Lec10-OS-process - ECE Users Pages
... One thread accepts requests When a request comes in, separate thread is created to service Many threads to support thousands of client requests ...
... One thread accepts requests When a request comes in, separate thread is created to service Many threads to support thousands of client requests ...
Operating System Organization Purpose of an OS
... use of resources •Processor Modes - hardware mode bit is used to distinguish between OS and user instructions •Kernels - most critical part of OS placed in kernel (trusted software module) •Method of invoking system service - calling a system function or sending a message to a system process ...
... use of resources •Processor Modes - hardware mode bit is used to distinguish between OS and user instructions •Kernels - most critical part of OS placed in kernel (trusted software module) •Method of invoking system service - calling a system function or sending a message to a system process ...
Operating Systems Security
... (e.g., memory page or file) could be accessed without going through the TCB ●TCB acts as a reference monitor that cannot be bypassed ...
... (e.g., memory page or file) could be accessed without going through the TCB ●TCB acts as a reference monitor that cannot be bypassed ...
Operating Systems Overview
... Useful when the application consists of several tasks that do not need to be serialized Gives the programmer a greater control over the timing of application-related events All threads within the same process share the same data and resources and a part of the process’s execution context It is easie ...
... Useful when the application consists of several tasks that do not need to be serialized Gives the programmer a greater control over the timing of application-related events All threads within the same process share the same data and resources and a part of the process’s execution context It is easie ...
slides 1
... • A state is said to be safe, if it has a process sequence {P1, P2,…, Pn}, such that for each Pi, the resources that Pi can still request can be satisfied by the currently available resources plus the resources held by all Pj, where j < i • State is safe because OS can definitely avoid deadlock – by ...
... • A state is said to be safe, if it has a process sequence {P1, P2,…, Pn}, such that for each Pi, the resources that Pi can still request can be satisfied by the currently available resources plus the resources held by all Pj, where j < i • State is safe because OS can definitely avoid deadlock – by ...
The UNIX Operating System - Niagara College Technology
... From a list of employees, find all the engineers, alphabetize, and print the list. ...
... From a list of employees, find all the engineers, alphabetize, and print the list. ...
Course Review
... • A state is said to be safe, if it has a process sequence {P1, P2,…, Pn}, such that for each Pi, the resources that Pi can still request can be satisfied by the currently available resources plus the resources held by all Pj, where j < i • State is safe because OS can definitely avoid deadlock – by ...
... • A state is said to be safe, if it has a process sequence {P1, P2,…, Pn}, such that for each Pi, the resources that Pi can still request can be satisfied by the currently available resources plus the resources held by all Pj, where j < i • State is safe because OS can definitely avoid deadlock – by ...
lec4
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
MIDTERM #1 - School of Computer Science
... B) making sure that each layer hides certain data structures, hardware, and operations from higher-level layers C) appropriately defining the various layers D) debugging a particular layer ...
... B) making sure that each layer hides certain data structures, hardware, and operations from higher-level layers C) appropriately defining the various layers D) debugging a particular layer ...
03-60-330-01 Winter 2010 - School of Computer Science
... C) determines which process is to be executed next D) is an example of a process queue ...
... C) determines which process is to be executed next D) is an example of a process queue ...
Two Types of Software: System Software: Operating Systems
... computer is useless. Most desktop or laptop PC’s that you buy come pre-loaded with Windows 8 (newest). Macintosh computers come pre-loaded with OS X Mavericks. Many corporate servers use the Linux or UNIX operating systems. The operating system on these computers is Windows7. The Operating System's ...
... computer is useless. Most desktop or laptop PC’s that you buy come pre-loaded with Windows 8 (newest). Macintosh computers come pre-loaded with OS X Mavericks. Many corporate servers use the Linux or UNIX operating systems. The operating system on these computers is Windows7. The Operating System's ...
Chapter 2
... The OS is a set of programs that controls access to the hardware and software resources of the computer. kernel - the part of the OS that supervises the overall operation of the OS – resident when computer is on (stored in main memory) ...
... The OS is a set of programs that controls access to the hardware and software resources of the computer. kernel - the part of the OS that supervises the overall operation of the OS – resident when computer is on (stored in main memory) ...
ppt - Fordham University
... – 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 use ...
... – 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 use ...
10CSE
... subset of jobs (first k jobs). At some point, each discipline chooses a different job (FCFS ...
... subset of jobs (first k jobs). At some point, each discipline chooses a different job (FCFS ...
operating systems structures
... I/O Operations: A running program may require I/O, which may involve a file or an I/O device. For efficiency and protection user usually cannot control I/O devices directly. The OS provides a means to do I/O. ƒ File System Manipulation: Programs need to read, write files. Also they should be able to ...
... I/O Operations: A running program may require I/O, which may involve a file or an I/O device. For efficiency and protection user usually cannot control I/O devices directly. The OS provides a means to do I/O. ƒ File System Manipulation: Programs need to read, write files. Also they should be able to ...
Process Concept and State 1 Introduction
... The Exit state indicates a process has been released from the pool of executable processes by the operating system, either because it halted or because it aborted from some reason. This state enables some accounting programs to record the processor time and other resources utilized by the process fo ...
... The Exit state indicates a process has been released from the pool of executable processes by the operating system, either because it halted or because it aborted from some reason. This state enables some accounting programs to record the processor time and other resources utilized by the process fo ...
Lecture Notes
... • Change status of p to running (status of self already changed to ready/blocked) • Context switch—output name of running process Operating Systems ...
... • Change status of p to running (status of self already changed to ready/blocked) • Context switch—output name of running process Operating Systems ...
System Structures
... To describe the services an operating system provides to users, processes, and other systems To discuss the various ways of structuring an operating system To explain how operating systems are installed and customized and how they boot ...
... To describe the services an operating system provides to users, processes, and other systems To discuss the various ways of structuring an operating system To explain how operating systems are installed and customized and how they boot ...
Operating Systems
... The basic unit of software that the operating system deals with in scheduling the work done by the processor. Not the same as an application, since an application can cause multiple processes to be executed. Can be defined as software that performs some action and can be controlled - by a user, by o ...
... The basic unit of software that the operating system deals with in scheduling the work done by the processor. Not the same as an application, since an application can cause multiple processes to be executed. Can be defined as software that performs some action and can be controlled - by a user, by o ...
Introduction to Operating Systems
... The OS must allocate resources to processes, enable processes to share and exchange information, protect the resources of each process from other processes and enable synchronisation among processes. To meet these requirements, the OS must maintain a data structure for each process, which describes ...
... The OS must allocate resources to processes, enable processes to share and exchange information, protect the resources of each process from other processes and enable synchronisation among processes. To meet these requirements, the OS must maintain a data structure for each process, which describes ...
Memory Management
... Memory protection: Application programs cannot alter Monitor private data. Timer: Application programs allowed to run for a specified amount of time. Interrupts: Gives monitor control over application program. Privileged instructions: The monitor only can execute I/O instructions, inhibit in ...
... Memory protection: Application programs cannot alter Monitor private data. Timer: Application programs allowed to run for a specified amount of time. Interrupts: Gives monitor control over application program. Privileged instructions: The monitor only can execute I/O instructions, inhibit in ...
Module 3: Operating
... • Program execution – system capability to load a program into memory and to run it. • 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 ...
... • Program execution – system capability to load a program into memory and to run it. • 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 ...