[Python-Dev] Should asyncio ignore KeyboardInterrupt?

[Andrew Svetlov]

I believe it's a bug #23057 http://bugs.python.org/issue23057

On Sat, Jul 4, 2015 at 10:58 PM, Guido van Rossum <guido at python.org> wrote:
> It's possible, but AFAIK asyncio.sleep() has nothing in common with
> time.sleep() -- it's implemented as a timeout on select() or on the IOCP
> loop. (I also have no access to Windows ATM.)
>
> On Sat, Jul 4, 2015 at 7:49 PM, R. David Murray <rdmurray at bitdance.com>
> wrote:
>>
>> Once long ago in Internet time (issue 581232) time.sleep on windows was
>> not interruptible and this was fixed.  Is it possible the work on EINTR
>> has broken that fix?
>>
>> (I don't currently have 3.5 installed on windows to test that theory...)
>>
>> On Sat, 04 Jul 2015 17:46:34 +0200, Guido van Rossum <guido at python.org>
>> wrote:
>> > I think this may be more of a Windows issue than an asyncio issue. I
>> > agree
>> > that ideally ^C should take effect immediately (as it does on UNIX).
>> >
>> > On Sat, Jul 4, 2015 at 9:54 AM, Terry Reedy <tjreedy at udel.edu> wrote:
>> >
>> > > Should the loop.run... methods of asyncio respect KeyboardInterrupt
>> > > (^C)?
>> > >
>> > > Developer and user convenience and this paragraph in PEP
>> > >
>> > > "However, exceptions deriving only from BaseException are typically
>> > > not
>> > > caught, and will usually cause the program to terminate with a
>> > > traceback.
>> > > In some cases they are caught and re-raised. (Examples of this
>> > > category
>> > > include KeyboardInterrupt and SystemExit ; it is usually unwise to
>> > > treat
>> > > these the same as most other exceptions.) "
>> > >
>> > > and this examples in the doc (two places)
>> > >
>> > > TCP echo server
>> > >     # Serve requests until CTRL+c is pressed
>> > >     print('Serving on {}'.format(server.sockets[0].getsockname()))
>> > >     try:
>> > >         loop.run_forever()
>> > >     except KeyboardInterrupt:
>> > >         pass
>> > >
>> > > suggest yes.  On the other hand, the section on
>> > > "Set signal handlers for SIGINT and SIGTERM"
>> > > suggests not, unless an explicit handler is registered and then only
>> > > on
>> > > Unix.
>> > >
>> > > In any case, Adam Bartos, python-list, "An asyncio example", today
>> > > asks.
>> > > '''
>> > > This is a minimal example:
>> > >
>> > > import asyncio
>> > >
>> > > async def wait():
>> > >     await asyncio.sleep(5)
>> > >
>> > > loop = asyncio.get_event_loop()
>> > > loop.run_until_complete(wait())
>> > >
>> > > Ctrl-C doesn't interrupt the waiting, instead KeyboardInterrupt occurs
>> > > after those five seconds. It's 3.5.0b2 on Windows. Is it a bug?
>> > > '''
>> > >
>> > > Using run_forever instead, I found no way to stop other than killing
>> > > the
>> > > process (Idle or Command Prompt).
>> > >
>> > > --
>> > > Terry Jan Reedy
>> > >
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>> >
>> >
>> >
>> > --
>> > --Guido van Rossum (python.org/~guido)
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>
>
>
> --
> --Guido van Rossum (python.org/~guido)
>
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-- 
Thanks,
Andrew Svetlov