Boost::asio, threads and synchronization?

1) Have a look at io_service::work . As long as an work object exists io_service::run will not return. So if you start doing your clean up, destroy the work object, cancel any outstanding operations, for example an async_read on a socket, wait for run to return and clean up your resources.

As the documentation suggests, a pool of threads invoking io_service::run is the most scalable and easiest to implement.

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