A real-time process is characterized by continual input, which must be processed fast enough to generate nearly instantaneous output. Each arriving input item is subject to a deadline. Ex: Streaming of audio or video, processing and displaying radar data, control of robots or of fly-by-wire aircraft. A period is a time interval (typically in milliseconds or even microseconds for…
There are three major components of Object Oriented Languages. To be truly Object Oriented, you must have all three of these components to make up your language. Encapsulation The protection of data is a very important aspect of object oriented programming. Encapsulation is the idea that we protect and contain the data for our object….
An interactive process communicates with the user by receiving commands or data from the keyboard or a pointing device and responding by generating output to an output device. (monitor, printer, etc) A time quantum, Q, is a small amount of time (typically 10 to 100 milliseconds) during which a process is allowed to use the CPU. The round-robin (RR)…
A batch process performs a long-running and generally repetitive task that does not require any intervention from the user. Ex: Payroll, insurance claims processing, weather prediction, scientific calculations. These are typically run on a server and not a desktop user machine. The FIFO (First-In-First-Out) algorithm, also known as FCFS (First-Come-First-Serve), schedules processes strictly according to the process arrival…
Long-term scheduling decides when a process should enter the ready state and start competing for the CPU. It also manages those which are suspended, to acknowledge when they are ready to move to the ready list. Short-term scheduling decides which of the ready processes should run next on the CPU. Most processes move because of the short…
Object Oriented Programming is about more than just storing custom data types. It is a whole methodology about thinking of how a real life object behaves. What information makes it up and how can it be used within the application. It is about storing data in a manner that is protected from other similar collections…
An application implemented as a single process follows a single path of execution through the program. Most (All) applications you’ve written at this point are single process applications. When a process is blocked by a resource, then the whole process is blocked. However, many applications have other parts of the application that could continue to…
The OS has to track resources so that it knows when those resources are available for use. If it “just let” processes use resources, they could step on the resources and crash the system as a resource can only be used by a single process at a time. So the OS uses an Resource Control…
