Consider the following resource allocation graph and check whether it contains deadlock or not? Justify your answer in detail.

1- Consider the following resource allocation graph and check whether it contains deadlock or not? Justify your answer in detail.

R1 R3 P P2 (P3 , R2 R4

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2- Consider the following page reference string:

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4, 6, 7, 8, 6, 7, 8, 4, 6, 4, 4, 7, 5, 8

Assuming demand paging with three frames, how many page faults would occur for the following replacement algorithms? illustrate your work.

  1. FIFO replacement.
  2. LRU replacement.

3- What is swapping? explain the terms “swap in” and “swap out” with a neat diagram. Explain under which circumstances page faults occur and how they are resolved by the operating system.

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