in the form of Linux distributions, and on various embedded devices such as routers, wireless access points, PBXes, set-top boxes, FTA receivers, smart TVs, PVRs and NAS appliances. The Android operating system for tablet computers, smartphones and smartwatche ...
Introduction to OS - EECG Toronto
... Allows programs to share CPU, memory Isolates applications from each other – What problems occur otherwise? Isolates itself from applications – What problems occur otherwise? ...
... Allows programs to share CPU, memory Isolates applications from each other – What problems occur otherwise? Isolates itself from applications – What problems occur otherwise? ...
13. IO Systems
... Device reservation - provides exclusive access to a device u System calls for allocation and deallocation u Watch out for deadlock Operating Systems ...
... Device reservation - provides exclusive access to a device u System calls for allocation and deallocation u Watch out for deadlock Operating Systems ...
Ceng 334 - Operating Systems
... map to speed up the process (one pass instead of two) for large memories • When page daemon runs, it first clears the R bit at the front hand, and then checks the R bit at the back hand, after which it advances both hands • Each time the page daemon runs, the hands rotate less than a full revolution ...
... map to speed up the process (one pass instead of two) for large memories • When page daemon runs, it first clears the R bit at the front hand, and then checks the R bit at the back hand, after which it advances both hands • Each time the page daemon runs, the hands rotate less than a full revolution ...
Operating Systems
... that the CPU is ‘shared nicely’ by the processes? CPU scheduling is the act of determining which process in the ready state should be moved to the running state Non preemptive scheduling: Decisions made by the CPU when the current process in the running state gives up the CPU ...
... that the CPU is ‘shared nicely’ by the processes? CPU scheduling is the act of determining which process in the ready state should be moved to the running state Non preemptive scheduling: Decisions made by the CPU when the current process in the running state gives up the CPU ...
The Evolution of the Unix Time
... both made only when the disk was recreated. Installation of a new device was very painful, because the code for devices was spread widely throughout the system; for example there were several loops that visited each device in turn. Not surprisingly, there was no notion of mounting a removable disk p ...
... both made only when the disk was recreated. Installation of a new device was very painful, because the code for devices was spread widely throughout the system; for example there were several loops that visited each device in turn. Not surprisingly, there was no notion of mounting a removable disk p ...
The Evolution of the Unix Time-sharing System
... the Labs to spend too much money on too few people with too vague a plan. Moreover, I am quite sure that at that time operating systems were not, for our management, an attractive area in which to support work. They were in the process of extricating themselves not only from an operating system deve ...
... the Labs to spend too much money on too few people with too vague a plan. Moreover, I am quite sure that at that time operating systems were not, for our management, an attractive area in which to support work. They were in the process of extricating themselves not only from an operating system deve ...
CSCI1412 - Introduction & Overview
... • If a swapped-out page is required again another page is copied out and the needed one copied in – sometimes the OS can spend so much time swapping pages that little or no useful processing is done • this is called disk thrashing © De Montfort University, 2004 ...
... • If a swapped-out page is required again another page is copied out and the needed one copied in – sometimes the OS can spend so much time swapping pages that little or no useful processing is done • this is called disk thrashing © De Montfort University, 2004 ...
interrupt
... When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extension in 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 ...
... When it has to wait (for I/O for example), OS switches to another job Timesharing (multitasking) is logical extension in 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 ...