Hellow, can anyone send me the transmit.c of chapter09, which is working fine...facing few problems in trasmit part of my code...following problems are coming... #1 THREAD 21 is infinately looping in get_mpacket(..).. waiting for port.state to become valid...in the following loop while (!port_state.valid) { ctx_swap(); } #2 Thread 20 is continuously going in the condition where consumer == producer due to these receive code got stuck when the queue between receiver and transmitter ME becomes full......... so if anyone can find out why such a thing is happening or if anyone can send me the trasmit code which is working fine....it would be a gr8 help.....urgently required this....have to complete the module by this weekend.... Thanxs in advance... Regards, Nitin Makhija M.Tech(CS) IIT-Kharagpur