Re: [Postgres-xc-developers] Improper locking in GTM again?

[Koichi S. <koi...@gm...>]

Thanks Nikhil.   Recent global xmin needs a bit of improvement.   Lock
should be  fixed also.    I can look into it after I have a bit more
progress on pgxc_ctl C version code.    You're welcome to write the
fix.

Regards;
----------
Koichi Suzuki


2013/3/4 Nikhil Sontakke <ni...@st...>:
> Hi,
>
> If I look at GTM_GetTransactionSnapshot() function, it's taking a READ
> lock on GTMTransactions.gt_TransArrayLock. After taking that lock it's
> modifying fields like
>
> GTMTransactions.gt_recent_global_xmin
> GTMTransactions.gt_transactions_array
>
> Hardly READ type of behavior. This behavior particularly seems
> dangerous if multiple threads modify the gt_recent_global_xmin value
> above while holding read locks.
>
> Regards,
> Nikhils
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