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Explain about deadlock prevention?
In order for the occurrence of deadlock, the four conditions like mutual exclusion, hold and wait, no pre-emption and circular wait must happen. By ensuring that one of these conditions cannot hold, we can stop the occurrence of deadlock.
Mutual exclusion
It must hold for non-sharable resources. For example a printer cannot be simultaneously shared by several processes. Sharable resources do not need mutually exclusive access, and therefore cannot be include in deadlock. Read-only files are a good example of a sharable resource.
Hold and wait
To ensure that hold and wait condition never happens in the system, we must guarantee that, whenever a process requests a resource, it does not hold any other resources. The protocols used are
1. Every process is to be request and be allocated all its resources before it begins execution.
2. Permits a process to request some resources only when the process has none (no other resources).
The term ‘page traffic’ explains Page traffic’ explains the movement of pages in and out of memory.
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