Re: [Patch, fortran] PR 53456 Improve time resolution on targets without gettimeofday

[Tobias Burnus <burnus at net-b dot de>]

Hi Janne,

On 05/23/2012 04:44 PM, Janne Blomqvist wrote:
> some targets such as VXWorks don't provide gettimeofday but do provide
> clock_gettime. The attached patch allows such targets to get better
> resolution for the DATE_AND_TIME (up to the 1 millisecond limit of the
> API) intrinsic than the 1 second resolution provided by the current
> fallback of using the C standard time().
>
> Ok for trunk? (Patch both inline below and as an attachment)

I concur and wrote essentially the same patch - except that I used a 
different condition (and forgot to change the comment):

+#elif defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_REALTIME) && 
!defined(HAVE_CLOCK_GETTIME_LIBRT)

I think in practice it shouldn't matter as librt* mostly affects GLIBC 
which has gettimeofday. Plus I believe CLOCK_REALTIME should be always 
available and only CLOCK_MONOTONIC is unimplemented on some systems 
(e.g. on VxWorks 5.5 but not on 6.x according to the documentation).

(* = In intrinsics/system_clock.c, weak refs are used for librt; for 
gf_gettime that's an overkill and a simple time() as fall back is 
sufficient.)

Okay with considering my preprocessor condition.

Tobias

PS: In Thunderbird, the attachment is shown as inline. Thus, from my 
side, it is sufficient to just keep the attachment.