What is a deadlock? How to know if a deadlock is present?

Question

Accepted Answer

A deadlock is a situation where two or more processes are unable to proceed because they are waiting for each other to release resources.

Deadlocks occur when two or more processes are blocked and unable to continue executing.
To detect a deadlock, look for circular wait, hold and wait, no preemption, and mutual exclusion.
Examples of deadlocks include a printer that is waiting for a user to replace the paper tray, or two trains that are stuck on the same track waiting for each other to move.
Deadlocks can be prevented by using techniques such as resource allocation graphs, banker's algorithm, and timeouts.

Accepted Answer

deadlock occurs when two or more tasks permanently black each other by task having a lock on a resource that the other tasks trying to lock. Deadlock if all

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deadlock by observing a circular dependency where each process is waiting for a resource held by another process in the cycle, effectively blocking all involved processes. 
deadlock by observing a circular dependency where each process is waiting for a resource held by another process in the cycle, effectively blocking all involved processes.

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deadlock occurs when two or more tasks permanently black each other by task having a lock on a resource that the other tasks trying to lock. Deadlock if all

Accepted Answer

deadlock is a situation where two or more processes are unable to proceed because they are waiting for each other to release resources.Deadlocks occur when two or more processes are blocked

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Deadlock. This is situation in computer science where two or more processes are blocked indefinitely, each waiting for the other to release a resource.
 How to know if a deadlock is present:
1. Mutual exclusion
2. Hold and wait 
3. No preemption
4. Circular wait

Accepted Answer

A deadlock occurs when two or more tasks permanently black each other by task having a lock on a resource that the other tasks trying to lock. 
Deadlock if all thread pick up their lift chopstick before any thread picks up the right chopstick.

Accepted Answer

A deadlock occurs when two or more tasks permanently black each other by task having a lock on a resource that the other tasks trying to lock. 
Deadlock if all thread pick up their lift chopstick before any thread picks up the right chopstick.

Accepted Answer

Work process

Accepted Answer

Deadlock detection
Make a copy of the resource allocation graph.
While there is a process or resource with no outgoing edge: ...
If you can remove all processes, there is no deadlock: you can run all processes to completion.
If you can't, then there must be a cycle, so the system is deadlocked.

What is a deadlock? How to know if a deadlock is present?

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