Deadlock in Operating System | 4 Conditions of Deadlocks | Deadlock Handling - Process Management

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--------------------------------------------------------------------------------------------- In this deadlock in OS video tutorial, we will understand what is a deadlock in Operating systems, what are the conditions that result in deadlocks & strategies for handling deadlocks.
Deadlocks in OS -
A process in operating systems uses different resources and uses resources in following way.
1) Requests a resource
2) Use the resource
2) Releases the resource
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.
Deadlock can arise if following four conditions hold simultaneously (Necessary Conditions) -
1) Mutual Exclusion: One or more than one resource are non-sharable (Only one process can use at a time)
2) Hold and Wait: A process is holding at least one resource and waiting for resources.
3) No Preemption: A resource cannot be taken from a process unless the process releases the resource.
4) Circular Wait: A set of processes are waiting for each other in circular form.
Methods for handling deadlock -
There are three ways to handle deadlock
1) Deadlock prevention or avoidance - The idea is to not let the system into deadlock state.
2) Deadlock detection and recovery - Let deadlock occur, then do preemption to handle it once occurred.
3) Ignore the problem all together - If deadlock is very rare, then let it happen and reboot the system. This is the approach that both Windows and UNIX take.
Following three strategies can be used to remove deadlock after its occurrence -
1) Preemption - We can take a resource from one process and give it to other. This will resolve the deadlock situation, but sometimes it does causes problems.
2) Rollback - In situations where deadlock is a real possibility, the system can periodically make a record of the state of each process and when deadlock occurs, roll everything back to the last checkpoint, and restart, but allocating resources differently so that deadlock does not occur.
3) Kill one or more processes - This is the simplest way, but it works.
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#Deadlock #OperatingSystems #OS

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[@SimpleSnippets]

What is it? Maybe I can help. I'll check up ✌️

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Dead lock algorithms ? Can you prepare that sir? I don't want because my semester is going to complete by tomorrow but for next year's students it gonna help And finally thanq you very much sir this semester we have os subject and successfully completed with great marks I had given a seminar on CPU scheduling with reference of your videos and got great response in my class ..👍☺️☺️☺️😊😊😊

[@SimpleSnippets]

Yes sure I have some topics under deadlock detections and preventions algorithms. Right now already busy with 2-3 different things so that's why kind of busy but surely I'll cover these topics. And wow bro, thank you so much for such positive feedback and I'm happy you got help from the OS videos. And also thanks for using the reference of my videos in your seminar buddy ✌️ do share the channel with all your friends and Juniors, that'll be the best help and support ❤️ Keep in touch ✌️

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Abbooo

[@nikitamishra7414]

Thanks tanmay always helpfull😊 I want more content about prevention avoidance ND detection. What I do??

[@SimpleSnippets]

Hey hi Nikita, thank you so much buddy for the positive feedback. I do have plans to cover further topics which you've mentioned but it'll kinda take time. Currently working on many other things. Well at this moment I would suggest to Google it (which I guess you already know but still 😅) ✌️

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Simple Snippets haha great suggestion😂😂😂 OK thank uh😅 i'll definitely apply on it😜

[@SimpleSnippets]

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Simple Snippets 😂🤗

[@radharanipanda3784]

Good morning sir.. why there's only one video of deadlock topic.. we need more videos for the full concept.. please take intiative for it

[@SimpleSnippets]

RIght now I am focusing on DSA. You may list down some topics you want to see here & I will note it down for futher considerations ✌

[@radharanipanda3784]

@@SimpleSnippets Thank you so much sir for the reply. I need deadlock avoidence, detections, Banker's algorithm & related mathematical concepts sir. If now DSA will be published on this site,then now I will also start DSA ,after that I will move to OS (Deadlock).

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Display is not clear..fonts are too small...but teaching way is superb

[@SimpleSnippets]

Will make sure to have better fonts and larger size in future videos. Thank you for the positive feedback

[@lu-dx6oh]

deadlock your in traffic everyone wants to move but your stuck because someone is blocking the road and you try to make the light but end up blocking the road for someone else , why couldn't my professor use that analogy

[@SimpleSnippets]

Hehe well I hope you got this one well though 😇🙏

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8:52

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[@SimpleSnippets]

Hehe, thank you so much buddy ✌️😇