UNIT 1
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control stat ...
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control stat ...
process
... • One process can create other processes to do its work. These are child processes and the creator is the parent. • In some systems, the parent defines (or donates) resources and privileges for its children. • When a child is created, the parent may either wait for it to finish its task, or continue ...
... • One process can create other processes to do its work. These are child processes and the creator is the parent. • In some systems, the parent defines (or donates) resources and privileges for its children. • When a child is created, the parent may either wait for it to finish its task, or continue ...
Operating Systems
... Unix supports sharing of open files between different processes. Three data structures are used by the kernel for I/O: 1. Every process has an entry in the process table. Within each process table entry is a table of open file descriptors, a vector, with one entry per descriptor. 2. The kernel maint ...
... Unix supports sharing of open files between different processes. Three data structures are used by the kernel for I/O: 1. Every process has an entry in the process table. Within each process table entry is a table of open file descriptors, a vector, with one entry per descriptor. 2. The kernel maint ...
Chapter 13 Troubleshooting the Operating System
... • If it is a daemon that is crashing regularly try using other methods of starting it and running it. ...
... • If it is a daemon that is crashing regularly try using other methods of starting it and running it. ...
ITE-II-ch13
... • If it is a daemon that is crashing regularly try using other methods of starting it and running it. ...
... • If it is a daemon that is crashing regularly try using other methods of starting it and running it. ...
Chapter 6
... Security procedures, such as passwords for accessing the system and particular drives or files, as well as user profiles. ...
... Security procedures, such as passwords for accessing the system and particular drives or files, as well as user profiles. ...
Lecture 6 File Systems
... • The operating system provides a uniform logical view of information storage. • The operating system abstracts from the physical properties of its storage devices to define a logical storage unit, the file. • Files are mapped by the operating system onto physical devices. • These storage devices ar ...
... • The operating system provides a uniform logical view of information storage. • The operating system abstracts from the physical properties of its storage devices to define a logical storage unit, the file. • Files are mapped by the operating system onto physical devices. • These storage devices ar ...
2007-06.pdf
... No: disabling interrupts lets a processor continue execution without indeed being interrupted. That means that a single thread of control is executing. However, with multicore processors we can easily have multiple threads executing at the same time, and disabling interrupts is not going to prevent ...
... No: disabling interrupts lets a processor continue execution without indeed being interrupted. That means that a single thread of control is executing. However, with multicore processors we can easily have multiple threads executing at the same time, and disabling interrupts is not going to prevent ...
Operating System Architecture
... – many programs and blocks of data must reside in main memory concurrently – the memory manager must • find and assign memory space for these needs and • ensure that the actions of each program are restricted to the program’s allotted space ...
... – many programs and blocks of data must reside in main memory concurrently – the memory manager must • find and assign memory space for these needs and • ensure that the actions of each program are restricted to the program’s allotted space ...
Formatting and Partitioning Hard Drives, and DOS
... When data is “erased” during a high-level format, it is still readable until new data has written over it Some file systems don’t write to the same locations, allowing data to stay on disk until disk space starts having to be recycled ...
... When data is “erased” during a high-level format, it is still readable until new data has written over it Some file systems don’t write to the same locations, allowing data to stay on disk until disk space starts having to be recycled ...
Chapter 21: Case Study: Windows XP
... information in .ini (initialization) files scattered all around the disk Regedit is a program to inspect and modify the registry but be carefull ...
... information in .ini (initialization) files scattered all around the disk Regedit is a program to inspect and modify the registry but be carefull ...
OPERATING SYSTEMS DESIGN AND IMPLEMENTATION Third
... (actually using the CPU at that instant). 2. Ready (runnable; temporarily stopped to let another process run). 3. Blocked (unable to run until some external event happens). ...
... (actually using the CPU at that instant). 2. Ready (runnable; temporarily stopped to let another process run). 3. Blocked (unable to run until some external event happens). ...
Chapter 1 Introduction
... Computer As A Complex System • Many resources – Hardware: processors, memory, disks, printers, keyboard, display, network interfaces, … – Software: office tools, multimedia players, … ...
... Computer As A Complex System • Many resources – Hardware: processors, memory, disks, printers, keyboard, display, network interfaces, … – Software: office tools, multimedia players, … ...
Processes and Threads
... Process Management • Process management is a major function of the OS • OS manages CPU sharing with several processes in memory at the same time • The concept above is called multiprogramming ...
