Обсуждение: [SQL] Static variable inside PL/pgSQL (or) native C function

Hi,

Is it possible to have static variable inside pgSQL C functions (or)
PL/pgSQL?? I'm having a use case where I need to update a counter inside the
function & it should be thread-safe.

I've tried using static variable inside the C function along with
pthread_mutex_lock/pthread_mutex_unlock. And found functions are not shared
among each other. 

Thanks,
Athi



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David G Johnston wrote
> On Fri, Sep 29, 2017 at 6:46 AM, athinivas <

> athinivas@

> > wrote:
>
>> Hi,
>>
>> Is it possible to have static variable inside pgSQL C functions (or)
>> PL/pgSQL?? I'm having a use case where I need to update a counter inside
>> the
>> function & it should be thread-safe.
>>
>> I've tried using static variable inside the C function along with
>> pthread_mutex_lock/pthread_mutex_unlock. And found functions are not
>> shared
>> among each other.
>>
>>
> Don't know what's possible in C; pretty sure no in pl/pgsql.
>
> Why not just use a table and SQL locking features?
>
> Dave​

Sadly, I'm doing it in slave server, so not able to use any table
INSERT/UPDATE. Does current_Setting() can be used to access any global
variables??

thanks,
Athi



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