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From: "mark manning" <mark.manning@fastermail.com>
To: linux-kernel@vger.kernel.org
Date: Tue, 09 Apr 2002 23:42:43 -0500
Subject: Re: nanosleep
Sender: linux-kernel-owner@vger.kernel.org


thanx - how much of a difference should i expect - i know the syscall is asking for at least the required ammount but that the task switcher might not give me control back for a while after the requested delay but i was expecting to be a little closer to what i had asked for - this isnt critical of corse but i would like to know what to expect.


----- Original Message -----
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Tue, 09 Apr 2002 21:17:03 -0700
To: mark manning <mark.manning@fastermail.com>
Subject: Re: nanosleep


> mark manning wrote:
> > doh - i think something is still wrong, i ask for 1000 ms and i get a second but if i do a 500 itteration loop asking for 1 ms i get 5 seconds.  i am also starting to distrust my elapsed time display which is using the gettimeofday syscall
> > 
> 
> It doesn't work that way.  Each call to nanosleep() gives you a 
> *MINIMUM* time to delay.  The kernel may decide to schedule you away and 
> pick your process up when it suits it.
> 
> 	-hpa
> 
> 
> 

-- 

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