A bit confused with the sched_4bsd.c code

[gerarra at tin.it]

>Halil Demirezen wrote:
>> Hello,
>> 
>> First of all, I am not sure if this is the correct mail list with posting
>this 
>> mail. I apologize for that.. Second, I may seem to have little 
>> C knowledge, though I am using C for about 5 years and plus.
>> 
>> Let's start with the question. I am digging the FreeBSD-5.3 kernel codes.
>> Watson's Cross Reference is really helpful. In the schedcpu(void) function
>> there is an assignment like "ke = td->td_kse;" on line 438  (see: 
>> http://fxr.watson.org/fxr/source/kern/sched_4bsd.c?v=RELENG53#L438").
>> When I look at the thread structure at sys/proc.h, I could not see such
>an
>> entry td_kse in the "thread" structure. How has this structure been extended
>
>> or this entry added to the thread structure?
>> 
>> Although the kernel codes seem to be simply understandable, there still
>lies
>> some difficulties to understand for an average C programmer: magic stuff
>done
>> by professionals. :)
>> 
>> Anyway, any help really will be appreciated...
>> 
>> Thanks.
>
>Look near the top of the file for:
>
>#define td_kse td_sched
>
>That makes td->td_kse resolve to td->td_sched.  Now, there is
>other magic associated with td_sched in each scheduler source
>file, but that's different matter =-)

If you *really* want to dig inside sources remind that grep is your friend

rookie