I'm really interested in exemple 5 of boost asio: http://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/tutorial/tuttimer5/... I've tried it with boost-1.47.0. I can compile without warnings using: g++ -Wall -pedantic -lboost_thread -lboost_system -o timer5 timer5.cpp but when I launch the executable it gives me a Segmentation fault. Commenting the code I found that the segmentation fault raise at the 3rd line of main: boost::thread t(boost::bind(&boost::asio::io_service::run, &io)); I'm trying on the following machine: Linux office-007 2.6.38-11-generic #48-Ubuntu SMP Fri Jul 29 19:02:55 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux Can anyone help me? -- Alessandro Candini MEEO S.r.l. Via Saragat 9 I-44122 Ferrara, Italy Tel: +39 0532 1861501 Fax: +39 0532 1861637 http://www.meeo.it ======================================== "ATTENZIONE:le informazioni contenute in questo messaggio sono da considerarsi confidenziali ed il loro utilizzo è riservato unicamente al destinatario sopra indicato. Chi dovesse ricevere questo messaggio per errore è tenuto ad informare il mittente ed a rimuoverlo definitivamente da ogni supporto elettronico o cartaceo." "WARNING:This message contains confidential and/or proprietary information which may be subject to privilege or immunity and which is intended for use of its addressee only. Should you receive this message in error, you are kindly requested to inform the sender and to definitively remove it from any paper or electronic format."