linux-kernel - Re: Man page for revised timerfd API

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Message-ID: <Pine.LNX.4.64.0709270944300.763@alien.or.mcafeemobile.com>
Date:	Thu, 27 Sep 2007 09:45:34 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Michael Kerrisk <mtk-manpages@....net>
cc:	rdunlap@...otime.net, Andrew Morton <akpm@...ux-foundation.org>,
	hch@....de, geoff@...are.org.uk, tglx@...utronix.de,
	david@...deman.nu, Ulrich Drepper <drepper@...hat.com>,
	subrata@...ux.vnet.ibm.com, corbet@....net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Man page for revised timerfd API

On Thu, 27 Sep 2007, Michael Kerrisk wrote:

> Davide,
> 
> A further question: what is the expected behavior in the
> following scenario:
> 
> 1. Create a timerfd and arm it.
> 2. Wait until M timer expirations have occurred
> 3. Modify the settings of the timer
> 4. Wait for N further timer expirations have occurred
> 5. read() from the timerfd
> 
> Does the buffer returned by the read() contain the value
> N or (M+N)?  In other words, should modifying the timer
> settings reset the expiration count to zero?

Every timerfd_settime() zeroes the tick counter. So in your scenario it'll 
return N.



- Davide


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