postgres-xc-developers

[Postgres-xc-developers] Locking issue in GTM

[Nikhil S. <ni...@st...>]

Hi,

PFA patch which fixes a locking issue in GTM_BeginTransactionMulti
function. If txn_count is more than 1, then gt_TransArrayLock will be
attempted to be locked multiple times inside the loop. The behavior is
really undefined for pthreads and we can see weird hangs here and
there because of it. I guess we got away with this till date because
it was mostly being called with value 1 for txn_count.


Regards,
Nikhils
-- 
StormDB - http://www.stormdb.com
The Database Cloud
Postgres-XC Support and Service

Re: [Postgres-xc-developers] Locking issue in GTM

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

Thanks Nikhils.   It looks nicd.   Let me take a bit more detailed
look before commit it.

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


2013/3/4 Nikhil Sontakke <ni...@st...>:
> Hi,
>
> PFA patch which fixes a locking issue in GTM_BeginTransactionMulti
> function. If txn_count is more than 1, then gt_TransArrayLock will be
> attempted to be locked multiple times inside the loop. The behavior is
> really undefined for pthreads and we can see weird hangs here and
> there because of it. I guess we got away with this till date because
> it was mostly being called with value 1 for txn_count.
>
>
> Regards,
> Nikhils
> --
> StormDB - http://www.stormdb.com
> The Database Cloud
> Postgres-XC Support and Service
>
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