simple process rollback question

Posted by OckhamsRazor on Stack Overflow See other posts from Stack Overflow or by OckhamsRazor
Published on 2011-01-16T10:37:47Z Indexed on 2011/01/16 10:53 UTC
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java

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multithreading

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process

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parallel-processing

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rollback

hi folks! while revising for an exam, i came across this simple question asking about rollbacks in processes. i understand how rollbacks occur, but i need some validation on my answer. The question:

alt text

my confusion results from the fact that there is interprocess communication between the processes. does that change anything in terms of where to rollback? my answer would be R13, R23, R32 and R43. any help is greatly appreciated! thanks!

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