[Devel] TM callbacks

[Bogdan-Andrei Iancu]

Hi Elias,

you specify a callback via a function pointer - the code of the function 
exists in all processes (fork duplicated the code). So, the callback 
functions are executed by the process which process the requests that 
triggers the callback.
the processing of the the requests/replys is very serial....

regards,
bogdan

Elias Baixas wrote:

> Hi all, I have a question regarding transaction module callbacks:
> when I register a callback with register_tmcb( struct sip_msg* p_msg, 
> struct cell *t, int types, transaction_cb f, void *param ), the 
> transaction_cb function will be a pointer to a function in the address 
> space in the process which is registering the callback, so whenever an 
> event triggering the callback happens, the function which will be 
> called will always be in the same process address space, so the 
> callback must be very-reentrant, because that process may already be 
> processing a request/response.
> Am I right ? what issues should I take very care of while executing 
> the callback ?
>
> I'm doing my final project in telecommunications engineering. I'm 
> coding a SER module to generate transactions in behalf of external 
> events that will be reported to my module.
>
> Thanks for your help !
>
> Elias
>
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