resolve issue #56: service browser initialization race

herczy · herczy · commit 15670161c597 · 2016-05-30T12:42:08.000+02:00
diff --git a/zeroconf.py b/zeroconf.py
@@ -971,12 +971,12 @@ def __init__(self, zc, type_, handlers=None, listener=None):
         self.delay = _BROWSER_TIME
         self._handlers_to_call = []
 
+        self._service_state_changed = Signal()
+
         self.done = False
 
         self.zc.add_listener(self, DNSQuestion(self.type, _TYPE_PTR, _CLASS_IN))
 
-        self._service_state_changed = Signal()
-
         if hasattr(handlers, 'add_service'):
             listener = handlers
             handlers = None