... Process Management • Process management is a major function of the OS • OS manages CPU sharing with several processes in memory at the same time • The concept above is called multiprogramming ...
CBA Software - Hoxie Public Schools
... Translators Computers cannot read program statements in programming language format, such as Visual Basic or Java program statements. Language translator programs convert English-like software programs into machine code that can be understood by the computer. Each converted English-like instruction ...
... Translators Computers cannot read program statements in programming language format, such as Visual Basic or Java program statements. Language translator programs convert English-like software programs into machine code that can be understood by the computer. Each converted English-like instruction ...
Introduction
... freed, so the next program can be loaded and executed. To improve response and utilization, few programs reside in the memory, requiring memory management. OS is responsible for the following to manage memory: • Keeping track of which parts of memory are currently being used and who is using them. • ...
... freed, so the next program can be loaded and executed. To improve response and utilization, few programs reside in the memory, requiring memory management. OS is responsible for the following to manage memory: • Keeping track of which parts of memory are currently being used and who is using them. • ...
Design of OSes
... • Crossing this hardware barrier is costly. • System calls take 10x-1000x more time than a procedure call ...
... • Crossing this hardware barrier is costly. • System calls take 10x-1000x more time than a procedure call ...
CISB222 - Department of Computer and Information Science
... There will be approximately 5 homework assignments and 2 course projects. Course projects are group projects of 2-3 students per group. No late submission is accepted. Possible revision of homework/project grades may be discussed within one week from the grade announcement. Test and Exam: On ...
... There will be approximately 5 homework assignments and 2 course projects. Course projects are group projects of 2-3 students per group. No late submission is accepted. Possible revision of homework/project grades may be discussed within one week from the grade announcement. Test and Exam: On ...
Chapter 3: Processes(PPT)
... instruction (or a jmp to it if many exit points) Some O/S terminate all children of a terminating process, “cascading termination” Parents can terminate their children Arbitrary processes cannot terminate each other O/S can terminate a process for a variety of reasons (e.g., security, on errors) Exi ...
... instruction (or a jmp to it if many exit points) Some O/S terminate all children of a terminating process, “cascading termination” Parents can terminate their children Arbitrary processes cannot terminate each other O/S can terminate a process for a variety of reasons (e.g., security, on errors) Exi ...
anna university chennai:: chennai 600 025
... Free space is maintained as a linked list of nodes with each node having the starting byte address and the ending byte address of a free block. Each memory request consists of the process-id and the amount of storage space required in bytes. Allocated memory space is again maintained as a linked lis ...
... Free space is maintained as a linked list of nodes with each node having the starting byte address and the ending byte address of a free block. Each memory request consists of the process-id and the amount of storage space required in bytes. Allocated memory space is again maintained as a linked lis ...
Difference Between Paging and segmentation
... One time, I was at the post office standing in line waiting my turn to be served. My turn came but I was not fully prepared because my mail was not prepackaged. They gave me an empty box to do that on the side. I started packaging my mail while another customer is occupying my spot. It does not make ...
... One time, I was at the post office standing in line waiting my turn to be served. My turn came but I was not fully prepared because my mail was not prepackaged. They gave me an empty box to do that on the side. I started packaging my mail while another customer is occupying my spot. It does not make ...
Operating Systems
... • An interruption in the normal execution flow of a processor – a mechanism for causing the processor to suspend its current computation and take up some new task » old context must be preserved » control can be returned to the original task at some later time ...
... • An interruption in the normal execution flow of a processor – a mechanism for causing the processor to suspend its current computation and take up some new task » old context must be preserved » control can be returned to the original task at some later time ...
Lecture - University of Hawaii
... – Paradigm for cooperating processes, producer process produces information that is consumed by a consumer process – For example, a web server produces HTML files & images, which a web browser consumes • unbounded-buffer places no practical limit on the size of the buffer • bounded-buffer assumes th ...
... – Paradigm for cooperating processes, producer process produces information that is consumed by a consumer process – For example, a web server produces HTML files & images, which a web browser consumes • unbounded-buffer places no practical limit on the size of the buffer • bounded-buffer assumes th ...
Course Overview
... Virtual Memory is an abstraction for the main memory and I/O devices Processes are abstractions for the processor, main memory, and I/O devices ...
... Virtual Memory is an abstraction for the main memory and I/O devices Processes are abstractions for the processor, main memory, and I/O devices ...