How are interrupts used in the real world?
Interrupts are a much more efficient way of handling the “wait for something to happen and react immediately when it does” situation. They free up the resources you would have wasted on polling, so that you can use them for something else.
Why do you use interrupts in a program?
Interrupts are a much more efficient way of handling the “wait for something to happen and react immediately when it does” situation. They free up the resources you would have wasted on polling, so that you can use them for something else. Then, when the event happens, the rest of your program is “interrupted” and your chosen outcome occurs.
Why are interrupts good in the collection office?
You now know you will not miss that knock on the door and end up with one of those “we tried to deliver your item but you were out and the collection office is closed for the next two days, so enjoy the wait” cards. So interrupts are good, as you can set them up to wait for events to occur without wasting system resources.
What happens to the Weather Radio during an emergency?
During an emergency, National Weather Service forecasters will interrupt routine weather radio programming and send out special tones that activates the Weather Radios in the listening area.
What happens to the CPU when an interrupt occurs?
Your CPU is chugging along merrily, and then BAM – an interrupt occurs. Whatever your CPU was doing is, well, interrupted, and the CPU branches off to do some other, ostensibly important, function. When that important function is complete, the interrupt is released (or cleared), and your CPU goes back to what it was doing, right where it left off.
Can a ham break in on an occupied frequency?
The only exception to the rule is emergency traffic. You can break in on an occupied frequency if you have a bonafide emergency. By that same token, if someone breaks in on your conversation with an emergency, they have the “right-of-way”. In fact, as a responsible ham, you should do everything you can to help the person out.
What’s the difference between internal and external interrupts?
Internal interrupts are generated by the CPU hardware itself, or commanded by software. External interrupts are those caused by peripheral devices. These types of interrupts are non-deterministic – they can occur at any time relative to anything else occurring in the CPU. (As an example, consider the input from a keyboard.