[PATCH v2 5/8] kernel32: Implement GetSystemTimeAsFileTime() directly.

[Alexandre Julliard]

Huw Davies <huw at codeweavers.com> writes:

> @@ -764,7 +768,38 @@ void WINAPI GetSystemTimeAsFileTime( FILETIME *time )
>  {
>      LARGE_INTEGER t;
>  
> -    NtQuerySystemTime( &t );
> +#ifdef HAVE_CLOCK_GETTIME
> +    struct timespec ts;
> +    static clockid_t clock_id = CLOCK_MONOTONIC; /* placeholder */
> +
> +    if (clock_id == CLOCK_MONOTONIC)
> +    {
> +#ifdef CLOCK_REALTIME_COARSE
> +        struct timespec res;
> +
> +        /* Use CLOCK_REALTIME_COARSE if it has 1 ms or better resolution */
> +        if (!clock_getres( CLOCK_REALTIME_COARSE, &res ) && res.tv_sec == 0 && res.tv_nsec <= 1000000)
> +            clock_id = CLOCK_REALTIME_COARSE;
> +        else
> +#endif /* CLOCK_REALTIME_COARSE */
> +            clock_id = CLOCK_REALTIME;
> +    }
> +
> +    if (!clock_gettime( clock_id, &ts ))
> +    {
> +        t.QuadPart = ts.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
> +        t.QuadPart += (ts.tv_nsec + 50) / 100;
> +    }
> +    else
> +#endif /* HAVE_CLOCK_GETTIME */
> +    {
> +        struct timeval now;
> +
> +        gettimeofday( &now, 0 );
> +        t.QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
> +        t.QuadPart += now.tv_usec * 10;
> +    }
> +

Do we really need to duplicate the entire thing?

If the extra call to ntdll is really that expensive, you could probably
forward to it instead.

-- 
Alexandre Julliard
julliard at winehq.org