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    <p>First of all, the <code>shutdown()</code> and <code>close()</code> calls in Boost.Asio call the underlying BSD socket implementation. So there is nothing "special" about Asio's shutdown() or close() calls.</p> <ul> <li><p><code>shutdown()</code> doesn't block. It is typically used to disable sends/receives or both (ie, send an EOF to the other end). It will NOT destroy the socket (i.e. the socket resource is NOT freed)</p></li> <li><p><code>close()</code> will free the socket resource. It may also block depending on the <code>SO_LINGER</code> option. But <code>SO_LINGER</code> is a tricky beast, to convince you: <a href="http://lists.freebsd.org/pipermail/freebsd-questions/2004-June/049093.html" rel="nofollow">http://lists.freebsd.org/pipermail/freebsd-questions/2004-June/049093.html</a> and <a href="http://developerweb.net/viewtopic.php?id=2982" rel="nofollow">http://developerweb.net/viewtopic.php?id=2982</a>. However, if you are using non-blocking sockets (i.e. O_NONBLOCK, which is what Boost.Asio is really wrapped up around), then close() doesn't block.</p></li> </ul> <p>Further reading: </p> <p><a href="http://linux.die.net/man/3/shutdown" rel="nofollow">http://linux.die.net/man/3/shutdown</a> <a href="http://linux.die.net/man/3/close" rel="nofollow">http://linux.die.net/man/3/close</a> </p> <p>And if you are Windows: <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms738547%28v=vs.85%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windows/desktop/ms738547%28v=vs.85%29.aspx</a> (read the comments, apparently the documented graceful shutdown techniques don't work all the time..)</p>
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    1. POIs boost::asio tcp socket shutdown blocking or not?
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    1. POIs boost::asio tcp socket shutdown blocking or not?
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    1. COCan you illustrate more on the shutdown() part. My experience always told me shutdown() is blocking, because there might still be date pending, and there are FIN/FIN ACK sequence.<br>
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      1. USJohn Crane
    2. COFirst of all, a FIN can also be thought of a "don't care" message. While writing such TCP code, its very easy to fall under some variant of the Two-Generals problem (read up on it). Now, to address your specific question. You would typically only call shutdown() when you are certain there is no more data to send/receive. This has to be ascertained (to whatever degree possible) by the application layer protocol. shutdown() might causes a recv()/write() to fail (which makes sense because that side of the socket is closed)
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