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clock_delay_for_interval

In <kern/clock.h> it lists a prototype for this function:

extern void clock_delay_for_interval(
uint32_t interval,
uint32_t scale_factor);

I am attempting to use it in a kext like this:

clock_delay_for_interval(200, NSEC_PER_USEC);

The kext links against the kernel framework, yet when I try to load the kext
I get this message:

> kld(): Undefined symbols:
> _clock_delay_for_interval

I'm running on 10.2.6. The kext loaded fine before I added this call.
Anyone know why this symbol is missing?

I also noticed these functions:

> /*
> * Configure the clock system.
> */
> extern void clock_config(void);
> /*
> * Initialize the clock system.
> */
> extern void clock_init(void);
>
> /*
> * Initialize the clock ipc service facility.
> */
> extern void clock_service_create(void);
>

Do I need to do anything with these before I call
clock_delay_for_interval()?

Is there documentation around to explain kernel APIs? I looked in the
Kernel Programming docs, but they're pretty sparse. Other than poking
around in the sources to figure out these things, it seems like there's very
little information around. Maybe I just don't know where to look.


Thanks for any input,


Eric
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