Скачать или смотреть 5.0- Deadlock Syllabus Topic Description For NET-GATE In Operating System In Hindi By Deepak Garg

Deadlock Syllabus Topic Description For NET GATE In Operating
System In Hindi By Deepak Garg
In deadlock
1) What Is Deadlock
2) Necessary Condition For Deadlock
3) Resource Allocation Graph
4) Deadlock Handling Method
5) Deadlock Prevention
6) Deadlock Avoidance
7) Deadlock Detection And Recovery
8 ) Deadlock Ignorance

Introduction of Deadlock in Operating System
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.
Consider an example when two trains are coming toward each other on same track and there is only one track, none of the trains can move once they are in front of each other. Similar situation occurs in operating systems when there are two or more processes hold some resources and wait for resources held by other(s). For example, in the below diagram, Process 1 is holding Resource 1 and waiting for resource 2 which is acquired by process 2, and process 2 is waiting for resource 1.





deadlock







Deadlock can arise if following four conditions hold simultaneously (Necessary Conditions)
Mutual Exclusion: One or more than one resource are non-sharable (Only one process can use at a time)
Hold and Wait: A process is holding at least one resource and waiting for resources.
No Preemption: A resource cannot be taken from a process unless the process releases the resource.
Circular Wait: A set of processes are waiting for each other in circular form.


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