Silberschatz_ AllNotes
... operating system must provide some means to perform I/O. File-system manipulation - capability to read, write, create, and delete files. Communications - exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented vi ...
... operating system must provide some means to perform I/O. File-system manipulation - capability to read, write, create, and delete files. Communications - exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented vi ...
address space
... – blocking a process whose u-l thread has requested I/O, even though other threads can run in that process – removing a process whose u-l thread is holding a lock ...
... – blocking a process whose u-l thread has requested I/O, even though other threads can run in that process – removing a process whose u-l thread is holding a lock ...
CS 3100
... If pid equals -1, then sig is sent to every process except for the first one. If pid is less than -1, then sig is sent to every in the process group -pid. ...
... If pid equals -1, then sig is sent to every process except for the first one. If pid is less than -1, then sig is sent to every in the process group -pid. ...
Operating Systems and File Management 4 Operating System
... 4 File Management Metaphors Storage metaphors help you visualize and mentally organize the files on your disks and other storage devices ...
... 4 File Management Metaphors Storage metaphors help you visualize and mentally organize the files on your disks and other storage devices ...
Interrupts
... Save all registers which could be modified by the interrupt handler onto the stack or in a private memory area. The hardware itself may save some critical registers such as the status register along with the return address. The handler software is then expected to immediately save all other register ...
... Save all registers which could be modified by the interrupt handler onto the stack or in a private memory area. The hardware itself may save some critical registers such as the status register along with the return address. The handler software is then expected to immediately save all other register ...
Lecture 3 Processes and Communication
... • Eventually, process A runs again, starting from the place it left off. – It looks at next_free slot, finds a 7 there, and writes its file name in slot 7 – Then it computes next-free slot + 1, which is 8, and sets in to 8. ...
... • Eventually, process A runs again, starting from the place it left off. – It looks at next_free slot, finds a 7 there, and writes its file name in slot 7 – Then it computes next-free slot + 1, which is 8, and sets in to 8. ...
How do Users and Processes interact with the Operating System
... Modular Kernel Most modern operating systems implement kernel modules Uses object-oriented–like approach Each core component is separate Each talks to the others over known interfaces Each is loadable as needed within the kernel, so you could download a new device driver for your OS and load it at r ...
... Modular Kernel Most modern operating systems implement kernel modules Uses object-oriented–like approach Each core component is separate Each talks to the others over known interfaces Each is loadable as needed within the kernel, so you could download a new device driver for your OS and load it at r ...
Getting Started with Real Time Operating Systems (RTOS)
... This document is submitted as the first Survey Paper to Dr. Khalil in fall 2002. It is intended to be a learning guide in the area of Real Time Operating Systems (RTOS). It serves as a help guide for the concepts of RTOS in general and VxWorks in particular. ...
... This document is submitted as the first Survey Paper to Dr. Khalil in fall 2002. It is intended to be a learning guide in the area of Real Time Operating Systems (RTOS). It serves as a help guide for the concepts of RTOS in general and VxWorks in particular. ...
1. Introduction
... generally, through the interrupt vector, which contains the addresses of all the service routines Interrupt architecture must save the address of the interrupted instruction Incoming interrupts are disabled while another interrupt is being processed to prevent a lost interrupt A trap is a soft ...
... generally, through the interrupt vector, which contains the addresses of all the service routines Interrupt architecture must save the address of the interrupted instruction Incoming interrupts are disabled while another interrupt is being processed to prevent a lost interrupt A trap is a soft ...
Introduction to Operating Systems (continued)
... Definition – File • A (potentially) large amount of information or data that lives a (potentially) very long time • Often much larger than the memory of the computer • Often much longer than any computation • Sometimes longer than life of machine itself ...
