Chorus and other Microkernels
... contiguous regions that map a portion of a segment into physical memory. – System actors called “Mappers” manage segments, allocating regions as needed. ...
... contiguous regions that map a portion of a segment into physical memory. – System actors called “Mappers” manage segments, allocating regions as needed. ...
slides - network systems lab @ sfu
... System Calls How can we access OS services? System calls A programming interface to OS services Typically written in high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface (API), rather than direct system call ...
... System Calls How can we access OS services? System calls A programming interface to OS services Typically written in high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface (API), rather than direct system call ...
Homework: OS Organization
... Submit: In lab 4 you completed building the core of an exokernel-based operating system. In class you studied xv6, a monolithic operating systems. Both are intend to support the UNIX API, but their internal organizations are different. A good example is the virtual memory implementation: JOS impleme ...
... Submit: In lab 4 you completed building the core of an exokernel-based operating system. In class you studied xv6, a monolithic operating systems. Both are intend to support the UNIX API, but their internal organizations are different. A good example is the virtual memory implementation: JOS impleme ...
Page table
... Some implement user-level operating systems Some implement services crucial to all userlevel operating systems ...
... Some implement user-level operating systems Some implement services crucial to all userlevel operating systems ...
COS 318: Operating Systems Overview Kai Li Computer Science Department
... Browser, shell, powerpoint, word, … ...
... Browser, shell, powerpoint, word, … ...
Introduction
... to use a predefined series of APIs that define the functions for communicating with the kernel. – Examples of system calls include those for performing file I/O (open, close, read, write) and running application programs (exec). ...
... to use a predefined series of APIs that define the functions for communicating with the kernel. – Examples of system calls include those for performing file I/O (open, close, read, write) and running application programs (exec). ...
Functions of the operating systems
... Input and output: allows computer to display and get data from the I/O devices to interact with users. 2. Memory and secondary storage management: 1. allows the user to organize their data on secondary storage into files & folders 2. also manages the use of main memory by splitting main memory into ...
... Input and output: allows computer to display and get data from the I/O devices to interact with users. 2. Memory and secondary storage management: 1. allows the user to organize their data on secondary storage into files & folders 2. also manages the use of main memory by splitting main memory into ...
Example Sheet for Operating Systems I (Part IA)
... (b) A context switch can be implemented by a flip-flop stored in the translation lookaside buffer (TLB). (c) Non-blocking I/O is possible even when using a block device. (d) Shortest job first (SJF) is an optimal scheduling algorithm. (e) Round-robin scheduling can suffer from the so-called ‘convoy eff ...
... (b) A context switch can be implemented by a flip-flop stored in the translation lookaside buffer (TLB). (c) Non-blocking I/O is possible even when using a block device. (d) Shortest job first (SJF) is an optimal scheduling algorithm. (e) Round-robin scheduling can suffer from the so-called ‘convoy eff ...
os-1
... Have a deeper understanding of common operating systems in the market (e.g. Windows, Unix, MS-DOS) and the issues associated with them To be able to use performance measures ...
... Have a deeper understanding of common operating systems in the market (e.g. Windows, Unix, MS-DOS) and the issues associated with them To be able to use performance measures ...
virtual machine
... • With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers ...
... • With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers ...
Operating Systems (OS)
... e.g. a batch job, the shell of a login session, a program run The execution of processes is controlled by the kernel and is interlaced – this part of the kernel is known as the despatcher or low-level scheduler when a process ends, or uses up its scheduled time, or cannot be continued because an int ...
... e.g. a batch job, the shell of a login session, a program run The execution of processes is controlled by the kernel and is interlaced – this part of the kernel is known as the despatcher or low-level scheduler when a process ends, or uses up its scheduled time, or cannot be continued because an int ...
Slide 1
... • An operating system combined with a processor is known as a platform. • Microsoft Windows/Intel • Apple Macintosh/Motorola ...
... • An operating system combined with a processor is known as a platform. • Microsoft Windows/Intel • Apple Macintosh/Motorola ...
