Consider six transactions T 1 , T 2 , T 3 , T 4 , and T 5 with:
T 1 initiated at site S 1 and spawning an agent at site S 2 ,
T 2 initiated at site S 3 and spawning an agent at site S 1 ,
T 3 initiated at site S 1 and spawning an agent at site S 3 ,
T 4 initiated at site S 2 and spawning an agent at site S 3 ,
T 5 initiated at site S 3 .
The locking information for these transactions is shown in following table.
(a) Produce the local wait-for-graphs (WFGs) for each of the sites. What can you conclude from the local WFGs?
(b) Using the above transactions, demonstrate how Obermarck’s method for distributed deadlock detection works. What can you conclude from the global WFG?
a) 
b) 
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