gevent.wait(): fix leak of a timer

- test__greenlet.py: add TestJoinAll0

gevent/hub.py

@@ -618,7 +618,8 @@ def iwait(objects, timeout=None):
     waiter = Waiter()
     switch = waiter.switch
     if timeout is not None:
-        get_hub().loop.timer(timeout, priority=-1, ref=False).start(waiter.switch, _NONE)
+        timer = get_hub().loop.timer(timeout, priority=-1)
+        timer.start(waiter.switch, _NONE)
     try:
         count = len(objects)
         for obj in objects:
@@ -630,6 +631,8 @@ def iwait(objects, timeout=None):
                 return
             yield item
     finally:
+        if timeout is not None:
+            timer.stop()
         for obj in objects:
             obj.unlink(switch)
 

greentest/test__greenlet.py

@@ -433,6 +433,14 @@ class TestGet(greentest.GenericGetTestCase):
             g.kill()
 
 
+class TestJoinAll0(greentest.GenericWaitTestCase):
+
+    g = gevent.Greenlet()
+
+    def wait(self, timeout):
+        gevent.joinall([self.g], timeout=timeout)
+
+
 class TestJoinAll(greentest.GenericWaitTestCase):
 
     def wait(self, timeout):