There are two ways that computer programs can receive input from a user: polling and interrupts. Polling is the process of repeatedly asking for input, while interrupts are requests for input that cause the program to stop what it is doing and attend to the new input. Each method has its own advantages and disadvantages.
What is Polling ?
Polling is the process of collecting information from a group of people, usually through a survey. It is used to gauge public opinion on a variety of issues, from politics to popular culture.
There are different types of polling, including opinion polls, exit polls and approval ratings. Opinion polls are the most common type of poll, and involve asking people their views on a particular issue or candidate. Exit polls are conducted after an election, in order to determine how people voted. Approval ratings measure how well a leader or institution is doing, by asking people if they approve or disapprove of their performance.
Polling can be used to predict election results, as well as to gauge public opinion on important issues. It is an important tool for democracy, allowing people to have their say on the issues that matter to them.
What is Interrupt?
An interrupt is a signal from a device, such as a keyboard or mouse, that tells the computer to stop what it is doing and do something else. The computer can then resume its original task after the interrupt has been serviced.
Interrupts can be generated by hardware devices or software programs. Hardware interrupts are generated by devices such as the keyboard or mouse, while software interrupts are generated by programs.
Interrupts are used to handle events that occur during the execution of a program. For example, if a key is pressed on the keyboard, an interrupt can be generated to tell the program to read the key and take appropriate action.
Main differences between Polling and Interrupt
There are two main types of computer input: polling and interrupts. Polling is the process of constantly checking for new input, while interrupts are notifications sent to the processor that new input is available. Interrupts are generally faster than polling, but they can cause problems if not properly managed.
One of the biggest differences between polling and interrupts is how they handle multiple inputs. With polling, each input must be checked in turn and this can lead to delays if there are a lot of inputs. Interrupts, on the other hand, can handle multiple inputs simultaneously which makes them much faster.
Another difference between these two types of input is that interrupts can be processed in the background while polling must be done in the foreground. This means that interrupts can be used to do things like start a new task without interrupting the current one, while polling can’t.
Similar Frequently Asked Questions (FAQ)
What are some disadvantages of polling?
There are two types of data acquisition systems – polling and interrupt. Both have their advantages and disadvantages, which should be considered when choosing a system.
Polling systems continuously check for new data, while interrupt systems only check for new data when they are signaled that there is new data available. This can make interrupt systems more efficient, as they are not wasting time constantly checking for new data when there is none. However, this also means that if the system misses the signal that there is new data available, it will never know to check for it.
Another disadvantage of polling systems is that they can introduce jitter into the system. Jitter is variation in the timing of events, and can cause problems with real-time applications such as audio or video playback.
In conclusion,it is important to understand the difference between polling and interrupt when working with computers. Polling is a process where the computer checks for input at regular intervals, while interrupt is a process where the computer is notified immediately when there is input. Interrupt is generally preferred over polling, as it is more efficient and can prevent issues such as data loss.
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