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1.       Clearly distinguish between interrupt and trap. Give examples to illustrate your answer.

2.       Describe time-sharing systems and give an example to illustrate your answer.

3.       Discuss the 4 categories in which work concerning information security and protection relating to Operating Systems are grouped.


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Differences between interrupt and trap

A trap is a signal raised by a user program instructing the operating system to perform some functionality immediately. In contrast, the interrupt is a signal to the CPU emitted by hardware that indicates an event that requires immediate attention.

A trap also triggers OS functionality. It gives control to the trap handler. In contrast, an interrupt triggers the CPU to perform the interrupt handler routine.

A trap is synchronous and usually occurs after the execution of the instruction. In contrast, an interrupt is asynchronous and may occur at any time.

A trap is generated by a user program instruction. In contrast, the hardware devices generate an interrupt.

A trap is also known as a software interrupt, while, an interrupt is known as a hardware interrupt.

An example of a Trap. 

Take for example you are running a program, that needs to print something on the screen, this program will send a signal or request for data to be displayed on the screen, this is an example of a trap, bearing in mind that is it user program based.

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