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Questions and Answers
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 ______
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
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
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
No preemption: a resource can be released only voluntarily by the ______ holding it, after that process has completed its task
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.
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.
the ______ consists of resources
the ______ consists of resources
Each resource type Ri has Wi instances. Each process utilizes a resource as follows: request use ______
Each resource type Ri has Wi instances. Each process utilizes a resource as follows: request use ______
Deadlock can arise if four conditions hold simultaneously. Mutual exclusion: only one process at a time can use a ______
Deadlock can arise if four conditions hold simultaneously. Mutual exclusion: only one process at a time can use a ______
A process holding at least one resource is waiting to acquire additional resources held by other ______
A process holding at least one resource is waiting to acquire additional resources held by other ______
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
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
Circular wait
Circular wait
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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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