[m-rev.] diff: Use gettimeofday() for Mercury's ThreadScope support.

[Julien Fischer]

On Wed, 20 Jun 2012, Paul Bone wrote:

> Index: runtime/mercury_threadscope.c
> ===================================================================
> RCS file: /home/mercury/mercury1/repository/mercury/runtime/mercury_threadscope.c,v
> retrieving revision 1.20
> diff -u -r1.20 mercury_threadscope.c
> --- runtime/mercury_threadscope.c	19 Jun 2012 11:08:16 -0000	1.20
> +++ runtime/mercury_threadscope.c	20 Jun 2012 12:59:41 -0000

> +static Time
> +gettimeofday_nsecs(void)
> +{
> +    struct timeval      tv;
> +
> +    if (0 != gettimeofday(&tv, NULL)) {
> +        perror("gettimeofday()");
> +        /*
> +        ** Return a stupid value generating an obviously bad logfile
> +        ** rather than crashing a program that may otherwise work.
> +        */
> +        return 0;
>     }
> +    return (Time)tv.tv_sec * 1000000000 +
> +            (Time)tv.tv_usec * 1000;
> }

The body of that function should be protected by

    #if defined(MR_HAVE_GETTIMEOFDAY)

(unless that is implied by the surrouding context.)

Julien.
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