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copied!<p>First I think that this page is relevant, regarding half-open connections. <a href="http://nitoprograms.blogspot.com/2009/05/detection-of-half-open-dropped.html" rel="nofollow noreferrer">http://nitoprograms.blogspot.com/2009/05/detection-of-half-open-dropped.html</a></p> <p>That being said, TCP is designed to hide connection problems, so you may often find yourself in cases where the connection is broken, but neither side thinks it is. You have addressed this partially by using timeouts and taking that as a sign the connection is broken. </p> <p>Since you are writing the client and server, I would avoid relying on TCP to tell you when the connection is broken altogether. I would just have the server also acknowledge the receipt of the result from the client. Then both sides will expect immediate responses to their messages, and you can track which messages have been ack'd and set an appropriately small timeout for receiving the ack. This is not a timeout on the send or receive, but a timeout on the time between sending a message and receiving the ack for that message. Then you can set the timeout appropriately depending on the quality of your connection (e.g. very small if you are running on loopback, but large if running over wireless with a weak signal).</p> <p>Regarding the options you list, you will want to use SO_REUSEADDRESS so that you won't be prevented from reopening the socket, for example if it hasn't finished closing from a previously killed process.</p>

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