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Interrupt handlers have a multitude of functions, which vary based on what triggered the interrupt and the speed at which the interrupt handler completes its task. For example, pressing a key on a computer keyboard , [ 1 ] or moving the mouse , triggers interrupts that call interrupt handlers which read the key, or the mouse's position, and ...
An interrupt tells a thread that it should stop what it is doing and do something else. A thread sends an interrupt by invoking interrupt() on the Thread object for the thread to be interrupted. The interrupt mechanism is implemented using an internal boolean flag known as the "interrupted status". [8] Invoking interrupt() sets this flag. [9]
For interrupts, a program called an interrupt handler is installed, and it is the interrupt handler that handles the interrupt from the disk. When an interrupt occurs, the hardware automatically switches a part of the context (at least enough to allow the handler to return to the interrupted code).
A hardware interrupt is a condition related to the state of the hardware that may be signaled by an external hardware device, e.g., an interrupt request (IRQ) line on a PC, or detected by devices embedded in processor logic (e.g., the CPU timer in IBM System/370), to communicate that the device needs attention from the operating system (OS) [7] or, if there is no OS, from the bare metal ...
Even when synchronous handling appears to block execution, the underlying mechanism in many systems is still asynchronous, managed by the event loop. [1] [2] Events can be implemented through various mechanisms such as callbacks, message objects, signals, or interrupts, and events themselves are distinct from the implementation mechanisms used.
A reentrant interrupt handler is an interrupt handler that re-enables interrupts early in the interrupt handler. This may reduce interrupt latency. [6] In general, while programming interrupt service routines, it is recommended to re-enable interrupts as soon as possible in the interrupt handler. This practice helps to avoid losing interrupts. [7]
Exceptions are defined by different layers of a computer system, and the typical layers are CPU-defined interrupts, operating system (OS)-defined signals, programming language-defined exceptions. Each layer requires different ways of exception handling although they may be interrelated, e.g. a CPU interrupt could be turned into an OS signal.
The interrupt handler for all those vectors is the same. It will "unpack" the address from the three-and-a-half byte notation, look up the absolute address of the segment, and forward the call, after having done its virtual memory loading thing...