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Which of the following can carry information and control task?

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Which of the following can carry information and control task?

(a) semaphore

(b) messages

(c) flags

(d) address message

The question was posed to me in unit test.

I'm obligated to ask this question of Multitasking Operating Systems in chapter Real Time Operating systems of Embedded Systems

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The correct option is (b) messages

Explanation: The messages can carry information and it can also control the task regarding the real-time operating systems. These are also known as events.

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