Changed the way that the storage is closed. Our close method may be

called from a separate thread than the async main loop. We only want
the async main loop to close our _call (rpc) object. Instead of
closing it directly, we call closeIntensionally(), which, in return,
requests that the async main loop closes it, via the select trigger.

src/ZEO/zrpc.py

@@ -85,7 +85,7 @@
 """Simple rpc mechanisms
 """
 
-__version__ = "$Revision: 1.6 $"[11:-2]
+__version__ = "$Revision: 1.7 $"[11:-2]
 
 from cPickle import loads
 from thread import allocate_lock
@@ -241,6 +241,11 @@ class asyncRPC(SizedMessageAsyncConnection):
         self.__la()
         return self.__r
 
+    def closeIntensionally(self):
+        if self.__map:
+            self.__Wakeup(lambda self=self: self.close()) # You dumb bastard
+        else: self.close()
+        
     def close(self):
         asyncRPC.inheritedAttribute('close')(self)
         self.aq_parent.notifyDisconnected(self)