Deadlock

Deadlock ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Dealing with Deadlock ,[object Object],[object Object],[object Object],[object Object],[object Object]

Relevant Events ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

“ Claim” (Future-Request) Edges

A System Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example V U T S P = {S,T,U,V} P = {P1,P2} P1(S) = {T,U} P1(U) = {V} … P2(S) = {U} … 1 2 1 2 1 1 2

Resource (Allocation) Graph (RAG) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Invariants on RAG ,[object Object],[object Object],[object Object],[object Object]

State Transitions ,[object Object],[object Object],[object Object]

[object Object],[object Object],State Transitions (con’d)

Reduction on RAG ,[object Object],[object Object]

Theorems ,[object Object],[object Object],[object Object],[object Object],[object Object]

Data structures for RAG ,[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock Detection Algorithm ,[object Object]

Example ,[object Object],[object Object]

Recovery ,[object Object],[object Object],[object Object]

Prevention ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Serialization ,[object Object],[object Object]

One-shot Allocation ,[object Object],[object Object],[object Object]

Hierarchical Allocation ,[object Object],[object Object],[object Object],[object Object]

Proof that deadlock cannot occur ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Properties ,[object Object],[object Object],[object Object],[object Object]

Avoidance ,[object Object],[object Object],[object Object]

Banker's Algorithm ,[object Object],[object Object]

Safe state ,[object Object],[object Object],[object Object],[object Object]

Example ,[object Object],[object Object],[object Object]

Unsafe state ,[object Object],[object Object],[object Object]

Banker’s algorithm ,[object Object],[object Object],deadlock unsafe safe

Implementation method ,[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock

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Deadlock