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…
A pointer is a special type of data type. Instead of storing data, it stores a memory location. At this location is the data. In some languages, like C/C++, they expect the programmer to track and maintain the pointer information, using special references to know if they are storing/retrieving a location for data, or accessing…
A lot of native data types of date/time, numeric, and string fields don’t work when you try to model a lot of real world situations. They are good for a portion of the information, but not all. For example, if I wanted to store information about a player in a computer game, no one of…
A process creation hierarchy is a graphical representation of the dynamically changing parent-child relationships among all processes. The process creation hierarchy changes each time a process is created or destroyed. When a process initiates the creation of a child process, the OS executes a create process function. The create process function allocates a new PCB, fills the PCB entries…
CPU_state – When the process is stopped, the current state of the CPU, consisting of various hardware registers and flags, is saved in this field to be reloaded when the process resumes. PCB Data Description Data Stored As Can Change process_state This is the state of the process, running, ready, or blocked most often. Integer…
