If another process requests to use resource, the requesting process must be delayed until the resource has been released. Please use ide.geeksforgeeks.org, generate link and share the link here. there must be a fixed number of resources to allocate, resource allocation must be done only once. 3) Ignore the problem altogether: If deadlock is very rare, then let it happen and reboot the system. Pn share m identical resource units, which can be reserved and released one at a time. A similar situation occurs in operating systems when there are two or more processes that hold some resources and wait for resources held by other(s). 4) For a deadlock to arise, which of the following conditions must hold simultaneously? (True / False) (c) Deadlocks cannot arise without semaphores. Question 16. consider a system with m resources of same type being shared by n processes. At a time only one process can use the resource. Question 1 Are each of the following statements True or False? in advance processes rarely know that how much resource they will need, the number of processes changes as time progresses. For Mutual exclusion to prevail in the system : a) at least one resource must be held in a non sharable mode. Multiple choice questions on Operating System topic Deadlocks. ( choose all that apply ) a) Mutual exclusion b) Starvation c) Hold and wait d) No preemption e) Circular wait. It means a resource is non-sharable. Avoidance is kind of futuristic in nature. a) Mutual exclusion b) No preemption c) Hold and wait d) All of the mentioned. (a) In multiprogramming, it is safe to have an arbitrary number of threads/ processes reading a piece of data at once. Exercise:   1) Suppose n processes, P1, …. b. 7 C. 8 D. 9 Discuss Nielit Scientist-B CS 22-07-2017 Operating-Systems Deadlock. Briefly explain process management in Windows 2000. For example, in the below diagram, Process 1 is holding Resource 1 and waiting for resource 2 which is acquired by process 2, and process 2 is waiting for resource 1. Which one of the following is a visual ( mathematical ) way to determine the deadlock occurrence? Circle the correct answer. Hold and wait. We use Banker’s algorithm (Which is in-turn a gift from Dijkstra) in order to avoid deadlock. A deadlock can arise if the following 4 conditions hold simultaneously in a system; Mutual exclusion: At least one resource is held in a non-sharable mode. 3. This GATE exam includes questions from previous year GATE papers. Which one of the following is a sufficient condition for ensuring that deadlock does not occur? By using strategy of “Avoidance”, we have to make an assumption. 2) Deadlock detection and recovery: Let deadlock occur, then do preemption to handle it once occurred. Practice test for UGC NET Computer Science Paper. For effective operating system, when to check for deadlock? A deadlock situation can arise if which of the following conditions hold simultaneously in a system: Mutual exclusion; Hold and wait; No preemption; All of the above ; 2. The maximum resource requirement of process Pi is Si, where Si > 0. Circular Wait: A set of processes are waiting for each other in circular form. Answer: d Explanation: None. Deadlock is a situation where a set of processes are blocked because each process is holding a resource and waiting for another resource acquired by some other process. Resources can be requested and release by processes only one at a time. 2. hold and wait: there must be a process holding one resource and waiting for another. Which one of the following is the deadlock avoidance algorithm? Attempt a small test to analyze your preparation level. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. 6 B. Questions from Previous year GATE question papers, UGC NET Previous year questions and practice sets. A directory of Objective Type Questions covering all the Computer Science subjects. The disadvantage of invoking the detection algorithm for every req 1) Requests a resource 2) Use the resource 2) Releases the resource. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. Deadlock can exist if and only if 4 conditions hold simultaneously: 1. mutual exclusion: at least one process must be held in a non-sharable mode.

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