Table of Contents
How does CPU respond to multiple interrupts?
Multiple interrupt requests require a mechanism to handle each interrupt. Two or more interrupts requests may also be received simultaneously. Moreover, a new interrupt may be received by the processor while an earlier interrupt is being handled.
How are interrupts handled by the CPU?
Most modern general purpose microprocessors handle the interrupts the same way. When a hardware interrupt occurs the CPU stops executing the instructions that it was executing and jumps to a location in memory which either contains the interrupt handling code or an instruction branching to the interrupt handling code.
How do interrupts handle multiple devices?
Handling Multiple Devices: When more than one device raises an interrupt request signal, then additional information is needed to decide which device to be considered first. The following methods are used to decide which device to select: Polling, Vectored Interrupts, and Interrupt Nesting.
How does the processor handle two or more simultaneous interrupt requests?
Suppose a system can handle multiple interrupts and when the multiple interrupts occurs, the system prioritize as to which one to serve first. If there is only “single interrupter” and when multiple interrupt occurs, then it will have certain external controller to handle it.
How interrupt occur and how they are handled?
An operating system usually has some code that is called an interrupt handler. The interrupt handler prioritizes the interrupts and saves them in a queue if more than one is waiting to be handled. A software interrupt occurs when an application program terminates or requests certain services from the operating system.
What are the conditions for CPU to respond to interrupt?
If any device has interrupt signal in low level state then interrupt line goes to low level state and enables the interrupt input in the CPU. When there is no interrupt the interrupt line stays in high level state. The CPU respond to the interrupt by enabling the interrupt acknowledge line.
What causes a hardware interrupt of the CPU?
For example, pressing a keyboard key or moving a mouse plugged into a PS/2 port triggers hardware interrupts that cause the processor to read the keystroke or mouse position. Hardware interrupts can arrive asynchronously with respect to the processor clock, and at any time during instruction execution.