Jeff Weber wrote:
> On Wed, Mar 30, 2011 at 5:00 PM, Gilles Chanteperdrix <
> [email protected]> wrote:
>
>> Jeff Weber wrote:
>>> On Wed, Mar 23, 2011 at 2:37 AM, Gilles Chanteperdrix <
>>> [email protected]> wrote:
>>>
>>>> Jeff Weber wrote:
>>>>> I need to timetag events from a realtime context with a
>> NPT-synchronized
>>>>> system clock. This topic comes up periodically on the mailing list.
>>>> Last I
>>>>> recall, there was talk of adding the capability via an alternate
>>>>> (non-CLOCK_REALTIME) clock_id. What is the status of this topic?
>>>> The CLOCK_HOST_REALTIME is available in the xenomai-head branch (to be
>>>> 2.6 branch, soon). It requires modifications of the I-pipe patch which
>>>> are available, at least, on x86, but are probably not really hard to
>>>> implement on other platforms.
>>>>
>>> clock_gettime(CLOCK_HOST_REALTIME) fails when called from kernel, and
>> from
>>> clocktest. Any ideas why?
>>> Does the CLOCK_HOST_REALTIME need to be initialized in some way?
>>> Test and config follow.
It definitely works here with clocktest. I get, for instance:
# clocktest -C 42 -D
hostrt data area is live
Sequence counter : 66552
wall_time_sec : 1301523397
wall_time_nsec : 660000002
wall_to_monotonic
tv_sec : -1301523264
tv_nsec : 785932050
cycle_last : 465912010644
mask : 0xffffffffffffffff
mult : 1345300900
shift : 31
== Tested clock: 42 (CLOCK_HOST_REALTIME)
CPU ToD offset [us] ToD drift [us/s] warps max delta [us]
--- -------------------- ---------------- ---------- --------------
0 1.2 -0.001 0 0.0
1 1.4 0.002 0 0.0
^C
--
Gilles.
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