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Interrupts Defn: an event external to the currently executing process that causes a change in the normal flow of instruction execution...

Interrupt vector An interrupt vector is the memory address of an interrupt handler, or an index into an array called an interrupt vector t...

Firewall A firewall can either be software-based or hardware-based and is used to help keep a network secure. Its primary objective is to ...

Two Phase Locking The most commonly implemented locking mechanism is called Two Phased Locking or 2PL 2PL is a concurrency control mech...

Processor or Virtual Storage · 1 Bit = Binary Digit · 8 Bits = 1 Byte · 1024 Bytes = 1 ...

Suppose we have the following Java code in which a downcast is being performed: class Parent{ /* ... */} class ChildClass extends Pare...

Process Control Block The OS must know specific information about processes in order to manage, control them and also to implement th...

Pipes The only real IPC facility available in early Unices was the ``pipe.'' Pipes are creating using the pipe system call %...

The Buddy System The buddy system is a memory allocation and management algorithm that manages memory in power of two increments A ...

Block devices Organize data in fixed-size blocks Transfers are in units of blocks Blocks have addresses and data are therefore addre...

Software in OS to manage I/O to a device is  called a device driver A device driver abstracts specific device hardware into a generic mode...

A modular kernel is an attempt to merge the good points of kernel-level drivers and third-party drivers In a modular kernel, some part of ...

A way of making sure that if one process is using a shared modifiable data, the other processes will be excluded from doing the same thing....

A race condition is a situation in which a computer system tries to process at least two operations simultaneously, http://www.wisegeek.co...

Critical section In concurrent programming, a critical section is a piece of code that accesses a shared resource (data structure or devi...

fork(): The fork system call does not take an argument. When a fork() system call is made, the operating system generates a copy of t...

What is the meaning of the term "busy waiting"? In computer systems organization or operating systems, "busy waiting" ...

What is process? In computing, a process is an instance of a computer program that is being executed. It contains the program code and it...

 Isletim Sisteminin Temel Görevleri • Islem Yönetimi  (ProcessManagement) • Bellek Yönetimi  (MemoryManagement) • Giris/Çikis Yönetimi ...

Process States and Their Transitions  When a process is born, its life in the system begins  During its existence a process executes, it...

ILK NESIL iSLETIM SISTEMLERI (1945 – 1955) 1940 larda Howard Aiken, John von Neumann, Jpresper Eckert ve William Mauncley VAKUM TÜPLERI...

* Mainframe (Ana Çati) sistemleri * Sunucu(Server) isletim sistemleri * Çok islemcili isletim sistemleri * Kisisel bilgisayar isletim s...

TEMEL ISLETIM SISTEMI  YAPILARI 1.Tek Parça (monolitik) Sistemler 2.Katmanli(Layered) Sistemler 3.Sanal Makineler(Virtual Machines) 4...

In computer science, a loop invariant is an invariant used to prove properties of loops. Informally, a loop invariant is a statement of the...

real-time ratio=average-case running time / worst-case running time bubblesort heapsort insertion mergesort quicksort best n nlogn...

Directed Acyclic Graphs A directed acyclic graph (DAG) is a directed graph that contains no cycles http://www.csse.monash.edu/~lloyd/...

Event-driven architecture Event-driven architecture (EDA) is a software architecture pattern promoting the production, detection, consum...

Semantic Web The Semantic Web is about two things. It is about common formats for integration and combination of data drawn from diverse...

PRINCE2 is a process-based approach for project management, providing an easily tailored and scaleable project management methodology for t...

Erlang Erlang is a general-purpose concurrent, garbage-collected programming language and runtime system. It was designed by Ericsson...

Delivers risk-aware end-to-end user authentication, single sign-on, and authorization protection, enabling enterprises to secure access fro...

Oracle Identity Management enables organizations to effectively manage the end-to-end lifecycle of user identities across all enterprise re...

Delegation is an essential part of a project manager's role, so identifying roles and responsibilities early in a project is important....

Perform Quality Control is when you are trying to find problems in your work products through inspection. Perform Quality Assurance is w...

Motivation The cases when certain objects need to be informed about the changes occured in other objects are frequent. To have a good de...

The Scanner class is a class in java.util, which allows the user to read values of various types Class Constructors There are two const...

What is the difference between procedural and object-oriented programs?  a) In procedural program, programming logic follows certain pro...

What is your biggest weakness? He recommends responding with: “I have a tendency to say yes and get overcommitted.” Then follow that with ...

What is ORM  ? ORM stands for object/relational mapping. ORM is the automated persistence of objects in a Java application to the tabl...