Why I can't get the seconds and nanoseconds like this?

[Nicholas Mc Guire]

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> Hi:
> 	I wrote the simple application like this.
>
> #include <stdio.h>
> #include <l4/util/rdtsc.h>
> #include <l4/sys/l4int.h>
> #include <l4/thread/thread.h>
>
> char LOG_tag[4]="clk";
>
> int main(void)
> {
>        l4_uint32_t     *second;
>        l4_uint32_t     *nanosecond;
>        l4_cpu_time_t   tsc;
>        tsc = l4_rdtsc();
>        l4_tsc_to_s_and_ns(tsc, second, nanosecond);
>        printf("%d, %d \n", *second, *nanosecond);
> }
>
> The result is :
> clk     | 0, 0
> clk     |
> clk     | Exiting with 6
>
> 	Does these code have some problems?
> 	Thank you.
> 															cheng
did you ever initialize the tsc scallare ? it depends on your 
configuration - it is not necessarily done automatically - you could check
if thats the problem first by simply printing the tsc value it self (as 64
bit value) and if that is non-0 (as to be expected) then the 
initialization is most likely the problem. to initialized the scalar you 
use:

    l4_uint32_t  l4_tsc_init (int constraint)

Initialize the scalers needed by l4_tsc_to_ns()/l4_ns_to_tsc() and CPU ticks

see:

  http://os.inf.tu-dresden.de/l4env/doc/html/l4util/group__rdtsc.html#ga8

for a bit more details

other than that I don't see a prblem
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