STINNER Victor <[email protected]> added the comment:
_ProactorReadPipeTransport.set_transport():
if self.is_reading():
# reset reading callback / buffers / self._read_fut
self.pause_reading()
self.resume_reading()
This method cancelled the pending overlapped WSARecv(), and then create a new
overlapped WSARecv().
Even after CancelIoEx(old overlapped), the IOCP loop still gets an event for
the completion of the recv. Problem: since the Python future is cancelled, the
even is ignored and so 176 bytes are lost.
I'm surprised that an overlapped WSARecv() cancelled by CancelIoEx() still
returns data when IOCP polls for events.
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Python tracker <[email protected]>
<https://bugs.python.org/issue33694>
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