select: detect invalid switch with assert as wait_reader and wait_writer do

4d4f45d5 · Denis Bilenko · 6233a838 · 4d4f45d5
Commit 4d4f45d5 authored Jul 20, 2009 by Denis Bilenko
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Showing with 2 additions and 3 deletions

gevent/select.py gevent/select.py +2 -3

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--- a/gevent/select.py
+++ b/gevent/select.py
@@ -38,9 +38,8 @@ def select(read_list, write_list, error_list, t=None):
            result = hub.switch()
        except greenlet.TimeoutError:
            return [], [], []
-        if hasattr(result, '__len__') and len(result)==3:
+        assert hasattr(result, '__len__') and len(result)==3, "Invalid switch into select: %r" % (result, )
-            return result
+        return result
-        raise RuntimeError("Invalid switch into select: %r" % (result, ))
    finally:
        for evt in allevents:
            evt.cancel()