Deadlock Prevention
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This document discusses deadlock prevention by invalidating one of the four conditions necessary for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. It describes strategies to prevent each condition, such as not requiring mutual exclusion for sharable resources, requesting all resources before execution or only when a process has none to prevent hold and wait, allowing preemption of held resources to prevent no preemption, and imposing a total ordering of resource requests to prevent circular wait. These techniques aim to ensure deadlock is excluded from the beginning.
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- 1. AISHWARYA COLLEGE OF EDUCATION, PALI Affiliated by JAI NARAIN VYAS UNIVERSITY, JODHPUR Topic :- DEADLOCK PREVENTION Presented by :- PRACHI MEWARA Of BCA2nd Year(2017-18)
- 2. DEADLOCK PREVENTION Deadlock Prevention ensures that deadlock is excluded from the beginning by invalidate at least one of the four necessary conditions. Deadlock Mutual exclusion Hold and wait Circular wait No preemption
- 3. • The four conditions to prevent deadlock :- Mutual Exclusion :- Not required for sharable resources; must hold for non sharable resources. Hold and Wait :- Must guarantee that whenever a process requests a resource, it does not hold any other resources. Require process to request and be allocated all its resources before it begins execution, or allow process to request resources only when the process has none. Low resource utilization; starvation possible.
- 4. No Preemption :- If a process that is holding some resources requests another resource that cannot be immediately allocated to it, then all resources currently being held are released. Preempted resources are added to the list of resources for which the process is waiting. Process will be restarted only when it can regain its old resources, as well as the new ones that it is requesting. Circular Wait :- Impose a total ordering of all resource types, and require that each process requests resources in an increasing order of enumeration.
- 5. THANK YOU