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From: Marko Rauhamaa <marko@pacujo.net>
Newsgroups: comp.lang.python
Subject: Re: cross platform alternative for signal.SIGALRM?
Date: Thu, 12 Nov 2015 10:15:48 +0200
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Ulli Horlacher <framstag@rus.uni-stuttgart.de>:

> Marko Rauhamaa <marko@pacujo.net> wrote:
>
>> I'm thinking the only portable way is to run a watchdog process with
>> subprocess or multiprocessing.
>
> How can a subprocess interrupt a function in another process?
>
> For example: waiting for user input with a timeout.
>
> raw_input("Hit ENTER to continue or wait 10 s")

By sending the parent a signal with os.kill().

Now, signal handling in Python is brittle so you must be careful:

  There is no way to “block” signals temporarily from critical sections
  <URL: https://docs.python.org/2/library/signal.html>


Marko