Operating Systems: Deadlocks Lecture Quiz
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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

Mutual exclusion: only one ______ at a time can use a resource

process

Hold and wait: a ______ holding at least one resource is waiting to acquire additional resources held by other processes

process

No preemption: a resource can be released only voluntarily by the ______ holding it, after that process has completed its task

<p>process</p> Signup and view all the answers

There exists a set {P0, P1, …, Pn} of waiting processes such that P0 is waiting for a resource that is held by P1, P1 is waiting for a resource that is held by P2, …, Pn–1 is waiting for a resource that is held by Pn, and Pn is waiting for a resource that is held by P0.

<p>Circular wait</p> Signup and view all the answers

the ______ consists of resources

<p>System</p> Signup and view all the answers

Each resource type Ri has Wi instances. Each process utilizes a resource as follows: request use ______

<p>release</p> Signup and view all the answers

Deadlock can arise if four conditions hold simultaneously. Mutual exclusion: only one process at a time can use a ______

<p>resource</p> Signup and view all the answers

A process holding at least one resource is waiting to acquire additional resources held by other ______

<p>processes</p> Signup and view all the answers

There exists a set {P0, P1, …, Pn} of waiting processes such that P0 is waiting for a resource that is held by P1, P1 is waiting for a resource that is held by P2, …, Pn–1 is waiting for a resource that is held by Pn, and Pn is waiting for a resource that is held by P0

<p>[blank]</p> Signup and view all the answers

Circular wait

<p>[blank]</p> Signup and view all the answers

Study Notes

Deadlock Conditions

  • Deadlock occurs when a set of processes are blocked because each process is holding a resource and waiting for another resource acquired by some other process.
  • Four necessary conditions for deadlock to arise: mutual exclusion, hold and wait, no preemption, and circular wait.

Mutual Exclusion

  • Only one process at a time can use a resource.

Hold and Wait

  • A process holding at least one resource is waiting to acquire additional resources held by other processes.

No Preemption

  • A resource can be released only voluntarily by the process holding it, after that process has completed its task.

Circular Wait

  • A set of waiting processes exists where P0 is waiting for a resource held by P1, P1 is waiting for a resource held by P2, ..., Pn–1 is waiting for a resource held by Pn, and Pn is waiting for a resource held by P0.

Resource Utilization

  • Each resource type Ri has Wi instances.
  • Each process utilizes a resource as follows: request → use → release.

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Description

Test your knowledge of deadlocks in operating systems with this quiz prepared by Dr. Hesham Salman. Learn about resource types, instances, and the characterization of deadlocks.

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