public static extern int clock_gettime(
[In] clockid_t clock_id,
[Out] out timespec tp
);
public static extern int clock_settime(
[In] clockid_t clock_id,
[In] ref /* readonly */ timespec tp
);
public static extern int clock_getres(
[In] clockid_t clock_id,
[Out] out timespec res
);
