Re: [PATCH V8 08/13] posix clocks: cleanup the CLOCK_DISPTACH macro

Richard Cochran
2011-01-13T04:30:45Z

On Tue, Jan 11, 2011 at 01:57:23PM +0100, Thomas Gleixner wrote:
>
> static clockid_t clock_get_array_id(const clockid_t id)
> {
> if (id >= 0)
> return id < MAX_CLOCKS ? id : POSIX_INV_CLOCK_ID;
>
> if (clock_is_posix_cpu(id))
> return POSIX_CPU_CLOCK_ID;
>
> return POSIX_INV_CLOCK_ID;
> }
>
> static inline int dispatch_clock_getres(const clockid_t id, struct timespec *ts)
> {
> struct k_clock *clk = &posix_clocks[clock_get_array_id(id)];
>
> return clk->clock_getres ? clk->clock_getres(id, ts) : -EINVAL;
> }

I would like to take this idea one step further, like so:

static struct k_clock *clockid_to_kclock(const clockid_t id)
{
if (id >= 0)
return id < MAX_CLOCKS ?
&posix_clocks[id] : &posix_clocks[POSIX_INV_CLOCK_ID];
...
}

SYSCALL( ... , const clockid_t id, struct timespec *ts)
{
struct k_clock *clk = clockid_to_kclock(id);

return clk->clock_getres ? clk->clock_getres(id, ts) : -EINVAL;
}

What do you think?

Thanks,

Richard