[Kamailio-Devel] calculating average statistics

[Klaus Darilion]

Henning Westerholt schrieb:
> 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.

Actually I have no clue about locks, I only know that in the past there 
were heave atomic locks update in ser 2.0

regards
klaus