I'm writting a multiplatform app which uses a tcp::acceptor. Thread one does:                {                    std::cout<<"Oh but I interupted: "<close();                    std::cout<<"Done interupting "<join();                std::cout<<"Join complete"<

{            boost::system::error_code ec;            boost::asio::socket_base::non_blocking_io command(false);            _mySocket.io_control(command,ec);

           boost::system::error_code ec1;            std::cout<<"About to accept "<accept(_mySocket,ec1);            std::cout<

According to the reference: http://www.boost.org/doc/libs/1_38_0/doc/html/boost_asio/reference/ip__tcp/a... acceptor object is not threadsafe. This means you should not access it this way, and if you do, the behaviour is undefined. To cancel acceptor you could use async_accept() and then post close() to the same thread, using io_service.post().