Instructor's Manual for Operating System Concepts by Abraham Silberschatz, Peter B. Galvin, Greg Gagne

By Abraham Silberschatz, Peter B. Galvin, Greg Gagne

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The agent then puts out another two of the three ingredients, and the cycle repeats. Write a program to synchronize the agent and the smokers. Answer: Please refer to the supporting Web site for source code solution. 10 Demonstrate that monitors, conditional critical regions, and semaphores are all equivalent, insofar as the same types of synchronization problems can be implemented with them. Answer: No answer. 11 Write a bounded-buffer monitor in which the buffers (portions) are embedded within the monitor itself.

This implies that each process is holding one resource and is waiting for one more. Since there are three processes and four resources, one process must be able to obtain two resources. This process requires no more resources and, therefore it will return its resources when done. 8 Consider a system consisting of m resources of the same type, being shared by n processes. Resources can be requested and released by processes only one at a time. Show that the system is deadlock-free if the following two conditions hold: a.

Maintain a file reference list (or counter), deleting the file only after all links or references to that file have been deleted. 2 Some systems automatically delete all user files when a user logs off or a job terminates, unless the user explicitly requests that they be kept; other systems keep all files unless the user explicitly deletes them. Discuss the relative merits of each approach. Answer: Deleting all files not specifically saved by the user has the advantage of minimizing the file space needed for each user by not saving unwanted or unnecessary files.

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