[Python-Dev] Poking about issue 1677

[Tim Golden]

On 26/06/2012 11:59, Tim Golden wrote:
> On 26/06/2012 11:51, Devin Jeanpierre wrote:
>> Hi guys,
>>
>> I just wanted to bring some more attention to issue #1677 , because I
>> feel it's important and misunderstood. See:
>> http://bugs.python.org/issue1677
>>
>> The issue is that sometimes, if you press ctrl-c on Windows, instead
>> of raising a KeyboardInterrupt, Python will exit completely. Because
>> of this, any program that relies on ctrl-c/KeyboardInterrupt is not
>> guaranteed to work on windows. Also, working with the interactive
>> interpreter becomes really annoying for those with the habit of
>> deleting the whole input line via ctrl-c.
>>
>> Some people that read the bug report think that this only happens if
>> you hold down ctrl-c long enough or fast enough or some such thing.
>> That's not so; it can happen just from pressing ctrl-c once. Whatever
>> race condition here is not related to the timing gaps between presses
>> of ctrl-c. The "test cases" of "hold down ctrl-c for a bit" are to
>> conveniently reproduce, not a description of the problem.
>>
>> Hope this was the right place. #python-dev encouraged me to post here,
>> so, yeah. And thanks for all your hard work making Python a pleasant
>> place to be. :)
> 
> Thanks, Devin. Definitely useful info. AFAICT you haven't added that
> particular snippet of info to the call. (ie the fact that even one press
> will trigger the issue). Please feel free to add; I notice that you're
> the last submitter, some time last year.
> 
> Goodness knows if I'll get the time, but the
> natural thing would be to hunt down the uses of SetConsoleCtrlHandler to
> see what we're doing with them.

OK. We clearly *don't* set a console handler as I thought
we did. Scratch that idea off the list. As Martin said:
need to run this with a debugger attached to try to catch
in action.

TJG