Set PeriodicCallback._running to True in start instead of __init__

Closes #72.

diff --git a/tornado/ioloop.py b/tornado/ioloop.py
index 63b4e3e65b2f50a50a828debec0e4ba3b0bbc0c2..d414b4f199805962682baded5ce13bb9806e2ee3 100644 (file)
--- a/tornado/ioloop.py
+++ b/tornado/ioloop.py
@@ -370,9 +370,10 @@ class PeriodicCallback(object):
         self.callback = callback
         self.callback_time = callback_time
         self.io_loop = io_loop or IOLoop.instance()
-        self._running = True
+        self._running = False
 
     def start(self):
+        self._running = True
         timeout = time.time() + self.callback_time / 1000.0
         self.io_loop.add_timeout(timeout, self._run)