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copied!<p>From <strong>Boost.Asio</strong> docs:</p> <blockquote> <p>The io_service::strand class provides the ability to post and dispatch handlers with the guarantee that none of those handlers will execute concurrently.</p> </blockquote> <p>There's <a href="http://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/examples.html#boost_asio.examples.http_server_3" rel="nofollow">a good example</a> of <code>strand</code> usage in <strong>Boost.Asio</strong> examples.</p> <p><code>strand</code> guarantees that your handler execution will be synchronized. That means that <code>strand</code> is useful if your <code>io_service</code> is executed from multiple threads. It's not related to how you schedule your tasks (handlers).</p> <p><code>strand</code> cannot help you to do multiple socket read or write ops concurrently, because internal read/write execution cannot be done concurrently, so there should be just one active read or write async op. </p> <p>For <code>reads</code> you just call <code>async_read</code> to initiate read sequence and call it again from your read handler after consuming received data. The same that you do in single threaded environment. </p> <p>For <code>writes</code> if there're concurrent producers (if multiple threads provides data to be written to socket) you need a concurrent queue (e.g. <a href="http://www.boost.org/doc/libs/1_47_0/libs/circular_buffer/doc/circular_buffer.html#examples" rel="nofollow">boost circular buffer</a>, look for "Bounded Buffer Example"). Your write function takes data from this buffer and async writes it to socket. Your write handler invokes your write function.</p>

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