The mechanism by which the CPU is interrupted from its current task to handle an event is called an:

Question

BlackTom AI · Accepted Answer

The question asks for the mechanism by which the CPU is interrupted from its current task to handle an event.
Option a: Trap. A trap is a kind of software interrupt triggered by a user-space or privileged instruction to transfer control to the OS, often for system calls or error handling. It is related but not the general term for the CPU being interrupted by events, so this choice is not the best overall description.
Option b: Context Switch. A context switch is the process of saving the state of the current task and loading the state of another task. It describes the scheduling action after an interrupt, not the interrupt itself as the mechanism that causes the CPU to hand control to the OS in response to an event.
Option c: Interrupt. An interrupt is the hardware or software signal that causes the CPU to suspend its current task and service a higher-priority event, transferring control to an interrupt handler. This matches the described mechanism directly.
Option d: System Call. A system call is a explicit request from a user program to the operating system to perform a privileged operation. It is initiated by software in the program, not the generic mechanism by which the CPU is interrupted to handle asynchronous events.
In summary, traps and system calls are specific types of control transfers, while a context switch describes the scheduling after an interrupt. The broad mechanism described in the question corresponds to an interrupt, which preempts the current execution to address the event.

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