What is a trap instruction? explain its use in operating systems.

In operating system,trap instruction is synchronous interrupt which arises due to occurrence of exceptional conditions.

Explanation:Trap instructions are the synchronous interrupt or exception . It may arise due to reasons like invalid memory access ,term division by zero etc. Trap instruction is a software invoked interrupt and it is type of a call which transfers the control synchronously. It is also a way of switching into the Kernel mode in which the operating system take some steps before returning the control to the main process  .

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