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Given the staircase example from the beginning of this chapter, identify the four necessary conditions for...

  1. Given the staircase example from the beginning of this chapter, identify the four

necessary conditions for deadlock and explain whether each one is present, or is not

present, in this case.

  • Mutual exclusion:
  • Resource holding:
  • No preemption:
  • Circular Wait:

For the systems described below, given that all of the devices are of the same type, and using the definitions presented in the discussion of the Banker’s Algorithm, answer these questions:

a. Calculate the number of available devices.

b.   Determine the remaining needs for each job in each system.

c.   Determine whether each system is in a safe state or an unsafe state.

2.   This system has 16 devices

Job No.

Devices Allocated

Maximum Required

Remaining Needs

Job 1

5

8

Job 2

3

9

Job 3

4

8

Job 4

2

5

3. This system has 12 devices.

Job No.

Devices Allocated

Maximum Required

Remaining Needs

Job 1

5

8

Job 2

1

4

Job 3

5

7
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