History of Operating Systems
... worlds computers run on windows operating systems or DOS. In the summer of 1995, Internet Explorer is released. ...
... worlds computers run on windows operating systems or DOS. In the summer of 1995, Internet Explorer is released. ...
Slides(PowerPoint)
... Temporarily unused pages are stored on disk (swapped out) When they are needed again, they are brought back into the memory (swapped in) OS Spring’03 ...
... Temporarily unused pages are stored on disk (swapped out) When they are needed again, they are brought back into the memory (swapped in) OS Spring’03 ...
OS Components and Structure
... Device drivers are the processes responsible for each device type. A driver encapsulates devicespecific knowledge, e.g., for device initiation and control, interrupt handling, and errors. There may be a process for each device, or even for each I/O request, depending on the particular OS. ...
... Device drivers are the processes responsible for each device type. A driver encapsulates devicespecific knowledge, e.g., for device initiation and control, interrupt handling, and errors. There may be a process for each device, or even for each I/O request, depending on the particular OS. ...
bt0070 - SMU Assignments
... 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 resources of a computer. A key component of system software, th ...
... 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 resources of a computer. A key component of system software, th ...
Operating Systems Introduction
... To provide an environment for a computer user to execute programs on computer hardware in a convenient and efficient manner (Shells, Windows, Terminals, Executable files concept). ...
... To provide an environment for a computer user to execute programs on computer hardware in a convenient and efficient manner (Shells, Windows, Terminals, Executable files concept). ...
View File
... • The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values • The caller need know nothing about how the system call is implemented – Just needs to obey API and understand what OS will do as a result call – Most details of OS inte ...
... • The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values • The caller need know nothing about how the system call is implemented – Just needs to obey API and understand what OS will do as a result call – Most details of OS inte ...
2. OS Components
... interpreter, which is the interface between the user and the operating system. Some operating systems include the command interpreter in the kernel. Other operating systems, such as MS-DOS and UNIX, treat the command interpreter as a special program that is running when a job is initiated, or when a ...
... interpreter, which is the interface between the user and the operating system. Some operating systems include the command interpreter in the kernel. Other operating systems, such as MS-DOS and UNIX, treat the command interpreter as a special program that is running when a job is initiated, or when a ...
Operating Systems Operating System Component and Structure
... • Implements virtual memories for each process ...
... • Implements virtual memories for each process ...
Module 3: Operating
... to its logical conclusion. It treats hardware and the operating system kernel as though they were all hardware. A virtual machine provides an interface identical to the underlying bare hardware. The operating system creates the illusion of multiple processes, each executing on its own processor ...
... to its logical conclusion. It treats hardware and the operating system kernel as though they were all hardware. A virtual machine provides an interface identical to the underlying bare hardware. The operating system creates the illusion of multiple processes, each executing on its own processor ...
Module 3: Operating-System Structures
... to its logical conclusion. It treats hardware and the operating system kernel as though they were all hardware. A virtual machine provides an interface identical to the underlying bare hardware. The operating system creates the illusion of multiple processes, each executing on its own processor with ...
... to its logical conclusion. It treats hardware and the operating system kernel as though they were all hardware. A virtual machine provides an interface identical to the underlying bare hardware. The operating system creates the illusion of multiple processes, each executing on its own processor with ...
Module 3: Operating-System Structures
... • MS-DOS – written to provide the most functionality in the least space – not divided into modules – Although MS-DOS has some structure, its interfaces and levels of functionality are not well separated ...
... • MS-DOS – written to provide the most functionality in the least space – not divided into modules – Although MS-DOS has some structure, its interfaces and levels of functionality are not well separated ...
資工系網媒所NEWS實驗室Chapter 2
... 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 UNIX, Linux, and Mac OS X), and Java API for the Java virtual machine (JVM) Why use APIs rather than system calls? (Note ...
... 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 UNIX, Linux, and Mac OS X), and Java API for the Java virtual machine (JVM) Why use APIs rather than system calls? (Note ...