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From: Marko Rauhamaa <marko@pacujo.net>
Newsgroups: comp.lang.python
Subject: Re: cross platform alternative for signal.SIGALRM?
Date: Wed, 11 Nov 2015 20:03:12 +0200
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Ulli Horlacher <framstag@rus.uni-stuttgart.de>:

> Hmmm... not so simple for me. My test code:
>
> from time import *
> import threading
> import sys
>
> def hello(): 
> raise ValueError("hello!!!")
>
> t = threading.Timer(3.0,hello)
> t.start()
> try:
>   print "start"
>   sleep(5)
>   print "end"
> except ValueError as e:
>   print e.args[0]
>   sys.exit(1)

Correct. The timer callback function (hello) would be called in a
separate thread. An exception raised in one thread cannot be caught in
the main thread. In general, there is no way for a thread to interrupt a
sibling thread that is in a blocking function call.


Marko