... Definition – File • A (potentially) large amount of information or data that lives a (potentially) very long time • Often much larger than the memory of the computer • Often much longer than any computation • Sometimes longer than life of machine itself ...
operating system
... The most common secondary storage device is a magnetic disk, which provides storage for both programs and data. Most programs (web browsers, compilers, word processors, spreadsheets, and so on) are stored on disk until they are loaded into memory. Many programs then use the disk as both a source and ...
... The most common secondary storage device is a magnetic disk, which provides storage for both programs and data. Most programs (web browsers, compilers, word processors, spreadsheets, and so on) are stored on disk until they are loaded into memory. Many programs then use the disk as both a source and ...
PPT
... So, multi-threading is useful even on a uniprocessor. But, threads, even when supported separately from processes in the kernel, are too slow. ...
... So, multi-threading is useful even on a uniprocessor. But, threads, even when supported separately from processes in the kernel, are too slow. ...
Kernel I/O Subsystem
... - STREAM head interfaces with the user process - driver end interfaces with the device - zero or more STREAM modules between them. ...
... - STREAM head interfaces with the user process - driver end interfaces with the device - zero or more STREAM modules between them. ...
Lecture 3: Concurrency
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
Programming with TCP/IP
... the Transport Layer in the TCP/IP protocol suite, which is part of the BSD Unix. ...
... the Transport Layer in the TCP/IP protocol suite, which is part of the BSD Unix. ...
An Overview of Fault Tolerance Techniques for Real
... µITRON and RTAI are examples of such RTOSs that disable MMU [11]. By disabling MMU the operating system and all processes are run in the same address space and each task has access to operating system’s and other processes’ codes and data. Hence a bad written code or a bug in a code, for example in ...
... µITRON and RTAI are examples of such RTOSs that disable MMU [11]. By disabling MMU the operating system and all processes are run in the same address space and each task has access to operating system’s and other processes’ codes and data. Hence a bad written code or a bug in a code, for example in ...
Chapter 05: Concurrency: Mutual Exclusion and Synchronization
... Enforce Single Access • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends ...
... Enforce Single Access • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends ...
Chapter 5 Concurrency: Mutual Exclusion and Exclusion and
... Enforce Single Access • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends ...
... Enforce Single Access • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends ...
Section 3A: Windows forensics
... Exploring Microsoft File Structures • Disk space is allocated by cluster • Results in drive slack • If you create a 5000 byte Word file then on a FAT 16 1.6 GB disk then the OS reserves 1 cluster • However in FAT 16 32,000 bytes allocated to your file = 27,000 file slack • 5000 byte file uses 10 se ...
... Exploring Microsoft File Structures • Disk space is allocated by cluster • Results in drive slack • If you create a 5000 byte Word file then on a FAT 16 1.6 GB disk then the OS reserves 1 cluster • However in FAT 16 32,000 bytes allocated to your file = 27,000 file slack • 5000 byte file uses 10 se ...
Virtual machine - Duke Computer Science
... • What do we do if we only have two privilege levels? • OS shares lower privilege level with guest applications • Run guest apps and guest OS in different address spaces ...
... • What do we do if we only have two privilege levels? • OS shares lower privilege level with guest applications • Run guest apps and guest OS in different address spaces ...
Chapter 6: CPU Scheduling 6.1 Basic Concepts CPU–I/O Burst Cycle
... Selects from among the processes in memory that are ready to execute ( from a ready queue ), and allocates the CPU to one of them. The selection process is carried out by the short-term scheduler ( or CPU scheduler ) CPU scheduling decisions may take place when a process: 1. Switches from running to ...
... Selects from among the processes in memory that are ready to execute ( from a ready queue ), and allocates the CPU to one of them. The selection process is carried out by the short-term scheduler ( or CPU scheduler ) CPU scheduling decisions may take place when a process: 1. Switches from running to ...
CMPT 880: Internet Architectures and Protocols
... responsive Long processes (CPU bound) sink to bottom served FCFS more throughput ...
... responsive Long processes (CPU bound) sink to bottom served FCFS more throughput ...