Select all of the following statements that are true Deadlocks are desirable in a system of processes In order for a process to be able to return to a previous state, at least one checkpoint/snapshot of a safe process state is needed. 0 A wait-for graph can be constructed from a resource allocation graph by eliminating the resource nodes and collapsing the associated edges. A forced termination of one process to recover from a deadlock never has any side effects on other processes running in the system. One sign of a deadlock is that many processes are waiting, although the CPU is not busy. At the start of the banker's algorithm, "Work" refers to the actually available system resources.

Select all of the following statements that are true Deadlocks are desirable in a system of processes In order for a process to be able to return to a previous state, at least one checkpoint/snapshot of a safe process state is needed. 0 A wait-for graph can be constructed from a resource allocation graph by eliminating the resource nodes and collapsing the associated edges. A forced termination of one process to recover from a deadlock never has any side effects on other processes running in the system. One sign of a deadlock is that many processes are waiting, although the CPU is not busy. At the start of the banker's algorithm, "Work" refers to the actually available system resources.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Deadlock detection and recovery: Select all of the following statements that are true. A wait-for graph can be constructed from a resource allocation graph by eliminating the resources and collapsing the associated edges. A forced termination of one process to recover from a deadlock never has any side effects on other processes running in the system. In order for a process to be able to return to a previous state, at least one checkpoint of a safe process state is needed. Deadlock detection must be carried out after every resource allocation which cannot be immediately granted. At the start of the banker's algorithm, "Work" refers to the actually available system resources. One sign of a deadlock is that many processes are waiting, although the CPU is not busy.
A deadlock occurs when a group of processes is stalled because one process is holding a resource and waiting for another process to obtain it. Consider the situation when two trains are approaching each other on the same track and there is only one track: once they are in front of each other, neither train can proceed. In operating systems, a similar scenario happens when two or more processes possess certain resources while waiting on resources owned by other processes (s). In the picture below, Process 1 is holding Resource 1 and waiting for Process 2 to acquire Resource 2, while Process 2 is waiting for Resource 1. Give an example of a realistic deadlock avoidance approach and describe the basic strategy behind it.
Draw a resource allocation graph for the following processes and resources. There are four processes running (P1, P2, P3 and P4) and four resources each with single instance (R1, R2, R3 and R4). P1 is holding R4 and requesting R2. P2 is holding R3 and requesting R4. P3 is holding R2 and requesting R1. P4 is holing R1. Is it a deadlock situation?
Draw and explain the queuing model of the following figure, for single blocked queue and for a multiple blocked queue. Furthermore, show how does a running process is removed from the execution, it is either terminated or placed in the Ready or Blocked queue, n the circumstances.
Deadlock avoidance: Select all of the following statements that are true. Deadlock avoidance aims to ensure that a system of processes will never enter an unsafe state. Claim edges in resource allocation graphs indicate resource requests that a process may send out in the future. The banker's algorithm can only be applied when there are single units of each resource type only. In order for the banker's algorithm to be applicable, when a process starts up, it must state in advance the maximum number of resources it may request. After the execution of the banker's algorithm, if Finish[i] == false for all processes i, then the system is in a safe state. Unsafe system states can lead to deadlocks.
When a process holds an allocated resource and it cannot be taken away, what condition of a deadlocked state does this create? mutual exclusion no preemption hold and wait none are correct circular wait
A process may be blocked and located into the corresponding event queue due to waiting for an event of a specific type, however it recommends thata process be able to only in one event queue at a time as illustrated in the following figure. Ready Queue Release Admit Dispatch Processor Timeout Event 1 Queue Event 1 Оссurs Event 1 Wait Event 2 Queue Event 2 Occurs Event 2 Wait Event n Queue Event n Wait Event n Occurs a) Give an example in which you can demonstrate how to allow a process to wait for more than one event at the same time. b) In that circumstance, by what meanstransform the queuing structure of the figure to support new feature? Provide the definition of the structures in C/C++ with example.
Using a resource allocation graph, show the possibility of a deadlock in this implementation. Modify the order of some of the get requests to prevent the possibility of any deadlock. Is it possible that a resource deadlock involves multiple units of one type and a single unit of another? If so, give an example.
Concurrent Processes / Monitors select which is true options: a CV (condition variable) queues in a monitor store suspended processes waiting on the corresponding condition. b The "Signal and Wait" approach (Hoare semantics) leads to more efficient implementation and reduces the number of context switches. c Two or more processes can be active in the same monitor simultaneously. d When the "Signal and Continue"-approach (Mesa semantics) is applied, the signaling process P continues executing. e The monitor-based solution to the Dining-Philosophers problem discussed in class is restricted to 5 philosophers.
Assume a binary semaphore variable, S is initialized to 1. The semaphore operations flow which is wait (S) – critical section – signal (S) has been changed. The new flow is omits the wait (S), or the signal (S), or both. What will happened in this situation? Select one: a.several processes maybe executing in their critical section b.either mutual exclusion is violated or a deadlock will occur. c.processes will starve to enter critical section
A system has three processes (P1,P2, P3) and three resources (R1,R2, R3). There is one instance of R1 and R2. There are three instances of R3. P1 holds an R1 and is requesting an R3. P2 holds an R3 and is requesting an R1. P3 holds two instances of R3 and an R2. Does a deadlock exist? Justify your answer.
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