Hi, i'm trying to create a simple socket server wich should be able to shut down when receiving a specific message. I've tried to alter the blocking tcp echo server example of the boost::asio library, but i'm not sure how to properly end the main "listening" loop from within the session thread. here's the modified asio example. when i try to close the acceptor from within the session thread, i get an exception "*The file handle supplied is not valid". *i assume this is the wrong place to close the acceptor / stop the io_service, but i don't know where else i can do this: using boost::asio::ip::tcp; const int max_length = 1024; typedef boost::shared_ptrtcp::socket socket_ptr; boost::asio::io_service io_service; tcp::acceptor* acceptor; void session(socket_ptr sock) { try { for (;;) { char data[max_length]; boost::system::error_code error; size_t length = sock->read_some(boost::asio::buffer(data), error); if (error == boost::asio::error::eof) break; // Connection closed cleanly by peer. else if (error) throw boost::system::system_error(error); // Some other error. std::string message = data; if (message.compare("SHUTDOWN") == 0) { //how to terminate the server through an incoming message ? acceptor->close(); io_service.stop(); } boost::asio::write(*sock, boost::asio::buffer(data, length)); } } catch (std::exception& e) { std::cerr << "Exception in thread: " << e.what() << "\n"; } } void server(boost::asio::io_service& io_service, short port) { acceptor = new tcp::acceptor(io_service, tcp::endpoint(tcp::v4(), port)); std::cout << "server started" << std::endl; for (;;) { if (acceptor->is_open()) { socket_ptr sock(new tcp::socket(io_service)); acceptor->accept(*sock); boost::thread t(boost::bind(session, sock)); } else break; } std::cout << "server stopped"; } int main(int argc, char* argv[]) { try { server(io_service, 22222); } catch (std::exception& e) { std::cerr << "Exception: " << e.what() << "\n"; } delete acceptor; return 0; }