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Polling checks constantly the status of de I/O device, wasting CPU cycles. However with Interrupt driven I/O the device sends a request to the CPU to indicate that it needs attention.
So, in some cases, Interrupt driven I/O will be better than polling, because doesn't waste CPU cycles checking when the device needs attention.
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What did IO Carter invent?
Nursery Chair .
How do the IO facilities in C plus plus differ from those in C?
The C standard library IO facilities are not extensible. For instance, the printf() and scanf() functions cannot handle user-defined types. However, the C++ standard library provides IO streams with insertion and extraction operators (<< and >>) that can be overloaded to support any user-defined type.
What is DMA in 8085 in microprocessor?
DMA stands for Direct Memory Access, in regards to 8085 MP. It consists of 2 pins, namely, HOLD and HLDA. The former of which indicates the processor that either a peripherial or any IO device, is requesting the processor to hold its current activites and give the control of buses to IO devices. HLDA, on the contrary, is the acknowledgement from the microprocessor to the concerned IO device sending the request.
What is the formula to convert voltage levels to decibels?
Here you find the formula to convert voltage levels to decibels. Scroll down to related links and look at "How to calculate dB?"
What elements make concrete?
Water, Cement, fine aggragate, course aggregate and sometimes add mixtures.
List and briefly define three techniques for IO operations?
programmed i/o interrupt driven i/o direct memory access(DMA)
What is the advantage and disadvantage of interrupt in memory mapped IO?
disadvantages of interrupt
Difference between programmed IO and interrupt IO?
1.Programmed IO is the process of IO instruction written in computer program , where Interrupt Initiated IO is done by using interrupt and some special command. 2.The advantage of Interrupt Initiated IO is ,it is a time consuming process than Programmed IO. 3.In Programmed IO technique to transfer data,required constant motoring on peripheral by CPU,once data transfer is initiated, CPU have to wait for next transfer. In Interrupt Initiated IO once data transfer initiated ,CPU execute next program without wasting time and the interface keep monitoring the device. When the interface determines that the device is ready to transfer data, it generate an interrupt request,CPU stop the current task,execute the transferring process,and then return to the previous on-processing task.
Interrupt driven IO?
Whenever a data transfer to or from the managed hardware might be delayed for any reason, the driver writer should implement buffering. Data buffers help to detach data transmission and reception from the write and read system calls, and overall system performance benefits.A good buffering mechanism leads to interrupt-driven I/O, in which an input buffer is filled at interrupt time and is emptied by processes that read the device; an output buffer is filled by processes that write to the device and is emptied at interrupt time. An example of interrupt-driven output is the implementation of /dev/shortprint.For interrupt-driven data transfer to happen successfully, the hardware should be able to generate interrupts with the following semantics:For input, the device interrupts the processor when new data has arrived and is ready to be retrieved by the system processor. The actual actions to perform depend on whether the device uses I/O ports, memory mapping, or DMA.For output, the device delivers an interrupt either when it is ready to accept new data or to acknowledge a successful data transfer. Memory-mapped and DMA-capable devices usually generate interrupts to tell the system they are done with the buffer.
How do you say it's me in Italian?
Io sono qui better "sono io"
What happens if both CPU and IO devices want to access the bus at the same time?
Maybe you have seen something called an interrupt as you work on your computer. These Interrupt Requests come from processes or devices that want to use resources. It's all very orderly.
Does IO orbit the sun?
There are two objects in the solar system named Io. One is an asteroid which orbits the sun. The better-known Io is a moon that orbits Jupiter.
Does Jupiter's moon io have oxygen?
There is no significant amount of oxygen on Jupiter.
What is 'I really do' when translated from English to Italian?
I do = [Io] faccioI = Io; do = FaccioReally = davvero (as in actually)so you could say "Davvero, [Io] faccio"If you're trying to say it more like "I do, very much":Faccio realmente... you're probably better of with option 1: Davvero, [Io] faccio
What do you mean by polling in single threading in c?
When you are polling for data, you constantly check the variable in a loop of some sort to detect changes. For example: volatile int x = 10; //some other thread will change poll while (x > 5); This is a very simple example of polling. Another thread is suppose to change poll from 10 to something else. In the current thread the above excerpt is running, the while loop constantly "polls" the variable x and the thread will never move on from the while loop. Polling can be used for seen when monitoring sensors, IO streams, and other things. Polling eats up CPU cycles and normally should be avoided in favor of other methods in most cases.
What is IO mapped?
Peripheral-Mapped IO is IO that is selected when the IO/M- line is high.
What does io mean in English?
If you are referring to the Italian word 'Io' which can be used in the sentence 'Io Sono', Io means I. Io sono means I am.
