Thiago, Thanks for the reply. <div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> What function did you call in the processing thread? If you called dbus_connection_read_write, it'll block on the socket access. You need to release the transport to make other threads work. In other words, you need a full mainloop in your thread: a select(2)-based socket notifier and timer implementation. </blockquote><div> I use dbus_connection_read_write_dispatch and a  filter func that just does dmessage_get_args and returns NOT_YET_HANDLED. The send thread does something like this dbus_bus_get() dbus_message_new_signal() dbus_message_append_args() dbus_connection_send() dbus_connection_flush() All the calls other than flush returns without error. I assume thats because they dont use the transport? Do i still need the main loop you are talking about in the above simple scenario? Thanks, -K </div></div>