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Start Your Coding Journey Now! It will only be released when Process 1 relinquishes it voluntarily after its execution is complete. 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. A deadlock can be detected by a resource scheduler as it keeps track of all the resources that are allocated to different processes.
It is very important to prevent a deadlock before it can occur. So, the system checks each transaction before it is executed to make sure it does not lead to deadlock. If there is even a slight chance that a transaction may lead to deadlock in the future, it is never allowed to execute. It is better to avoid a deadlock rather than take measures after the deadlock has occurred.
The wait for graph can be used for deadlock avoidance. This is however only useful for smaller databases as it can get quite complex in larger databases. David Meador.
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