On Wed, 11 Oct 2006, Prof. Max Fischer wrote: > Hi, > > I am using rtnet-0.9.5 with rtai3.3 on kernel 2.6.15. I would like to > implement an application using raw sockets with somewhat special > requirements: > There are situations where a few subsequent packets arrive very fast. > This means, that I would like to loop receiving already arrived packets. > Unfortunately, I only get one packet, subsequent receives time out. > > e.g., when I do > > send_packet (1) > send_packet (2) > recv_packet (3) > recv_packet (4) > > on a (hardware) loopback device, (3) is ok, but 4 times out (even after > a delay). After another send_packet, I get the packet from (2), but I'm > never able to recv all the packets that arrived. > I tracked down the situation and found out the following: > > In rt_packet_rcv (af_packet.c) > > after > > rtdm_sem_up(&sock->pending_sem); > > pending_sem->count doesn't increase with subsequent arriving packets. > This comes from pending_sem->type being a binary semaphore where I hoped > pending_sem might be counting.
This is a bug in the RTDM implementation of RTAI 3.3. Latest RTAI should have fixed this. Sebastian ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
