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Date: Wed, 03 Dec 2008 11:46:35 +0100
From: Wolfgang Grandegger <wg@domain.hid>
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Subject: Re: [Xenomai-help] pthread cancelation and scheduling magics
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-help <xenomai@xenomai.org>

Gilles Chanteperdrix wrote:
> Wolfgang Grandegger wrote:
>> Gilles Chanteperdrix wrote:
>>> For architectures with a high-resolution counter,
>>> clock_gettime(CLOCK_MONOTONIC) is a xenomai service which uses the
>>> counter and does not issue any syscall, this includes arm unless you
>>> configured xenomai with --enable-arm-arch=generic or with
>>> --disable-arm-tsc, and this probably includes powerpc.
>>>
>> clock_gettime() is wrapped to __wrap_clock_gettime(), which does a syscall:
>>
>> http://www.rts.uni-hannover.de/xenomai/lxr/source/src/skins/posix/clock.c?v=SVN-trunk#058
>>
>> Have I missed something?
> 
> Yes, read the code again.

I was aware of CONFIG_XENO_HW_DIRECT_TSC but didn't look it up correctly
:-(. It is set for my ARM  but not for my PowerPC system. Which explains
some differences.

Wolfgang.