Interrupts - event driven devices, Computer Graphics

Assignment Help:

Interrupts - Event driven devices

Interrupts: An option to polling is the interrupt feature. The device sends an interrupt signal to the processor while an event happens. The processor breaks from its usual execution and executes several special interrupt-handling routine or task.

After complete the task, the control returns to the important program. To handle conditions while more than one event happens, various priorities are allocated to tasks hence higher priorities tasks may interrupt tasks of lower priority.

Some events may arise before the program is prepared for them. While more than one event occurs, the relate information is entered in the event queue. A polling loop can be utilized to check the status of the event queue. The event queue can after that pass input data from the polling task to the main program in the accurate order. The main program takes events off the head of the queue and raises the suitable process. The devices require not be checked frequently for occurrence of events. Such devices can interrupt although the processor being unaware of this.

Two types of light pen interrupts may arise. If the user points that pen at an item upon the screen to choose it, as in figure (a) of Light Pen Application, a selection interrupt arises. If the user is positioning along with the pen, as in figure (b) of Light Pen Application, a pattern termed as tracking pattern in displayed along the pen's tracking interrupts and movement arise when the pen observes the tracking pattern.

Modified versions of the light pen may also be utilized to draw lines, read barcodes or perform transformation operations on things on a tablet or on the screens.

 


Related Discussions:- Interrupts - event driven devices

Utility purpose of display processor in the graphic system, Explain the uti...

Explain the utility and purpose of display processor in the graphic system.  The purpose of the display processor is to free the CPU from the graphics chores. A major task of the d

Poser - software to generate computer animations, Poser - software to gener...

Poser - software to generate computer animations Poser: Poser through Curious Labs Creates 3-dimentaional complex models which you can view from any angle, distance o

Alias wavefront - softwares for computer animation, Alias Wavefront - Softw...

Alias Wavefront - Softwares for Computer Animation Alias is one of the highest computer animation packages out there. Alias was formed by the company which used to be Alias, a

Is cad only helpful for design drawings, Question: Is CAD only helpful for ...

Question: Is CAD only helpful for design drawings? No. When true-scale, structurally valid drawings are the purpose for CAD's existence; it utilizes is as diverse as imagination

Interactive picture construction techniques, Explain the interactive pictur...

Explain the interactive picture construction techniques.    interactive picture- construction methods are commonly used in variety of applications, including design and painting pa

Behavioral animation - computer animation, Behavioral Animation - Computer ...

Behavioral Animation - Computer Animation It used for control the motion of several objects automatically. Objects or "actors" are specified rules about how they respond to th

Time based and presentation tools, Time Based and Presentation Tools In...

Time Based and Presentation Tools In such authoring systems, components and events are organized beside a timeline, along with resolutions as high as 1/30 second. Time based to

Write a c-code that plots an object on the window, Write a C-code that plot...

Write a C-code that plots an object on the window and on the user's click of mouse on the window, the object starts rotating continuously until the user presses the mouse again.

Find out the matrix of projection, Find out the matrix of projection for ca...

Find out the matrix of projection for cavalier projection Answer: Cavalier projection corresponds to tan α = 1, leading to the following matrix.

Graphical User interface and interactive input methods, all details of Grap...

all details of Graphical User interface and interactive input methods

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd