[issue14440] Close background process if IDLE closes abnormally.

[Roger Serwy]

Roger Serwy <roger.serwy at gmail.com> added the comment:

This bug is related to issue12540. The approach taken there is to have the IDLE frontend explicitly kill the subprocess. It's a band-aid to the problem that run.py doesn't exit when the socket to the IDLE frontend closes (either by shell restart or kill -9 on IDLE).

Attached is a patch to cause the subprocess to exit. I have to admit not fully understanding why it works (on Ubuntu 11.04).

It looks like the following code in _getresponse() in rpc.py is what keeps the subprocess running:

    cvar.acquire()
    while myseq not in self.responses:
        cvar.wait()

I also tried disabling the "terminate_subprocess" in PyShell.py. With that change, the subprocess does not terminate on a shell restart (unless my patch is applied). 

Andrew, Terry: What are your thoughts?

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keywords: +patch
Added file: http://bugs.python.org/file25105/issue14440.patch

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