Mailing List Archive: hrtimer.h

hrtimer.h

Nov 29, 2006, 4:42 PM

Post #1 of 3 (496 views)

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 [ In reply to ]

arjan at infradead

Nov 30, 2006, 4:06 AM

Post #2 of 3 (498 views)

Permalink

On Thu, 2006-11-30 at 01:42 +0100, Ariel ChÃ¿ffffe1vez 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!

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Re: hrtimer.h [ In reply to ]

rostedt at goodmis

Dec 13, 2006, 5:09 PM

Post #3 of 3 (489 views)

Permalink

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

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