Re: [Boost-users] [ASIO] io_service.run() call is not blocking until async_write completes

This doesn't appear to be clear from the tutorials. Is there a better resource for "howto" than the boost site tutorials?

You've got: a) tutorial, b) fully functional examples, c) reference. Probably your use-case is not covered either in tutorial or in the examples, but in the reference you can find all the needed information. By the way, note that in asio you've got blocking i/o as well, so if you just try to emulate blocking behaviour using async. calls, it's already there.