![]() Rather than using a hard-coded interrupt dispatch table at the hardware level, software interrupts are often implemented at the operating system level as a form of callback function. ![]() Later it was found convenient for software to be able to trigger the same mechanism by means of a software interrupt (a form of synchronous interrupt). In general, hardware interrupts and their handlers are used to handle high-priority conditions that require the interruption of the current code the processor is executing. Hardware interrupts arise from electrical conditions or low-level protocols implemented in digital logic, are usually dispatched via a hard-coded table of interrupt vectors, asynchronously to the normal execution stream (as interrupt masking levels permit), often using a separate stack, and automatically entering into a different execution context (privilege level) for the duration of the interrupt handler's execution. The traditional form of interrupt handler is the hardware interrupt handler. ![]() Interrupt handlers are initiated by hardware interrupts, software interrupt instructions, or software exceptions, and are used for implementing device drivers or transitions between protected modes of operation, such as system calls. In computer systems programming, an interrupt handler, also known as an interrupt service routine or ISR, is a special block of code associated with a specific interrupt condition. JSTOR ( February 2015) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Interrupt handler" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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