b) No preemption View Answer, 2. Pages 44. All Rights Reserved. c) to let a process wait for only one resource at a time Decrease the number of processes. All resources of project management process are important to get the project off the ground and successfully move it in the right direction. If Request [ i ] > Need [ i ] for any process i, raise an error condition. In order to find out the request matrix, you have to go to the process and see the outgoing edges. View Answer, 3. Resources can be requested and released by processes only one at a time. The request and release of resources are ___________ Added to that, they receive an overwhelming number of resource requests on a daily basis. Initialize work [ ] = available [ ] For i = 1,2,...n, if allocation [i] != 0 then // For all n processes finish [i] = false; otherwise, finish [i] = true; 2. d) None of the mentioned d) All of the mentioned request - number of resources of type m requested by process n. Let work and finish be vectors of length m and n respectively. Increase Available (new resources added) - This could safely be changed without any problems. 4. Preparing a proposal. Example: In the above question: 1. View Answer, 10. Application Process. c) there must be at least one resource in a sharable mode a) must exist Justification of Resources . Answer: a. Allocate the resources to the processes one less than the maximum need. ). So, the deadlock has occurred. © 2011-2020 Sanfoundry. Also, when a process gets all its requested resources it must return them in … For sharable resources, mutual exclusion ____________ a) Low CPU utilization 1. initially declared so that this request matrix results. So, process P2 is allocated the requested resources. Now, how do we get the resources back and gain forward. Consider The Case Of M 10 N 12 Which Of The Following Cases Is Deadlock Free? This will be minimum number of resources that are required for deadlock free system. A has 7 instances, B has 2 instances, and C has 6. instances. a) must always be less than the total number of resources available in the system In general, it's easier to preempt the resource, than to terminate the process. b) A process must be holding at least one resource and waiting to acquire additional resources that are being held by other processes a) to ensure that at least one of the necessary conditions cannot hold a) then the process waits for the resources be allocated to it Solution- We have derived above-Maximum number of units of resource R that ensures deadlock = (∑x i – n) Thus, For no deadlock occurrence, 1) The number of resources requested by a process : a) must always be less than the total number of resources available in the system b) must always be equal to the total number of resources available in the system c) must not exceed the total number of resources available in the system Get step-by-step explanations, verified by experts. View Answer, 8. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! What are Multithreaded programs? d) must exceed the total number of resources available in the system This set of Operating System Multiple Choice Questions & Answers (MCQs) focuses on “Deadlock Prevention”. Resources can be requested and released by processes only one at a time. b) each process must request and be allocated all its resources before it begins its execution Reduces process errors. i.e, allocated [Max need - 1] to every process. Prevent one process from always being the one preempted ( starvation ). Write your letter using the “Tell them what you’re going to … View Answer, 5. b) to ensure that all of the necessary conditions do not hold Let n number of processes and m number of resources. a) is required Decrease Available (resource permanently removed from system)- This could have an effect on the system and introduce the possi- … Notes. Then-Available = [ 1 2 2 ] + [ 5 2 0 ] = [ 6 4 2 ] Step-02: With the instances available currently, only the requirement of the process P2 can be satisfied. This preview shows page 20 - 26 out of 26 pages. looks like this: Suppose the Request matrix is changed like this. It completes its execution and then free up the instances of resources held by it. a) Mutual exclusion If Request [ i ] > Available for any process i, then that process must wait for resources to become available. In other words, the maximum amounts to be allocated are. Uploaded By SuperHumanRockJellyfish9164. To ensure no preemption, if a process is holding some resources and requests another resource that cannot be immediately allocated to it ____________ The system is deadlock free if and only if-The sum of all max needs is < m+n; The sum of all max needs is > m+n; Both of above; None of these . b) must not exist a) A process must be not be holding a resource, but waiting for one to be freed, and then request to acquire it c) A process must hold at least one resource and not be waiting to acquire additional resources Sanfoundry Global Education & Learning Series – Operating System. Introducing Textbook Solutions. b) the process keeps sending requests until the resource is allocated to it List all of the costs associated with your request, then list the quantitative and qualitative benefits that granting you the requested resources will provide. Resource Request Process Requesting and Tracking resources in the State of Washington.