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Date:      Fri, 3 May 2002 13:00:31 +0100
From:      Dominic Marks <dominic_marks@btinternet.com>
To:        Paolo Di Francesco <paipai@tin.it>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: A time resolution problem
Message-ID:  <20020503130031.A790@host217-39-140-82.in-addr.btope>
In-Reply-To: <3CD29602.24230.34C2C21@localhost>; from paipai@tin.it on Fri, May 03, 2002 at 01:52:02PM %2B0200
References:  <3CD29602.24230.34C2C21@localhost>

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On Fri, May 03, 2002 at 01:52:02PM +0200, Paolo Di Francesco wrote:
> Hello hackers,
> 
> I am trying to write a simple C program that must do some 
> specialized things. The idea is that the program must send 
> packets each T seconds. Ok, I know.. use the sleep, microsleep 
> things, and it works pretty well if the interval is greater than 
> 1 msec. (recompiled the kernel with HZ=100000)
> 
> Now the problem is that I want to know if it is possible, and 
> how, to schedule events with a precision greater (or equal to)) 
> than 1ms. Maybe an approach with posix timers? Maybe move the app 
> into the kernel space? Maybe change the scheduler?

KEvent has EVFILT_TIMER to allow you to return after a period. It
takes a struct timespec as its argument, which goes down to nanosecond
resolution. If it is practically useful at such small intervals I do
not know, but its possibly in theory.

> any idea, even the most exotic ones, appreciated!
> 
> --
> 
> Ciao Ciao
> 
>    _
>  ->B<-   All Recycled Bytes Message ...
>    ~
> 
> 
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-- 
Dominic

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