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From: John Baldwin <jhb@freebsd.org>
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	(bigwig.baldwin.cx); Mon, 12 Sep 2011 08:19:05 -0400 (EDT)
Cc: Filippo Sironi <filippo.sironi@gmail.com>,
	Riccardo Cattaneo <cattaneo.riccardo@gmail.com>
Subject: Re: Kernel timers infrastructure
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On Monday, September 12, 2011 4:42:40 am Filippo Sironi wrote:
> This is what I wrote for FreeBSD 7.2 and it does not work:

callout_reset() is always going to return false here as you are never 
rescheduling an existing callout (it is either idle or has already fired each 
time you invoke callout_reset()).

However, you are calling uprintf() from the kernel softclock thread and that 
thread is not attached to your tty, so the uprintf() is going to nowhere.

Just use a regular printf and you will get your "Hello, World!" output once a 
second.

-- 
John Baldwin