Hi guys, Picture a server class with the following methods (pseudocode): void Server::Work() { // Start the Async receive. mSocket.async_receive_from( *blah* ) ); // Start the Async IO service. mASIOService.run(); } void Server::Start() { // Launch a new thread to do the work. mThread = boost::thread( boost::bind( &Server::Work, this ) ); } void Server::Stop() { // Post the stop request to the io_service. mASIOService.post( boost::bind( &Server::DoStop, this ) ); // Join the comms thread. mThread.join(); } void Server::DoStop() { // Actually stop the io_service. mASIOService.stop(); } Assuming handling of packets is all correctly implemented, is it safe for the user to simply call the Stop() object method to stop the server? Basically, can a function that's been post()ed to an io_service call io_service.stop() for that io_service? TIA, Dom