Fix _ProactorWritePipeTransport._pipe_closed()

vstinner · vstinner · commit 35db74fd502e · 2014-02-04T08:54:49.000+01:00
Do nothing if the pipe is already closed. _loop_writing() may call
_force_close() when it gets ConnectionResetError.
diff --git a/asyncio/proactor_events.py b/asyncio/proactor_events.py
@@ -304,9 +304,12 @@ def _pipe_closed(self, fut):
         if fut.cancelled():
             # the transport has been closed
             return
+        assert fut.result() == b''
+        if self._closing:
+            assert self._read_fut is None
+            return
         assert fut is self._read_fut, (fut, self._read_fut)
         self._read_fut = None
-        assert fut.result() == b''
         if self._write_fut is not None:
             self._force_close(exc)
         else:
