[issue27749] multprocessing errors on Windows: WriteFile() argument 1 must be int, not None; OSError: handle is closed

[Michael Jacob]

Michael Jacob <ja...@j-e-b.net> added the comment:

So, I'm experiencing the issue in the title, too. The pipe handle stays valid 
for between 5 and 60 minutes, then it goes None when written to.

I'm far from understanding that code, but this crude re-connect code seems to 
solve the issue for me:

In BaseProxy._callmethod, I changed:

        conn.send((self._id, methodname, args, kwds))

to:

        try:
            conn.send((self._id, methodname, args, kwds))
        except TypeError:
            self._connect()
            conn = self._tls.connection
            conn.send((self._id, methodname, args, kwds))

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<https://bugs.python.org/issue27749>
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