Interrupt is a hardware mechanism in which, the device notices the CPU that it requires its attention. Interrupt can take place at any time. So when CPU gets an interrupt signal trough the indication interrupt-request line, CPU stops the current process and respond to the interrupt by passing the control to interrupt handler which services device.
In polling is not a hardware mechanism, its a protocol in which CPU steadily checks whether the device needs attention. Wherever device tells process unit that it desires hardware processing, in polling process unit keeps asking the I/O device whether or not it desires CPU processing. The CPU ceaselessly check every and each device hooked up thereto for sleuthing whether or not any device desires hardware attention.
Each device features a command-ready bit that indicates the standing of that device, i.e., whether or not it’s some command to be dead by hardware or not. If command bit is ready one, then it’s some command to be dead else if the bit is zero, then it’s no commands.
Let’s see that the difference between interrupt and polling:
|1.||In interrupt, the device notices the CPU that it requires its attention.||Whereas, in polling, CPU steadily checks whether the device needs attention.|
|2.||An interrupt is not a protocol, its a hardware mechanism.||Whereas it isn’t a hardware mechanism, its a protocol.|
|3.||In interrupt, the device is serviced by interrupt handler.||While in polling, the device is serviced by CPU.|
|4.||Interrupt can take place at any time.||Whereas CPU steadily ballots the device at regular or proper interval.|
|5.||In interrupt, interrupt request line is used as indication for indicating that device requires servicing.||While in polling, Command ready bit is used as indication for indicating that device requires servicing.|
|6.||In interrupts, processor is simply disturbed once any device interrupts it.||On the opposite hand, in polling, processor waste countless processor cycles by repeatedly checking the command-ready little bit of each device.|
Attention reader! Don’t stop learning now. Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready.
- Difference between Hardware Interrupt and Software Interrupt
- Difference between Maskable and Non Maskable Interrupt
- Difference between Programmed and Interrupt Initiated I/O
- Difference between Interrupt and Exception
- Purpose of an Interrupt in Computer Organization
- Difference and Similarities between PHP and C
- Difference between Stop and Wait protocol and Sliding Window protocol
- Similarities and Difference between Java and C++
- Difference between Yaacomo and and XAP
- Difference between VoIP and and POTS
- Difference between ++*p, *p++ and *++p
- Difference Between DOS and Windows
- Difference between User Level thread and Kernel Level thread
- What’s difference between The Internet and The Web ?
- Difference between Priority Inversion and Priority Inheritance
- What’s difference between Linux and Android ?
- What’s difference between header files "stdio.h" and "stdlib.h" ?
- Difference between HTML and HTTP
- Difference between http:// and https://
- What's difference between MMU and MPU?
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.