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Date: Wed, 23 May 2012 09:37:35 -0600
From: jlewis <joe@joe-lewis.com>
To: modules-dev@httpd.apache.org
Cc: bernhard.poechtrager@fabasoft.com
Subject: Re: Module: Mod_Dialup (ap_mpm_register_timed_callback)
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On Wed, 23 May 2012 06:43:33 +0000
"P=C3=B6chtrager, Bernhard" <bernhard.poechtrager@fabasoft.com> wrote:

> > -----Urspr=C3=BCngliche Nachricht-----
> > Von: Joe Lewis [mailto:jlewis@silverhawk.net] Im Auftrag von Joe
> > Lewis Gesendet: Dienstag, 22. Mai 2012 17:40
> > An: modules-dev@httpd.apache.org
> > Betreff: Re: Module: Mod_Dialup (ap_mpm_register_timed_callback)
> >=20
> >=20
> >=20
> > On 05/22/2012 12:27 AM, P=C3=B6chtrager, Bernhard wrote:
> > > Hello
> > >
> > > I am trying to work with asynchronous requests.
> > > With synchronous requests everything WORKS fine.
> > > I write it like mod_dialup.c.
> > > The result is that every second request is unsuccessful (The
> > > Browser is
> > loading the whole time).
> > Bernhard;
> >=20
> > Do you mean that the connection just appears to be loading?  Does it
> > timeout?  Or does the page successfully load?
> >=20
> > Do you see error messages?  Are you logging anything to help debug
> > this? Can you share things like - what you are trying to
> > accomplish, code, etc?
> >=20
> > Joe
> >=20
>=20
> Thanks for your reply.
> The "complete" explanation was in the first e-mail (apended at the
> end). I write it again with more information.
>=20
> I am trying to work with asynchronous requests.
> With synchronous requests everything WORKS fine.
> I write it like mod_dialup.c.
> The result is that every second request is unsuccessful (The Browser
> is loading the whole time). I put some logging-code into the
> programm. The result ist that the first request works well. When I
> make a second request the handler doesn't start at all. I get no
> error and no logging-output. I even log the event.c file, but I get
> nothing. The request is loading the whole time (I think until he
> reachs the time-out). After I cancel the request I can make another
> successful request. When I make another request I have the same
> problem. I mean every second request is unsuccessful. I even looked
> with Wireshark on the packages. When the problem appears he got only
> a few packages. I think the problem is in the line " rv =3D
> ap_queue_pop_something(worker_queue, &csd, &cs, &ptrans, &te);" in
> the methode "static void *APR_THREAD_FUNC worker_thread(apr_thread_t
> * thd, void *dummy)" in the event.c file. I think that the first
> request isn't finished completely.
>=20
> The relevant Code of the handler is (the change from sync to async):
> ap_mpm_register_timed_callback(apr_time_from_msec(1000),callback,prr);
> return SUSPENDED;
>=20
> The callback method:
> static void callback(void* data)
> {
>     request_rec* prr =3D (request_rec*) data;
>     ap_finalize_request_protocol(prr);
>     ap_process_request_after_handler(prr);
> }
> Do you have any ideas?
>=20

Since you are developing your own MPM, I'd suggest getting an strace
(Linux) or something akin to truss (BSD).  You need to find out exactly
what your MPM is doing when the first request "finishes", and then when
the second one starts up.  strace will give you a LOT of information,
and the more information you have, the better.

Joe