From: Colin Walters <walters@verbum.org>
To: Bob Richmond <bob@lorez.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Real time clock update notification
Date: Sat, 28 Jan 2012 09:26:54 -0500 [thread overview]
Message-ID: <1327760814.5816.1.camel@lenny> (raw)
In-Reply-To: <4F232AA4.5070208@lorez.org>
On Fri, 2012-01-27 at 14:52 -0800, Bob Richmond wrote:
> Is there any kind of facility for a process that is blocking in any one
> of the event notification system calls (select/poll/epoll_wait) to be
> unblocked in the event that the realtime clock has been updated? For
> instance, say I want to fire off an event at the exact moment that the
> realtime clock flips to 2pm. I first query the realtime clock via
> clock_gettime(CLOCK_REALTIME), and know that in 3 hours, it will be 2pm
> and I want to unblock at that moment. So I block in epoll_wait for 3 hours.
You're looking for "timerfd". Our use in GNOME is here:
http://git.gnome.org/browse/gnome-desktop/tree/libgnome-desktop/gnome-datetime-source.c
prev parent reply other threads:[~2012-01-28 14:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-27 22:52 Bob Richmond
2012-01-28 14:26 ` Colin Walters [this message]
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