add is_running to get callback state

diff --git a/tornado/ioloop.py b/tornado/ioloop.py
index 03193865bc0c811e089068ca352b33bbf7720c85..52b73ad5bf504aa834c9d81417de2aed40466e90 100644 (file)
--- a/tornado/ioloop.py
+++ b/tornado/ioloop.py
@@ -969,6 +969,9 @@ class PeriodicCallback(object):
             self.io_loop.remove_timeout(self._timeout)
             self._timeout = None
 
+    def is_running(self):
+        return self._running
+
     def _run(self):
         if not self._running:
             return