Fix race condition that can cause close of socket to hang

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2037 42af7a65-404d-4744-a932-0658087f49c3

Documentation/NuttX.html

@@ -8,7 +8,7 @@
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       <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
-      <p>Last Updated: September 10, 2009</p>
+      <p>Last Updated: September 11, 2009</p>
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@@ -1521,6 +1521,9 @@ nuttx-0.4.11 2009-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
 	  bug in polling for connections.  The logic worked if the poll was inplace
 	  before the connection was received; but the poll failed to awaken if the
 	  connection was already pending in the backlog when poll() was called.
+	* net/net_close.c.  Fixed another important TCP/IP race condition bug:  If
+	  the host closes the TCP connection just before the target calls close(), then
+	  the close operation may hang indefinitely!
 
 pascal-0.1.3 2009-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;