Question: Suppose your system uses deadlock detection. How does it know when deadlock happens? After a process is granted a resource, the OS simulate the processes

Suppose your system uses deadlock detection. How does it know when deadlock happens?
After a process is granted a resource, the OS simulate the processes running to completion. If it can then there is no deadlock.
At regular times during its execution the OS will simulate the processes running to completion. If it can there is no deadlock.
Before a process granted a resource, the OS simulate the processes running to completion. If it can then there is no deadlock.
When requested by the user, the OS will simulate the processes running to completion. If it can there is no deadlock.

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