Hi Julien and Marcel,
When I execute 2 servers on masters side (one only sending and the other =
only
receiving) using diferents rfcomm channels, I also receive corrupt data (=
very
rarely :-( ). If they're both sending or receiving, everything works fine=
... I
think it's possible to use semaphores to synchronize the 2 processes but =
I'd
like to use a simpler solution or at least understand where the problem i=
s.
Regards
Didier
> Am Di, den 01.06.2004 schrieb [email protected] um 13:16:
>
> Hi Didier,
>
> > Hello,
> >
> > I'm writting a server-client application over bluez using rfcomm sock=
ets.
> I've
> > created two threads: one for sending and the other for receiving. The
> problem
> > occurs sometimes (sporadical) and only when I'm sending and receiving=
data
> at
> > the same time: The received data seems to be corrupt... Do I have to =
use
> > mutexes or other synchronizing method?
>
> If you are using wo threads to read/write RFCOMM packets, your
> read/write methods should be synchronized.
>
> Regards,
>
> Julien
>
> > The error ocurrs more often if I execute
> > more than one server at the same time.
> >
> > Thanks.
> >
> > PS: Please tell me if I'm sending this message to the right mailing l=
ist...
> >
> > Didier.
> >
> >
> >
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>
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Hello Marcel,
I've compiled kernel-2.6.6 with the new mh3 patch and now, everything wor=
ks
fine. So, I think it is a kernel bug (2.4.20). It also works without
semaphores.
Just one more thing about this: The number of bytes sent and received is =
the
same but the data received appears shifted by one byte... Strange.
If you're still interested, I'll send you a small program in a few days (=
I have
some work to do for now...).
Once again, thank you Marcel.
Regards,
Didier
> > When I execute 2 servers on masters side (one only sending and the ot=
her
> > only receiving) using diferents rfcomm channels, I also receive corru=
pt
> > data (very rarely :-( ). If they"re both sending or receiving, everyt=
hing
> > works fine...
> >
> > think it"s possible to use semaphores to synchronize the 2 processes =
but I"d
> > like to use a simpler solution or at least understand where the probl=
em is.
>
> if you are using two different RFCOMM channels and this happens it look=
s
> like a bug in the kernel code. As I said, check the latest kernel and
> try to send us a simple program that triggers this effect.
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Hi Didier,
> When I execute 2 servers on masters side (one only sending and the other only
> receiving) using diferents rfcomm channels, I also receive corrupt data (very
> rarely :-( ). If they're both sending or receiving, everything works fine... I
> think it's possible to use semaphores to synchronize the 2 processes but I'd
> like to use a simpler solution or at least understand where the problem is.
if you are using two different RFCOMM channels and this happens it looks
like a bug in the kernel code. As I said, check the latest kernel and
try to send us a simple program that triggers this effect.
Regards
Marcel
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