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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Please help with Threading
Date: Sun, 19 May 2013 22:58:45 -0400
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On Mon, 20 May 2013 07:52:23 +1000, Chris Angelico <rosuav@gmail.com>
declaimed the following in gmane.comp.python.general:

> Incidentally, is the context-switch check the same as the check for
> interrupt signal raising KeyboardInterrupt? ISTR that was another
> "every N instructions" check.
>
	That I couldn't say -- it would be the obvious spot for the
interpreter to check some global flag, said flag perhaps being set by an
interrupt handler, signal bits, or whatever the underlying OS uses.

	OTOH, KeyboardInterrupt may be something passed up through the I/O
system and only checked when a thread performs I/O on stdin (which would
explain how number crunchers can be "unstoppable"). And in this case,
the invocation of the I/O triggers a context switch.

-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/