Topic is Operating Systems.

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he he QUESTION 6 In deadlock detection strategies, OA. processes are restricted access to resources. OB. process behavior is unrestricted. oc. the kernel periodically checks for deadlock. OD. if deadlock exists, the kernel may successively abort processes. Hint: a detection strategy does not restrict access since the goal is not to prevent deadlock; an integrated approach means applying a different strategy as the situation demands is generally the best approach. QUESTION 7 The Dining Philosophers Problem demonstrates the condition of CA. hold & wait. CB. no preemption. OC. mutual exclusion. OD. circular wait. Hint: circular wait is occurs when each process is waiting for a resource held by its neighbor a directed graph with a cycle); mutual exclusion, holdawait, and no premption are always present when you have deadlock. QUESTIONS A kernel that uses an integrated deadlock strategy will CA. use the same algorithm for all resources. OB. group resources into a number of different resource classes. oc. probably use a linear ordering strategy to prevent circular wait. OD. use the most appropriate algorithm for a particular resource. Hint: integrated approach attempts to use the strengths of the various strategies for dealing with deadlock. QUESTIONS Which of the following are consumable resources? OA. a UNIX pipe OB. a semaphore OC. memory OD. a Sysv message queue Hint: a consumable resource disappears after use - semaphores operations are lost if not accessed at the right time. QUESTION 10 A deadlock prevention strategy CA. is a conservative rather than a liberal approach. OB. will involve limiting access to resources. cc. will involve imposing restrictions on processes. OD. often involves aborting a process to recover from deadlock. Hint: preventing something from occurring is more restrictive than fixing it after it has occurred; if the strategy works you will never need to abort a process since deadlock will never occur. thek