Thread-safely closing a boost::asio::ip::tcp::socket being used synchronously?

If your acceptor is in async_accept, you can call ip::tcp::acceptor::cancel() to cancel any async operations on it. Note this may fire handlers in this acceptor with boost::asio::error::operation_aborted error code.

Having spent some time looking into this there is only 1 thread safe manner in which this can be achieved: by sending a message to the socket (on a thread not waiting on accept()) telling the thread to close the socket and the acceptor. By doing this the socket and acceptor can be wholly owned by a single thread.

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