Re: [Gems-users] TM conflict case doubt

[ruzhu <kaoruzhu@xxxxxxxxx>]

you can see code in/ruby/simics/interface.C(h)
ruby_restart_transaction 

On Mon, 2009-09-14 at 11:50 -0500, holey003@xxxxxxx wrote:
> I went through the code but little confusion is still there. How it is 
> decided to restart all the transactions or retry for detected conflict?
> 
> On Sep 12 2009, ruzhu kao wrote:
> 
> >I/O is one of the darknesses in TM.  You may read codes in ruby/log_tm
> >
> >2009/9/13  <holey003@xxxxxxx>:
> >> Hi,
> >>
> >> I have some doubt regarding TM operation on conflict. Suppose executing
> >> code looks like this:
> >>
> >> BEGIN_TRANSACTION(x)
> >>   io_operation();     //1
> >>   a = b + c;          //2
> >>   c++;                //3
> >>   b = a + c;          //4
> >> COMMIT_TRANSACTION(x)
> >>
> >> Suppose conflict is detected for updating 'c'. Then corresponding core
> >> retries same transaction or again starts from line 1? What I understood 
> >> is,
> >> if logically later thread detects conflict, then it should restart the
> >> whole thread as previous thread must update 'c' first and then should be
> >> read by current thread. If so, where is this functionality implemented? 
> >> In
> >> transaction.c file?
> >>
> >> Isn't it possible that logically later thread gets hold of 'c' before the
> >> earlier thread because earlier thread is busy in i/o operation? Then the
> >> earlier thread will detect conflict?
> >>
> >> I am using benchmarks in microbenchmarks/transactional.
> >>
> >> Thanks,
> >> Anup
> >> _______________________________________________
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> >>
> >>
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