[Kamailio-Devel] calculating average statistics

[Henning Westerholt]

On Monday 25 August 2008, Juha Heinanen wrote:
> i'm not sure if current statistics.h interface allows keeping track of
> average of something.  if i use get_stat to get the current average and
> current count value, do my calculation of new average and then update
> average and count values, some other process may have in the meanwhile
> done its update and thus messed up my calculation.
>
> in order to solve this, should there be a new update_average_stat macro
> that does the above under a lock?

Hi Juha,

at the moment there are two ways of updating statistic values atomically. If 
NO_ATOMIC_OPS is defined, then one big lock is used. In this way i think it 
should not that difficult to implement a function like you described. But 
from a performance POV its better to use the atomic functions defined in 
atomic.h, which are the default i think. This functions are defined as some 
assembler instructions, and its probably a little harder to define here 
something like this.

But i think it would be a good to have such a function.

Cheers,

Henning