implement keeplaive system.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@27108 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,12 @@
+2008-11-20  Richard Frith-Macdonald <rfm@gnu.org>
+
+	* Headers/Foundation/NSConnection.h: New ivars
+	* Source/NSConnection.m: Add diuagnostic information and implement
+	private mechanism for keepalive (for mswindows, where the NSMessagePort
+	implementation doesn;t know if the remote end has gone away until it
+	attempts to send to it).
+	* Tools/gdnc..m: Use private keepalive mechanism.
+
 2008-11-19  Richard Frith-Macdonald <rfm@gnu.org>
 
 	* Source/NSData.m: Fix bug #24883

Tools/gdnc.m

@@ -173,6 +173,9 @@ ihandler(int sig)
 }
 @end
 
+@interface	NSConnection (Private)
+- (void) _enableKeepalive;
+@end
 
 @interface	GDNCNotification : NSObject
 {
@@ -605,7 +608,13 @@ ihandler(int sig)
 	   name: NSConnectionDidDieNotification
 	 object: newConn];
   [newConn setDelegate: self];
-  [newConn _enableKeepalive];
+  /* For ms-windoews we need to enable keepalive on the connection so that
+   * we will find out if the remote end goes away.
+   */
+  if ([newConn respondsToSelector: @selector(_enableKeepalive)])
+    {
+      [newConn _enableKeepalive];
+    }
   /*
    *	Create a new map table entry for this connection with a value that
    *	is a table (normally with a single entry) containing registered