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Re: cross platform alternative for signal.SIGALRM?

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From Terry Reedy <tjreedy@udel.edu>
Newsgroups comp.lang.python
Subject Re: cross platform alternative for signal.SIGALRM?
Date Wed, 11 Nov 2015 20:37:34 -0500
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On 11/11/2015 11:16 AM, Ulli Horlacher wrote:
> I am rewriting a Perl program into Python (2.7).

I recommend using 3.4+ if you possibly can.

> It must run on Linux and Windows.
> With Linux I have no problems, but Windows... :-(
>
> The current show stopper is signal.SIGALRM which is not available on
> Windows:

> Perl for Windows has had SIGALRM support (or some kind of emulation).
>
> Ok, I have to redesign this part of my code:
>
>    def timeout_handler(sig,frame):
>      raise ValueError("timeout!")
>
>    signal.signal(signal.SIGALRM,timeout_handler)
>
>    while True:
>      chunk = fileo.read(bs)
>      sock.sendall(chunk)
>      (...)
>
> What is the best practise for a cross platform timeout handler?

The cross-platform 3.4 asyncio module has some functions with timeouts.
(3.5 has new 'async' syntac which supposedly makes it easier to use.  I 
have not looked at this yet.)

For instance: coroutine asyncio.wait(futures, *, loop=None, 
timeout=None, return_when=ALL_COMPLETED)
     Wait for the Futures and coroutine objects given by the sequence 
futures to complete. Coroutines will be wrapped in Tasks. Returns two 
sets of Future: (done, pending).
...
Usage:
   done, pending = yield from asyncio.wait(fs)

I believe the backport on pypi.python.org, called tulip, works on 2.7.

In the example above, the read/send would be a task.  Wait on the task, 
and when it returns, cancel the task if in pending.


-- 
Terry Jan Reedy

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Thread

cross platform alternative for signal.SIGALRM? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2015-11-11 16:16 +0000
  Re: cross platform alternative for signal.SIGALRM? Marko Rauhamaa <marko@pacujo.net> - 2015-11-11 18:30 +0200
    Re: cross platform alternative for signal.SIGALRM? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2015-11-11 17:06 +0000
      Re: cross platform alternative for signal.SIGALRM? Marko Rauhamaa <marko@pacujo.net> - 2015-11-11 20:03 +0200
        Re: cross platform alternative for signal.SIGALRM? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2015-11-11 22:42 +0000
      Re: cross platform alternative for signal.SIGALRM? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-11-11 19:42 -0500
  Re: cross platform alternative for signal.SIGALRM? Terry Reedy <tjreedy@udel.edu> - 2015-11-11 20:37 -0500
    Re: cross platform alternative for signal.SIGALRM? Marko Rauhamaa <marko@pacujo.net> - 2015-11-12 08:14 +0200
      Re: cross platform alternative for signal.SIGALRM? Christian Gollwitzer <auriocus@gmx.de> - 2015-11-12 07:43 +0100
        Re: cross platform alternative for signal.SIGALRM? Chris Angelico <rosuav@gmail.com> - 2015-11-12 18:37 +1100
        Re: cross platform alternative for signal.SIGALRM? Terry Reedy <tjreedy@udel.edu> - 2015-11-12 05:15 -0500
        Re: cross platform alternative for signal.SIGALRM? Chris Angelico <rosuav@gmail.com> - 2015-11-12 22:38 +1100
        Re: cross platform alternative for signal.SIGALRM? Terry Reedy <tjreedy@udel.edu> - 2015-11-12 09:01 -0500
      Re: cross platform alternative for signal.SIGALRM? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2015-11-12 07:22 +0000
        Re: cross platform alternative for signal.SIGALRM? Marko Rauhamaa <marko@pacujo.net> - 2015-11-12 10:15 +0200
    Re: cross platform alternative for signal.SIGALRM? Ulli Horlacher <framstag@rus.uni-stuttgart.de> - 2015-11-12 06:58 +0000
  Re: cross platform alternative for signal.SIGALRM? Cameron Simpson <cs@zip.com.au> - 2015-11-12 16:20 +1100

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