deadlock characterization part 1 | necessary conditions for deadlock

#deadlocks #deadlockcharacterization #operatingsystemlectures
A deadlock happens in operating system when two or more processes need some resource to complete their execution that is held by the other process.
A deadlock occurs if the four Coffman conditions hold true. But these conditions are not mutually exclusive. They are given as follows:
Mutual Exclusion
There should be a resource that can only be held by one process at a time. In the diagram below, there is a single instance of Resource 1 and it is held by Process 1 only.
Hold and Wait
A process can hold multiple resources and still request more resources from other processes which are holding them. In the diagram given below, Process 2 holds Resource 2 and Resource 3 and is requesting the Resource 1 which is held by Process 1.
No Preemption
A resource cannot be preempted from a process by force. A process can only release a resource voluntarily. In the diagram below, Process 2 cannot preempt Resource 1 from Process 1. It will only be released when Process 1 relinquishes it voluntarily after its execution is complete.
Circular Wait
A process is waiting for the resource held by the second process, which is waiting for the resource held by the third process and so on, till the last process is waiting for a resource held by the first process. This forms a circular chain. For example: Process 1 is allocated Resource2 and it is requesting Resource 1. Similarly, Process 2 is allocated Resource 1 and it is requesting Resource 2. This forms a circular wait loop.

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Simply superb explanation sir

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Cool explanation sir tq

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Can someone clarify my doubt . What does simultaneously mean? All the 4 should occur and then dead lock occurs or any one condition is enough to get a deadLock

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at the same time if those 4 conditions occurs for a resource allocation graph then there may be a deadlock. if we eliminate one of them the no deadlock.

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tqq.. sir

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If any one of the condition is not satisfied then the dead lock will be occurred or not

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Not occurs

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Sir what is the difference between Hold and wait and circular wait , both seems similar ?

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Hold and Wait" is a condition in which a process holds allocated resources while waiting for additional resources. This means that a process can request new resources even if it's already holding some resources. Circular Wait" is a condition where a set of processes are waiting for resources in a circular chain.

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