[PD] Netsend/receive crashes

[Hans-Christoph Steiner]

Forcably disconnecting a TCP connection causes the program to wait for  
a response, which feels like a crash.  Its not just Pd, it'll happen  
with any TCP networking that does not have a thread for each  
connection.  Martin Peach's tcpserver object handles this stuff much  
better, or for netsend/netreceice, you can use UDP and you shouldn't  
have these hang ups since there is no connected state in UDP.

.hc

On Nov 18, 2009, at 2:08 PM, matthem5 at vt.edu wrote:

>
> We have discovered an issue with the netsend and/or netreceive  
> objects.  If a
> patch which is sending of receiving network data is closed with the  
> connection
> still open and transmitting/receiving data at a high rate, it seems  
> that the
> connection is sometimes not closed properly.  If the same patch is  
> reopened
> without closing PD sometimes the connection claims to be valid, as  
> in it gives
> the error "error: netsend_connect: already connected", but data will  
> not
> transmit and closing the patch crashes PD.  What could be causing  
> the patch to
> close improperly?
>
> If you would like to try to recreate the error, I have included the  
> text version
> of our test patch.  After opening the patch, connect the netsend  
> object and the
> toggle the metro on to send data.  Without doing anything else to  
> the patch,
> simply close it with the X in the top right corner.  Then reopen the  
> patch,
> without quitting PD and trying to connect the netsend object again.   
> When we
> did this, it sometimes gave us an error and closing the patch killed  
> PD.
> Sometimes it took a few times closing and reopening the patch for  
> this to
> occur.  Could this be a race condition when freeing objects in a  
> patch?
>
> Any help would be greatly appreciated, thank you.
>
> Our test patch:
>
> #N canvas 568 250 450 300 10;
> #X obj 105 179 netsend 1;
> #X obj 237 113 + 1;
> #X msg 237 91 1;
> #X floatatom 268 161 5 0 0 0 - - -;
> #X obj 300 19 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
> 1;
> #X obj 147 144 prepend send;
> #X obj 101 207 netreceive 9997 1;
> #X obj 100 234 prepend set;
> #X msg 103 264 7101;
> #X obj 282 55 metro 10;
> #X msg 110 36 connect localhost 9997;
> #X connect 1 0 3 0;
> #X connect 1 0 5 0;
> #X connect 2 0 1 0;
> #X connect 3 0 1 1;
> #X connect 4 0 9 0;
> #X connect 5 0 0 0;
> #X connect 6 0 7 0;
> #X connect 7 0 8 0;
> #X connect 9 0 2 0;
> #X connect 10 0 0 0;
>
> _______________________________________________
> Pd-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list



----------------------------------------------------------------------------

I have the audacity to believe that peoples everywhere can have three  
meals a day for their bodies, education and culture for their minds,  
and dignity, equality and freedom for their spirits.      - Martin  
Luther King, Jr.