hrtimer.h

hrtimer.h

[Ariel Chÿffffe1vez Lorenzo]

Hi,

Since the kernel 2.6.18 has incorporated the high
resolution timer itself, I'm trying to test it, but on
my GNU/Debian I can't figure out how to include
hrtimer.h, that is on /usr/src/linux/include/, the
headers.

I use the following command to try to compile it.

gcc -D__KERNEL__ -I /usr/src/linux/include ex.c


ex.c is just the inclusion of hrtimer.h

#include <linux/hrtimer.h>
int main()
{
 return 0;
}


and I get this:



In file included from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/asm/thread_info.h:16,
                 from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/linux/thread_info.h:21,
                 from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/linux/preempt.h:9,
                 from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/linux/spinlock.h:49,
                 from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/linux/seqlock.h:29,
                 from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/linux/time.h:7,
                 from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/linux/ktime.h:24,
                 from
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/linux/hrtimer.h:19,
                 from ex.c:1:
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/asm/processor.h:80:
error: ‘CONFIG_X86_L1_CACHE_SHIFT’ undeclared here
(not in a function)
/usr/src/linux-headers-2.6.18sbr-24-11-06/include/asm/processor.h:80:
error: requested alignment is not a constant


I will appreciate any hint.
Thanks in advance..

Ariel



		
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Re: hrtimer.h

[Arjan van de Ven]

On Thu, 2006-11-30 at 01:42 +0100, Ariel Chÿffffe1vez Lorenzo wrote:
> Hi,
> 
> Since the kernel 2.6.18 has incorporated the high
> resolution timer itself, I'm trying to test it, but on
> my GNU/Debian I can't figure out how to include
> hrtimer.h, that is on /usr/src/linux/include/, the
> headers.
> 
> I use the following command to try to compile it.
> 
> gcc -D__KERNEL__ -I /usr/src/linux/include ex.c


never use __KERNEL__ for userspace programs!

Re: hrtimer.h

[Steven Rostedt]

On Thu, 2006-11-30 at 01:42 +0100, Ariel Chÿffffe1vez Lorenzo wrote:
> Hi,
> 
> Since the kernel 2.6.18 has incorporated the high
> resolution timer itself, I'm trying to test it, but on
> my GNU/Debian I can't figure out how to include
> hrtimer.h, that is on /usr/src/linux/include/, the
> headers.
> 
> I use the following command to try to compile it.
> 
> gcc -D__KERNEL__ -I /usr/src/linux/include ex.c
> 
> 
> ex.c is just the inclusion of hrtimer.h
> 
> #include <linux/hrtimer.h>
> int main()
> {
>  return 0;
> }
> 

As stated, the kernel headers have nothing to do with user space code.

But I'll educate you a little more.

First, high resolution timers are not in 2.6.18.  The hrtimers are, but
the actual meat that makes them high resolution wont be in until
(hopefully) 2.6.20 (or perhaps a little later).

To use the high resolution timers (when they are in), you don't need to
do anything special.  nanosleep, and all the posix timers will get them
automatically.

-- Steve