Deadlock Recovery in Operating Systems

<p>User preference for process completion (B)</p> Signup and view all the answers

<p>P1 acquires <code>s1</code> while P2 simultaneously acquires <code>s2</code>, and both then wait for the other (A)</p> Signup and view all the answers

<p>Minimize the cost of aborting processes (A)</p> Signup and view all the answers

<p>Starvation of the selected process (D)</p> Signup and view all the answers

<p>First-come first-served resource allocation (A)</p> Signup and view all the answers

<p>Return to a previously safe state (B)</p> Signup and view all the answers

<p>Any entity that a process can request, use, and release such as CPU cycles, memory space or I/O devices (B)</p> Signup and view all the answers

<p>Preemption (C)</p> Signup and view all the answers

<p>Multiple instances may reduce the likelihood of a deadlock but do not eliminate it. (B)</p> Signup and view all the answers

<p>The process is requesting an instance of the resource (C)</p> Signup and view all the answers

<p>Both <code>S1</code> and <code>S2</code> are initialized to 1. (D)</p> Signup and view all the answers

<p>There is only one instance of each resource type (A)</p> Signup and view all the answers

<p>P1 executes <code>wait(s1)</code> THEN <code>wait(s2)</code> and P2 executes <code>wait(s2)</code> THEN <code>wait(s1)</code>. (D)</p> Signup and view all the answers

<p>A resource can only be released voluntarily by the process holding it once the process has completed its task (D)</p> Signup and view all the answers

<p>Deadlock is impossible (A)</p> Signup and view all the answers

<p>Deadlock creation (C)</p> Signup and view all the answers

<p>A process is holding at least one resource while waiting to acquire additional resources held by other processes. (A)</p> Signup and view all the answers

<p>A directed edge from a process to a resource (C)</p> Signup and view all the answers

<p>Only one process can use a resource at a time. (C)</p> Signup and view all the answers

<p>Each process is waiting for a resource held directly by the next process in the chain, and the last process waits for the first one. (C)</p> Signup and view all the answers

<p>A process may request a resource in the future. (C)</p> Signup and view all the answers

<p>If the request does not create a cycle in the resource allocation graph. (B)</p> Signup and view all the answers

<p>It requires each process to claim maximum resources in advance. (D)</p> Signup and view all the answers

<p>It converts to a claim edge. (D)</p> Signup and view all the answers

<p>A request can lead to potential deadlock in the future. (B)</p> Signup and view all the answers

<p>They must return them in a finite time. (A)</p> Signup and view all the answers

<p>Resources must be claimed a priori by processes. (C)</p> Signup and view all the answers

<p>It can help ensure the system remains in a safe state. (D)</p> Signup and view all the answers

<p>The instances of each resource type currently allocated to the process. (B)</p> Signup and view all the answers

<p>By subtracting Allocation from Max matrices. (B)</p> Signup and view all the answers

<p>The requested resources must be less than available resources. (A)</p> Signup and view all the answers

<p>The sequence &lt; P1, P3, P4, P2, P0&gt; maintains safety criteria. (C)</p> Signup and view all the answers

<p>Whether the request is less than the Available resources. (A)</p> Signup and view all the answers

<p>There exists at least one sequence of process execution that avoids deadlock. (B)</p> Signup and view all the answers

<p>One or more processes are permanently blocked, waiting for resources held by others. (C)</p> Signup and view all the answers

<p>The instances of each resource type that are still free and can be allocated. (C)</p> Signup and view all the answers

<p>Mutual Exclusion (D)</p> Signup and view all the answers

<p>Processes must not hold any resources when requesting new ones. (C)</p> Signup and view all the answers

<p>All resources of a process are released if the process requests unallocatable resources. (C)</p> Signup and view all the answers

<p>Imposing a total ordering of all resource types. (B)</p> Signup and view all the answers

<p>Processes must declare the maximum number of resources they may need. (D)</p> Signup and view all the answers

<p>There exists a sequence of processes fulfilling their resource needs. (B)</p> Signup and view all the answers

<p>Safe states ensure the system avoids deadlocks. (D)</p> Signup and view all the answers

<p>Deadlocks may potentially arise. (D)</p> Signup and view all the answers

<p>All currently held resources by that process are released. (C)</p> Signup and view all the answers

<p>Starvation of processes may occur. (A)</p> Signup and view all the answers

A situation where processes cannot proceed because each is waiting for a resource held by another.

Mechanisms used to ensure that only one process can access a resource at a time.

Conditions that must hold for deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait.

A directed graph that represents processes and resources in a system.

Techniques used to prevent one or more of the four necessary conditions from being true.

An algorithm that allocates resources to processes while avoiding deadlock.

The process of identifying deadlocks in a system.

Strategies for handling a detected deadlock, such as process termination or resource preemption.

Indicates that a process may request a resource, represented by a dashed line.

Turns from a claim edge when a process actively requests a resource.

Shows that a resource has been allocated to a process.

A configuration where granting a resource may lead to a deadlock.

Occurs in the resource allocation graph when requests lead to deadlock.

Processes must declare maximum resource claims before execution.

Condition where resources cannot be shared and are exclusively allocated.

Condition requiring processes to not hold resources while requesting others.

Condition allowing resources to be taken from a process when it requests more.

Condition where processes wait in a cycle for resources held by each other.

Strategies to prevent deadlock by ensuring resource requests won't lead to unsafe states.

Defined by the count of available and allocated resources and max demands.

Situation where processes wait indefinitely for resources, getting none.

Algorithm that checks the resource-allocation state at runtime to prevent deadlocks.

The strategy of ending processes to resolve a deadlock situation.

Choosing a process to abort in a deadlock recovery strategy.

Forcing a process to give up resources to resolve deadlock.

Returning a process to a safe state to recover from deadlock.

Vector indicating instances of each resource type available.

Matrix showing maximum resource instances a process may request.

Matrix that displays currently allocated resource instances to processes.

Matrix showing the remaining resource instances a process requires to finish.

Process of verifying if a resource request is less than or equal to Available.

Algorithm that determines if a system can be in a safe state after a resource request.

Individual execution of a process that interacts with resources.

Category of resource available in the system (e.g., CPU, Memory).

A situation where processes are stuck waiting for each other indefinitely.

If the resource graph has cycles, deadlock may ensue.