Re: Problem with blocking connect().

Hi, Oded.
Either I not correctly undestand kannel source or we talk about different
things.
So I explain my point of view with little example.
Suppose we have 5 clients with phones and they work simultaneously.
They try to fetch some resources at once.
The first one try to fetch http://foo.bar.com/index.html.
It is unknown host for me and I can't be sure that it is not
'terribly malfunctioned server'.
All 5 requests http_start_request puts in one queue and
write_request_thread start to deal with this one by one.
send_request use conn_open_tcp to foo.bar.com.
At that point gateway blocks other 4 request untill connect to foo.bar.com will
return. In real life it meens that these 4 client (with normal requests) will 
receive 'gateway not responding' after timeout.
Am I wrong with my scenario?

Oded Arbel wrote:

>>-----Original Message-----
>>From: Vjacheslav Chekushin [mailto:[email protected]]
>>
> 
>>Hi, Oded.
>>As I undestand from kannel architecure, we have 1 thread that 
>>write requests 
>>from client to network. 
>>
> 
> For HTTP alone, not every connection. 
> 
> 
>>So if one connect will blocks for 1 
>>minute, then thread
>>stops to serve other requests for this time and other clients wait for
>>this time too.
>>
> 
> I don't think we need to change that. connect() should never block for 1 minute- while the TCP specs allow for upto 2 minutes, this is hardly ever the case. the latency from one corner of the earth to the other is hardly over a few seconds. the only way that a connect would block for so long is if you either have a terribly malfunctioned server or you are trying to connect to a port blocked by a firewall with a DROP policy - either case the configuration is not valid, so I don't think we should program Kannel to work with it, and I personally would prefer that my system would get stuck on such cases as that would alert me that something in my setup is broken.
> 
> --
> Oded Arbel
> m-Wise mobile solutions
> [email protected]
> 
> +972-9-9581711 (116)
> +972-67-340014
> 
> ::..
> Von Neumann was the subject of many dotty professor stories.  Von Neumann
> supposedly had the habit of simply writing answers to homework assignments on
> the board (the method of solution being, of course, obvious) when he was asked
> how to solve problems.  One time one of his students tried to get more helpful
> information by asking if there was another way to solve the problem.  Von
> Neumann looked blank for a moment, thought, and then answered, "Yes.".
> 
> 


-- 
Vjacheslav Chekushin                                mailto:[email protected]
Latvian Mobile Phone Company                        http://www.lmt.lv