The software solution presented before only works if there is two processes competing for the same code block. Likewise, it is not real efficient if it needs to be used a lot. Semaphores are general-purpose primitives that allow solving a variety of synchronization problems in a systematic manner. A semaphore is a non-negative integer variable that…
Concurrency is when multiple processes (or threads) execute at the same time. When multiple physical CPUs are available, the processes may execute in parallel. On a single CPU, concurrency may be achieved by time-sharing. There is a whole study in the process of parallel programming, where you design applications to run on multiple processors simultaneously to…
Constructors Most Classes are meant to be instantiated as an Object. This means that it has its own unique data attributes and methods to access and control them. When created, a constructor should set up the class, but do the bare minimum amount of work outside of setting up initial values. This is for performance…
If you work with a system that only has batch processes, or only does real time applications, then your scheduling algorithm selection is much easier. You pick an appropriate choice and go with it… However, the modern desktop OS will often include a combination of batch, interactive, and real-time applications. Therefore picking “a” solution isn’t…
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…
