Write to boost::asio socket from different threads?

Well according to the documentation tcp::socket is not thread safe when shared between multiple threads. So you either do a synchronisation like you suggested with boost::mutex or you use async write. The io_service the work for you.

Write and async_write are not thread safe in the manner you are using them. The canonical way to approach this is to queue your messages, then write them out one at a time.

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