Enable keepalive for message port connections on windows

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@27320 72102866-910b-0410-8b05-ffd578937521

Source/NSConnection.m

@@ -1634,6 +1634,16 @@ static NSLock	*cached_proxies_gate = nil;
 - (void) setRootObject: (id)anObj
 {
   setRootObjectForInPort(anObj, _receivePort);
+#if	defined(__MINGW32__)
+  /* On ms-windows, the operating system does not inform us when the remote
+   * client of a message port goes away ... so we need to enable keepalive
+   * to detect that condition.
+   */
+  if ([_receivePort isKindOfClass: [NSMessagePort class]])
+    {
+      [self _enableKeepalive];
+    }
+#endif
 }
 
 /**