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Which mechanism can control the access?

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Which mechanism can control the access?

(a) in-situ

(b) spin-lock

(c) ex-situ

(d) both in-situ and ex-situ

I had been asked this question in exam.

Question is taken from Resource Protection topic in division Real Time Operating systems of Embedded Systems

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Best answer
Right answer is (b) spin-lock

To elaborate: Both the memory and the hardware part are protected by the memory management unit and the hardware such as the input-output devices are protected, These are prevented from the direct access. These accesses are made through a device driver and this device driver can control the serial port. Such a mechanism is called spin-lock mechanism which provides the control access.

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