[MERGE] Fix for running parallel tests on Mac OS X

[Robert Collins]

On Wed, 2009-06-03 at 06:13 -0400, John Szakmeister wrote:
> +    except Exception, e:
> +        pass 

This is faulty - it will hit ctrl-C. At minium you could fix it by doing
except (KeyboardInterrupt, SystemExit):
    raise
except Exception:
    pass

but better still would be to catch something more specific, like
IOError.

bb:resubmit

-Rob
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