[svn r45548] - refactoring cleanup mechanics into its own class

- have setDaemon(1) for the receiverThread as
  otherwise on python2.5 atexit will not be invoked
  (the receiver thread apparently blocks it)

--HG--
branch : trunk

py/execnet/gateway.py

@@ -28,30 +28,55 @@ debug = 0 # open('/tmp/execnet-debug-%d' % os.getpid()  , 'wa')
 
 sysex = (KeyboardInterrupt, SystemExit)
 
+# ----------------------------------------------------------
+# cleanup machinery (for exiting processes) 
+# ----------------------------------------------------------
+
+class GatewayCleanup:
+    def __init__(self): 
+        self._activegateways = weakref.WeakKeyDictionary()
+        atexit.register(self.cleanup_atexit)
+
+    def register(self, gateway):
+        assert gateway not in self._activegateways
+        self._activegateways[gateway] = True
+
+    def unregister(self, gateway):
+        del self._activegateways[gateway]
+
+    def cleanup_atexit(self):
+        if debug:
+            print >>debug, "="*20 + "cleaning up" + "=" * 20
+            debug.flush()
+        for gw in self._activegateways.keys():
+            gw.exit()
+            gw.join() # should work as well
+
+# ----------------------------------------------------------
+# Base Gateway (used for both remote and local side) 
+# ----------------------------------------------------------
+
 class Gateway(object):
     class _StopExecLoop(Exception): pass
     _ThreadOut = ThreadOut 
     remoteaddress = ""
     _requestqueue = None
+    _cleanup = GatewayCleanup()
 
     def __init__(self, io, _startcount=2): 
         """ initialize core gateway, using the given 
             inputoutput object. 
         """
-        global registered_cleanup, _activegateways
         self._io = io
         self._channelfactory = ChannelFactory(self, _startcount)
-        if not registered_cleanup:
-            atexit.register(cleanup_atexit)
-            registered_cleanup = True
-        _activegateways[self] = True
+        self._cleanup.register(self) 
 
     def _initreceive(self, requestqueue=False):
         if requestqueue: 
             self._requestqueue = Queue.Queue()
         self._receiverthread = threading.Thread(name="receiver", 
                                  target=self._thread_receiver)
-        self._receiverthread.setDaemon(0)
+        self._receiverthread.setDaemon(1)
         self._receiverthread.start() 
 
     def __repr__(self):
@@ -296,6 +321,7 @@ class Gateway(object):
 
     def exit(self):
         """ Try to stop all exec and IO activity. """
+        self._cleanup.unregister(self)
         self._stopexec()
         self._stopsend()
 
@@ -323,13 +349,3 @@ def getid(gw, cache={}):
         cache[name][id(gw)] = x = "%s:%s.%d" %(os.getpid(), gw.__class__.__name__, len(cache[name]))
         return x
 
-registered_cleanup = False
-_activegateways = weakref.WeakKeyDictionary()
-def cleanup_atexit():
-    if debug:
-        print >>debug, "="*20 + "cleaning up" + "=" * 20
-        debug.flush()
-    while _activegateways:
-        gw, ignored = _activegateways.popitem()
-        gw.exit()
-        #gw.join() should work as well