Hub.cancel_wait: avoid scheduling a callback if not necessary

cc772a9c · Denis Bilenko · 2faec79f · cc772a9c
Commit cc772a9c authored Aug 29, 2011 by Denis Bilenko
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gevent/hub.py gevent/hub.py +2 -1

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--- a/gevent/hub.py
+++ b/gevent/hub.py
@@ -298,7 +298,8 @@ class Hub(greenlet):
            watcher.stop()
    def cancel_wait(self, watcher, error):
-        self.loop.run_callback(self._cancel_wait, watcher, error)
+        if watcher.callback is not None:
+            self.loop.run_callback(self._cancel_wait, watcher, error)
    def _cancel_wait(self, watcher, error):
        if watcher.active: