Section 10: Intro to I/O and File Systems
... • Asynchronous I/O For I/O operations, we can have the requesting process sleep until the operation is complete, or have the call return immediately and have the process continue execution and later notify the process when the operation is complete. • Memory-Mapped File A memory-mapped file is a seg ...
... • Asynchronous I/O For I/O operations, we can have the requesting process sleep until the operation is complete, or have the call return immediately and have the process continue execution and later notify the process when the operation is complete. • Memory-Mapped File A memory-mapped file is a seg ...
tasks, threads and processes, confused?
... time requirements is incredibly difficult (and quite an art). A simpler programming model than one large sequential C program, is to separate the code into multiple programs, each of which is written as ...
... time requirements is incredibly difficult (and quite an art). A simpler programming model than one large sequential C program, is to separate the code into multiple programs, each of which is written as ...
file
... • Files with direct access are conceptually divided into numbered logical records • Direct access allows the user to set the file pointer to any particular record by specifying the record number ...
... • Files with direct access are conceptually divided into numbered logical records • Direct access allows the user to set the file pointer to any particular record by specifying the record number ...
Advanced Operating Systems
... Catering to Applications Provide resource needs of an application CPU, memory, device access ...
... Catering to Applications Provide resource needs of an application CPU, memory, device access ...
Operating System
... of data is in at any particular moment, the operating system has to maintain, for each running process, a ‘map’ showing which blocks of virtual storage are currently in real memory and where they are. ...
... of data is in at any particular moment, the operating system has to maintain, for each running process, a ‘map’ showing which blocks of virtual storage are currently in real memory and where they are. ...
yanc: Yet Another Network Controller References
... by standard file I/O, and we do not need special applications which sit at some privileged point between the network OS and hardware. Program dependencies and ordering is configured through text files – e.g., a program can be packaged with a config file in /usr/share/yanc/conf.d/ with a default prio ...
... by standard file I/O, and we do not need special applications which sit at some privileged point between the network OS and hardware. Program dependencies and ordering is configured through text files – e.g., a program can be packaged with a config file in /usr/share/yanc/conf.d/ with a default prio ...
Lecture7
... Condition variables: indicate an event and have no value. One cannot store a value into nor retrieve a value from a condition variable. If a thread must wait for an event to occur, that thread waits on the corresponding condition variable. Two operations can be performed on a condition variable: Wai ...
... Condition variables: indicate an event and have no value. One cannot store a value into nor retrieve a value from a condition variable. If a thread must wait for an event to occur, that thread waits on the corresponding condition variable. Two operations can be performed on a condition variable: Wai ...
Lecture Notes
... – data structures and functions • Design/implement a driver program (shell) – command language and interpreter • Instantiate the manager to include at start-up: ...
... – data structures and functions • Design/implement a driver program (shell) – command language and interpreter • Instantiate the manager to include at start-up: ...
OS imp structures
... (what is the organizational principle?) • Simple – Only one or two levels of code ...
... (what is the organizational principle?) • Simple – Only one or two levels of code ...
CS111—Operating System Principles
... History Phase I: Hardware Expensive, Humans Cheap When computers used to cost millions of dollars, operating systems aimed for more efficient use of the hardware. Back in the transistor-based technology, early mainframes were first run by human operators. The unit of processing was a job, or predefi ...
... History Phase I: Hardware Expensive, Humans Cheap When computers used to cost millions of dollars, operating systems aimed for more efficient use of the hardware. Back in the transistor-based technology, early mainframes were first run by human operators. The unit of processing was a job, or predefi ...
Chapter 1 Computer Basics
... serve the next process in the queue. – The manager maintains a queue for each I/O device or one or more queues for similar I/O devices. – The manager controls the different policies for ...
... serve the next process in the queue. – The manager maintains a queue for each I/O device or one or more queues for similar I/O devices. – The manager controls the different policies for ...
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 ...
project2 - 408 Coding School
... system. Be sure to review the programming project in Chapter 2, which deals with creating Linux kernel modules, before you begin this project. The project can be completed using the Linux virtual machine provided with this text. The instructions are posted at the textbook companion web site http://w ...
... system. Be sure to review the programming project in Chapter 2, which deals with creating Linux kernel modules, before you begin this project. The project can be completed using the Linux virtual machine provided with this text. The instructions are posted at the textbook companion web site http://w ...
doc
... Language translators convert programming instructions written by programmers into a language that computers understand and process. For example, you may have a C++ compiler that translates the C++ source code into an executable file the computer can run. ...
... Language translators convert programming instructions written by programmers into a language that computers understand and process. For example, you may have a C++ compiler that translates the C++ source code into an executable file the computer can run. ...
Operating systems and security
... – But the FTP daemon program was in the FTP domain – /bin/sh is of a type not executable from this domain • And so the buffer overflow can’t fork a shell successfully ...
... – But the FTP daemon program was in the FTP domain – /bin/sh is of a type not executable from this domain • And so the buffer overflow can’t fork a shell successfully ...
Study Guide to Accompany Operating Systems Concepts essentials
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
WORD
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
... ◦ With modularity, layers are selected such that each uses functions (operations) and services of only lower-level layers Virtual machine: uses layered approach, treats hardware and the OS kernel as though they were all hardware. ◦ Host creates the illusion that a process has its own processor and o ...
OPERATING SYSTEMS UNIT I Syllabus: Operating Systems
... 5. List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user level programs to provide these services. 6. Give an overview about threads. 7. Explain in detail about the threading issues. 8. Writ ...
... 5. List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user level programs to provide these services. 6. Give an overview about threads. 7. Explain in detail about the threading issues. 8. Writ ...
CST1215 Operating System Fundamentals
... Students and all others who work with information, ideas, texts, images, music, inventions, and other intellectual property owe their audience and sources accuracy and honesty in using, crediting, and citing sources. As a community of intellectual and professional workers, the College recognizes its ...
... Students and all others who work with information, ideas, texts, images, music, inventions, and other intellectual property owe their audience and sources accuracy and honesty in using, crediting, and citing sources. As a community of intellectual and professional workers, the College recognizes its ...
networking operating system
... An operating system manages the whole computer for us, yes? And a network is like a single-user system except for the communication and shared resources bit; so let us now define a few of the relevant network O/S concepts: Requests > this is any petition from a user; could be for a file to be opened ...
... An operating system manages the whole computer for us, yes? And a network is like a single-user system except for the communication and shared resources bit; so let us now define a few of the relevant network O/S concepts: Requests > this is any petition from a user; could be for a file to be opened ...
Operating Systems
... • Operating Systems are among the most complex pieces of software ever developed • Major advances include: ...
... • Operating Systems are among the most complex pieces of software ever developed • Major advances include: ...
Lecture 6
... 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, main memory, file storage, I/O devices. – Accounting - To keep track of which users use how much and what ...
... 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, main memory, file storage, I/O devices. – Accounting - To keep track of which users use how much and what ...
Document
... • Specialized programs that allow communication between a device and the computer • Loaded into memory each time a computer is started • When a new device is added, new device drivers must be installed ...
... • Specialized programs that allow communication between a device and the computer • Loaded into memory each time a computer is started • When a new device is added, new device drivers must be installed ...
slides
... The run-time library for most programming languages provides a system-call interface. Typically, a number associated with each system call. System-call interface (or kernel) maintains a table indexed according to these numbers. The system call interface invokes intended system call in operating syst ...
... The run-time library for most programming languages provides a system-call interface. Typically, a number associated with each system call. System-call interface (or kernel) maintains a table indexed according to these numbers. The system call interface invokes intended system call in operating syst ...